Agilent N4385A/N4386A Distributed Temperature System User s Guide Agilent Technologies
Notices Agilent Technologies, Inc. 2006 No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws. Agilent Technologies Manufacturing GmbH & Co.KG Herrenberger Straße 130 71034 Böblingen, Germany. Manual Part Number N4385-90001 Edition Second Edition, March 2007 Subject Matter The material in this document is subject to change without notice. Agilent Technologies makes no warranty of any kind with regard to this printed material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. Printing History New editions are complete revisions of the guide reflecting alterations in the functionality of the instrument. Updates are occasionally made to the guide between editions. The date on the title page changes when an updated guide is published. To find out the current revision of the guide, or to purchase an updated guide, contact your Agilent Technologies representative. Warranty This Agilent Technologies instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment. During the warranty period, Agilent will, at its option, either repair or replace products that prove to be defective. For warranty service or repair, this product must be returned to a service facility designated by Agilent. Buyer shall prepay shipping charges to Agilent and Agilent shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to Agilent from another country. Agilent warrants that its software and firmware designated by Agilent for use with an instrument will execute its programming instructions when properly installed on that instrument. Agilent does not warrant that the operation of the instrument, software, or firmware will be uninterrupted or error free. Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance. No other warranty is expressed or implied. Agilent Technologies specifically disclaims the implied warranties of Merchantability and Fitness for a Particular Purpose. Exclusive Remedies The remedies provided herein are Buyer s sole and exclusive remedies. Agilent Technologies shall not be liable for any direct, indirect, special, incidental, or consequential damages whether based on contract, tort, or any other legal theory. Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products. For any assistance contact your nearest Agilent Technologies Sales and Service Office. Certification Agilent Technologies Inc. certifies that this product met its published specifications at the time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, NIST (formerly the United States National Bureau of Standards, NBS) to the extent allowed by the Institutes s calibration facility, and to the calibration facilities of other International Standards Organization members. ISO 9001 Certification Produced to ISO 9001 international quality system standard as part of our objective of continually increasing customer satisfaction through improved process control.
Getting Started 5 Introduction................................................................................ 6 Measurement Concepts...................................................................... 7 General Safety Considerations................................................................ 9 Safety symbols.......................................................................... 9 Instrument markings..................................................................... 10 Laser safety information................................................................. 12 Environmental information............................................................... 14 Setting Up the Distributed Temperature System................................................ 15 Setting up the hardware.................................................................. 15 Installing the software................................................................... 17 Connecting to the controlling PC.......................................................... 17 Distributed temperature system front and rear panels........................................ 20 Terminating the Sensor Fiber................................................................ 28 Connecting to the Output and Input Relays.................................................... 29 Making Measurements 31 Starting the Distributed Temperature System.................................................. 32 N4385A/86A DTS Performance Test........................................................ 33 Equipment required...................................................................... 33 Notes on using the test record............................................................ 34 Instrument specification................................................................. 34 Performance test........................................................................ 34 Test failure............................................................................. 34 Temperature resolution test.............................................................. 34 Troubleshooting and Maintenance 43 Cleaning.................................................................................. 44 Safety precautions...................................................................... 44 What do I need for proper cleaning?....................................................... 44 Preserving connectors................................................................... 45 Cleaning instrument housings............................................................ 45 Cleaning the optical connectors and adaptors............................................... 46 Replacing the Fuse......................................................................... 48 Checking the Operation of the Distributed Temperature System.................................. 49 Returning the Instrument for Service.......................................................... 50 Agilent N4385A/N4386A Distributed Temperature System 3
