Keithley SourceMeter 2400, Service Manual, Page: 26 / 137

2400-902-01 (G - Feb 2006)
Model 2400 Service Manual 1-14
Performance Verification
4. Press MEAS
Ω
to select the ohms measurement function, and make sure the source out-
put is turned on.
5. Verify ohms measurement accuracy for each of the resistance values listed in Table 1-6.
For each measurement:
• Set the resistance calibrator output to the nominal resistance or closest available
value.
NOTE
It may not be possible to set the resistance calibrator to the specified value. Use the
closest possible setting, and modify reading limits accordingly.
• Select the appropriate ohms measurement range with the RANGE keys.
• Verify that the Model 2400 resistance reading is within the limits given in the
table.
6. Repeat the entire procedure using the rear panel INPUT/OUTPUT and 4-WIRE
SENSE jacks. Be sure to select the rear panel jacks with the front panel TERMINALS
key.
Table 1-6
Ohms measurement accuracy limits
Model 2400 range
Calibrator
resistance*
Model 2400 resistance reading limits**
(1 year, 18•C-28•C)
20
Ω
200
Ω
2k
Ω
20k
Ω
200k
Ω
2M
Ω
20M
Ω
200M
Ω
19
Ω
190
Ω
1.9k
Ω
19k
Ω
190k
Ω
1.9M
Ω
19M
Ω
100M
Ω
18.9780 to 19.0220
Ω
189.818 to 190.182
Ω
1.89837 to 1.90163k
Ω
18.9856 to 19.0144k
Ω
189.837 to 190.163k
Ω
1.89761 to 1.90239M
Ω
18.9781 to 19.0219M
Ω
99.330 to 100.670M
Ω
* * Nominal resistance value.
** Reading limits based on Model 2400 normal accuracy specifications and nominal resistance values. If
actual resistance values differ from nominal values shown, recalculate reading limits using actual calibrator
resistance values and Model 2400 normal accuracy specifications. See “Verification limits” earlier in this
section for details.