Keithley 2601 Reference Manual

2600S-901-01 Rev. C / January 2008 Return to Section Topics 15-15
Series 2600 System SourceMeter® Instruments Reference Manual Section 15: Performance Verification
Model 2635/2636 current measurement accuracy 100pA to 100nA ranges
A suitably guarded and characterized 1 GΩ 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 current measurement accuracy for the low current ranges are included
with the 2600-STD-RES. The general process entails forcing a characterized voltage across the
1Gohm resistor and comparing the 2636/2636 measured results against the standard resistance
and voltage derived current.
1. Characterize the appropriate +/- V source values with the DMM according to Table 15-9.
Table 15-9
Model 2635/2636 Characterization of Voltage Source settings
Low Current Range Voltage Source Compliance
100 pA +/- 100.00 mV 1.5 A
1 nA +/- 1.0000 V 1.5 A
10 nA +/- 10.000 V 1.5 A
100 nA +/- 100.00 V 100 mA
2. Characterize the desired 2635/2636 current ranges.
a. Connect guarded resistance standard.
b. Source the appropriate voltage for +/- full scale reading.
c. Wait 30 seconds for stable measurement.
d. Capture the 2635/2636 reported current measurement.
e. Verify output current accuracy for each of the currents for the 100pA to 100nA ranges
listed in
Table 15-12 (Model 2635/2636).
Table 15-10
Model 2601/2602 current measurement accuracy limits
Model 2601/2602
source and
measure range
1
Source
current
2
Model 2601/2602 current reading limits
(1 year, 18C–28C)
100nA
1µA
10µA
100µA
1mA
10mA
100mA
1A
3A
90.000nA
0.9000µA
9.0000µA
90.000µA
0.9000mA
9.0000mA
90.000mA
0.90000A
2.4000A
89.855 to 90.145nA
0.899475 to 0.900525µA
8.99625 to 9.00375µA
89.957 to 90.043µA
0.89962 to 0.90038mA
8.9957 to 9.0043mA
89.962 to 90.038mA
0.89823 to 0.90177A
2.3953 to 2.4047A
1. Measure range coupled to source range when simultaneously sourcing and measuring
current.
2. As measured by precision digital multimeter. Use closest possible value, and modify reading
limits accordingly if necessary.

Keithley 2601 Specifications

General

Brand	Keithley
Model	2601
Category	Measuring Instruments
Language	English