Input analog does not

Recently, I was unable to read an analog signal. I use a TBX-68 block attached to a card PCI-MIO-16XE-50.  The signal will be max to everything I put the maximum voltage reading when I hang anything to her.  It will read zero volts with noise when the wires are not connected to anything and it will read somewhere around 6 + / 2 volts when two wires are connected to each other, far away from the 0 volt I expect.  I tried to replace the Board with another PCI-MIO-16XE-50 without success.  I connected the wires to the different analog inputs too.  I know that its reading of the entries that I hung up because it will react to what I do only for the entries that I've specified (is it is connected to AI 1 and I connect a battery to 2, playback is not affected).  Digital and analog outputs are working properly.

Recently I am gone in DAQ Express changed some things for me to specify my front channels, but it does not work when I create a new too.  Could I have definitely changed the DAQ Express?  He was working before I messed up with this stuff, but it can also work after.  I don't me remember the last time it worked however when I opened first the front of an Express DAQ.

I have attached a VI just that I expect to read the voltage input (even with nothing plugged, it's the reading-10 volts).

Hey, pagoda.

Looks like you may be in differential configuration and cannot be biasing the input rows. Differential configuration, the two lines of entry of a channel must receive ground somehow bias; It may be through enormous resistance, but something to attach the tension to keep them from floating away. Connect the + and - lines together is not enough, because that does not provide a path to Earth.

Try to connect both + and - directly to the analog ground and see if you read a quiet 0 V. If it works, then connect the inputs to everything you want to measure. As long as both + and - has a way of DC grounded, however diverted, everything should work fine.

Normally, if your source is floating, you'll want to link the - entry to your device and the mass also directly to analog. If your source is connected, you should not connect - ground, since it is probably already connected.

Hope this helps,

EBL

Tags: NI Hardware

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