Erasing Calibration Memory; Tolerance Check - Fluke 8842A Instruction Manual

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8842A
Instruction Manual
1. If you just completed the Offset and Gain or High-Frequency AC Calibration for an
2. If you just calibrated an individually selected range, pressing another range button
3. You can use the RATE button to verify the calibration at other reading rates.
It is still possible to erase the calibration memory while the
8842A is taking verification readings.

6-19. ERASING CALIBRATION MEMORY

The 8842A allows you to erase some or all of the correction constants stored in
calibration memory (U220). It is recommended that you erase the entire calibration
memory before beginning calibration if the calibration memory is replaced or
accidentally altered. The capability of erasing particular parts of the memory is mainly
intended as a troubleshooting aid to the technician.
Once the calibration memory is erased, the 8842A must be
recalibrated.
To erase all or part of the calibration memory, proceed as follows:
1. Press the front panel ERASE button. The display should show the erase prompt "cl"
2. To complete an erasure, press one of the following buttons within 1-1/2 seconds of
3. After an erasure is finished (a complete erasure takes about 3 seconds), the 8842A

6-20. TOLERANCE CHECK

The 8842A automatically checks that the reference input is near the value prompted. This
minimizes common errors such as applying a reference source with the wrong sign. If the
reference input exceeds the tolerances shown in Table 6-13, the 8842A displays ERROR
41.
6-18
entire function (not just one range), the range buttons can be used to change ranges in
order to verify all ranges were calibrated correctly.
begins the Offset and Gain Calibration procedure for the new range.
(for "clear"). If you do not press another button within 1-1/2 seconds, the 8842A
returns to its previous state.
pressing the ERASE button:
a. STORE -- Erases the entire memory.
b. A/D -- Erases the A/D Calibration constants
c. Any function button -- Erases the Offset and Gain Calibration constants for all
ranges of that function.
d. HF AC -- Erases the High-Frequency AC Calibration constants.
returns to one of the following states:
a. After complete erasure: Begins A/D Calibration.
b. After A/D erasure: Begins A/D Calibration.
c. After Offset and Gain erasure: Begins Offset and Gain Calibration for erased
function.
d. After High-Frequency AC erasure: Begins High-Frequency AC Calibration.
CAUTION
CAUTION

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