Series 8650A Universal Power Meters - Giga-tronics

More documents

Recommendations

Info

Series 8650A Universal Power MetersMeter locks upYesCycle power with on/offswitch. OK now?YesDoneNoRemove line cord, wait2 minutes, reconnect.OK now?YesNoClear memory. OKnow?YesNoRepair/replace the hostboardNoReload Firmware. OKnow?YesNote 15Remote operationproblemYesPerform *idn? andcheck response. OK?YesRepair/replace the hostboardNoDoneYesCheck configuration(address,etc). OKnow?NoAnalog output failureYesClear memory andreconfigure AnalogOut. OK now?YesDoneNoRepair/replace the hostboardNoCheck the menuconfiguration. OKnow?YesFigure 5-6: Fault Isolation Tree (Other Problems)5-6 Manual 32089, Rev. A, December 2000
TroubleshootingNotes:1. The instrument power supply generates ± 6.5 V, ± 12 V, + 5 V and + 3.3 V. Check each of these voltages. The supply istransformer operated and uses individual switch mode regulators for the individual voltages.2. If the power supplies are OK and pressing buttons produces a ‘click’, then most likely the instrument computer is functioningand the LCD display itself is defective or the backlight (or its inverter power supply) needs replacement. The backlight doeshave a finite lifetime.3. Unplugging the instrument removes standby power and therefore does a more complete reset.4. Although this is not a highly likely failure mode, the instrument firmware may be easily reloaded from a PC. The code isavailable on the company website: www.gigatronics.com and the procedure for firmware download is located in theoperation manual.5. The cables used by Agilent (HP) will fit the connectors on this meter but they do not contain sufficient wires to operate thesensors.6. If another sensor is available, try substituting it.7. These power connections are part of the flex cables going from the sensor connectors to the signal processor board.8. Following any repair to a sensor, the sensor must be tested for proper VSWR and may need to have the frequency correctionfactors determined again.9. The calibrator output may be tested using the front panel calibrator control menu and another power meter. The intent hereis not to determine accuracy but functionality.10. The calibrator can be removed from the instrument as a sub-assembly and replaced. The calibrator stores its own factorycalibration data and needs no re-calibration when installed.11. See the appropriate section in this manual for the procedure. The purpose of the procedure is to determine, under controlledconditions, the meter and sensor meet the drift specifications.12. Giga-tronics power sensors are DC coupled. There must be NO DC component on the measured signal.13. The crest factor measurement may be verified by measuring a RF source which has 50% amplitude modulation. Under theseconditions, the crest factor should be 3 dB ± 0.3 dB.14. Sending *idn? Should return the meter model, serial number and firmware version. Proper operation of this query verifiesthe IEEE 488 hardware and the general software operation. If there is no response, the host board is likely defective. Do becertain that the instrument address matches the command address and that all cables are properly attached and known to begood.Manual 32089, Rev. A, December 2000 5-7
Page 2 and 3: All technical data and specificatio
Page 4 and 5: Preparation for ReshipmentFollow th
Page 6 and 7: Series 8650A Universal Power Meters
Page 33 and 34: Adjustments & Performance Tests2.3.
Page 35 and 36: Adjustments & Performance Tests2.4
Page 37 and 38: Adjustments & Performance Tests2.5.
Page 39 and 40: 3Theory of Operation13.1 8650A Powe
Page 41 and 42: Theory of Operation3.1.4 Calibrator
Page 43 and 44: 4Replaceable Parts4.1 8650A Replace
Page 45 and 46: 5Troubleshooting5.1 8650A Fault Iso
Page 47 and 48: TroubleshootingSensor will notcalib
Page 49: TroubleshootingCrest factor errorsN
Page 53 and 54: Troubleshooting5.2.3 Calibrator1. U
Page 55: IndexSeries 8650A Universal Power M

Series 8650A Universal Power Meters - Giga-tronics

Create successful ePaper yourself

Delete template?

Save as template?