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DC Calibration

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DC Calibration

Postby BDR » Mon Feb 13, 2017 1:26 pm

Good day,

I have 5 PS6404D scopes. I have noticed that some of the channels, not all, are sitting up at around 1.8mV DC on more than one of the scopes. I have tried the zero off set button. I am not sure if this is like a "signal path" function, but in some instances it makes it worse.

From most of my experiences with these scopes, it normally sits around -+400uV. The calibration sticker says that they were last calibrated by Picotech. Is this normal?
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Re: DC Calibration

Postby Martyn » Tue Feb 14, 2017 1:17 pm

If you leave the scope running for around 15 minutes, and with all four channels enabled, does the offset disappear ?
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Re: DC Calibration

Postby BDR » Tue Feb 14, 2017 6:32 pm

No, it does not.

It seems to be slightly better than yesterday, but I may have been using a different scope.

It has been running for about 30minutes with all channels on.
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Re: DC Calibration

Postby Martyn » Fri Feb 24, 2017 7:14 am

I would have expected it to settle more than that, can you post a data file showing the current waveform just after turning on, and another one after the unit has been on for a while, and running at full speed.

When using the Zero offset what values are being reported, they should be listed if you open the View->Properties panel on the right of the screen.
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