Keithley 2015, Service Manual

Page: 44 / 158

Calibration 2-11
Resistance calibration
Completing the 100V DC calibration step ends the DC voltage calibration procedure. The
Model 2015 will then prompt you to connect 1k
Ω
. Follow these steps for resistance calibration:
1. Set the calibrator output for resistance, and turn on external sense.
NOTE Use external sense (4-wire
Ω
) when calibrating all resistance ranges. Be sure that the
calibrator external sense mode is turned on.
2. Perform the calibration steps summarized in Table 2-4. For each step:
• Set the calibrator to the indicated value, and place the unit in operate. (If the cali-
brator cannot output the exact resistance value, use the Model 2015 left and right
arrow keys and the range keys to adjust the Model 2015 display to agree with the
calibrator resistance.)
• Press the ENTER key to calibrate each point.
• Wait for the Model 2015 to complete each step before continuing.
Table 2-4
Ohms calibration summary
Calibration
step Calibrator
resistance*
Allowable range
1k
Ω
10k
Ω
100k
Ω
1M
Ω
1k
Ω
10k
Ω
100k
Ω
1M
Ω
0.9k
Ω
to 1.1k
Ω
9k
Ω
to 11k
Ω
90k
Ω
to 110k
Ω
0.9M
Ω
to 1.1M
Ω
* Nominal resistance. Adjust Model 2015 calibration
parameter to agree with actual value.