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Calibration Manual
20
Table 4. 287/289 Performance Test Steps (cont.)
Display Reading
[1]
Step Function Range Input Level
Frequency
or Model
Lower
Limit
Upper
Limit
52 μA DC 5000.0 μA 5000 μA 4996.0 5004.0
53 mA AC 50.000 mA 4 mA 20 Hz 3.940 4.060
54 mA AC 50.000 mA 30 mA 30 kHz 29.375
[5]
30.625
[5]
55 mA AC 400.00 mA 300 mA 30 kHz 284.60 315.40
56 mA AC 400.00 mA 400 mA 60 Hz 397.55 402.45
57 mA DC 50.000 mA 0.1 mA 0.090 0.110
58 mA DC 50.000 mA 50 mA 49.965 50.035
59 mA DC 400.00 mA 400 mA 399.38 400.62
Connect 5520A, Auxiliary 20A output, to Meter’s A and COM Input Terminals
60 AAC 5.0000 A 5 A 1 kHz 4.9580 5.0420
61 AAC 10.000 A 5 A 1 kHz 4.955 5.045
62 ADC 5.0000 A 5 A 4.9840 5.0160
63 ADC 10.000 A 10 A 9.968 10.032
Connect 5520A Normal Output to Meter’s V Input Terminal
64 LoZ (289)
[6]
1000 V 120 V
[7]
60 Hz 113.6 126.4
[1] Must allow for source and Meter settling before recording reading.
[2] When using the relative mode (RELΔ) to compensate for offsets.
[3] The Meter accuracy is not specified at this frequency with Low-pass filter on. The display reading limits shown in table 4, checks
that the Low-pass filter is active and follows an expected roll-off curve.
[4] With a film capacitor or better, using relative mode (REL Δ) to zero residual.
[5] Test limits are mathematically guard banded to ensure performance, at 20 kHz and lower.
[6] To obtain full accuracy in DC mV, Temperature, ohms, and LoΩ, let the Meter stabilize for 20 minutes after using LoZ.
[7] To avoid calibrator overload/current limit condition, step the calibrator output to 60 V and then 120 V.
Calibration Adjustment
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.
Perform the Calibration Adjustment Procedure should the Meter fail any performance test
steps listed in Table 4.
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