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71X Series
Calibration Manual
mA Loop Power Verification
1. While turning the Calibrator on, hold down both LOOP POWER keys (Zand O).
2. Release the keys.
3. Apply 1.2 kΩ to the mA jacks from the decade box or other resistor source. The
4. Press Oto turn the calibrator off.
Sensor Jack Verification
1. Make sure nothing is connected to the sensor port of the calibrator. Push Oto turn the
2. Change to a near zero value, similar to:
3. Plug the Fluke Pressure Module into the sensor port of the Fluke 719. The display
4. Disconnect the Fluke Pressure Module and press Oto turn the calibrator off.
The 719 verification test is now complete.
Calibration
Re-calibration (obtaining new cal-constants) is required only if a calibrator fails
verification. Always re-verify after a re-calibration.
Throughout this section, the 71X Calibrator may be referred to as the
"UUT" (unit under test).
Preparing for Calibration
To prepare for calibration, do the following:
1. Make sure fuse(s) in the UUT are intact. By referring to Table 38, you should not
2. Make sure you have the required test equipment available. (Refer to Table 39.)
3. Turn on and warm up the test equipment for the time required.
4. Allow UUT to come to ambient temperature. Turn it on and allow 5 minutes for
712 Calibration (V1.1 and Earlier)
Millivolts Measure
1. Hold down the
2. When the display momentarily shows CAL , release both the
48
The screen reads:
---------
LOOP mA
lower display should read over 19 mA but less than OL.
calibrator on. The display should read:
---------
0.000
should change to:
---------
After a short wait, a pressure value should appear on the display.
have to open the unit.
warm-up of the UUT.
R
and the
key.
This puts the 712 into Cal Mode. The 712 should display:
Note
C
key at the same time, then press and release the
O
R
and the
C
keys.
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