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Rohde & Schwarz CMU200

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Sas:
Here is the graphic of my two cmu200. The cable is 0.5m RG316 N-N between RF2 IN and RF3 OUT.
The first CMU200A calibrated in 07.2017. CMU200A in the middle of 2018 had a deviation of not more than +/- 0.5 dBm. Currently it has worsened and has a deviation of ~ -1.5 dBm.
The second CMU200B was calibrated in 08.2015. I bought a damaged one. Missing dsp module, damaged disk, several cables, gsm modules were damaged. We managed to fix and run everything. The device does not pass the RF Loop Path 1 test correctly. The values are too low from - 2dBm to -5dBm. I can't calibrate it myself.

Alfons:
Create a correction table yourself. There are instructions for this.

Sas:
RF Loop Path 1 CMU200 with calibration 07.2017. A year ago it was +/- 0.5 dBm. Now it is +0.8 dBm / -0.9dBm. Correction table does not work in the RF Loop Path 1 test.

Alfons:
@Sas: Is it possible to use one device to calibrate the other?

Sas:

--- Quote from: Alfons on December 17, 2019, 08:48:26 am ---@Sas: Is it possible to use one device to calibrate the other?

--- End quote ---
Not by substituting correction tables for individual modules from another device. You can try to modify the correction tables of individual modules. The editing software should already be used in the device for factory calibration. I don't know any service mode or calibration method.
Correctly you would have to calibrate as R&S does. They probably use a good laboratory spectrum analyzer and generator. Another CMU200 is not a very good reference standard. I guess the calibration is limited to connecting, heating up and using ready-made software via GPIB or COM connector.

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