I measure impedance with AD2, but I don't know where to put the reference resistor.

[Sangkyu Choi]

 

Hi! 

I'm going to measure impedance with AD2.

I used W1-C1-DUT-C2-R-GND.

I don't know is when measuring the circuit like below, I don't know if I should connect the reference resistor to GND or scope2(V-).

Which of the 2 methods is correct?

 

 

 

 

 

[Anthocyanina]

there is a connection diagram  this shows how to connect it, 1+ and 2+ are the scope channels, w1 is the generator output, and you see 1-, 2- (the negative of the scope channels) and ground are tied together

[attila]

Hi @Sangkyu Choi

The negative oscilloscope inputs must always be connected to gnd, unless otherwise indicated, they are not used for differential measurements.

[Sangkyu Choi]

On 4/14/2023 at 3:41 PM, Anthocyanina said:

there is a connection diagram  this shows how to connect it, 1+ and 2+ are the scope channels, w1 is the generator output, and you see 1-, 2- (the negative of the scope channels) and ground are tied together

On 4/14/2023 at 6:46 PM, attila said:

Hi @Sangkyu Choi

The negative oscilloscope inputs must always be connected to gnd, unless otherwise indicated, they are not used for differential measurements.

Thank you!

I'm sorry, I think I explained it wrong.

Connectd is

V+ is ch1+

v- is ch2+

ch1-, ch2- gnd

The resistance I want to measure is 1 kohm, so 1 kohm should come out when measuring impedance. However, the impedance measurement in two ways did not produce 1 kohm. Can you tell me what the problem is?

 

 

 

Edited April 17, 2023 by Sangkyu Choi

[attila]

Hi @Sangkyu Choi

This is what I measure on a 1k 5% (DUT) with IA adapter which uses the same DUT-ReferenceResistor setup: