Measurement of resistance by USB 6009

[Meysam]

I want to measure the resistance of 4 varying resistance by USB6009. When I choose "Resistance" in DAQ assistance it shows a unrelated values for the resistances. Is there any method to connect resistances and measure them?

Thanks 

[Tom__Sedlack]

The 6009 (and all DAQ module/boards as far as I know) only measure voltage.  You can measure resistance by applying a know current through the resistor and measure the voltage drop and calculate the resistance.  You can also do a voltage divider with a know resistor in series and measure the voltage drops to calculate the unknown resistance.

[Brandon_B]

Hello,

You may also want to look into the USB-4065, which is capable of taking resistance measurements.

Regards,

[Meysam]

Thanks for the suggestions.

It seems that USB6009 can only apply and measure Voltage. Therefore, I am trying to use voltage divider to measure resistance. Is there any other method to measure resistance with USB6009?

Unfortunately, at this point I cannot buy another device.

Thanks,

Meysam 

[Henrik_Volkers]

As already written, you can use

a voltage divider

a bridge 

a current source ( 1k and a BF245 makes about 1mA )

use the R in RC timer and measure the frequency

... the more important questions are :

application?

range?

uncertaincy? 

[AnalogKid2DigitalMan]

Depending on the values of resistance you need to measure, you may need to take into account that the analog input resistance is about 144Kohms. This may affect your results.

-AK2DM