Verification; Preparing For Verification; 712 Verification (V1.1 And Earlier); Resistance Measure Verification - Fluke 712 Calibration Manual

Verification

The following verification tests check the accuracy of each calibrator function against the
calibrator's specifications. If the calibrator fails any of these tests, calibration adjustment
or repair is required. Fluke recommends that you calibrate your 71X Calibrator once a
year to ensure that it performs according to its specifications.
To perform the verification tests, it is not necessary to open the case or adjust the
calibrator. Simply make the required connections, apply the designated source stimulus
and determine if the measurements fall within the acceptable range indicated.
Throughout this section, the 71X Calibrator may be referred to as the
"UUT" (unit under test).

Preparing for Verification

To prepare for verification, do the following:
1. Make sure fuse(s) in the UUT are intact. By referring to Table 33, you should not
have to open the unit.
2. Make sure you have the required test equipment available. (Refer to Table 34.)
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
warm-up of the UUT.

712 Verification (V1.1 and Earlier)

Resistance Measure Verification

1. Press the green
display indicates:
INPUT TYPE R 4W
2. Configure the 712 Calibrator into a 4-wire ohms measurement:
•
Connect two test leads from the NORMAL jacks of the 5520A to the INPUT
jacks (two middle jacks) on the 712 Calibrator (black to black, red to red).
•
Connect two additional test leads, also from the NORMAL jacks of the 5520A,
to the 712 Calibrator (black wire to the 712 red jack labeled [3W NC] and red
wire to the red jack labeled [4W NC]). All four input jacks of the 712 should now
be configured in a 4-wire ohms measurement.
3. Set the Fluke 5520A to the settings in Table 35, and verify the reading as displayed
on the 712 Calibrator:
Fluke 5520A
207.5 Ω
950.0 Ω
2350.0 Ω
4. Disconnect the test leads.
Note
O key to turn on the 712. Press the
Table 35. 712 Resistance Measure Verification
I key, the R key, so that the
Fluke 712
207.4 to 207.6 Ω
949.5 to 950.5 Ω
2349.0 to 2351.0 Ω
Process Calibrators
Verification
27