Hi Everyone,
We have been checking our vibrating wire logger with a Function generator before deployment. It has been working out well.
Currently, we have an issue with a newly set logger with a CR1000Xe and an AVW200 controlling 2 numbers of multiplexers (AM16/32B). The AVW200 are configure to pakbus: 200, low power multiplexer AM16/32B and both VW channels frequency range 450 to 6500Hz.
Let’s say when we connect the function generator output to multiplexer 1’s white channel 32, ideally only this channel should have reading. But now multiplexer 2’s channel 32 also has reading (we did not connect any wire to this channel). Both readings are close to applied (460Hz) but not the same (459.9928Hz and 460.044Hz).
The logger was works fine when we connect some vibrating wire strain gauges on it. It reads correctly.
We tried different frequency and amplitude from 300mV to 2V peak to peak on the Function generator same issue. Usually, we set Function generator to 500mV peak to peak.
We had also tried replace the AVW200 and the multiplexer.
We suspect the function generator is affecting the AVW200, but not sure how can we solve it. we had tried earthing the CR1000Xe, AVW200 and multiplexers.
Can someone advise us. Thanks in advance.
Our Program:
Public DST(64,6), VWHz(64)
SerialOpen (ComC1,38400,0,0,10000) 'Turn on ComC1 (C1-C2) for direct communication with AVW200.
AVW200 (AVW_Result(1),ComC1,0,200,DST(1,1),1,1,32,450,1200,2,_60Hz,1,0)
For x = 1 To 32
VWHz(x) = DST(x,1)
Next x
AVW200 (AVW_Result(2),ComC1,0,200,DST(33,1),2,1,32,450,1200,2,_60Hz,1,0)
For x = 33 To 64
VWHz(x) = DST(x,1)
Next x
Thanks
TLT
Hi Everyone,
By using Device Configuration Utility, AVW200's Troubleshoot. We connected the Function generator output into MUX 2 white channel 12, applied 470Hz at 300mV, MUX switched to 2x32. We get Peak Frequency: 469.98Hz and Peak Amplitude: 105mV, after Poll Channel 2, MUX channel 12. Thats look fine.
However, when we Poll Channel 1, MUX channel 12. We get same Peak Frequency: 469.98Hz, but Peak Amplitude is only 0.02mV, As this channel should not has any reading, becasue the function generator output is still connected to the MUX 2 white channel 12.
Please advise what could be the caused of this issue. Thanks
Regards
TLT