Two edge separation only on first 2 channels?

Hello,
I have encountered a strange behaviour of the NI6602 Counter/Timer.
When I use the C# Meas2EdgeSeparation example as provided by NI, I am only able to have correct time measurement on channels 1 and 2. For the other remaining 6 channels the time will always be measured immediately when I only have a start signal, the stop signal is not required. This results in a measurement of 1.25 e-8 s, being the minimum value of this counter. It seems that the start signal is also seen as stop signal, but Two Edge Separation should not have this.
I have tried:
- using the wires of the other channels on channel 1 or 2: no problem
- disconnecting all other wires apart from the start signal for a channel: still a measurement of time, stop signal not necessary.
I have no idea what to do next, channels 1 and 2 are OK, which is bugging me the most.
Any suggestions are more than appreciated!
Best regards,
Rob

One simple idea is to parallel wire the opto signals to 2 different counters. Let one measure the forward time and the other one measure the rebound time.
If the edge sequence goes 1-2-2-1 (with two discrete pass-through events on opto2), you may need to set up the 2nd counter to use the trailing edge of the
opto2 pulse as an "Arm Start" trigger.
If you're using an M-series multifunction board, it may be easier to create a hardware-timed digital task and then figure out the timing with some post-processing.
-Kevin P.

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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.

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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.
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I am using labview 2011 and need to latch the data from two timer tasks of a 6602 board at the same time and then perform the read. One task is a period measurement the other is a two edge speration. It sounds pretty simple and I am sure it is, I just haven't located the correct information yet, If someone would point point me in the correct direction.
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While it's true that a digital edge arm start trigger can help to sync the tasks to begin together, the nature of the measurements you're making also have a big impact on whether you can depend on the buffered data remaining "synced." Both measurement types will latch measurement data at times determined by the signal(s) being characterized. You cannot configure either task type to sample at a known constant rate. You can only accept samples at the rate dictated by the signals' own edges.
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3. caveat: if you are somehow using the same signal edge for both measurements AND getting one measurement of two-edge separation for each and every period measurement, ONLY then would you be able to reconstruct the timestamps relative to the arm start trigger edge.
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Hi all,
I use a NI 6220 board and want to perform something very similiar to what is described in the knowledgebase article "How Do I Count Digital Edges Between a Start and Stop Trigger on an NI 6602 Counter/Timer Board?".
Does anybody know how I have to change the example program "TwoEdgeSep.c" to use not the internal timebase but to use an external source (the one I want to count the edges?
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Solved!
Go to Solution.

What errors were you getting?
The counter can count between 2 and 232-1 ticks. So... the rate that you specify will determine the minimum and maximum value (in terms of seconds) that you can count. These values are set when you create the channel:
It seems intuitive to try to put "0" for the minimum value, but that will give you error -200527 (Requested values of the Minimum and Maximum properties for the counter channel are not supported...). The real minimum value (in seconds) should be no less than 2 * (1/ timebase rate). I'm not sure if this is your issue or not, I'm just speculating.
EDIT: I just realized the default (if left unwired) for the minimum value is 1 µs. This would be below 2 ticks of your 10 kHz timebase so would give the same error. You need a minimum value of at least 200 µs.
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Hi,
I have two different TTL-level signals available, and I want to measure the duration of time starting when one signal goes high and stoping when the next signal goes high.
How can I do this using LabVIEW 5.1 and a NI DAQCard-6024E (PCMCIA)?
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Probably the best way to do this is to set up counter 0 to do triggered pulse generation and then do buffered period measurement on counter 1, with the second signal being the gate signal. In other words, the first TTL signal starts the first counter producing a pulse train and the second counter measures this pulse train until the second signal causes it to latch. Look at some of the examples for triggered pulse generation and buffered period measurement and this will probably help you get started.

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Two edge separation only on first 2 channels?

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