Agilent Technologies sales and service offices.............................................. 51 Phone or fax............................................................................ 51 Specifications and Regulatory Information 53 Definition of Terms......................................................................... 55 References............................................................................. 59 Angled Connector Specifications............................................................. 60 Specifications.............................................................................. 61 Warranted Specifications................................................................. 61 DTS typical performance specification..................................................... 61 Housing & Environmental conditions....................................................... 62 Supplementary information............................................................... 62 Declaration of Conformity................................................................... 64 Ordering Information 65 Ordering Information........................................................................ 66 Example instrument configuration......................................................... 66 Accessories............................................................................... 67 Accessories available from Pflitsch........................................................ 67 Accessories available from Diamond....................................................... 67 Index 69 4 Agilent N4385A/N4386A Distributed Temperature System
1 Getting Started Introduction........................................ 6 General Safety Considerations........................ 9 Setting Up the Distributed Temperature System........ 15 Distributed temperature system front and rear panels.. 20 Agilent N4385A/N4386A Distributed Temperature System 5
Getting Started Introduction The Agilent N4385A/N4386A Distributed Temperature System (DTS) addresses spatially distributed temperature sensing applications. The range of applications covers downhole performance monitoring of oil & gas wells; pipeline leakage detection; high power cable monitoring; and many more applications. The Agilent DTS offers a reliable and robust way to measure the temperature along the sensing fiber. NOTE To get the most performance out of your distributed temperature system, it is recommended that you read Measurement Concepts on page 7, and Chapter 2, Making Measurements. These chapters describe the different measurements, and the setup procedures. 6 Agilent N4385A/N4386A Distributed Temperature System
Getting Started Measurement Concepts Agilent s distributed measurement is based on the proven Raman-Optical Time-Domain-Reflectometry technique. An optical laser pulse propagating through the fiber gets scattered light back to the transmitting end, where it is analyzed. The intensity of the Raman scatter is a measure for the temperature along the fiber. The backscattered light is spread across a range of wavelengths. Some of these wavelengths are affected by temperature changes while others are immune. By very accurately measuring the difference in the signal intensity of the backscattered light an accurate temperature measurement can be made. The position of the temperature reading is determined by measuring the arrival timing of the returning light pulse similar to a radar echo showing the distance of a car or plane. Agilent N4385A/N4386A Distributed Temperature System 7
Getting Started The temperature resolution is dependent on several factors: Measurement time, spatial resolution, the length of the fiber and the loss of the fiber, splices or connectors. 8 Agilent N4385A/N4386A Distributed Temperature System
Getting Started General Safety Considerations Safety symbols This product has been designed and tested in accordance with the standards listed on the manufacturer s Declaration of Conformity, and has been supplied in a safe condition. The documentation contains information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition. CAUTION The caution sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or destruction of the product. Do not proceed beyond a caution sign until the indicated conditions are fully understood and met. WARNING The warning sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a warning sign until the indicated conditions are fully understood and met. Agilent N4385A/N4386A Distributed Temperature System 9
Getting Started Instrument markings The instruction manual symbol. The product is marked with this warning symbol when it is necessary for the user to refer to the instructions in the manual. In this case, this is to change the fuse. Please refer to Replacing the Fuse on page 48. The laser radiation symbol. This warning symbol is marked on products which have a laser output. The DC (direct current) symbol is used to indicate the input power connecting terminal. This symbol indicates the earth connecting terminal. The ON symbol is used to show that the power switch is in the on position, and the instrument is in operating mode. The stand-by symbol is used to show the power switch is in the stand-by position and the instrument is in stand-by mode. Conformity Marking of the European Union Conformity Mark of the Australian ACA for EMC compliance, including Agilent Technologies Registration Number. General Recycling Mark for plastic parts used in the product WARNING If this product is not used as specified, the protection provided by the equipment could be impaired. This product must be used in a normal condition (in which all means for protection are intact) only. WARNING Operator access to the inside of the instrument is limited to the procedures described in Setting Up the Distributed Temperature System on page 15. Other areas and parts inside the instrument are not for service by the operator. Refer servicing to qualified service personnel. 10 Agilent N4385A/N4386A Distributed Temperature System
