Agilent Technologies N3970A manual

Operating and Maintenance Guide N3970A OPTICAL POWER METER[...]

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■ N3970A OPTICAL POWER METER SOURCE QUICK REFERENCE GUIDE ■ T o remove interchangeable connector , move interface to mid position, and pull off adaptor . ■ T o defeat auto power-off , hold POWER for 3 seconds at turn on until ON and perm are displayed. ■ T o access hidden keypad , pull up display cover. Select POWER , Source , then: ■ T o[...]

1 O PTICAL P OWER M ETER N3970A Congratulations on your purchase of this instrument, which has been engineered to provide the best possible r eliability, convenience and performance. To get the best use from your equipment and ensure its safe operation, please spend a few minutes to read this manual. ■ IN TRODUC TION A ND A P P L I C AT I O N S[...]

2 ■ C O N T E N T S BEFORE READING FURTHER, OPEN THE CONTROL PANEL PICTURE AT THE BACK OF THE MANUAL Service and Suppor t 3 Introduction & applications 4-5 Safety Summary 6-7 Battery and external power 8 Optical connector 9-10 How to use: Getting started and turning on 11-12 Autotest operation 13-14 Power meter operation 15 Storing & reca[...]

3 N3970A UM-1 ■ S E R VICE AND SUPPOR T Any adjustment, maintenance, or repair of this product must be p e rf o r med by q ualifie d personn el. Conta ct your c ustomer engine er through you r local Agile nt T echnologies Ser v i c e Center. You can find a list of local service representatives on the W eb at: http://www.agilent.com/find/assist If[...]

4 ■ I N T R O D U C T I O N A N D A P P L I C AT I O N S The N3970A Optical Power Meter is used for field or laboratory testing of fiber optic systems at typically 850, 1300, 1310 and 1550 nm. It features superb measurement confidence, ease of use and reduced cost of ownership, and is for use by installers, technicians and engineers. Superior mea[...]

5 N3970A UM-1 The tone detector is very sensitive, and is useful for fiber identification, and calibrating the modulation frequency of test tone sources. The instru ment ha s shock absorbe nt corn ers, an d a toug h pol ycarbonate housing which ha s passed ext ensive drop t esting. T ypical applications ■ Sin glemo de tes ting, wi th ve rsa tile [...]

6 ■ SAFE TY S U MMAR Y The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technolog[...]

7 N3970A UM-1 ■ SAFET Y SUM MAR Y Initial Inspection Inspect the shipping container for damage. If there is damage to the container or Cushioning, keep them until you have checked the contents of the shipment for completeness and verified the instrument both mechanically and electrically . The Per f o r manc e T e sts giv e pr o c e d u r e s for[...]

8 ■ B A TTERY AND E XTERNAL P OWER T he i nst ru men t i s po wer e d by t wo 1. 5V dry b att e ri es (A l kal in e C) for an ope rating period of t ypica lly 250 ho urs or two 1.2V r echargeable batteries for an operating period of approximately 125 hours. Do not use lithium batteries or other batteries with a nominal voltage greater than 1.8 V.[...]

9 N3970A UM-1 ■ O PTICAL CONN EC TO R The optical port is mounted on a swivel, which allows the connector to be angled outwards for accessibility, and then pushed back and covered with the snap cover to provide dirt and drop protection. The other port can be used to store a spare interchangeable optical connector . T o install the connector adapt[...]

10 ■ OP TICAL C ONNECT OR Cleaning The glass power meter interface does not make contact with the inserted connector: there is a slight air gap. Therefore it should not wear out, and only needs occasional cleaning. T o c l ean th e g l as s p owe r me ter in t er fac e: r em ove th e interchangeable adaptor to access the glass interface, then use[...]

11 N3970A UM-1 ■ GETTI NG S T A R TE D AND TURNING ON Thi s and following sections s how you how to use your instrument: Check that the cor r ect accessories have been supplied, and an optical connector adaptor has been fitted. If you have any queries, call your supplier to resolve the situation. Put in the batteries, or plug external power into [...]

12 ■ GETTING ST A R TE D AND TU R NING ON T o disabl e or enabl e the bu zzer , h old dow n SHIFT fo r 3 second s. T o add the car r y strap: slip the end of the strap through the slit on the curved section at the back of the instrument, and secure the buckle. This instrument requires no warm up, and no user adjustment of dark current to achieve [...]

13 N3970A UM-1 ■ AUTOT EST OPERA T I O N General Autotest features For Autotest to function, all instruments involved in the test mu st be Ag il ent Ha ndhe ld i ns trum en ts w it h a n A utote st function. The Autotest feature performs automated measurement (and automatic λ detection) by data exchange between instruments, and requires minimal [...]

14 ■ AU TOTEST OPERA T I O N meter with a test lead. Set the source to Autotest mode, and then push SET REF on the meter for 3 seconds. This will store the reference at all relevant wavelengths. Either a ‘local’ or ‘remote’ reference can be stored. T o exit Autotest mode, either disconnect the optical test lead, or exit Autotest mode on t[...]

