71X Series
Calibration Manual
28
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. Press the
I key on the 712 Calibrator so that the display indicates:
OUTPUT
Using the large ([,{), and small (],}), scroll keys, source the resistance
settings in Table 36, verifying the readings on the Fluke 8508A display:
Table 36. 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. Press and hold the large { to source 950.0 ohms.
2. Press 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. Press 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 press the
O key to turn the
calibrator off.
Display Verification
1. Press and hold the
I key and then turn the 712 back on by pressing and releasing
the green O key. This locks the 712 in a mode where all display segments are on. All
segments will stay on until the
I 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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