Getting Started WARNING The recommended power supply is a Safety Class 1 Product (provided with protective earth). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor inside or outside of the instrument is likely to make the instrument dangerous. Intentional interruption is prohibited. WARNING To prevent electrical shock, disconnect the instrument from mains before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not open the card cage inside the DTS, or attempt to clean it internally. WARNING Using controls or adjustments or performing procedures other than those specified in the documentation supplied with your equipment can result in hazardous radiation exposure. CAUTION This product complies with Pollution Degree 2. CAUTION When installing the instrument using the recommended power supply, make sure the detachable power cord is readily identifiable and is easily reached by the operator. The detachable power cord is the instrument disconnecting device. It disconnects the mains circuit from the mains supply before other parts of the instrument. The front panel switch is only a standby switch and is not a LINE switch. Alternatively, an externally installed switch or circuit breaker (which is readily identifiable and is easily reached by the operator) may be used as a disconnecting device. CAUTION For operation of the instrument by external power, use Agilent AC/DC adaptor 0950-4250 (18V DC, 3.5 A). Operation is limited to indoor use, operation below 2000 m, and an operating temperature between 0 C to 50 C. For other operating conditions, please use an AC/DC adaptor that meets both the power and environmental requirements given in the specifications. Agilent does not offer suitable power supplies for conditions other than those given above. Agilent N4385A/N4386A Distributed Temperature System 11
Getting Started Laser safety information The laser source specified by this user guide is classified according to IEC 60825-1 (2001). The laser source complies with 21 CFR 1040.10 except for deviations pursuant to Laser Notice No. 50, dated 2001-July-26 N4385A/N4386A Laser type Wavelength Max. average output power a External Cavity Laser 1064 nm 17 mw Beam waist diameter 50 µm Numerical aperture 0.2 Laser class according to IEC 60825-1 (2001) Max. permissible average output power b 1M 20 mw a Max. average output power means the highest possible average power that the laser source can produce at its output. b Max. permissible average output power is the highest optical power that is permitted within the appropriate IEC laser class. A DTS emits repetitive pulse packages. According to the IEC 60825-1, the energy of these pulse packages is to be analyzed for all possible time spans. The result of this analysis is that the most critical case is the average power for the maximum time span of 100 s (time base). Laser class 1M label A sheet of laser safety labels is included with the laser module as required. In order to meet the requirements of IEC 60825-1 we recommend that you stick the laser safety labels, in your language, onto a suitable location on the outside of the instrument where they are clearly visible to anyone using the instrument. 12 Agilent N4385A/N4386A Distributed Temperature System
Getting Started The laser module has built-in safety circuitry which will disable the optical output in the case of a fault condition. WARNING Please pay attention to the following laser safety warnings: Under no circumstances look into the end of an optical cable attached to the optical output when the device is operational. The laser radiation can seriously damage your eyesight. The use of optical instruments with this product will increase the hazard to your eyes. Refer servicing only to qualified and authorized personnel. Agilent N4385A/N4386A Distributed Temperature System 13
Getting Started Environmental information This product complies with the WEEE Directive (2002/96/EC) marking requirements. The affixed label indicates that you must not discard this electrical/ electronic product in domestic household waste. Product Category: With reference to the equipment types in the WEEE Directive Annex I, this product is classed as a "Monitoring and Control instrumentation" product. Do not dispose in domestic household waste. To return unwanted products, contact your local Agilent office, or see www.agilent.com/environment/product/ for more information. 14 Agilent N4385A/N4386A Distributed Temperature System
Getting Started Setting Up the Distributed Temperature System Setting up the hardware 1 Unpack your shipment. a Inspect the shipping containers for damage. If the shipment was damaged, contact the carrier, then contact the nearest Agilent Technologies sales office. Keep the shipping containers and cushioning material until you have inspected the contents of the shipment for completeness and have checked the equipment mechanically and electrically. b Verify that you received the options and accessories that you ordered. The shipment should contain: The Distributed Temperature System instrument. This user guide CD ROM with the Agilent IO Libraries Suite, DTS Configurator (PC software), and further information, such as etrainings and programming examples. USB cable E2000 adapter Power adaptor Depending on the option you ordered, the shipment also includes: Agilent N4385A/N4386A Distributed Temperature System 15
Getting Started c Option A01: Power supply, with the appropriate adaptor cable and your local plug Option 050: A cable set with Two cables for the relay outputs One cable for the relay input Outdoor unit: Cable gland seals Inspect the instruments. If anything is missing or defective, contact your nearest Agilent Technologies sales office. WARNING To avoid the possibility of injury or death, you must observe the following precautions before switching on the instrument. Insert the power cable plug only into a socket outlet provided with a protective earth contact. Do not negate this protective action by the using an extension cord without a protective conductor. Do not interrupt the protective earth connection intentionally. Do not remove protective covers while the instrument is powered. Do not open the inner card cage. Component replacement and internal adjustments must be made only by qualified service personnel. Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel. Defective, damaged, or malfunctioning laser sources must be returned to an Agilent Technologies Service Center. Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard. CAUTION Before you connect any fiber-optic cable to the distributed temperature system, please ensure it has been properly cleaned. Fiber-optic connectors are easily damaged when connected to dirty or damaged cables and accessories. When you use improper cleaning and handling techniques, you risk expensive instrument repairs, damaged cables, and compromised measurements. 16 Agilent N4385A/N4386A Distributed Temperature System
