Two Edge Seperation / PCI-6238 / Error -200140

Trying to use a PCI-6238 card to measure the time between Digital Inputs rising or falling. From what I was directed, this should be able to be done via the Two Edge Seperation Task... However, when I configure the task it seems that no matter what the Min. and Max Time I set, I get the error:
<<<<
Error -200140 occured at MyTwoEdgeSeperationTask - DAQ Assistant
Possible Reason(s):
Two consecutive active edges of the input signal occurred without a counter timebase edge.
Use a faster counter timebase.
>>>>
I can I change the Counter Timebase?? I thought the system selected the optimum counter timebase based on the Min and Max value entered in..
Thanks for any help.

Not at hw to test, but here are some brief thoughts anyway:
1. Error message sounds a little odd to me, almost like it's only looking at 1 input signal rather than 2. Could simply be poor choice of error text though...
2. There's a property called "Duplicate Count Prevention" that is frequently relevant to situations where the signals to be timed are faster than the timebase used to time them. If you search the forums for that term, you'll find more detailed info. The summary is that it can either be enabled or disabled and the behavior when the inputs are too fast are either to produce an error like yours or to return a measurement of 0. (I honestly don't know which setting does which -- it's easy enough to experiment and find out though).
3. The timebase can be chosen explicitly, though DAQmx should indeed have picked the appropriate one for your specified Min / Max. You'd probably want a Min of 0 and a Max that's less than about 50 seconds. My guess: DAQmx *did* pick the appropriate timebase, and the error text suggesting you use a faster one is just generic advice that doesn't actually apply to your case.
4. Two Edge Separation requires you to know which signal will come first. If you don't know which one will come first, you may still be able to accomplish your goal by setting up a "change-detection" DI task and then measuring the period of the change detection pulse signal with a counter. I know this would work on the 5V DIO versions of the M-series, but I'm not so familiar with your particular board.
-Kevin P.

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Two edge seperation counter

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I'm struggling to use the counter on a USB 6251 to count edges - can anyone advise?
I need to count edges on the source input between aux and gate inputs, using Two-Signal Edge Seperation Measurement as described on page 7-18 of the M series manual (April 06 371022F-01 release of this document). The device should be capable of this, it was sold to me specifically to perform this task.
My problem is that I can get seconds or ticks between edges on the Aux and Gate signals (on PFI 10 and 9 for counter 0), but not a count from the source input.
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Is there a setting I have missed that forces the device to read from the Source input (PFI8 for counter 0), instead of using it's own clock?
See attachment for code.
Bandit
Attachments:
Test Harness - Test counter.vi ‏23 KB

Hi Jon, thanks for the reply.
I'm measuring dynamic wear on a rotating drive nut. The nut is driven up and down a fixed threaded rod. Start trigger (edge one) is from a fixed position the nut passes. Pulses are counted from regular spaced lines around the nut. An index mark against one of these lines provides the stop trigger (edge 2). As the nut wears, the pulse count between edges will change and so wear in the thread can be measured. For this application a time isn't what I need - it's the fraction of a turn the nut makes between the start and stop trigger that I need to measure.
The USB 6251 was chosen for this task in conjunction with my local NI field engineer. We selected it after reading the M series manual section on Two-Edge Seperation, which describes measuring the seperation of 2 signals either in time, or as a count of source events (as per my original, not very detailed post). I have posted after spending a day trawling help files, product manual, vi libraries, user forum and knowledge base.
Two edge measurement should work from rising or falling edge of aux to rising or falling edge of gate (and it does). You get to choose rising or falling edge for each with the DAQmx Create Channel.vi in it's (CI Two Edge Seperation) variation.
The only problem I have is getting a timing input from the source connection.
I will check the DAQmx Count Edges task as you suggest, though at the moment I don't know how I use both start and stop triggers.
Watch this space for an update, or post any further info you come up with.
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Respect the phase issue how are you doing the acquisition of the signals, are you doing two independent acquisitions? if you are controlling them as independent acquisitions try to synchronize them with triggers and the clock.
How much are they out of phase?
By the way we know have forums in Spanish
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Samples Not Acquired on NI 660x or NI 6624 Devices When using pulse width, semi-period or two-edge separation buffered measurements with the NI 660x and NI 6624 on counters 0 and 1, some samples may not be acquired under certain circumstances.

In the DAQmx 9.4 Readme the following is stated:
Samples Not Acquired on NI 660x or NI 6624 Devices When using pulse width, semi-period or two-edge separation buffered measurements with the NI 660x and NI 6624 on counters 0 and 1, some samples may not be acquired under certain circumstances.
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Hi Ingram,
Thanks for your response regarding this issue.
Just to clarify, you are using the PCI 6250 to measure pulses from an encoder which is generating one pulse per revolution and turning at 1000 rpm and you are sampling this at 50kHz.
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ni.com/support

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@Dakotaep
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Hello,
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Two Edge Seperation / PCI-6238 / Error -200140

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