71X Series
Calibration Manual
70
reflects the applied current so it does not change until after step 6 when 24 mA is
applied."
6. Set the Fluke 5520A to 24.0000 mA.
7. The upper display reads approximately 24.000 mA. Press D on the 718 Calibrator.
CHEC appears on the lower display.
8. The CHEC mode allows for a quick check of the calibration constants that have just
been stored. Changes to the applied current are reflected in the display. Press D to
continue. The lower display changes to:
rAnGE
Pressure Measure
The 718 Pressure Calibrator has built-in temperature compensation. Instruments being
calibrated should be in a stable temperature environment for several minutes before
calibration. Calibration facilities should be maintained near 23 °C nominal.
Re-calibration (re-characterization) is performed in terms of ‘PSI’ pressure units. Inputs
using other pressure units (ie. kPa and bar) must be mathematically converted.
Note
For versions 3.00 and later, chas changed to a.
1. Remove two-wire test lead from the 718 Calibrator and carefully attach the pressure
fitting of the deadweight tester to the pressure jack on the 718 Calibrator.
Note
The use of TEFLON tape at the pressure fittings strengthens the seal.
2. The lower display shows rAnGE. This is an indication to choose the correct model of
the 718 Calibrator. Choose the correct range. The appropriate range for the 718 is as
follows:
718 1G (1)
718 30G (30)
718 100G (100)
718 300G (300)
For unit with V2.0 or less
, the upper display shows 30, which is the default pressure
range. Pressing
c changes the sensor range to 100 PSI, pressing h changes it back
to 30 PSI. For a≥ version 3.0 press ato uprange, hold to down range. Match the
displayed range to the measurement range of the 718.
3. After selecting the proper range, press D on the 718Ex Calibrator.
4. Vent the system to ambient air to ensure 0.00 PSI.
5. The lower display indicates C 0 PSI and the upper display indicates the current
reading. When the unit is vented (step 5) the upper display will read 0.00 +/-
approximately 10 % of full scale. When
D is pressed, the lower display indicates
the next pressure to apply. Apply the requested pressure that shows on the lower
display and when the upper reading is stable, press
D. Repeat this until CHEC
appears on the display.
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. Press
D to
continue. The unit will then reset power.
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