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HP 8662A Measurements
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John
I am currently trying to resolve an 07 error in an HP 8662A signal generator. Working on this unit there are power levels shown on the circuit diagrams for the various frequencies generated in the unit. When for example I look at the Service Sheet D? as a starting point the power levels quoted in table 8-218 are measured low when I look at the signal via an Advantest R3465 SA. On the list of test equipment for troubleshooting and calibrating the 8662A it lists an HP power meter and sensor. Also it is obvious that there are other signals at lower power levels detected by the SA take for instance the 10/20 MHz input to A6A4J1. When getting the 10 MHz signal there is a strong but lower magnitude signal at 20 MHz. But when the input is at 20 MHz there is almost nothing at 10 MHz. So my question is when measuring the power levels should I be using my HP 437 power meter to establish the signal level or are the power levels quoted purely for the signal at the frequency being measured. When there are multiple signals present my 437 will obviously read higher than the SA. Any help on this is appreciated.
John Proctor VK2DLP |
¿ªÔÆÌåÓýAlmost as a rule, it doesn't matter.? A discrepancy of a couple dB is unlikely to be enough to account for your symptoms.? I would just use an SA and evaluate the power at the frequency of interest.? In your example, a 20 MHz signal at 10 dB down might result in a reading about 1 dB higher on a power meter.? Given that it's a second harmonic, I suppose it would impact the duty cycle without altering the RMS value much, but either way the distinction isn't important.? If you're that close, the problem is elsewhere.? ? -- john, KE5FX ? From: [email protected] [mailto:[email protected]] On Behalf Of John
Sent: Wednesday, April 17, 2019 2:36 PM To: [email protected] Subject: [HP-Agilent-Keysight-equipment] HP 8662A Measurements ? I am currently trying to resolve an 07 error in an HP 8662A signal generator. Working on this unit there are power levels shown on the circuit diagrams for the various frequencies generated in the unit. When for example I look at the Service Sheet D? as a starting point the power levels quoted in table 8-218 are measured low when I look at the signal via an Advantest R3465 SA. On the list of test equipment for troubleshooting and calibrating the 8662A it lists an HP power meter and sensor. Also it is obvious that there are other signals at lower power levels detected by the SA take for instance the 10/20 MHz input to A6A4J1. When getting the 10 MHz signal there is a strong but lower magnitude signal at 20 MHz. But when the input is at 20 MHz there is almost nothing at 10 MHz. So my question is when measuring the power levels should I be using my HP 437 power meter to establish the signal level or are the power levels quoted purely for the signal at the frequency being measured. When there are multiple signals present my 437 will obviously read higher than the SA. Any help on this is appreciated. _._,_._,_ |