ADC-212 Accuracy of measurement

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granel
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ADC-212 Accuracy of measurement

Post by granel » Thu Sep 16, 2010 12:39 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
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Joined: Mon Apr 26, 2010 9:13 pm

Re: ADC-212 Accuracy of measurement

Post by granel » Tue Sep 21, 2010 9:12 am

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
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Re: ADC-212 Accuracy of measurement

Post by ziko » Tue Sep 21, 2010 1:16 pm

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
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Re: ADC-212 Accuracy of measurement

Post by granel » Wed Sep 22, 2010 8:50 am

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
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Re: ADC-212 Accuracy of measurement

Post by ziko » Mon Sep 27, 2010 2:52 pm

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

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