Pressure Measure - Fluke 71 Series Calibration Manual

71X Series
Calibration Manual

Pressure Measure

80
1.800.561.8187
The CHEC mode allows for a quick check of the calibration constants that have just
been stored. Changes to the applied current are shown in the display.
9. Push to continue. The lower display changes to:
rAnGE
The 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
(recharacterization) is performed in terms of PSI pressure units. Inputs using other
pressure units (kPa and bar, for example) must be mathematically converted.
1. Disconnect the test lead from the 718 Calibrator mA jacks and carefully attach the
pressure fitting of the deadweight tester to the Calibrator's pressure jack.
The use of TEFLON tape at the pressure fittings strengthens the seal.
The lower display shows rAnGE.
The upper display should show the full-scale range for the 718, for example:
•
For the 718 1G, upper display should show 1.
•
For the 718 100G, upper display should show 100.
2. After you check the proper range, push to continue.
3. Vent the system to ambient air to ensure 0.00 PSI or 0.000 PSI.
The lower display shows 0 PSI and the upper display shows the current reading.
When the unit is vented, the upper display will show 0.00 ± approximately10 % of
full scale.
4. When you push , the lower display shows the next pressure to apply.
5. Apply the requested pressure that shows on the lower display and when the upper
reading is stable, push .
6. Repeat this until lower display shows negative pressure.
7. Turn the pressure/vacuum switch to the vacuum position.
8. Apply requested negative pressure and push .
CHEC shows on the lower display.
The CHEC mode allows for a quick check of the calibration constants that have just
been stored. Changes to the applied pressure are shown on the display.
9. Push to continue. The 718 will restart in normal mode.
The 718 is now out of the Calibration mode and in the normal mode of operation.
10. Carefully vent all pressure, push to turn the 718 off. Disconnect all pressure
fittings.
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