Keithley 630 Instruction Manual page 28

MODEL 630 POTENTIOMETRIC FLECTROMETER
CALIBRATION
FIGURE 11. Block Diagram for Model 630 Range Calibration. Fully guard the entire system
to
prevent leakage errors. See Table 5 for recommended equipment.
3.
50-volt Range Calibration: Set the Model 630 controls as follows:
DETECTOR INPUT Switch 1010 OHMS
RANGE Switch 50
Reference Voltage Dials 4'9.9 9 9 10
NULL Switch 10 Mv
POLARITY Switch +
Adjust the Voltage Calibrator to apply 50 volts dc to the Model 630. Adjust the 50 V
CAL potentiometer, R334 (Figure ZO), for an off-null reading on the Model 630 equal to
the correction factor at 50 volts.
4.
5-volt Range Calibration:
set the Model 630 controls as follows:
DETECTOR INPUT Switch
1010 OHMS
RANGE Switch
'5
Reference Voltage
Dials 4.9 9 9 9 10
NULL Switch 1Mv
POLARITY Switch +
Adjust the Voltage Calibrator to apply 5 volts dc to the Model 630. Adjust the 5 V CAL
potentiometer, R337 (Figure 2o), for an off-null reading on the Model 630 equal to the
correction factor at 5 volts.
5.
0.5~volt Range Calibration:
Set the Model 630 controls as follows:
DETECTOR INPUT Switch 1010 OHMS
RANGE Switch
0.5
Reference Voltage
Dials .4 9 9 9 9 10
NULL Switch
0.1 MV
POLARITY Switch +
1067~ 25