Yves,?
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OK. I just did a test with a SPAN from 30 KHz to 250 KHz and I have exactly the same problem.
A11 do not seems to be the problem on this unit.?
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30 KHz-250 KHz S11 response:
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Here is two pictures of the output of my 8753ES. One at 1 GHz and one ar 3 GHz with the same parameters (CW mode, 0dBm output, Trigger HOLD, measured on a Spectrum with 1 MHz SPAN, same RBW). The result is not as clean as your measurement. What is your conclusion about it ?
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1 GHz, 0 dBm, SPAN 0 mode, PORT 1 output: ?
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3 GHz, 0 dBm, SPAN 0 mode, PORT 1 output: ?
Here is a measurement of the R chanel output, I have about -16 dBm of output power. ?Same as your measurement.
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R output power verification at 1GHZ, SPAN 0 mode :
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MattSNE