15 N3970A UM-1 ■ P O W E R M E T E R O P E R AT I O N After instrument turn on, the meter will be calibrated at the last used λ . To change parameters, push POWER METER, then: T o select a calibrated λ , push +/-. λ is displayed on the top right side of the display. T o display relative power, push ABS/REL. The display will show dB R. T o stor[...]

16 ■ S TORING & R ECALLING R EADINGS There are various ways of storing and recording data, giving the user flexible ways of working. They are summarised here for your convenience. Storage of reference values: A separate reference is stored for each λ and can be recalled when the instrument is next turned on. Display hold: To hold the display[...]

17 N3970A UM-1 ■ S TORING & R ECALLING R EADINGS The memory location is shown at the top right of the display . When storing data, the memory automatically increments to facilitate the collection of data on a job. Y ou can also go back and over-write particular records. After the data has been recorded, the entire memory can be cleared ready [...]

18 ■ RS 232 INT ERF A C E The connection details of the instrument, and connecting cables are as follows : Some (out of spec) serial ports need a 10 K resistor in the D connector across wires 1 & 2. Wire 1 (screen) Wire 2 Wire 3 Instrument Jack Plug Body (Gnd) Ring (Tx) T ip (Rx) 9 Pin D connector for RS232 Pin 5 (Gnd) Pin 2 (Rx) Pin 3 (Tx) T[...]

19 N3970A UM-1 ■ C ARE OF Y OUR I NSTRUMENT ■ Follow the directions in this manual on cleaning optical connectors. ■ Limit the input optical power to no more than 5 dB over - range. ■ During storage and transport, keep the instrument in its carr y case to protect against crushing, vibration, dust and moisture. ■ The instrument is resistan[...]

20 ■ A CCURACY C ONSIDERATIONS All measurements Optical connectors should be kept clean and in good condition. Due to emitter center λ uncertainty (eg 1310 +/- 20 nm), fiber attenuation may vary with different sources. This λ uncertainty can also affect power meter calibration. This is significant with InGaAs in the 850 nm band, and absolute er[...]

N3970A UM-1 ■ ACCURACY CONSIDERATIONS 21[...]

22 ■ C ALIBRATION & M AINTENANCE Enabling / disabling ‘shift’ keypad & re-booting the microprocessor: See section on ‘getting started & turning on. Calibration Calibration can be readily performed without opening the instrument. Calibration is performed by setting up a singlemode laser source at a stable but non-critical power l[...]

23 N3970A UM-1 ■ C ALIBRATION & M AINTENANCE ■ Measure and record the source power using the reference meter ■ T ransfer the same power level to the meter to be calibrated, set MAX/MIN to display power, then +/- to adjust the r eading to match the noted reference reading. Note: The optical power is measured only when entering this mode. I[...]

24 ■ C ALIBRATION , M AINTENANCE & INSTRUMENT RETURNS ■ Hinged display cover removal can be done at this point. ■ The ribbon connector can be disengaged to completely separate the instrument halves. ■ Further dis-assembly from this stage should be easily apparent to a technician. ■ Re-assembly is the reverse of the previous procedure.[...]

25 N3970A UM-1 ■ SPECIFICATIONS - DEFINITION OF TERMS Power Range The range of input powers for which the instrument can be used. Maximum Input Power The input power is not to be exceeded to avoid destroying the instrument. Uncertainty at reference conditions The uncertainty for the specified set of reference conditions, including all uncertainti[...]

26 ■ S PECIFICATIONS & O RDERING I NFORMATION Sensor Element InGaAs W avelength Range 850-1650 nm Calibration Wavelengths 850 1 , 1300, 1310, 1550 nm Power Range +5 to –60 dBm (850 nm) +5 to –70 dBm (other wavelengths) Maximum Input Power +15 dBm Uncertainty at reference conditions 2 ±0.13 dB (±3%) T otal Uncertainty 3 ±0.3 dB (±7%) ?[...]

27 N3970A UM-1 ■ S PECIFICATIONS & O RDERING I NFORMATION 1: All specifications at 850 nm are typical. 2: 23 ± 3 o K, -10 to –30 dBm, calibra tion wavelen gt hs ± 2nm, f iber typ e standa rd SMF , c onnector type ce ramic F C / PC, at d ay of calibration. 3: includ es uncerta inty contributions due to : uncertain ty at r e f e r enc e c o[...]

28 ■ S PECIFICATIONS & O RDERING I NFORMATION ORDERING INFORMATION Instrument N3970A Optical Power Meter Standard accessories: Included with instrument: FC, ST, SC optical connector, manual, batteries, NA T A traceable calibration certificate, car r y strap, pouch, protective holster & RS 232 cable. C onnect or op tions: Th is ins tr umen[...]

29 N3970A UM-1 ■ PERFO RMANCE TEST The procedures in this section test the performance of the instrument. The complete specifications to which the Agilent N39 70A Opt ical P ower Me ter is teste d are g iven o n pages 26-28 . All tests can be performed without access to the interior of the instrument. The test equipment given cor r esponds to tes[...]

