Hi Based on repairing a couple of the same era analyzers ….
It’s a good bet that you have lots / blown the mixer diode in the front end. There are various parts you can replace it with. It’s not brain surgery to do so on the models I have played with ( which does not include the 8593 …). The bad news on all of these beasts is that calibration was done on a now MIA test setup. It did this and that with who knows what and somehow shot calibration coefficients into somewhere on the analyzer. AFIK nobody knows how to do that. Bottom line, you have an analyzer that doesn’t quite look right / work right. Put another way, the “FULL” service manual does not exist / never did exist outside HP. For me that part wasn’t a big deal at the time. As the years rolled on, I did start running into tests where knowing this or that level was correct to better than +/- 10 db mattered. Am I sure it’s the diode in your case? Absolutely not !!! It’s just a guess. Bob > On Jan 26, 2021, at 3:36 PM, NE8S [G.W. Ko] Doc <[email protected]> wrote: > > Hello, T-N Gents, I hope someone out there can help me please. > > I am having some major trouble symptoms on my HP 8593EM EMC/Spectrum Analyzer > with Options 004, 010, 027. > > The S/N is 3649A00197. > > The display is showing the "LO UNLVL" and "FREQ UNCAL" errors. Also, this > analyzer is not able to complete any of the self calibrations but showing > "CAL SIGNAL NOT FOUND" and "<PHASE SYMBOL PHI> LOCK OFF" during the self-cal > process. > > It is my hope to locate the FULL original factory HP Agilent Service and > Maintenance manuals for this HP 8593EM EMC (Spectrum) Analyzer. > > Thank you in advance. Good health and happiness to all. > > Doc NE8S > > Emails: > [email protected] > [email protected] > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
