Re: E4401B No 50MHZ Cal signal
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Mark,
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The documents I am using are E4401-90474 ¡°Service Guide, ESA Spectrum Analyzers¡± and the CLIP for ¡°1.5 GHz RF (75 Ohm) E4401-60100.
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-- Mike
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Michael,
I see what you are talking about but you are misunderstanding the purpose of that (analog) MUX. It is selecting various analog signals (Vcc, temp, etc) and checking their levels, most likely with a DAC.
(not sure where ANA_TEST goes) So it is not supplying power to anything... it is reading it. Most likely during a self test. (maybe this gets enabled during the power-on sequence?)
You might also try the SERVICE MENU (password is "-2010") but I have not really used it before so be cautious!
Do you have the service manual? (E4401-90474)
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