Verifying Normal Resistance - Keithley 2750 Service Manual

1-14 Performance Verification

Verifying normal resistance

Check the normal resistance function by connecting accurate resistance values to the
Model 2750 and verifying that its resistance readings are within the specified limits.
CAUTION
Follow these steps to verify resistance accuracy:
1.
2.
Figure 1-5
Connections for Model 2750 resistance verification (1 to 10M ranges)
Model 2750 Sense
Front Panel HI
SENSE
INPUT
Ω 4 WIRE
HI
350V
1000V
!
PEAK
PEAK
LO
500V
PEAK
INPUT
F R
FRONT/REAR
CAT I AMPS
3A, 250V
Sense
LO
Do not apply more than 1000V peak between front terminals INPUT HI
and LO or more than 350V peak between SENSE HI and LO, or instru-
ment damage could occur.
Using shielded, Teflon-insulated or equivalent cables in a 4-wire configuration,
connect the Model 2750 INPUT and SENSE jacks to the calibrator as shown in
Figure 1-5. Be sure the INPUTS switch is in the FRONT position.
Set the calibrator for 4-wire resistance with external sense on.
Input
HI
Output
HI
Input
Output
LO
LO
Note: Use shielded, low-thermal cables to minimize noise.
Model 2750 Multimeter/Switch System Service Manual
Sense
Resistance Calibrator
HI
Sense
LO
Enable or disable calibrator external sense as indicated
in procedure.