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The peak phase deviations are: 20k: 20 radians 10k: 40 5k: 80 2k: 200 1k: 400 500: 800 100: 4000 60: 6667 If your earlier results showed the loop starting to lose lock at 3300 radians the

I have the same experience with HP equipment going back into the 1950s when most things had vacuum tubes in them. The service manuals specifically noted that instruments rarely needed adjustment

Mike, I believe I have an 853A/8559A system, but I have not touched it in years. To get back to the problem, you said that you have no display - no display as in a totally blank display with no freq.,

Well let's see. Assuming your 10Hz mod rate and 33kHz deviation, the peak phase deviation at the VCO would be 33k/10=3300 radians. The loop divide number is 1080 so the peak phase deviation at the

A fairly good premise on most HP/Agilent/Keysight ETE is that if something is wrong or failing, do not start adjusting anything until you have isolated the problem area. Then if it is isolated to a

I connected the 8642 to a spectrum analyzer and found when I ran the generator into a transient failure condition the deviation was off and at times way to much deviation but upon bringing the

Hi , the big problem of these power supply are the electrolytic capacitors of the primary and secondary Em domingo, 4 de novembro de 2018 18:22:44 BRST, george edmonds via Groups.Io

Marc, Thanks, removing the input assembly is onerous but at least I have a clear path to follow; I feel much more confident now. Brian Sent: Sunday, November 04, 2018 12:16 PM To:

Hi Brian I have worked on the 8920 series The plastic mains switch actuator "rod" is the key, if you try to remove the power supply without removing it first you will damage it or the power supply

Hi Brian, never worked on a 8920, but I found a manual here ( http://exodus.poly.edu/~kurt/manuals/manuals/HP%20Agilent/HP%208920A,%20B,%208921A%20%20Assembly%20Level%20Repair.pdf ) which states on

Hi, I'm still working on my 3325b to fix the fail 026 error. Unfortunately it is not as simple as a bad connection. I'm going through the adjustment/troubleshooting guide, I purchased the Artek

modification to Newscope 6 brings great results plus an upgrade for better. Em domingo, 4 de novembro de 2018 15:58:54 BRST, Rick Boswell <frboswell@...> escreveu:

The power supply in my 8920 has failed and I want to try to repair it but I cannot figure out how to remove from the instrument. I have successfully removed all the screws which bind it to the

I was part of the design team on the 8642 but I’m not sure I remember the FM modulation details well enough. Is the error truly transient? Is the deviation correct after the error message?

700 MHz -140dB Mod out 1.00VL at 10Hz in FM mod in AC coupled? I am playing around with FM deviation, with test setup above 33khz is the threshold which it is about to throw an alarm, I can reduce

I am running my test with this setup 100Mhz -140dB RF output not used mod output connected to fm mod input AC coupled? mod output 1.00VL at 60 hz FM deviation 70 kHz if I drop FM deviation to 50kHz

Don, Good idea. Thanks for the suggestion. I removed the covers. There wasn't any corrosion but I noticed these were tabs holding the module i place. I removed the tabs and the module slid right

Boston metro area

The transient failure occurs when the phase deviation between the reference signal and the divided VCO signal exceeds the range of the loop phase detector. If you have the schematic you can look for

Hi All, I was overly optimistic when I thought it was a dry joint - Looks like the relay is sticking so I'm going to take it out and try cleaning it. However, in case I bugger it up, I'm wondering