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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

+-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;
????
-->
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;
????