Getting Started CAUTION If the device was stored outside the operating temperature range, first wait for the device to acclimatize before turning it on. Installing the software 2 Attach a power supply which provides the required safety extra-low voltage of 10 to 30 V (10 to 25V for operation above 2000 m). 3 For the N4385A, switch on the power. 1 On the PC you will be using to control the distributed temperature system, install the Agilent IO Libraries Suite from the CD supplied. 2 If you are using the DTS Configurator software to control the distributed temperature system, install this from the CD too. Connecting to the controlling PC 1 Connect the distributed temperature system to the controlling PC. NOTE When you connect a USB device, Windows will display a Found New Hardware Wizard. If your USB device is an Agilent USBTMC instrument or an Agilent USB/GPIB Interface Converter, you do not need to insert a CD when prompted by the wizard, because all the drivers you need have already been installed with the IO Libraries Suite. Simply click Next until the wizard completes. If a second Found New Hardware Wizard appears, continue to click Next until that wizard completes as well. These wizards place the installed USB drivers in the appropriate locations for Windows to recognize your device. If you are controlling the distributed temperature system over the LAN, you will need to first connect to the distributed temperature system via USB and set the IP address. The default settings are DHCP: enabled IP-address: 0.0.0.0 Host name: Domain name: A-N4385A-xxxxxx or A-N4386A-xxxxxx where xxxxxx denote the last 6 digits of the serial number The default domain name is an empty string. Agilent N4385A/N4386A Distributed Temperature System 17
Getting Started Subnet Mask: 255.255.255.0 Default Gateway: 0.0.0.0 To change these values: a Run Connection Expert: If the Connection Expert utility does not run automatically at this time, click the IO Control (IO icon in the Windows notification area) and then click Agilent Connection Expert. b Change the I/O configuration if necessary: Connection Expert will automatically detect most interfaces and instruments, and will assign names and other default configuration settings. If you want to change these parameters, you can do so in the Connection Expert window. i Select the instrument or interface in the explorer pane in the center of the Connection Expert window. ii The properties of the selected item appear in the properties pane on the right. When you right-click on an item in the explorer pane, you see a shortcut menu of actions that you may take on that item. These actions are also available from the menus at the top of the Connection Expert window. The most common actions are also listed in the Connection Expert s task guide (the left pane of the window). c You may also add instruments or interfaces manually to your test system configuration if Connection Expert does not automatically detect the hardware (for example, if it is connected via Ethernet or via serial port). See the Agilent IO Libraries Suite Online Help for more information on Connection Expert and on configuration changes. Test instrument connections: Connection Expert will automatically send an identification query (*IDN?) to any instrument that has its auto-identify property set to Yes. (See the Agilent IO Libraries Suite Online Help if you want to turn this function off.) When you see a green check mark on the icon representing an instrument, this means that the instrument has responded as expected. (Note that some instruments do not support the *IDN? query and will not respond 18 Agilent N4385A/N4386A Distributed Temperature System
Getting Started appropriately.) The instrument s identification information is displayed in the properties pane on the right side of the Connection Expert window. You can explicitly test the connections to your instruments, and exercise more of their functionality, by selecting Send commands to this instrument in the task guide or shortcut menu. This starts the Interactive IO utility, which allows you to send commands to your instruments and see their responses. Note that some commands (such as *TST?, instrument self-test) may take longer than Interactive IO s default timeout; you can modify the timeout in the Interactive IO window by selecting Interact > Options... 2 Continue with Starting the Distributed Temperature System on page 32. Agilent N4385A/N4386A Distributed Temperature System 19
Getting Started Distributed temperature system front and rear panels N4386A DTS outdoor series Tx/Rx Err A B This LED indicates communication activity between the DTS and the controller. Indicates the DTS has an error condition. Blinks until internal temperatures settle, then stays on until booting is finished. Stays on if there is a boot error. Switches on after booting as power indicator. Channel Indicates an active measurement on the corresponding channel. Alarm N4386A Distributed Temperature System LED is on when the value measured on the corresponding laser channel exceeds the predefined limits. Relays Connectors to input and output relays Status Tx/Rx Err A B Channel 2 3 1 4 Alarm 1 2 3 4 Connector Layout This diagram on the front of the unit shows the corresponding positions of connectors on the underside of the unit. Fuse Input Output I Output II 1 Channel 2 3 4 Replace only with same type (T4A L 250V, P/N 2110-1362). + - T4A RS 232 LAN USB 10-30V 40W max. Power Connect to DC power supply. RS 232 For future expansion LAN LAN connector, for link to controller. USB USB connector, for link to controller. Channel Fibre patchcords with E2000 angled connectors 20 Agilent N4385A/N4386A Distributed Temperature System
