PXI-5660 / 5620. What is lowest reasonable voltage when using Analog Edge Trig?
Presently, I am using Analog Edge Ref Triggering on the PXI-5660. The lowest voltage that I can set the trigger level to is 0.200 volts without noise causing the trigger to occur. Is this level reasonable? Is there a way to reduce the noise so that the trigger level can be set lower?
I graphed the waveform coming out of the niScope MultiRead Cluster.vi in the ni5660 Read Average Power Spectrum.vi. The noise on the graph was as high as 0.190 volts. I thought that I saw the noise down to 0.010 volts at one time.
Thanks.
Thank you for your response.
The reference level I am using is 0 dBm.
I ran the ‘niScope SMT Power in Band.vi’ example with dithering enabled and disabled. I could see the noise when dithering was enabled and the reduced noise or no noise when dithering was disabled. See attached .jpg’s. I added ‘Waveform Graph 2’ to display the output of ‘niScope Multi Read Cluster.vi’.
In my application, I disabled dithering and put the trigger level lower. It now works.
Disabling dithering needs to be set after ‘ni5660 Configure for spectrum.vi’. Inside the ‘ni5660 Configure for Spectrum.vi’, a vi called ‘SMT Configure RFSA for Spectrum.vi’ enables dithering. ‘SMT Config niScope for Spectrum.vi’ is another vi that enables dithering.
Thank you for your help.
Attachments:
SMT Power in Band with 50 ohm termination on input of 5620 Dither Disable.jpg 100 KB
SMT Power in Band with 50 ohm termination on input of 5620 Dither Enable.jpg 106 KB
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