can we generate millivolts using pci 6723 card

[krishna_ak]

HI,

Can I knw how can we generate a analog input in Millivolts using PCI-6723 card.

Using the below function I am able to generate volts in the range -10 to 10 v

.DAQmxCreateAOVoltageChan(*taskHandle,"Dev1/ao0 : Dev1/ao1","",min,max,DAQmx_Val_Volts,NULL);

In the above function 5th parameter is used for generating analog input in volts but I would like to generate a millivolt.

Plz reply me ASAP

Regards

krishna

[mvr]

If you call a function such as DAQmxWriteAnalogScalarF64(), the parameter float64 value is a floating point number.  So to output 100mv you would set 0.100 as the output value.

[Mert_A.]

Alternately, you can create a custom scale like this:

DAQmxCreateLinScale("mV scale", 0.001, 0.0, DAQmx_Val_Volts, "mV");

then use that scale name when you create your channels:

DAQmxCreateAOVoltageChan(..., DAQmx_Val_FromCustomScale, "mV scale");

If you use the custom scale as I've described, make sure that the min and max values you pass in to DAQmxCreateAOVoltageChan are in mV (i.e. 10000 instead of 10).

Mert A.
National Instruments

[krishna_ak]

Thanks for reply

Its working now

Regards

krishna