BODE application weird readings

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f4hga
Posts: 10
Joined: Thu Sep 22, 2016 10:14 am

BODE application weird readings

Post by f4hga » Mon Feb 19, 2018 10:26 am

Hello
I have facing some issues with the BODE application for low pass filter at low frequency.
It is a basic RC network with a cutoff at 5khz (nothing rocket science).

If I use the basic BODE application from the bazaar (Bode plotter (0.94-564)) it works well.
If I use the advanced one (preinstalled on the card) I have weird readings.
The phase is not good, and the amplitude decrease as expected and suddenly goes crazy (sawtooth like).

Is this problem known ? Or is there something I miss ?

Ghislain.

f4hga
Posts: 10
Joined: Thu Sep 22, 2016 10:14 am

Re: BODE application weird readings

Post by f4hga » Tue Feb 20, 2018 9:07 am

Hello,

So I found the issue. This application seems to work only with LV settings on the Jumper.
It doesn't work with HV or if you set LV+ attenuation on the probes (in1 and in2).

I am satisfied with the result, but I am always a bit worried when using LV, it is easy to overdrive the input ....

Ghislain.

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