189II/AN
Service Manual
22
Table 4. 189II/AN Performance Test Steps (cont.)
Display Reading
[1]
Step Function Range
Input
Level
Frequency
or Model
Lower
Limit
Upper
Limit
Connect 5520A, Auxiliary 20A output, to Meter’s A and COM Input Terminals
55
AAC
5.0000 A
5 A
1 kHz
4.9580
5.0420
56
AAC
10.000 A
5 A
1 kHz
4.955
5.045
57
ADC
5.0000 A
5 A
4.9840
5.0160
58
ADC
10.000 A
10 A
9.968
10.032
[1]
Must allow for source and Meter settling before recording reading.
[2]
When using the relative mode (REL
Δ
) to compensate for offsets.
[3]
With a film capacitor or better, using relative mode (REL
Δ
) to zero residual.
[4]
Test limits are mathematically guard banded to ensure performance, at 20 kHz and lower.
Calibration Adjustment
Perform the Calibration Adjustment Procedure when the Meter fails any performance test
steps listed in Table 4.
The Meter features closed-case calibration adjustment using known reference sources.
The Meter measures the applied reference source, calculates correction factors and stores
the correction factors in nonvolatile memory.
The following sections present the features and Meter pushbutton functions that can be
used during the Calibration Adjustment Procedure.
Before you begin the adjustment procedure, the Meter must be allowed to reach the
ambient temperature of the lab environment. Depending on temperature gradient, this
could take up to several hours.
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