Getting Started Fixing dimensions for the N4386A DTS outdoor series Use M8x1.25 screws. Maximum available length of engagement 15mm Agilent N4385A/N4386A Distributed Temperature System 21
Getting Started N4385A DTS indoor series Tx/Rx This LED indicates communication activity between the DTS and the controller. Err Indicates the DTS has an error condition. A Blinks until internal temperatures settle, then stays on until booting is finished. Stays on if there is a boot error. B Switches on after booting as power indicator. Channel Indicates an active measurement on the corresponding channel. Alarm On when the value measured on the corresponding laser channel exceeds the predefined limits. USB LAN RS 232 Fuse Power USB connector, for link to controller. LAN connector, for link to controller. For future expansion Replace only with same type (T4A L 250V, P/N 2110-1362). Connect to DC power supply. Channel Connectors to optical fibres On/Off To switch DTS on or off. Relays Connectors to input and output relays Please Note: The output relay bank numbers decresase from left to right. 22 Agilent N4385A/N4386A Distributed Temperature System
Getting Started Using the default connectors CAUTION The Agilent N4385A/N4386A Distributed Temperature System is shipped with an angled contact optical output (E2000 8 angled, MM50 μm graded index). Angled contact connectors help you to control return loss. With angled fiber endfaces, reflected light tends to reflect into the cladding, reducing the amount of light that reflects back to the source. Use only cables with angled connectors with the instrument. Using a cable with a straight connector will damage an instrument with an angled connector. Using the connectors outside the case The E2000 connector can be unmounted from the housing and used outside the case. 1 Unplug the power supply. 2 The E2000 connector(s) on the DTS are inside the case. To access them, remove the cover of the housing. a You do this by using a Torx T8 screwdriver to remove the screws along the back of the housing. 2 b Lift off the cover. Agilent N4385A/N4386A Distributed Temperature System 23
Getting Started 3 Untighten the bushing on the rear left of the housing. 4 3 4 Remove the connector from the inside of the adaptor. 5 Thread the cable and connector through the bushing. 9 6 8 5 6 Make sure that the cable inside the housing lies in a relaxed arc and is not pulled tightly. 7 If you have more than one connector you want to remove from the rear panel of the housing, repeat Step 4 to Step 6. 24 Agilent N4385A/N4386A Distributed Temperature System
Getting Started 8 Tighten the bushing until the fiber can no longer pull through it (strain relief). 9 If you want to mount the cables on another panel, you can unscrew the holding plate with the adaptors from the inside rear of housing and reuse it. 10 Put the cover back on the housing and screw it shut. Splicing the sensor fiber The E2000 connector can be removed and the DTS spliced directly to the sensor fiber. 1 Unplug the power supply. 2 The E2000 connector(s) on the DTS are inside the case. To access them, remove the cover of the housing. a You do this by using a Torx T8 screwdriver to remove the screws along the back of the housing. 2 b Lift off the cover. 3 Remove the connector from the inside of the adaptor. 3 5 Agilent N4385A/N4386A Distributed Temperature System 25
Getting Started NOTE The instrument needs to be returned in the status as delivered. If changes have been made (such as changes to the connectors) it needs to be returned to the original status by resplicing connectors, otherwise the return will be treated as a repair. 4 Cut off the E2000 connector. 5 Untighten the bushing on the rear left of the housing. 6 Feed the sensor fiber through the bushing. If the sensor fiber has a diameter of less than 3mm, you will need to use the sealing inset with the correct diameter (see Accessories available from Pflitsch on page 67) to ensure the bushing can hold the fiber tightly enough to ensure strain on the fiber is not passed into the DTS. 9 8 6 7 Splice the sensor fiber to the DTS fiber. 8 Tighten the bushing until the fiber can no longer pull through it (strain relief). 26 Agilent N4385A/N4386A Distributed Temperature System
Getting Started 9 The fiber in the DTS should be wound onto the fiber tray, and the splice secured. 10 Put the cover back on the housing and screw it shut. Agilent N4385A/N4386A Distributed Temperature System 27
Getting Started Terminating the Sensor Fiber To guarantee the specification throughout the whole measurement distance, we recommend excess fiber of 200 m. The sensor fiber should be terminated to guarantee low back reflection. This can be achieved by winding at least 5 loops with diameter smaller than 5mm, by polishing an angle or cleaving of more than 14 to the fiber end, by immersing the end of the fiber in index matching fluid, or any combination winding, polishing, and immersing as described here. Please note, that a clean fiber end is a precondition for termination by polishing or immersing! 28 Agilent N4385A/N4386A Distributed Temperature System
Getting Started Connecting to the Output and Input Relays The DTS provides 20 relay outputs (volt-free contacts) that are capable of notifying the user of alarm conditions. The relays are normally open and in the event of an alarm condition the contacts will be closed. Reverse logic can also be programmed. The resulting ability to switch between these two states provides several options for the user. For example, the output can be used to operate external audible alarms or warning lamps. Programmable relay outputs 20 ( 10 per connector) Output connectors 2 Connector type SUB-D 25 pin female Voltage range Max 0.30 V DC Current range Max. 1 A DC Pin assignment connector 1 Output 1 Pin 1, 14 Output 2 Pin 2, 15 Output 3 Pin 3, 16 Output 4 Pin 4, 17 Output 5 Pin 5, 18 Output 6 Pin 6, 19 Output 7 Pin 7, 20 Agilent N4385A/N4386A Distributed Temperature System 29
