Dear reader,
I can't get the combination of SDP-S (controller) and SDP-Z (RF unit) to work.
My PC has Windows 7
When I connect the SDP-S/SDP-Z to a USB port, the correct PC System messages come up:
Analog Devices System Demonstration platform SDP-S
At Details it says:
Creation date 02-12-2020
Version 2.14.0.0
After starting GUI ADI_SDP_Writer1 ( version April 12, 2017,9.39.52) and pressing button “CONNECT”
comes after a few seconds: SDP connected.
After this, according to the procedure, some calibration value entered with the GUI.
If I now measure the power, a very wrong value appears on the GUI display.
As an example I take the measurement at 1 GHz with a known connected level of 0 dB
A positive number of +39.5 dB appears on the GUI, so 39.5 dB is too high.
If you offer a level of -10 dB at the input, the GUI will indicate +29.5 dB, so 39.5 dB is too high.
At an input of -20 dB, the GUI indicates + 20.0 dB, so 40 dB is too high.
With no input signal, the GUI shows +5.0 dB?
In the table 3PointCal-LUT, the frequency of 1 GHz has the following value:
1000.60.5-34.0330578512397.58.2,-35.3780068728522,,895,2059,2664.
I think the last 3 values represent the counts of the AD converter. And if this assumption is correct
then the combination SDP-S and SDP-Z would work well. But the GUI makes the calculation mistake.
I can't figure out what and where it goes wrong can you help me?
I am an amateur (72 years) and have tried a lot but I can't get it to work properly.
Thank you in advance for your response. Best regards,
LLLRRR
