How can I control Timer/Conter input of an NI DAQ Pad-6259 by using the data acquisition toolbox ?

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Peter
Peter 2012-9-19
I Want to meassure the frequency of a rectangular binary signal with a counter input of an NI DAQ Pad-6259. I tried the way described in the matlab help. Here is the example.
s = daq.createSession('ni'); s.addCounterInputChannel('cDAQ1Mod5', 'ctr0', 'Frequency') s.inputSingleScan
if I do this, the method "inputSingleScan()" returns NaN.

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回答（1 个）

Manisha
Manisha 2012-9-19
Hi Peter,
It seems that your code is correct. I would double check your hardware setup.
1. Is your signal connected to the correct terminal. You can find the correct terminal by executing
s.Channels(1).Terminal
2. What is the amplitude of your signal. Make sure amplitude is high enough for your counter to detect it.
3. Are you getting the correct frequency using National Instruments MAX?
Hope this helps,
Manisha
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Peter
Peter 2012-9-24
My NI device supports 4 ways of meassuring frequency with a counter. The first two are for low frequencies, and the second thwo are for high frequencies. I don't know which of this 4 methods is used by the code shown in the matlab help. Each of this methods needs another connection of the hardware, but matlab supports only one funktion
s.addCounterInputChannel('cDAQ1Mod5', 'ctr0', 'Frequency');.
Can somebody tell me which method is used by matlab or how I can influence this ?

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