Electronics > Repair

INSTEK spectrum analyzer GSP-827 -6 dBm down than the real value

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G4JMO:
Results from the 'start from cold' test...

The same drift profile occurred. After settling at ~ -31dBm the level stayed more or less constant for about 3 hours. Then in the space of about 1 hour, the level drifted to ~-35dBm. Power cycling returned the reading to -31dBm. So as long as I remember to power cycle after its normal stabilisation period, it's manageable.

The question remaining is whether Adal see's the same kind of drift profile and recovery or whether his unit is suffering from a different problem.

Adal:
Hi everybody.
Here are the result of my own test
After 6 hours my GSP-827 Shows -35 dBm in the calibration signal. No changes if I cycle on-off the spectrum analyzer.

KJDS:

--- Quote from: Adal on March 20, 2015, 10:54:46 pm ---Hi everybody.
Here are the result of my own test
After 6 hours my GSP-827 Shows -35 dBm in the calibration signal. No changes if I cycle on-off the spectrum analyzer.

--- End quote ---

That's an odd looking shape. Can you halve the bandwidth but leave the RBW the same, then check the level with each of the RBWs, you'll probably need to reduce the span for the narrow bandwidths.

Adal:
KJDS here are the result of one test. No matters what RBW use, the error level remains the same. I need check the input path and check again

Adal:
Here are the result using the same settings of Andrew spectrum analyzer. ????

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