04-06-2012 07:13 PM
Connect 1 on the potentiometer to ground. Connect 3 to +5 V (on the other side of theUSB-6009). Connect 2 to AI 0. Use Single ended mode.
Depending on your system and noise levels, connecting pin 4 to ground may help.
04-06-2012 07:23 PM
Thank you for your help, much appreciated.
Also, I have 3 more potentiometers, could you recommend a suitable 5V power supply to power the additional sensors?
04-07-2012 12:07 PM
The USB-6009 5 V output can supply up to 200 mA. It is unlikel that four potentiometers draw that much so just connect all of them to the +5 V.
The pin connections you showed in your image are for differential inputs. Refer to page 13 of the USB-6008_9 User Guide to see the single ended connections. Pin 2 is AI 0 for single ended (SE) and AI 0+ for differential. That is the one you will use. AI 0- is called AI 4 in SE mode.
You can use AI 1, AI 2, and AI 3 for the other potentiometers.
04-07-2012 06:20 PM
Thanks for your prompt reply. Excuse my lack of knowledge in this area.
How would I connect the single 5V supply output from the DAQ to four potentiometers?
Also is this the correct wiring as shown in pics?
1-4 correspond to connections on potentiometer.
04-07-2012 09:09 PM
It looks like you have it wired correctly. To connect the four devices you will need to connect all of the brown wires together and connect to ground. Similarly all the black wires need to be connected together and to +5 V.
The wires could be soldered together but that makes a permanent connection which may not be desirable. The are many kinds of terminal strips with screw terminals which are suitable for this kind of application. Wire nuts may also be used.
I recommend that you find a local person with some electrical or electronics experience to help you with these things. They are relatively simple, but not necessarily easy to explain to someone without much experience in the field.
The Yellow/Green wire is almost certainly connected to the metallic housing of the poteniometer and is intended to be used as a safety ground. If you have no power line circuits in the system to which the potentiometers are connected, it can be ignored. Otherwise consult a competent electrician or electrical engineer to be sure your system is safe and in compliance with your electric codes.
11-16-2012 11:29 AM
Hi Lynn and John,
I have a 6" linear potentiometer. I want to wire it. I read your discussion. I got benefit from it. Thank you. But I have a question:
The black wire is ground, What are the read and white wires? I am sure that one of them is the signal but which one?
Sorry, I am new to the field. I need help.