software triggered measurement of voltage, possible?

[Stephan@Ni]

Hello

I need to measurement a voltage at different positions of a sample. The sytem scans above the sample surface, each time a position is reached I want to start a measurement.

Currently I'm using this procedure, but it's very slow

Initialisation before the measurement:

• DAQmxCreateTask
• DAQmxCreateAIVoltageChan
• DAQmxCfgSampClkTiming

At each point of the measurement

• DAQmxReadAnalogF64     (this command needs about 95 milliseconds => 5 hours for 300 x 300 pixels)

Any idea how I can get this faster? Maybe using a trigger?

Thanks for any comment!!!

[Wetzer]

Hello Stephan,

when you got any digital Signal available that gives you a digital Pulse when the Sample Position is reached, you can use this Signal as a Clock Signal for your Aquisition. You then would use a Buffered Aquisition witch would lower the Overhead created by "On Demand" Sampling.

For further discussion the following Information would be useful:

-What DAQ Device do you use?

-What Driver do you use?

-What Developement Enviroment do you use?

Regards!

Moritz M.