Reading 11 -60 pulses/s

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mworks
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Reading 11 -60 pulses/s

Postby mworks » Fri Jan 10, 2014 1:38 pm

Hi,

I would like to know if it's possible to count the frequency of a signal sending 12v pulses at around 11 - 60 pulses /s?

The emitor is an MSD ignition digital 6AL and I'm trying to read the tachometer signal.

Can my 8/8/8 do the trick or do I need something else?

Thanks,

Marc

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Patrick
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Re: Reading 11 -60 pulses/s

Postby Patrick » Fri Jan 10, 2014 3:50 pm

You would need to convert you signal down to 0-5 V.

Connected to an analog input, you should be able to read it no problem by using the 2ms or 1ms sample rates (assuming you have the newer 1018 with 1ms sampling).

Connected to a digital inputs, you might be able to read it, depending on the duty cycle.

Digital Input Sampling Characteristics:

The state of the digital inputs are reported back to the PC periodically. During this sampling period, if a digital input was true for greater than 4.0ms, the digital input is guaranteed to be reported as true in software. This makes the digital input much more sensitive to reporting TRUE state, and makes it useful to watch for short events. Any Digital Input True events of less than 1.5ms are never reported.

Also note that TRUE for the 8/8/8 means 0 V.


A 1054 Frequency Counter would read it no problem - without the need to convert from 12V to 5V.

-Patrick

mworks
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Re: Reading 11 -60 pulses/s

Postby mworks » Fri Jan 10, 2014 5:04 pm

Thank you for your fast and complete response!


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