Re: GPIB control of an HP8591 spectrum analyzer



Fred Bloggs wrote:


Fred Bloggs wrote:



Jeroen BELLEMAN wrote:

Fred Bloggs wrote:


I'm the (mostly) happy user of an HP8591E spectrum analyzer
equipped with a noise measurement option (Opt.119).

On the rear panel, it has a switched 28V power connector
to control a calibrated noise source. Does anyone know
how to switch on and off this output using GPIB commands?
(If that's at all possible?)




Nothing in any of these manuals?
http://www.home.agilent.com/agilent/techSupport.jspx?pid=1000002147%3Aepsg%3Apro&pageMode=MN&cc=US&lc=eng





Not that I could find. Anyway, the 28V output is specific to the
noise figure measurement option, but the associated docs, the
"HP85719A Noise Figure Measurement Personality User's Guide"
(who invents those silly phrases?) doesn't seem to have it either.


If not, then they don't like switching that power and some other output is available to control it...maybe through a switched attenuator or something...


Well, it's switched on and off at a rate of a few tens of cycles
per second while running the built-in noise measurement routine.
I'm trying to use a noise source that has relays in it, and which
cannot keep up with that switching rate.

Maybe you're right: They don't want me to control it directly. I'll
find some other way, if I have to.

Thanks,
Jeroen Belleman



If there is a workaround, it is not obvious. You're just going to have to get your hands on an HP 346B noise source...


Or hardwire your noise source ON, and then rig up a 28V to logic level controlled PIN diode or GaAs switch inline with its output, that is not hard...the drawback is the personality module stores an ENR profile for the 346B, but this can be manually recalibrated, which you might try with your new noise source.


Here is the technical info for the 346's:
http://cp.literature.agilent.com/litweb/pdf/00346-90139.pdf
which your SA expects....they are attenuated avalanche diode generators. Looks like they run $1k used.

.

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