[Test-Equipment] HP-3335A no output...

[GandalfG8 at aol.com]

In a message dated 13/10/2009 22:52:55 GMT Daylight Time, gelabel at gmx.net  
writes:

I have  an HP-3335A Level Generator which was placed on a shelf, unpowered, 
a few  years ago.
At that time it worked ok. Today I have powered it on again,  apparently 
all is ok, the front
panel behaves as expected, but there is no  output, nor from the 50 nor 
from the 75 ohm
BNC  connectors...

Changing the level from the front panel produces some  relay clicks.
Any clues on what it can have happened, and what to check  ?



------------------
Hi Alberto
 
I don't know how similar the 3335 is to the 3336 but a big problem on  some 
of those was one version of the output attenuator where pads on the circuit 
 board were used to form part of the relay contacts that switched the 
attenuator  sections.
 
The first check I would suggest is to open it up and check the signal into  
the attenuator. If the signal is there at least you know where the problem 
lies,  even if fixing it might not be so easy.
 
I have a pdf ops and service manual if you need it, although it's  probably 
available as a download online.
 
regards
 
Nigel
GM8PZR