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I am testing the model 2520 with an 200 Ohm resistance.
I have used regular BNC cables with crocodile termination. I have connected the resistance to the Hi and Lo source of current pulses. I have used another BNC cable to measure the drop of voltage in the resistance in a regular Oscilloscope.
I always detect an offset of at least 0.5V. Do you know where is this offset coming from?
I have read in the manual that there is always some offset current but is negligible, However that offset seems too much for me.
the 500 mA range has an offset current spec of 0.45 mA. With a load of 200 Ohm this may result in an offset voltage up to 0.09 V.
In the 1A / 5A ranges this level could be 10 times as high - theoretically as these ranges will not fit your 200 Ohm load.
Not sure if you are using DC or short pulses for your measurements.
I would recommend to start with DC and check the levels. When additionally checking pulses I would recommend to use a low inductance resistor
(not wirewound) and the delivered low inductance ('blue') cables.
Depending on the results you may want to adjust cabling, ask for adjustment / calibration or worst case repair.
keeping in mind you mentioned a resistive load of 200 Ohms
you might widen you selection while looking at a function generator like
the model 3390.
Applicability here depends on the known constant resistive load so a
50 Ohm voltage pulser could be of some interest.
If the above makes sense please have a look at:
http://www.keithley.com/support/keidoc_ ... cification
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