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One way to determine the output impedance of the 2400 series in current mode is from the Load Regulation specification, which states "0.01% + 100 pA" which is theregulation 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 GigohmsMinimum output resistance calculated as above for each range is listed in the table below. The table below also lists the estimated Voltage Source Output Resistance for each range. This represents the most likely values , NOT guaranteed values.
Current Source / Measure RangeVoltage Source Output ResistanceCurrent Source Output Resistance1.00000 礎8.00E-011.00E+1210.0000 礎8.00E-022.00E+11100.000 礎8.00E-032.00E+101.00000 mA8.00E-042.00E+0910.0000 mA8.00E-052.00E+08100.000 mA8.00E-062.00E+071.00000 A8.00E-082.00E+05 OHMS OHMS
Measured Output impedance
You can also MEASURE the output resistance of a given instrument in a similar way. For example we made the following measurement on the 100 microampere range. With the output set to 100 microamps and the compliance set to 105 volts and a load of 1 Megohm, the current read 99.997 uA, and the output Voltage read 100 Volts.When we shorted the 1 Mohm load the current increased to 99.998 uA.The output resistance is then calculated as delta Vo / delta I, where delta Vo is 100 volts and delta I is 1 nA (i.e. 99.998-99.997 uA) . This gives an output resistance of1E11 ohms, or 100 Gigohms for this range. But the calculation from the load regulation spec is the more conservative approach.
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