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Strange behaviour of input attenuator on 8596E spectrum analyser

Question asked by f4fei on May 6, 2013
Latest reply on May 7, 2013 by f4fei
Hi,

I have a HP8596E spectrum analyzer with the following troubleshooting:

- Input level: CAL OUT (300 MHz, -20 dBm)

- When switching the input attenuator on all its _even_ positions (-20, -40 and -60 dB), the measured level is correct (-20 dBm). Just the noise floor level is increasing, which is normal.

- When switching the input attenuator on all its _odd_ positions (-10, -30, -50 and -70 dB), the measured level is wrong (about -15 to -20 dB), but only during 10 to 15 seconds. After this delay of time, the level increases slowly and becomes correct again. 

Does somebody have an idea about this behavior and how to cure that?

I would appreciate some hints.

Regards

Dominique  

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