Electronics > Beginners
First Spectrum Analyzr HP 8590A
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Crambone:
Hello, I recently picked up an HP 8590A that showed it passed all the CAL tests. I’m not sure if I’m doing something wrong but when I inject a 27.50MHz frequency into the 50ohm input I’m not seeing anything. I’ve tried slowly amplifying the signal but don’t see the one I’m injecting. I do on the other hand find one that’s 2-3MHz off frequency.
To get we’re i am I insert the signal (27.5) go to Starting freq 26.0MHz and Ending at 28MHz. I then see a 3 spikes one small one lager and one small but all are not the frequency I’m injecting.
Am not seeing something?
Beginners mistakes?

Thank you, Drew
MarkL:
Did you run the calibration yourself or do you mean you only saw a picture of it completing calibration?

What are you using as your test signal source?

How about some screenshots of what you're seeing?
chrisl:
Do you see the correct level and freq of the cal signal if you connect the input to the cal output using a short cable?
Please upload some pictures of your setup including the signal source and screen shots of the S/A so we can see the setting of the S/A and the generator.
Crambone:
Well maybe I should start at the beginning, when turned on the screen jitters. https://youtu.be/rmj_mluO1BY
After warmed up it looks like pic.
Crambone:
Im going to let it warm up for 2 hours and then run the Cal Freq, Cal Amptd, Cal Store then I will retrieve the screen requested and add a photo of its findings and corrections.
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