07-15-2015 10:32 PM
Hi,
I'm looking for an instrument such as a voltmeter that can measure voltage drop across two points. I would like it to have an output I can connect to my computer so that I can monitor the voltage on LabVIEW.
Can anyone recommend an instrument for me?
Thanks
07-16-2015 01:34 AM
Well, I have to get from point A to B, what do I need? Answers can range from
-jump!
-just walk!
-boat?
-car?
-plane?
-rocket?
distance? needed speed? payload?
Same with your voltage measurement, please give more information, that may increase the number of helpful answers 😉
Range can be from ~40$ to >40 000$
07-16-2015 02:05 AM
I need an instrument that can measure the voltage across two electrodes. The instrument and electrodes will be within a few meters of each other. The range of the instrument will be around +/- 20 V with a resolution of 1 mV. The price should preferably be less than $500.
Let me know if you need any more details.
07-16-2015 01:45 PM
How fast do you need to get the readings? Is there anything nearby (such as a speed-controlled motor or temperature-controlled oven) which might generate electrical interference? Does the instrument need a human-readable display or only computer interface? Do you have a preferred communications method to talk to the computer (Ethernet, RS-232, GPIB)? Do you already have any interface equipment to connect such communications methods to the computer?
Lynn
07-16-2015 02:00 PM
@johnsold wrote:
How fast do you need to get the readings? Is there anything nearby (such as a speed-controlled motor or temperature-controlled oven) which might generate electrical interference? Does the instrument need a human-readable display or only computer interface? Do you have a preferred communications method to talk to the computer (Ethernet, RS-232, GPIB)? Do you already have any interface equipment to connect such communications methods to the computer?
Lynn
I would like the unit to have a response time of less than 10 milliseconds. There is a small pump operating nearby. The instrument only needs a computer interface. I don't have a preferred communications method. The cheapest method is preferred. I do not have any interface equipment to connect to the computer.
07-16-2015 07:30 PM
OK. You probably should be looking at a 16-bit DAQ card or module. Most voltmeters, at least the inexpensive ones, have response times much longer than 10 ms at that resolution.
The USB-6002 and USB-6003 appear to meet the minimum specifications except for a maximum voltage range of +/-10 V. Not very many DAQ devices have higher ranges than that. You may need to put voltage dividers or other signal conditioners between your signal and the DAQ device.
Lynn
07-17-2015 05:26 PM
07-17-2015 05:53 PM
07-17-2015 05:59 PM