Keithley 2635 Reference Manual

2600S-901-01 Rev. C / January 2008 Return to Section Topics 15-11
Series 2600 System SourceMeter® Instruments Reference Manual Section 15: Performance Verification
Model 2635/2636 output current accuracy 1nA to 100nA ranges
A suitably guarded and characterized 1 Gohm resistance standard, such as Keithley's
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 2600-STD-RES. The general process entails measuring the voltage across the
characterized 1Gohm resistor for a given output current and comparing the derived current to the
current accuracy of Table 15-8 for each current range.
1. Connect the guarded resistance standard to the 2635/2636 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 1nA to 100nA ranges listed in
Table 15-8 (Model 2635/2636).

Keithley 2635 Specifications

General

Brand	Keithley
Model	2635
Category	Measuring Instruments
Language	English