Electronics > Repair
INSTEK spectrum analyzer GSP-827 -6 dBm down than the real value
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Adal:
Hi everybody.
Recently I acquired an used INSTEK GSP-827 spectrum analyzer. During the initial test, I discover that the displayed level are -6 dBm lower.
For example the calibration level is:
-30 dBm @ 100 MHz   

It´s appear
-36 dBm @ 100 Mhz.     ???
The same level appears  if I put external RF Level.   

Fortunately, this machine include a input offset in order to compensate the "user" gain/loss.  So I use this machine as is.
I hear your recommendations or if someone have the service manual for this thing, I can attempt a correction. 
Best regards
G4JMO:
Hi,
I seem to have the same problem with my unit too!
Let me know if you find a solution or a source of service manual and I will do the same.
Best regards
Andrew
Adal:
Hi Andrew.

I think is a software issue, not hardware.  Because if I lower or increase the input RF level for example in 10 dBm, the spectrum follows the variation.
I write to Instek for a solution. Maybe you can write them too in order to "pressure" for a solution.

Best regards. 
G4JMO:
Hi, I've written to Instek too so hopefully at least one of us will hear back!
Will let you know if I do,
Best regards
Andrew
G4JMO:
I heard back from the manufacturer today - trying to point me to an authorised service centre and not responding to the question of whether the -6dB is a known issue:

Thank you for using GSP-827.
 
Could you please let us know the serial number of GSP-827?
We could trace and find the proper distributor to assist you soon.
 
As the GSP-827 need to be proceeded the complete calibration by ATE after repairing (include the components swapping),therefore, from this case,  we would have the authorized distributor to assist you solve the problem

Regards

Andrew
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