Keithley 2750 Service Manual

2-10 Calibration Model 2750 Multimeter/Switch System Service Manual
Resistance calibration
Completing the 100V DC calibration step ends the DC voltage calibration procedure. The
Model 2750 will then prompt you to connect 100. Follow these steps for resistance
calibration:
1. Set the calibrator output for resistance, and turn on external sense.
NOTE Use external sense (4-wire ) 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
calibrator cannot output the exact resistance value, use the Model 2750 left
and right arrow keys and the range keys to adjust the Model 2750 display to
agree with the actual calibrator resistance.)
• Press the ENTER key to calibrate each point.
• Wait for the Model 2750 to complete each step before continuing.
Tab le 2- 4
Ohms calibration summary
Calibration Step Calibrator Resistance* Allowable Range
100
10k
100k
1M
100
10k
100k
1M
90 to 110
9k to 11k
90k to 110k
0.9M to 1.1M
*Nominal resistance. Adjust Model 2750 calibration parameter to agree with actual value.

Keithley 2750 Specifications

General

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A