I'm using a PXI-6602 to measure low frequences (each needs 1 counter).
In total i have to measure 6 different frequencies which are between [ 1 .. 10 000 ] Hz.
Because the update rate of each frequency should be independent from the other ones i have to use 6 different while loops !!
My problem is:
This solution works only for up to 4 frequency measurements.
If i use 5 or 6 while loops the update rate dramatically decreases.
For the test of the attached 'Parallel frequency measurement 6 counter - LV8_2_1.vi' i connected only 'PXI-6602/ctr0' with a
frequency generator. The other 'PXI-6602/ctr1'..'PXI-6602/ctr5' are not connected because i want to simulate behavior of different frequencies for the different counters.
1. Can anybody help me due to the fact that the PXI-6602 offers 8 Counters and it seems that i may only use 4 of them for this kind of measurement ?
2. Are there any settings or something else which must be set in LabVIEW or DAQmx ?
3. Is it possible to make some low-level access to the latch value of the counters ? If this would be possible i could calculate the frequency later in LabVIEW.
4. I would like to use a cDAQ9172 (2 Counter) and two USB devices (each with 2 Counter) for the same measurement.
Is the frequency or counter measurement relizable in the same way ?
Are there maybe other problems which could be expected ?
System description:
- Windows XP
- LabVIEW 8.2.1
- PXI-6602 ( in future cDAQ9172 + 2 * USB-6210 )
Hoping for your advice, thanks in advance !!!