Getting Started Output 8 Pin 8, 21 Output 9 Pin 9, 22 Output 10 Pin 10, 23 Not connected Pin 11, 12, 13, 24, 25 Pin assignment connector 2 Output 11 Pin 1, 14 Output 12 Pin 2, 15 Output 13 Pin 3, 16 Output 14 Pin 4, 17 Output 15 Pin 5, 18 Output 16 Pin 6, 19 Output 17 Pin 7, 20 Output 18 Pin 8, 21 Output 19 Pin 9, 22 Output 20 Pin 10, 23 Not connected Pin 11, 12, 13, 24, 25 The DTS also provides 4 opto-coupled inputs. The inputs are edge-sensitive and their polarity (rising or falling edge) is selectable by the user. The inputs can be configured to reset alarms that have already been detected. Programmable opto-coupled inputs 4 Input connectors 1 Connector type SUB-D 9 pin female Input voltage range 12 to 30 V DC, nominal 24 V DC Input current 5 to 15 ma DC, nominal 11 ma DC Pin assignment connector 1 Input 1 Pin 1 Input 2 Pin 2 Input 3 Pin 3 Input 4 Pin 4 GND Pin 5, 6, 7, 8, 9 30 Agilent N4385A/N4386A Distributed Temperature System
2 Making Measurements Starting the Distributed Temperature System.......... 32 N4385A/86A DTS Performance Test................ 33 Agilent N4385A/N4386A Distributed Temperature System 31
Making Measurements Starting the Distributed Temperature System 1 Turn on the distributed temperature system. 2 Allow it to warm up. LED A blinks until internal temperatures settle, then stays on until booting is finished. LED B switches on when booting has finished. Once the system has been turned on it can be controlled in one of two ways: Using the Agilent DTS Configurator software supplied with the system. The User s Guide for the PC software is included on the CD supplied with the distributed temperature system. Using your own program. This can be written using SCPI commands. The Programmer s Guide with a list of the available commands and some examples to get you started is included on the CD supplied with the distributed temperature system. 32 Agilent N4385A/N4386A Distributed Temperature System
Making Measurements N4385A/86A DTS Performance Test Equipment required The procedures in this section test the specified performance of the Agilent N4385A/86 Distributed Temperature Sensing (DTS) system. Specified quantities: Temperature resolution with sensing fiber length 2 km, Temperature resolution with sensing fiber length 4 km. Temperature resolution with sensing fiber length 8 km. The equipment required for the performance tests is listed in the table below. Any equipment which satisfies the critical specifications of the equipment given in the table, may be substituted for the recommended models. Instrument/ Accessory Required Characteristics Fiber Length J-Fiber OptiGrade Multimode Fiber 50/125 µm, class 600 Attenuation: ~ 0.7 db/km @ 1300nm, ~ 2.4 db/km @ 850nm Bandwidth: > 600 MHz km @ 850 nm & 1300nm Fiber spliced to the instrument (see note) - N4385A/86A -002: 2200 m - N4385A/86A -004: 2200 m and 4200 m - N4385A/86A -008: 220m; 2200 m and 4200 m NOTE The performance testing requires the fiber to be spliced to the instrument. If the DUT is connected to the DTS using an optical connector the temperature resolution performance is reduced (typically by 12% for a 0.5 db one-way connector loss). Specification may not be met when using a connectorized test fiber. Make sure that all optical connections of the test setup are dry and clean. Make sure that all optical connectors are undamaged. For cleaning, use the cleaning instructions given in Cleaning on page 44. Agilent N4385A/N4386A Distributed Temperature System 33
Making Measurements Notes on using the test record Instrument specification Performance test Test failure Temperature resolution test Results of the performance test may be tabulated on the Test Record provided at the end of the test procedures. It is recommended that you fill out the Test Record and refer to it while doing the test. Since the test limits and setup information are printed on the Test Record for easy reference, the record can also be used as an abbreviated test procedure (if you are already familiar with the test procedures). The Test Record can also be used as a permanent record and may be reproduced without written permission from Agilent Technologies. Specifications describe the guaranteed product performance. The specifications, listed in Specifications on page 61 are the limits against which the Agilent N4385A/86A is tested. Any changes in the specifications due to manufacturing changes, design, or traceability to the National Institute of Standards and Technology (NIST), will be covered in a manual change supplement, or revised manual. Such specifications supersede any that were previously published. The environmental conditions (temperature and relative humidity) must remain constant during the test [within the DUT operating temperature range and within the limits of the used test equipment (where applicable)]. Perform each step in the order given, using the corresponding test equipment. If the Agilent N4385A/86A Distributed Temperature Sensing (DTS) system fails any performance test, return the instrument to the nearest Agilent Technologies Sales/Service Office for repair. This procedure describes the temperature resolution performance test for a N4385A/86A DTS. 34 Agilent N4385A/N4386A Distributed Temperature System
Making Measurements Test procedure 1 Splice the test fiber to the instrument Use the 2200 m fiber to perform the temperature resolution test @ 2km, 10 min, spatial resolution setting 1.5m Use the 4200 m fiber to perform the temperature resolution test @ 4km, 10 min, spatial resolution setting 1.5m (N4385A/86A -004 only) Use the 8200 m fiber to perform the temperature resolution test @ 8km, 10 min, spatial resolution setting 1.5m (N4385A/86A -008 only) 2 Switch DUT on. 3 Place the test fiber in a stable temperature controlled environment at constant temperature between 20 C and 28 C and wait for the fiber temperature to settle. 4 Connect the N4385A/86A DTS to a remote controller PC through USB or LAN. 5 Setup the measurement configuration parameters: a Preset the configuration setting :CONFigure:MEASurement:SETTing:PRESet b Set the measurement spatial resolution to 1.5m :CONFigure:MEASurement:SETup:SRESolution 1.5 c Set the measurement sampling interval to 0.5m :CONFigure:MEASurement:SETup:SINTerval 0.5 d Set the measurement time to 10 min (600 sec) :CONFigure:MEASurement:SETup:MTIMe 600 e Set start distance to 0 :CONFigure:MEASurement:SETup:STARtdist 0 f Save the setting :CONFigure:MEASurement:SETTing:SAVE 1, default Agilent N4385A/N4386A Distributed Temperature System 35
