6008 counter

[cees10]

Hi

Can any one tell me why i caanot use the signal as seen in the tdms file   about 4.2 volts   why the counter in 6008 does not see it?

Is there something wrong with my 6008? or   should it just work

is there anything i should change on this signal?

Also at my digital input channels does not see this signal    i tought below 2v  it low   and   above it a high

so no counter no digital i/0     only at analog signal

i have to do a count and calc speed so     counting freq is a bit much for this

Cees 

[Aaron_W.]

Cees,

Thank you for posting on the NI Forums.  I was able to look over the documentation for the USB-6008 and the specifications for counting events and it seems as though your signal meets the requirements for the device.

Input High Voltage: 2 Volts

Input Low Voltage: 0.8 Volts

Minimum High pulse width: 100 ns

Minimum Low pulse width: 100 ns

I was able to look over your TDMS documents and it appears as though your signal falls within all of the necessary requirements. Are you configuring your device to take a counter measurment on PFI0? My next recommendation for steps to try is to see if you can read in any digital signal. I would recommend using the Test-Panels in Measurement and Automation Explorer to see if you output a digital signal on one line if you can see it on another line. This would let us know if there was a problem with your device. Thanks!

[cees10]

Hi Aaron

Well i tried to digital port in on any port  but also no signal there

i tried evry channel there

And yes i configured as counter on PFI0   also no luck

I sent digital out though

And with other device i can sent digital out

i did the test with Panels in Measurement and Automation Explorer  

[Aaron_W.]

cees,

Sounds like the digital channels on the device are damaged in one way or another. Did you just recently get this device or has it been around for awhile? 

[cees10]

MMM

Sound not good

Well the device is  from feb 2008  ( i just checked), and rarely in use since we still need it as development for a   measurement system.

[Aaron_W.]

cees,

If you have used the test-panel and tried to connect one digital line with another and then see if you can detect a signal, and nothing works, then there is most likley something wrong with the device. If you have another USB-6008 to try and use that will let you know if it is a problem with that specific device. 

[cees10]

Hi aaron

the problem solved .ordered a extra 6008  for nothing

there was nothing wrong with it

the sensor has a PNP  as we normal have here, But it wants a NPN  (as you use in USA)  so lesson learned differant worlds USA and the rest  of us.....

Anyway never gone make this error again i guess

All those kind of sensors here are PNP

Cees