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Offset on 2520

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Enrique
Posts: 14
Joined: January 22nd, 2014, 3:18 am
Country: Spain

Offset on 2520

Post by Enrique » February 11th, 2014, 12:23 am

Hi,

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.

Thanks

Norbert W
Keithley Applications
Keithley Applications
Posts: 227
Joined: October 21st, 2010, 7:18 am
Country: Germany

Re: Offset on 2520

Post by Norbert W » February 11th, 2014, 1:18 am

Hello,

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.

Enrique
Posts: 14
Joined: January 22nd, 2014, 3:18 am
Country: Spain

Re: Offset on 2520

Post by Enrique » February 11th, 2014, 2:42 am

Does Keithley have any tool capable of producing pulses of current in the submicrosecond scale and with an offset in the micro Ampere scale?

Thanks.

Enrique

Norbert W
Keithley Applications
Keithley Applications
Posts: 227
Joined: October 21st, 2010, 7:18 am
Country: Germany

Re: Offset on 2520

Post by Norbert W » February 13th, 2014, 6:18 am

Considering your pulse width and offset requirements and
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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