Making Measurements 6 Start the DUT measurement of temperature distribution T i (index i for the measurement points along the fiber; 0.5m per point). a :MEASurement:SINGle 7 Wait for the measurement to finish a Poll until :MEASurement:SINGle? returns 0 8 Read out the temperature result trace T i a :READout:TRACe:DATA? 1 9 Calculate temperature resolution result a Calculate the smoothed curve S i S i = average of ±25 m (±50 points) around the temperature point T i. 26 25.5 Measured Temperature T Smoothed curve S 25 Temperature [ C] 24.5 24 23.5 23 0 500 1000 1500 2000 2500 3000 3500 4000 Distance [m] b Calculate the higher frequency variations H i H i = T i - S i c Calculate the standard deviation TStdDev in a window of ±25 m (±50 points) around the temperature point: TStdDev i = StDev idx=i-50 i+50 { H j } Note: TStdDev does not cover all values i (50 points are missing at the beginning and at the end, respectively) 36 Agilent N4385A/N4386A Distributed Temperature System
Making Measurements 0.8 0.6 High Frequency Variations H Standard Deviation TStdDev 0.4 Temperature [ C] 0.2 0 0 500 1000 1500 2000 2500 3000 3500 4000-0.2-0.4-0.6-0.8 Distance [m] d Calculate a temperature resolution fit curve LogTStdDev i = log 10 { TStdDev i } LogFit i is the linear fit (least-squares regression line) to LogStdDev i -0.6 0 500 1000 1500 2000 2500 3000 3500 LogStdDev 4000 Linear Fit LogFit -0.7-0.8 Temperature [ C] -0.9-1 -1.1-1.2-1.3-1.4 Distance [m] e Calculate the fitted temperature resolution TRi TR i = 10^{ LogFit i } Agilent N4385A/N4386A Distributed Temperature System 37
Making Measurements 0.25 Standard Deviation TStDev Temperature Resolution TR 0.2 Temperature [ C] 0.15 0.1 0.05 0 0 500 1000 1500 2000 2500 3000 3500 4000 Distance [m] 10 Check the temperature resolution TR i result against the test limit at the 2000 m point for the 2200 m test fiber at the 4000 m point for the 4200 m test fiber (N4385A/86A -004) at the 8000 m point for the 8200 m test fiber (N4385A/86A -008 only) 38 Agilent N4385A/N4386A Distributed Temperature System
Making Measurements Agilent N4385A/86A DTS Performance Test Record Page 1 of 3 Test facility Report No. Date: Customer: Tested by: Agilent N4385A/86A DTS Instrument N4385A N4386A Option -002-004 -008 Serial No. Ambient temperature C Firmware Rev. Relative humidity % Special Notes : Agilent N4385A/N4386A Distributed Temperature System 39
Making Measurements Agilent N4385A/86A performance test record Page 2 of 3 Agilent N4385A/86A DTS Report No. Date / / Test equipment # Description Model Length Cal. due date 1 Test Fiber #1 / / 2 Test Fiber #2 / / 3 / / 4 / / 5 / / 6 / / 7 / / 8 / / 9 / / 10 / / 11 / / 12 / / 13 / / 14 / / 15 / / 16 / / 17 / / 18 / / 19 / / 20 / / 40 Agilent N4385A/N4386A Distributed Temperature System
Making Measurements Agilent N4385A/86A performance test record Page 3 of 3 Agilent N4385A/86A DTS Report No. Date / / Temperature resolution test @ 2 km, 10 min spatial resolution setting 1.5 m Temperature resolution [K] Test result Temperature resolution test @ 4 km, 10 min spatial resolution setting 1.5 m (N4385A/86A -004 only) Test result Temperature resolution [K] Temperature resolution test @ 8 km, 10 min spatial resolution setting 1.5 m (N4385A/86A -008 only) Test result Temperature resolution [K] Agilent N4385A/N4386A Distributed Temperature System 41
Making Measurements 42 Agilent N4385A/N4386A Distributed Temperature System
3 Troubleshooting and Maintenance Cleaning.......................................... 44 Replacing the Fuse................................. 48 Checking the Operation of the Distributed Temperature System........................................... 49 Returning the Instrument for Service................. 50 This system should be serviced only by authorized personnel. Agilent N4385A/N4386A Distributed Temperature System 43
Troubleshooting and Maintenance Cleaning Safety precautions Agilent Technologies assumes no liability for the customer s failure to comply with these requirements. WARNING Please follow the following safety rules. Do not remove instrument covers when operating. Ensure that the instrument is switched off throughout the cleaning procedures. Use of controls or adjustments or performance of procedures other than those specified may result in hazardous radiation exposure. Make sure that you disable all sources when you are cleaning any optical interfaces. Under no circumstances look into the end of an optical device attached to optical outputs when the device is operational. The laser radiation is not visible to the human eye, but it can seriously damage your eyesight. To prevent electrical shock, disconnect the instrument from the mains before cleaning. Use a dry cloth, or one slightly dampened with water, to clean the external case parts. Do not open the card cage inside the DTS, or attempt to clean it internally. Do not install parts or perform any unauthorized modification to optical devices. Refer servicing only to qualified and authorized personnel. What do I need for proper cleaning? To clean the optical connectors and adaptors on the DTS, we recommend A stick cleaner for optical connectors, or the Diamond Ferrule Cleaner 2.5 (Diamond part number BCC 1030609 To clean the connector thoroughly, we recommend A cartridge cleaning tools such as OPTIPOP or CLETOP, or a card cleaner. 44 Agilent N4385A/N4386A Distributed Temperature System
Troubleshooting and Maintenance The E2000 Service-Adapter (Diamond part number GBC 1019034) WARNING Take care never to look into the end of a fiber or any other optical component when they are in use. This is because the laser can seriously damage your eyes. Preserving connectors Making connections Before you make any connection you must ensure that all cables and connectors are clean. If they are dirty, use the appropriate cleaning procedure. Dust caps Cleaning instrument housings Always make sure the dust cap on the E2000 adapter closes when the connector is not in use. Use a dry and very soft cotton tissue to clean the instrument housing. In the case of heavy dirt, you can moisten the cotton tissue in water. Agilent N4385A/N4386A Distributed Temperature System 45
