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Measuring current at voltage higher than 200mV with 6430

Posted: July 23rd, 2014, 9:15 pm
by jasongo
I am trying to measure low current less than - amp under 0.7V applied. So I use Keithely 6430 for both sourcing voltage and measuring current. However, it measured ~1 micro amp at 0.3V and ~10micro amp at 0.4V even though two ends of cable is open. . I got ~0.5pA and ~0.3pA for 0.2 and 0.1V, respectively, which I think more or less acceptable. Is there anyway to solve this problem?

If 6430 is not designed for such a experiment, I can try separate voltage source and current measurement by adding another Keithely (we have another Keithely 2400) as a voltage source. Do you recommend this way?

Re: Measuring current at voltage higher than 200mV with 6430

Posted: August 15th, 2014, 8:16 am
by Dale C
The Model 6430 makes measurement from the remote preamp. The IN/OUT HI triax connector should be used.
The inner conductor and outer shield of the IN/OUT HI connector should be used.
So connect a resistor between the inner conductor and outer shield (red and green alligator clips).
Then source the current or voltage and read the voltage or current.
Also, is the CMPL or uA,mA or mV or V light blinking?
If so, then the unit is in compliance.
If CMPL is blinking then it is in real compliance.
If uA, mA or mV, V is blinking then it is in range compliance.
If in range compliance the measurement range is too small for the measurement.