Performance Test and Calibration
Adjustment (Calibration) 3
3-25
Table 3-17. 8845A AC Current Verification Steps
Nominal Output 90-day Test Limits 1-year Test Limits
Ampl Freq
Range
High Low High Low
10.0 mA
[1]
10 Hz 10.0 mA 10.014 mA 9.986 mA 10.014 mA 9.986 mA
10.0 mA 1 kHz 10.0 mA 10.014 mA 9.986 mA 10.014 mA 9.986 mA
10.0 mA
[1]
5 kHz 10.0 mA 10.014 mA 9.986 mA 10.014 mA 9.986 mA
10.0 mA
[1]
10 kHz 10.0 mA 10.045 mA 9.955 mA 10.045 mA 9.955 mA
100.0 mA
[1]
10 Hz 100.0 mA 100.14 mA 99.86 mA 100.14 mA 99.86 mA
100.0 mA 1 kHz 100.0 mA 100.14 mA 99.86 mA 100.14 mA 99.86 mA
100.0 mA
[1]
5 kHz 100.0 mA 100.14 mA 99.86 mA 100.14 mA 99.86 mA
100.0 mA
[1]
10 kHz 100.0 mA 100.45 mA 99.55 mA 100.45 mA 99.55 mA
1 A
[1]
45 Hz 1 A 1.0014 A 998.6 mA 1.00140 A 998.6 mA
1 A 1 kHz 1 A 1.0014 A 998.6 mA 1.00140 A 998.6 mA
1 A
[1]
5 kHz 1 A 1.0014 A 998.6 mA 1.00140 A 998.6 mA
1 A
[1]
10 kHz 1 A 1.0105 A 989.5 mA 1.01050 A 989.5 mA
1.9 A
[1]
45 Hz 3 A 1.90465 A 1.89535 1.90465 A 1.89535 A
1.9 A 1 kHz 3 A 1.90465 A 1.89630 1.90465 A 1.89535 A
1.9 A
[1]
10 kHz 3 A 1.92765 A 1.87235 1.92765 A 1.87235 A
10 A
[1]
45 Hz 10 A 10.01900 A 9.98100 A 10.02100 A 9.97900 A
10 A 1 kHz 10 A 10.01900 A 9.98100 A 10.02100 A 9.97900 A
Notes:
[1] Optional test
Adjustment (Calibration)
Meter adjustments, or calibration, should be performed at the desired interval, or
whenever a verification test indicates a Meter function is out of tolerance. The Meter
accuracy will stay within specifications only if the adjustment procedure is performed at
regular intervals. A one-year interval is adequate for most applications. The Meter’s
accuracy specifications are not valid beyond the one-year interval.
Meter adjustments are accessed only through the remote interface with a series of
adjustment steps. The remote program directs the test equipment to apply a series of
shorts, opens, voltages, currents, and capacitance (8846A only) to the Meter. At each
step, the Meter internally makes the necessary adjustment to bring the Meter into
specification. No internal mechanical adjustments are necessary.
Using an automated, computer-controlled procedure, the calibration and verification
procedures can be performed on the Meter in under 60 minutes. A sample adjustment
program is listed on the “Sample Adjustment Program” section later in this manual. A
MetCal program is available at
www.fluke.com to adjust the Meter.
The Meter’s adjustments are password protected to prevent accidental or unauthorized
adjustments. The security password must be entered through the front panel or remote
interface before adjustments can be made to the Meter.
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