71X Series
Calibration Manual
28
4. Disconnect the test leads.
Resistance Source Verification
1. Using four test leads, connect the four jacks of Fluke 8508A (Ω Sense 'Hi & Lo' and
Input 'Hi & Lo') to the two middle jacks of the 712 Calibrator (black to black; red to
red). This puts the Fluke 8508A in a 4-wire configuration.
2. On the Fluke 8508A , select four-wire ohms measurement and up-range to the 1 kΩ
range. Use the 1 kΩ range for the first test point, and use the 10 kΩ range for the last
two test points. Correct ranging is important in supplying the correct excitation
current back into the 712 Calibrator. Otherwise the specifications may change, or the
measurements may be incorrect.
3. Push the
key on the 712 Calibrator so that the display indicates:
OUTPUT
Using the large (,), and small (,), scroll keys, source the resistance settings
in Table 35, verifying the readings on the Fluke 8508A display:
Table 35. 712 Resistance Source Verification
Fluke 712 Fluke 8508A
207.5 Ω .2074 to .2076 kΩ
950.0 Ω .9495 to .9505 kΩ
2350.0 Ω 2.349 to 2.351 kΩ
Keypad Test
1. Push and hold the large to source 950.0 Ω.
2. Push and hold the small scroll key. Verify the numbers scrolling on the display
changes in 0.1 increments, then changes in 1.0 increments, then in 10.0 increments.
3. Push and hold the small
scroll key. Verify the numbers scrolling on the display
changes in 0.1 decrements, then changes in 1.0 decrements, then in 10.0 decrements.
4. Disconnect all test leads from the 712 Calibrator and push the
key to turn the
calibrator off.
Display Verification
1. Push and hold the
key and then turn the 712 back on by pressing and releasing
the green key. This locks the 712 in a mode where all display segments are on. All
segments will stay on until the
key is released.
2. Check to see that all segments of the LCD are displayed.
3. Turn the 712 off.
The 712 verification test is complete.
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