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[SOLVED]HP/AGILENT/KEYSIGHT 34401A 2W Ohm Problem

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coldframe:
a problem comes up

Hi,

It's all fine, except it's got a fault when measuring ohm with 2-wires again

For example.
I will get readings from 9.5 Ohms Value when Power On
But, Over time, Increase Ohm Value 10.7 Ohm
See attached.

*  When using 4-wires-measurement everything's alright.

Did anyone have that problem before?
Thank you

Coldframe

coldframe:
Hi, Dr. Frank

How about you?
A problem has been encountered while measuring the Ohm
(increasing steadily Ohm Value)
Where do you think the main problems occur?

I'd be happy to hear what your thoughts are on this matter.

Regards, coldFrame

robrenz:

--- Quote from: coldframe on February 17, 2014, 06:18:31 pm ---a problem comes up

Hi,

It's all fine, except it's got a fault when measuring ohm with 2-wires again

For example.
I will get readings from 9.5 Ohms Value when Power On
But, Over time, Increase Ohm Value 10.7 Ohm
See attached.

*  When using 4-wires-measurement everything's alright.

Did anyone have that problem before?
Thank you

Coldframe

--- End quote ---

You may just be seeing the TC of the resistor as it warms up from the drive current of the meter.

coldframe:

--- Quote from: robrenz on February 18, 2014, 12:14:34 pm ---You may just be seeing the TC of the resistor as it warms up from the drive current of the meter.

--- End quote ---

Hi, robrenz
What does the "TC" stand for?
Could you be more specific?

Thanx!

robrenz:
Temperature Coefficient.  In this case I implied TCR for Temperature Coefficient of resistance which is ppm change in resistance per degree change of resistor temperature.

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