Keithley 630 Instruction Manual page 24

MODEL 630 POTh'NTIOMETRIC ELECTROMETER
CALIBRATION
SECTION 5. CALIBRATION
5-1. GENERAL.
a.
The following procedures are recommended for calibrating the Model 630.
Use the
equipment recommended in Table 5.
If proper facilities - especially important for cal-
ibrating an fO.Ol% instrument
- are not available or if difficulty is encountered, con-
tact Keithley Instruments, Inc., or its representative to arrange for factory calibration.
b. The following procedures are covered:
Kelvin-Varley divider verification, divider
calibrate adjustment,
voltage range calibration, reference voltage supply stability test
and oscillator adjustment.
c.
If the Model 630 is not within specifications after the calibration, follow the
troubleshooting procedures or contact Keithley Instruments, Inc., or its representative.
Instrument
Electra Scientific Industries Model SV194B
Use
Range voltage calibration
Voltage Calibrator, i-0.005% accuracy with
corrections on certificate
Electra Scientific Industries Model RV722
Decade Voltage Divider; terminal linearity
21 ppm; certificate corrected to kO.2 ppm
Electra Scientific Industries Model LC875B
Lead Compensator
Hewlett-Packard Model 200CD Oscillator
Keithley Instruments Model 15OB Microvolt
hmeter
Keithley Instruments Model 241 Regulated
High Voltage Supply
Keithley Instruments Model 662 Guarded dc
Differential Voltmeter
Keithley Instruments Model 370 Recorder
Tektronix Type 503 Oscilloscope
Weston Instruments Model 3 Type 7 Saturated
Standard cell
Weston Instruments Model 66 Oil Bath
Voltage divider for range calibration
Range voltage calibration
Monitor oscillator frequency
Null detector for range calibration
Voltage supply for range calibration
Check voltages in Kelvin-Varley divider
Recorder for reference voltage supply
stability
Check wave forms
Range calibration and reference voltage
supply stability
Range calibration end reference voltage
TABLE 5.
Equipment Recommended for Model 630 Calibration.
Use these instruments or their
equivalents.
1067R
21