Keithley 2750 Service Manual

Model 2750 Multimeter/Switch System Service Manual Calibration 2-11
Model 2750 Calibration
DC current calibration
After the 1M resistance point has been calibrated, the unit will prompt you to apply
10mA. Follow these steps for DC current calibration:
1. Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2750
as shown in Figure 2-3.
Figure 2-3
Connections for DC and AC amps calibration
2. Calibrate each current step summarized in Table 2-5. For each step:
• Set the calibrator to the indicated DC current, and make sure the unit is in
OPERATE.
• Make sure the Model 2750 display indicates the correct calibration current.
• Press ENTER to complete each step.
• Allow the Model 2750 to finish each step.
NOTE If you are performing DC-only calibration, proceed to “Setting calibration
dates and saving calibration.”
Tab le 2- 5
DC current calibration summary
Calibration Step Calibrator Current Allowable Range
10mA
100mA
1A
10.00000mA
100.0000mA
1.000000A
9mA to 11mA
90mA to 110mA
0.9A to 1.1A
Input
LO
Amps
Output
LO
Output
HI
DC and AC Current Calibrator
Note: Be sure calibrator is set for normal current output.
!
F
500V
PEAK
FRONT/REAR
AMPS
HI
INPUT
LO
SENSE
Ω 4 WIRE
INPUT
350V
PEAK
1000V
PEAK
R
CAT I
3A, 250V
Model 2750
Front Panel

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