TBX 68 board user guide

[Starting]

Dear all, some basic questions if you do not mind:

Is there any user guide manual for the TBX-68 board?. I came across a  NI 4350/4351 User Manual where it is referenced a lot, but it does not give any particular information on connection procedure.

Is there any appropriate section of a manual to follow for VIs specific for this type of application?

Can I use the TBX-68 for reading samples of around 5000 Hz? 

The TBX-68 I have is part of a kit developed by Industrial Measurement Limited (UK)to measure torque, speed and voltage. Now, I want to make a general use of it. I want to measure airspeed at frecuencies around 5 kHz, but the in built program only allows to read up to 0.01 secs (100 samples per sec).

Any reply is certainly welcomed.

[Dennis_Knutson]

The TBX 68 is nothing more than a simple terminal block and doesn't do any acquisition. You connect a 68 pin cable from a DAQ board and those pins are mapped one to one on the 68 screw terminals of the TBX 68. You would then wire from the screw terminals to the voltage point you want to measure. If you are looking for examples for acquisition, determine the actual DAQ board in your computer and post back with that information.

[Starting]

Hi Dennis,

Thanks for replying.

Obviously I am not an instrumentation guy, nevertheless I should learn a bit before using this. The acquisition card is a PCI 6023E, it has been mounted for nearly 5 years in the computer and as I said, I pretend to give it a more general use than it has now (if it possible). The computer has installed MAX 2.1 and LabView 7. The questions remains mostly the same: 0) Feasibility of using the card for sampling 10 kHz (as per its manual [https://www.ni.com/docs/en-US/bundle/322072c/resource/322072c.pdf] it does, 200 kS/sec guaranteed), 1) connecting the sensor cables to the TBX 68: if there is a very basic user guide out there. All I see are numbers corresponding to terminals. Dont understand yet; 2) if there is any available acquisition example it is certainly welcomed (I suppose the driver is already installed in the PC, although current sampling is performed not using LabView).

Finally, is it possible to unmount the card from the PC tower and take it to another (better) PC?

Thanks for any reply.

Carlos.

[Dennis_Knutson]

Okay, to answer some of your questions, since the board has a 200ks/sec samepl rate, then 10 Khz is easily possible. Please note that the200 Ksec/sec is an aggregate sample rate. what this means is that since the board has a single A/D converter and multiple channels and muxed into the A/D, the sample rate per channel goes down as you add channels. You divide the board setting by the number of channels to get the sample rate per channel. If for example, the board is set to the maximum and you have two channels, the rate per channel is 100 Ks/Sec. Four channels and it becomes 50 Ksec/sec, etc. There is a tutorial called Field Wiring and Noise Considerations for Analog Signals that you should look at. There are probably others at the NI Developer Zone. Try doing a search. LabVIEW comes with numerous example programs for data acquisition. Go to Help>Find Examples and select Hardware Input and Output. Examples are broken up into DAQmx and traditional DAQ. DAQmx is a newer hardware driver for DAQ and is recomended for new development. There are a lot of other examples at the above link. You can move the board to any pc you want. In order for the board to work, you have to first install the hardware driver (DAQmx, traditional DAQ, or both). The latest versions of both can be downloaded for NI's site here.

Message Edited by Dennis Knutson on 10-25-2006 06:32 AM