Verification; Preparing For Verification; 712 Verification (V1.1 And Earlier); Resistance Measure Verification - Fluke 71 Series Calibration Manual

Verification

Preparing for Verification

712 Verification (V1.1 and Earlier)

Resistance Measure Verification

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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). Later 71x calibrators use automatic shutdown to
preserve the batteries. When turned on, the displays will show PS followed
by a number. The number designates minutes until shutdown. If the number
is less than 10, use the arrow keys to set to 15 minutes or more.
To prepare for verification, do the following:
1. Make sure fuse(s) in the UUT are intact. By referring to Table 32, you should not
have to open the unit.
2. Make sure you have the required test equipment available. (Refer to Table 33.)
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.
1. Push the green  key to turn on the 712. Push the
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 34, and verify the reading as displayed
on the 712 Calibrator:
Table 34. 712 Resistance Measure Verification
Fluke 5520A
207.5 Ω
950.0 Ω
2350.0 Ω
www.
Note
 key, the
Fluke 712
207.4 to 207.6 Ω
949.5 to 950.5 Ω
2349.0 to 2351.0 Ω
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Process Calibrators
Verification
 key, so that the
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