Noise and DC offset cancelling on Picolog

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m3g4by73
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Joined: Fri Nov 20, 2020 5:40 am

Noise and DC offset cancelling on Picolog

Post by m3g4by73 »

Hi, I'm running Picolog 6.1.17 on OS X.

I'm finding a lot of DC offset and noise with the probes shorted together.

In the attached screen grab, the input range is set to +/-2 V range with no probe scaling and 1ms sample interval. The probe is simply connected to its own ground clip so should be reading a flat 0mv.

I know in the picoscope software there is a way to zero the probes out, but I can't find this in picolog.

The noise is quite significant too so any advice would be appreciated if this is not normal.

PS. Website not letting me attach images so here's a link to the screen grab in my dropbox:
https://www.dropbox.com/s/ms2c2nalzfnpu ... b.png?dl=0
Attachments
Screen Shot 2020-11-20 at 4.47.30 pm.png
Screen Shot 2020-11-20 at 4.47.30 pm.png
Screen Shot 2020-11-20 at 4.52.14 pm.png

Gerry
PICO STAFF
PICO STAFF
Posts: 798
Joined: Mon Aug 11, 2014 11:14 am

Re: Noise and DC offset cancelling on Picolog

Post by Gerry »

HI m3g4by73,

When you say probes shorted together do you mean Probe tip and ground clip? If so, then the Probe will be acting as an antenna and picking up any nearby interference. If you are just trying to look at the noise on the input, you should terminate the input with a 50ohm load, which represents the impedance of the Probe cable (we have terminators specifically for applications such as this, here: https://www.picotech.com/accessories/bn ... inator-bnc).

Regards,

Gerry
Gerry
Technical Specialist

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