Troubleshooting and Maintenance Cleaning the optical connectors and adaptors To clean the connector 1 Unplug the power supply. 2 The E2000 connector(s) on the DTS are inside the case. To clean these connectors thoroughly, remove the cover of the housing. a You do this by using a Torx T8 screwdriver to remove the screws along the back of the housing. b Lift off the cover. 3 Remove the connector from the panel adaptor. 4 Open the dust cap on the connector using the E2000 service adaptor. 5 Clean the end of the connector using a cartridge cleaner or card cleaner. 6 Remove the service adaptor. 7 Reinsert the connector in the panel adaptor. 8 When you have finished cleaning the connectors, put on the cover and screw it back into place. 9 Continue to clean the ferrule (see To clean the ferrule on page 47) 46 Agilent N4385A/N4386A Distributed Temperature System
Troubleshooting and Maintenance To clean the ferrule If you are using stick cleaners, 1 Take a fresh stick cleaner If you need to wet clean the adaptor to remove heavy dirt, wet the stick cleaner with ethanol or propanol. 2 Use a small pointed object to press down the dust protector inside the adaptor. 3 Insert the stick cleaner into the adaptor. 4 Rotate the stick cleaner 3 or four turns. 5 Remove the stick cleaner and dispose of it. If you are using a Diamond Ferrule Cleaner, follow the instructions that came with the device. Agilent N4385A/N4386A Distributed Temperature System 47
Troubleshooting and Maintenance Replacing the Fuse 2 1 Unplug the power supply. 2 On the rear or the underside of the distributed temperature system, use a flat-tipped screwdriver to open the fuseholder. 3 Pull the fuse holder and fuse clear of the back panel. 4 Take the fuse out of the fuse cap and note the fuse rating. 5 Make sure the replacement fuse (T4A L 250V, Agilent Part No. 2110-1362) has the same rating. 6 Put the fuse into the fuse holder. 7 Put the fuse and fuse cap into the receptacle in the rear of the case and press it into place. 48 Agilent N4385A/N4386A Distributed Temperature System
Troubleshooting and Maintenance Checking the Operation of the Distributed Temperature System 1 Power down the distributed temperature system. 2 Setup the hardware and connect the DTS to the controlling PC ( Setting up the hardware on page 15) 3 Connect a sensing fiber to the DTS 4 Switch-on the DTS 5 Observe the LED s on the DTS front panel while booting a At the start of booting all LED s are on for a few seconds. b As booting continues, LED A blinks until internal temperatures settle, then stays on until booting is finished. c LED B switches on to indicate the end of the boot process. The DTS is ready to use. Check the following error conditions: All LEDs off: Check the power supply. If the power supply is working check the fuse on the underside or rear panel of the DTS ( Replacing the Fuse on page 48). Try again The DTS doesn t finish the boot process or the error LED Err is on: Switch the DTS off and on and try again. If the error conditions still exist, contact Agilent for support. 6 Setup the DTS using the Connection Expert included in the Agilent IO Libraries (please refer to the information supplied with the IO Librarires) The Connection Expert on your PC should find the DTS and identify it with the identification query (*IDN?) 7 Start the DTS Configurator software 8 Setup and start a measurement with the DTS Configurator software (please refer to the information supplied with the DTS Configurator software) If there is a measurement problem, check if the sensing fiber is correctly connected. If you still have a problem, contact Agilent for support. Agilent N4385A/N4386A Distributed Temperature System 49
Troubleshooting and Maintenance Returning the Instrument for Service NOTE The instrument needs to be returned in the status as delivered. If changes have been made (e.g. changes to the connectors) it needs to be returned to the original status. This may mean resplicing the original connectors. Otherwise the return will be treated as a repair. Agilent Technologies aims to maximize the value you receive, while minimizing your risk and problems. We strive to ensure that you get the test and measurement capabilities you paid for and obtain the support you need. Our extensive support resources and services can help you choose the right Agilent products for your applications and apply them successfully. Every instrument and system we sell has a global warranty. Support is normally available for at least five years beyond the production life of the product. Two concepts underlie Agilent s overall support policy: Our Promise and Your Advantage. Our Promise means your Agilent test and measurement equipment will meet its advertised performance and functionality. When you are choosing new equipment, we will help you with product information, including realistic performance specifications and practical recommendations from experienced test engineers. When you use Agilent equipment, we can verify that it works properly, help with product operation, and provide basic measurement assistance for the use of specified capabilities, at no extra cost upon request. Often, many self-help tools are available. Your Advantage means that Agilent offers a wide range of additional expert test and measurement services, which you can purchase according to your unique technical business needs. Solve problems efficiently and gain a competitive edge by contracting with us for calibration, extra-cost upgrades, out-ofwarranty repairs, and on-site education and training, as well as design, system integration, project management, and other professional engineering services. Experienced Agilent engineers and technicians worldwide can help you maximize your productivity, optimize the return on investment of your Agilent instruments and systems, and obtain dependable measurement accuracy for the life of those products. 50 Agilent N4385A/N4386A Distributed Temperature System