6259

Hello

I am currently using the connected to a block TBX-68 and Labview 2010 6259.  Basically, I'm trying to just use it for a multimeter to get accurate and timely measures, but there is something I don't understand all the examples in Labview.

My program is set up very similar to the "Acq a Sample.vi."  I use a wizard DAQ with CSR configuration.  When I connect a voltage source to a resistance that is connected to the PIN 68 to the TBX and spindle 67 to the land of the source voltage and the current measurement, I get a reading, however the current changes only as a source of voltage is changed.  If I trade on the strength of a higher (or lower) value, the current does not change.  I think it has something to do with the resistance of internal shunt within the program, but if I need to measure current with precision to determine an unknown resistance, how can I do this?

Mayy_B,

First of all, you should not use CSR to your measure, you should use NRSE because you don't measure a floating source.  More information can be found in this article: http://www.ni.com/white-paper/3344/en

Please note that this will change the wiring on the TBX-68 block and require the negative line go to pin 62.  In addition, there is no internal resistance in the 6259, an external shunt resistance must be used.  This resistance must be connected between pins 68 and 62.  You specify the value of the resistance in the DAQmx create virtual channel vi which is put in place for the current task of Analog Input.  This should lead to a current measurement precise.

Tags: NI Hardware

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