Softkeys; Navigation Buttons; Mode Buttons; Description Of Calibration Adjustment Steps - Fluke 287 Calibration Manual

screen.
4. Calibration Step progress indicator.
5. Calibration status message. Usually blank, but displays one of the following
messages when the given condition occurs:
"Calibrating"... is shown while measurements are being made after Next is
pressed. All softkeys except for ABORT are disabled during this time.
An error message is shown if the rotary switch is in an incorrect position for the
present step.
An error message is shown if the source jacks are in an incorrect position for the
present step.

Softkeys

Table 6 describes the Meter's softkey functions during the calibration adjustment routine.
Key Function
F1 Next Used to go to next calibration step if present reading is validated. Otherwise shows
error message if invalid measurement. Disabled during calibration computation or
with an error message
F4 Abort Return to Measurement Screen without changing stored calibration constants. This
softkey is always available during the calibration procedure.

Navigation Buttons

The UP and DOWN Arrow buttons can be used to adjust display contrast while in the
calibration mode. The RIGHT and LEFT Arrow buttons are disabled.

Mode Buttons

The mode buttons (H, M, R, and I) are disabled during calibration
adjustment.

Description of Calibration Adjustment Steps

The general calibration procedure is as follows:
1. Move the rotary switch to the function that you are calibrating as indicated by the
calibration procedure.
2. Apply the source value indicated by the secondary display.
3. Wait for the measurement on the primary display to settle to its final value. There is
no internal control or wait time. It is up to the user to determine that the measurement
is settled.
4. Press the NEXT softkey to calculate calibration constants for the current step. During
calculation of calibration constants the secondary display will show Calibrating....
Some calibration measurements take longer to execute than others (up to 115
seconds). If the measurement is within calibration tolerance the Meter records the
new constant(s) and proceeds to the next calibration step, giving a single beep to
prompt the user to proceed.
The frequency value for AC functions will not be validated.
Table 6. Softkey Functions during Calibration
Note
Description
True-rms Digital Multimeters
Calibration Adjustment
23