Process Calibrators
Calibration
79
6. The CHEC mode allows for a quick check of the calibration constants that have just
been stored. Changes to the applied pressure reflect on the display. Push
to
continue. The unit will then reset power.
7. The 718 Calibrator is now out of the CAL mode and into the normal mode of
operation. Carefully vent all pressure, push to turn the calibrator off, and
disconnect all pressure fittings.
718 Calibration (V4.0 and Later)
mA Measure
1. Hold down both
and on the 718 Pressure Calibrator. Push and release .
The display shows CAL xxx, as long as
and are pushed. Where xxx is a
number, that tells you the number of times the 718 has been through the calibration
adjustment. When
and are released, PASS is shown.
2. A password is required to enter calibration mode. The password is 817. Enter the
most significant digit first. The password appears below PASS. Use to increase
the shown number, to decrease it. When the required digit is shown, push to
go to the next digit, or the password check. If the password entry was correct, the 718
will go to the CAL mode. If the password is incorrect, BAD PASS shows on the
display and the 718 returns to the normal operation mode.
In the CAL mode the upper display shows an uncalibrated reading. This reading is
approximately ± 10 % of full scale of the applied reading. When is pressed, the
calibration value is calculated relative to this reading.
The lower display shows what function and point is being calibrated.
In mA Measurement calibration mode, the 718 should show:
mA on the upper display
and
CAL 0 mA on the lower display.
3. Connect the test leads from the AUX jacks of the Fluke 5520A to the mA jacks on
the 718 Calibrator (black to black and red to red).
4. Set the Fluke 5520A to 0.00000 mA.
When 0.0 mA is sourced from the 5520A the upper display shows approximately
0.000 mA. When is pushed, the unit establishes the calibration constant for that
point and the lower display changes to CAL 12 mA. The upper display still shows
the applied current so it does not change until after 12 mA is applied.
5. Set the Fluke 5520A to 12.0000 mA. The upper display reads approximately
12.000 mA.
6. Push on the 718.
When 12.000 mA is sourced from the 5520A, the upper display shows approximately
24.000 mA. When is pushed, the unit establishes the calibration constant for
that point and the lower display changes to CAL 24 mA. The upper display still
shows the applied current so it does not change until after 24 mA is applied.
7. Set the Fluke 5520A to 24.0000 mA.
The upper display shows approximately 24.000 mA.
8. Push on the 718.
CHEC appears on the lower display
.
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