Keithley 2750 Service Manual

Model 2750 Multimeter/Switch System Service Manual Performance Verification 1-15
2750 Verification
3. Select the Model 2750 4-wire resistance function by pressing the 4 key, then
choose the SLOW integration rate with the RATE key.
4. Set the Model 2750 for the 1 range, and make sure the FILTER is on. Enable
OCOMP (offset-compensated ohms) by pressing SHIFT then OCOMP. (Use
OCOMP for 1, 10, and 100 range verification.)
5. Recalculate reading limits based on actual calibrator resistance values.
6. Source the nominal full-scale resistance values for the 1-10M ranges summa-
rized in Table 1-6, and verify that the readings are within calculated limits.
7. Connect the Model 2750 INPUT and SENSE jacks to the calibrator as shown in
Figure 1-6.
8. Disable external sense on the calibrator.
9. Set the Model 2750 for the 100M range.
10. Source a nominal 100M resistance value and verify that the reading is within cal-
culated limits for the 100M range.
Figure 1-6
Connections for Model 2750 resistance verification (100M range)
Input
HI
Input
LO
Output
LO
Output
HI
Calibrator (Output 2-wire Resistance)
Note: Use shielded cables to minimize noise.
Disable calibrator external sense mode.
Sense
LO
Sense
HI
!
F
500V
PEAK
FRONT/REAR
AMPS
HI
INPUT
LO
SENSE
Ω 4 WIRE
INPUT
350V
PEAK
1000V
PEAK
R
CAT I
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