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granel
Newbie
Posts: 0
Joined: Mon Apr 26, 2010 9:13 pm

Limit of measurement of DC 20V, at short circuit on an input the program shows DC = -445mV?
How to make calibration of an oscillograph for correction of DC error?

granel
Newbie
Posts: 0
Joined: Mon Apr 26, 2010 9:13 pm

### Re: ADC-212 Accuracy of measurement

can i eliminate an error in 0,5 volts at measurement on a limit of 20 volt (on other limits of measurement an error less)?

ziko
Posts: 1705
Joined: Fri Dec 01, 2006 10:03 am
Location: St Neots

### Re: ADC-212 Accuracy of measurement

Hi this could be a bad earth on your cable, can you try using a different cable? Do you see this effect with nothing physically connected on the input?

Kind regards
Ziko

Technical Specialist

granel
Newbie
Posts: 0
Joined: Mon Apr 26, 2010 9:13 pm

### Re: ADC-212 Accuracy of measurement

with nothing physically connected on the input:
AC or DC -->
+-20V A_ch=-0,449V; B_ch=-0,445V;
+-10V -0,225V / -0,224V;
+-5V -0,115V / -0,107V;
+2V -0,042V / -0,031V;
+-1V -23mV / -23mV;
+-500mV -11mV / -11mV;
+-50mV -1,2mV / -0,85mV;
auto -1,2mV / -0,86mV;
????

ziko
Posts: 1705
Joined: Fri Dec 01, 2006 10:03 am
Location: St Neots

### Re: ADC-212 Accuracy of measurement

This indicates that some components on the analogue front end have been damaged. The unit would have to be sent back to us for repairs.

If you wanted to do this you need to send an email to support@picotech.com detailing the problem and your full return address along with the serial number of the unit.

Kind regards
Ziko

Technical Specialist