Keithley 2182, Руководство по обслуживанию, Страница: 39 / 120

Precalibration
1. Connect the calibrator to CHANNEL 1 of the Model 2182 input jack using the low-
thermal cable, as shown in
Figure 2-3 . Wait two minutes to allow for thermal equilibrium
before proceeding. (See Table 2-3 for Model 2107 cable connections.)
2. Set the calibrator to output DC volts, and turn external sense off.
Figure 2-3
Connections for factory DC volts calibration
NOTE Keep drafts away from low-thermal connections to avoid thermal drift, which could
affect calibration accuracy.
3. Perform the precalibration steps summarized in Table 2-7 . For each step:
• Set the calibrator to the indicated voltage, and make sure the unit is in operate.
• Allow the signal voltage to settle.
• Send the indicated programming command.
• Wait until the Model 2182 completes each step before continuing.
NOTE Keep the calibrator locked to the 11V range.
Table 2-7
Remote precalibration steps
Precalibration step Calibrator voltage Calibration command
10V 10.000000V :CAL:PROT:PCAL:STEP0 10
0V 0.0000000V :CAL:PROT:PCAL:STEP1 0
1V 1.0000000V :CAL:PROT:PCAL:STEP2 1
!
CHANNEL 1
CHANNEL 2
Model 2182
2107 Low
Thermal Cable
OUTPUT LO
Red (CH1)
Green (CH2)
OUTPUT HI
Black (CH1)
White (CH2)
DC Voltage Calibrator
2-14 Calibration