Counter frequency measurement freezes when away from zero point (NI USB 6343, Error -200284)

[Brown@KTR]

Forum members,

I am having issues with a frequency measurement on an NI USB 6343 X series Mulitfunction DAQ.  I'm using Counter 1 (Gate pin 77 for frequency signal, DGND pin 82). The HBM T10F torque flange that I'm using (powered by a 24V supply) outputs a frequency signal between 5000Hz and 15000Hz with 10000Hz being the zero point. The torque flange has a capacity of 5kN.m (15000Hz = 5kN.m  ; 5000Hz = -5kN.m). 

I have been using the attached VI for a few months now with no problems.  Now, the VI runs well as long as the torque stays within a few hundred Hz of the zero point.  However, once the frequency rises beyond this the torque reading starts to freeze and eventually I get either of these two errors: -200279 or -200284 related to samples not being available.  I've noticed that the active light on the DAQ shuts offs during these freeze periods. 

Here's a step by step example of my problem using the torque flange's shunt cal:

1. I run the VI and torque reads properly around 10000HZ (Active light ON, Ready light ON)

2. I apply the 5V excitation to the shunt cal and the frequency jumps to approximately 50% of the torque flanges capacity (as it should)

3. As soon as I remove the 5V of excitation the reading freezes and the Active light on the DAQ turns off. 

4. If I apply the 5V again, before the timeput occurs, the Active light comes back on and the DAQ reads the signal properly. 

Would this type of problem be more DAQ related or is it the torque flange itself.

Thanks in advance,

Mike

[Brown@KTR · Accepted solution]

Solved. 

I've done some troubleshooting this morning and it turns out that the vibrations of the system had loosened a screw that was connector to the stator of the torque flange causing a poor electrical signal from the torque flange itself.

Everything is working properly again.

-MB