Keithley SourceMeter 3A 2420, Руководство по обслуживанию

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Performance Verification 1-3
Line power
The Model 2420 requires a line voltage of 90 to 250V and a line frequency of 50 to 60Hz.
Verification tests must be performed within this range.
Recommended test equipment
Table 1-1 summarizes recommended verification equipment. You can use alternate equipment
as long as that equipment has specifications at least as good as those listed in Table 1-1. Keep in
mind, however, that test equipment uncertainty will add to the uncertainty of each measurement.
Generally, test equipment uncertainty should be at least four times better than corresponding Model
2420 specifications. Table 1-1 lists the specifications of the recommended test equipment, includ-
ing maximum allowable uncertainty for alternate test equipment, which is shown in parentheses.
* 90-day, full-range accuracy specifications of ranges required for various measurement points.
** 90-day, ±5°C specifications of nominal resistance values shown. Use actual values for tests. Maximum uncertainty of
alternate test equipment shown in parentheses.
*** Required for verification of 3A current range. Characterize resistor to ±300ppm or better using recommended DMM
before verifying 3A current measurement range.
Table 1-1
Recommended verification equipment
Description Manufacturer/Model Specifications
Digital Multimeter Hewlett Packard
HP3458A DC Voltage* 1V:
10V:
100V: ±5.6ppm
±4.3ppm
±6.3ppm
DC Current* 10
µ
A:
100
µ
A:
1mA:
10mA:
100mA:
1A:
±25ppm
±23ppm
±20ppm
±20ppm
±35ppm
±110ppm
Resistance Calibrator Fluke 5450A Resistance** 1.9
Ω
:
19
Ω
:
190
Ω
:
1.9k
Ω
:
19k
Ω
:
190k
Ω
:
1.9M
Ω
:
19M
Ω
:
±65ppm (±460ppm)
±23ppm (±280ppm)
±10.5ppm (±230ppm)
±8ppm (±200ppm)
±7.5ppm (±195ppm)
±8.5ppm (±200ppm)
±11.5ppm (±180ppm)
±30ppm (±635ppm)
Precision Resistor*** Isotec RUG-Z-1R00-0.1 1
Ω
, ±0.1%, 100W