HP
Troubleshoot And Repair HP 8561E Spectrum Analyzer –
Troubleshoot And Repair HP 8561E Spectrum Analyzer – Part 1
#Troubleshoot #Repair #8561E #Spectrum #Analyzer
“Erik’s Electronics Workbench”
Let’s find out why the displayed signal is not accurate on this Hewlett Packard 8561E 30 Hz – 6.5 GHz spectrum analyzer.
#electronicsrepair #spectrumanalyzer #hewlettpackard
This instrument was the subject of a previous video
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Fantastic video, thank you!
I saved three 85XX series SpecAns and have a bit more confidence going back to these!
I know, as you said, there is a cap, in the 'front end' that 'blocks' the D.C. … but, isn't it better to use a "D.C. block" anyway. Also, if you are working with that rf power sensor, why are you not using an attenuator on it?
Are you sure, you are not Mr. Carlson. You sound…despite the mic… just like him.
i have found i always need a better spectrum analyzer to fix a broken spectrum analyzer 😀
why did you open the case at 15:00? Would it be a valid test to switch to DC coupling and to switch manually to different attenuations, while applying the known signal? Or would that not tell us much?
Remember to check the rigid coax from between the attenuator and the filter, the fault could be that.
@7:25 an increase in level with an increase in frequency is usually a sign of a broken connection such as a pin etc. where there is a small gap in the transmission line.
only at 9:00 into the video, but increasing in accuracy at higher frequencies is usually a crack in the input coax (or semi-rigid coax), and now it's essentially AC coupled across the crack, with the coupling getting better as the frequency goes up. I've seen The Signal Path fix a few instruments with the same problem. It's about the best 'problem' you can ask for!