30 ■ PER FORMANCE TEST T able 1 Required Equipment Instrument/Accessory Recommended Required Alternative Model Characteristics Models Lightwave Multimeter 8163A 8164A, 8166A Interface Module (one 81618A 81619A channel) Optical Head 81624A#C01 Laser Souce 1310/1550 nm 81654A 1305 ± 25nm 81657A or 1550 ± 30nm 81650A & 81651A Short Term Stabil[...]

31 N3970A UM-1 ■ P ERFORMANC E TEST T est Record Results of the performance test may be tabulated on the Test R e c o r d p rovided at the e nd of the t est pr o c e d u r e. It is r ecommended 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 eas[...]

32 ■ PER FORMANCE TEST Performance Test The performance test given in this section includes the T otal Uncertainty/Accuracy Test. Perform each step in the order given, using the cor responding test equipment. Note Make sure that all optical connections are dry and clean. DO NOT USE INDEX MA T C HING OIL. F or cleaning, use the cleaning instructio[...]

33 N3970A UM-1 ■ P ERFORMANC E TEST 4. Switch on the instruments. a. Switch on the lightwave multimeter. b. Configure the laser source. ■ Set the laser source attenuation to 0 dB ■ Set the wavelength to 1310 nm ■ N ote th e ac tu al ( di sp la yed ) w a vel en gth of the la se r s our ce i n t he t es t r e p o r t c. Switch on the attenuat[...]

34 ■ PER FORMANCE TEST 6. Measure the DUT. a. Make sure the N3970A (DUT) has warmed up b. Connect the attenuator output cable to the DUT as shown in figure below . T est Setup for the DUT Measurement c. Select the cor rect wavelength on the DUT. d. Set the attenuator to its value for setting 1. ■ No te the dis pla ye d po w er lev el of th e DU[...]

35 N3970A UM-1 ■ P ERFORMANC E TEST Model N3970A Optical Power Meter Serial No. Options Firmware Rev . T est Facility Performed by Special Notes Date Ambient Temperatur e o C Relative Humidity % Line Frequency Hz Customer Report No[...]

36 ■ PER FORMANCE TEST Description Model No. 1. Lightwave Multimeter 8163A 2. Light Source 1310/1550 nm 81654A 3. Optical Head 81624A #C01 4. Optical Head Interface Module 81618A 5. Optical Attenuator 8156A #101 6. 7. 8. 9. 10. Accessories #Product Singlemode Fiber 1 81101AC 1 81101PC Connector Interfaces 3 81000AI 1 N 3 9 7 0 - 6 3 2 5 1 C on ne[...]

37 N3970A UM-1 Model N3970A Optical Power Meter T otal Uncertainty/Accuracy Test T est Wavelengths = 1300 nm and 1310 nm Source Wavelength = nm Report No. Date ■ P ERFORMANC E TEST Setting Number 1 2 3 4 -3.00 dBm -20.00 dBm -30.00 dBm -50.00 dBm -3.30 dBm -20.30 dBm -30.30 dBm -50.30 dBm -2.70 dBm -19.70 dBm -29.70 dBm -49.70 dBm Measurement Unc[...]

38 ■ PER FORMANCE TEST Model N3970A Optical Power Meter T otal Uncertainty/Accuracy Test T est Wavelengths = 1550 nm Source Wavelength = nm Report No. Date Setting Number 1 2 3 4 -3.00 dBm -20.00 dBm -30.00 dBm -50.00 dBm -3.30 dBm -20.30 dBm -30.30 dBm -50.30 dBm -2.70 dBm -19.70 dBm -29.70 dBm -49.70 dBm Measurement Uncertainty dB dB dB dB dB d[...]

39 N3970A UM-1 ■ CLEA NING I N F O RM A T I O N The following Cleaning Instructions contain some general safety precautions, which must be observed during all phases of cleaning. Consult your specific optical device manuals or guides for full information on safety matters. Please tr y , whenever possible, to use physically contacting connectors, [...]

40 ■ C LE ANING INFOR MA T I O N dampened with water, to clean the external case parts. Do not attempt to clean internally. Do not install parts or perform any unauthorised modification to optical devices. * Refer servicing only to qualified and authorised personnel. Why is it important to clean optical devices ? In transmission links optical fib[...]

41 N3970A UM-1 ■ CLEA NING PROCEDU RES Keep your dust and shutter caps on when your instrument is not in use. This should prevent it from getting too dirty. If you must clean such instruments, please refer the instrument to the skilled personnel of Agilent's service team. Preferred Procedure Use the following procedure on most occasions. 1. [...]

42 ■ DIS CLAIMER & W A R R A N T Y Information in this manual is given in good faith for the benefit of the user. It cannot be used as the basis for claims against Ag ilen t T ec hn ol ogie s o r i ts r e p r es en tati ve s, if ac cide nt al damage or inconvenience results from use or attempted repair of the equipment. Agilent Technologies p[...]

43 N3970A UM-1 ■ N O T E S[...]

44 ■ N O T E S[...]