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Internal Resistance of SMU 2400

Models 2400, 2401, 2410, 2420, 2425, 2430, 2440, 6430
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skysdj77
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Joined: May 2nd, 2011, 4:45 am
Country: South Korea

Internal Resistance of SMU 2400

Post by skysdj77 » May 2nd, 2011, 4:53 am

Hi. I am using sourcemeter 2400. By using this device, i measured current and voltage of cell.
As methodology, I apply current and measure voltage by using sourcemeter 2400(Bias current).
(Also multimeter 2000 is connected with sourcemeter and cell to measure current that flow in the circuit.)

However I am not sure my results because of internal resistance of devices. And I could not find any information about internal resistance of devices(SMU 2400 and DMM2000). Could you let me know internal resistance of sourcemeter 2400 when I apply current and measure voltage(Bias current) and that of multimeter 2000 as ammeter?

Please reply the answers.Thanks ~

Dale C
Keithley Applications
Keithley Applications
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Joined: June 10th, 2010, 6:22 am
Country: United States
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Re: Internal Resistance of SMU 2400

Post by Dale C » May 6th, 2011, 1:10 pm

Model 2000 internal resistance on voltage is 10G ohms on the 100mV, 1V and 10V ranges.
Model 2000 internal resistance on voltage is 10M on the 100V and 1000Vranges.
Model 2000 internal shunt for current has a 0.1 Ohm for 3A, 1A and 100mA. 10 Ohm for 10 mA range.

Model 2400 voltage measure mode has an internal resistance of 10G ohms all ranges.
Model 2400 current source mode has and internal resistance....
The specified output impedance of the SourceMeter series in current mode is determined from the Load Regulation specification, which states "0.01% + 100 pA" which is the regulation from no load to full load, i.e. full volts( 200 V, most ranges) to no volts:
The output resistance is calculated as delta Vo / delta I
For the 100 uA range, for example, 0.01% of range + 100 pA equals 10.1 nA, so the Minimum Output Impedance is 200V / 10.1nA, or about 20 Gigohms.
This represents the most likely value , but NOT the guaranteed value.

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