![]() ![]() ![]() Of course you will need to Normalized the Spectrum Analyzer (Step 2.) with the 50 Ohm Attenuator on External Amplifier's output. Edit: If your External Amplifier doesn't have a solid 50 ohm output impedance use a 6dB (Min.) to 10dB (preferred) 50 Ohm Attenuator between the Output of your Amplifier and the Input to your DUT. And if it does help, them this may be a useful alternative until this issue is properly addressed by Rigol. If this helps, the credit should go to 'Howardlong' from the work he did in the referenced link above. Does this provide the similar results as ' Howardlong' got with his -20dBm TG level? -> But of course you now have a higher TG Level for testing a DUC that has too much loss for testing at -20dBm. Connect your DUT/10MHz Filter between the External TG Amplifier's Output and the SA Input. You should now have 0dBm to +10dBm for testing a DUT (your 10 MHz Filter, etc.) due to the gain of the external amplifier. Connect the External amplifier's Output to the SA Input. Set the TG level at -20dBm (default) and add an external 20 to 30dB gain amplifier on the TG Output. Hello Giorgio: I think that it is very possibly an internal problem with the TG On while using a TG setting of 10MHz at a level greater than -20dBm, and not related to the actual SA Input level. I renew here the question: Is there anyone else who can confirm the Hardware/Firmware pair showing the bug? Cncjerry, better you buy a used HP/Agilent unit, you will be happier. When I met the german Rigol support at Friedrichshafen they gave me no hopes. ![]() I often need to build and trim 10 MHz filters and this bug make it impossible to do and for me this is not an instrument and Rigol is not giving any solution. If you use the instrument on the HF portion (as I usually do) you will hit this bug for sure. This small shift is the part missing of the trace when measuring a filter response 10 MHz As I said, maybe this bug is repeated at other frequencies I didn't check, maybe someone will find it. If you use a narrow bandwidth it's more evident. When I switch the TG ON (without connecting it to the SA input) I get the trace peak position shifting to the right (or left) a few pixels. Center frequency at 10.000 kHz to have the trace of the external generator. I did this check to confirm this (I explained in a replay above, to be able to check the bug without having a passband filter on 10 MHz): - Connected an external signal generator 10.000.000 Hz to the SA input. When the TG is OFF the SA works flawless. The bug is in the SA WHEN TG is activated. ![]()
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