9. Repeat steps 4 through 6 for the 3 A range (Model 2601B, 2602B, or 2604B) or the 1.5 A range
(Model 2611B, 2612B, 2614B, 2634B, 2635B, or 2636B). Calculate the current from the DMM
voltage reading and the characterized 0.5 Ω resistance value: I=V/R.
10. For the Model 2602B, 2604B, 2612B, 2614B, 2634B, or 2636B, repeat the above procedure for
the other channel.
Model 2634B, 2635B, or 2636B current source accuracy 1 nA to 100 nA ranges
A suitably guarded and characterized 1 GΩ resistance standard, such as the Keithley Instruments
Model 2600-STD-RES is necessary for the following measurements. Step-by-step procedures and
connection diagrams for verifying the output current accuracy for the low current ranges are included
with the Model 2600-STD-RES. The general process entails (for each current range) measuring the
voltage across the characterized 1 GΩ resistor for a given output current and comparing the derived
current to the current accuracy listed in the table titled "Model 2634B, 2635B, or 2636B output current
accuracy limits."
1. Connect the guarded resistance standard to the 2634B, 2635B, or 2636B and the DMM.
2. Source the appropriate current for ± full-scale reading.
3. Wait 30 seconds for stable measurement.
4. Capture the reported voltage measurement.
5. Calculate the current from measured voltage and characterized resistance.
6. Verify output current accuracy for each of the currents for the 1 nA to 100 nA ranges listed in the
table titled "Model 2634B, 2635B, or 2636B output current accuracy limits."
Figure 129: Connections for 100 nA to 1 A current ranges
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