Service & Calibration Page 85 of 85
4.3.10 Ground Continuity Calibration
GC 5
Ω
ΩΩ
Ω
Offset (1
Ω
ΩΩ
Ω
)
Connect a 1
Ω
load resistor between the Sentry Plus instrument’s rear panel RTN/LOW terminal
and Ground Continuity Option terminal.
Press [F1] = UP to go to Cal Step 21: ‘GC 5
Ω
Offset (1
Ω
)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the Splus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “GC 5
Ω
Offset” display (incorporating the new cal value).
GC 5
Ω
ΩΩ
Ω
Full (3
Ω
ΩΩ
Ω
)
Connect a 3
Ω
load resistor between the Sentry Plus instrument’s rear panel RTN/LOW terminal
and Ground Continuity Option terminal.
Press [F1] = UP to go to Cal Step 22: ‘GC 5
Ω
Full (3
Ω
)’.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “GC 5
Ω
Full” display (incorporating the new cal value).
4.3.11 Contrast Calibration
This calibration step is by-passed. If setup is selected, the display contrast will be set to a level
of 7. Display contrast can be adjusted as specified in paragraph 2.15.2.1.
4.3.12 Finalize Calibration
When all calibration steps are complete:
Press [F4] = EXIT
Release the [CAL] enable switch to the OUT position using the tip of a small screwdriver.
1. Press [F2] = DOWN three times.
2. Press [F3] = SELECT
3. Display prompts: ‘PASSWORD’.
4. Press [A] [A] [A] [A] [ENTER]
5. Display prompts: ‘Select Software Calibration?’
6. Press [F1] = ON to set Calibration Values ON.
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