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Products => Test Equipment => Topic started by: wldshy on November 21, 2017, 03:18:42 am

Title: Something wrong with my N9320A spectrum analyzer
Post by: wldshy on November 21, 2017, 03:18:42 am

Hi guys

there are something wrong with my spectrum analyzer, its signal level is 30db lower then excepted.
for example I feed a 10MHz  0dbm into, it shows 10MHz -30dbm,like following picture.
(http://bbs.38hot.net/data/attachment/forum/201711/08/231516neeluhzcstocodld.jpg.thumb.jpg)
(http://bbs.38hot.net/data/attachment/forum/201711/08/231521i5baj8bdppbi8pka.jpg.thumb.jpg)

and when try to calibrate ifself, it shows an error with ERROR 654,TO LOW INPUT, like this.
(http://bbs.38hot.net/data/attachment/forum/201711/08/230414ugp8vw18m2r22mkm.jpg.thumb.jpg)


is there anyone have same suggestion?
or where can I get service guide of the module. there is noting help on keysight website.

Title: Re: Something wrong with my N9320A spectrum analyzer
Post by: Neganur on November 21, 2017, 03:47:20 pm

Run a mechanical attenuators check from the service or alignment menu (don’t remember which).

Title: Re: Something wrong with my N9320A spectrum analyzer
Post by: nctnico on November 21, 2017, 04:26:20 pm

I see mdBm on the generator. Anyway, I'd check the signal from the generator's output with an oscilloscope to make sure the problem is in the spectrum analyser or generator.

Title: Re: Something wrong with my N9320A spectrum analyzer
Post by: AF6LJ on November 21, 2017, 07:45:34 pm

That's not a good sign, when you switch in different amounts of attenuation does the Analyzer show a correct value or are all the attenuator positions off by 30DB??

Title: Re: Something wrong with my N9320A spectrum analyzer
Post by: xmo on November 21, 2017, 10:28:43 pm

Does the front panel calibrator signal also measure 30 dB too low?