Keithley 2182, Руководство по обслуживанию, Страница: 16 / 120

Warm-up period
Allow the Model 2182 to warm up for at least 2-1/2 hours before conducting the verification
procedures. If the instrument has been subjected to temperature extremes (those outside the
ranges stated above), allow additional time for the instrument’s internal temperature to stabilize.
Typically, allow one extra hour to stabilize a unit that is 10°C (18°F) outside the specified
temperature range.
Also, allow the test equipment to warm up for the minimum time specified by the
manufacturer.
Line power
The Model 2182 requires a nominal line voltage of 100, 120, 220, or 240V and a line
frequency of 50 to 60Hz or 400Hz. Verification tests must be performed with the correct line
voltage. If necessary, change the line voltage setting as covered in
Section 3 .
Recommended test equipment
Table 1-1 summarizes recommended verification equipment. You can use alternate equip-
ment as long as that equipment has specifications at least four times better than corresponding
Model 2182 specifications. Keep in mind, however, that test equipment accuracy will add to the
uncertainty of each measurement.
Table 1-1
Recommended verification equipment
Description Manufacturer/Model Specifications*
DC Calibrator Fluke 5700A 100mV:
±
14ppm
1V:
±
7ppm
10V:
±
5ppm
100V:
±
7ppm
Low Thermal Divider 100:1 division: ±5ppm
Thermocouple Calibrator Omega CL523 Type J: -200 to 700°C
Type K, N : -200 to 1300°C
Type N: -200 to 400°C
Type E: -200 to 1000°C
Type R, S: 0 to 1700°C
Type B: 400 to 1700°C
Digital Multimeter Keithley 2000 1V:
±
32ppm
Low Thermal Cable Keithley 2107
Low Thermal Cable Keithley 1506
BNC-to-dual banana jack cable
*DC calibrator specifications shown include total 90-day 23°C ±5°C uncertainty at specified output.
Model 262 error includes a short-term transfer error of
±
5ppm at 23°C
±
1°C. Digital multimeter
specification is 90-day, 23°C ±5°C full-range value.
Performance Verification 1-3