Series III Multimeter
Lo-Ohms Calibration
19
Lo-Ohms Calibration
Note
For the Fluke 26 or 79 Series III with a serial number greater than 71220000, use the
following procedure.
1. Perform the calibration procedure described under the heading Calibration Adjustment in this
document.
2. Place the Meter in Lo-Ohms (40 Ω).
3. Connect the UUT to a resistance decade box.
4. Connect a multimeter in parallel with the UUT (to measure the output voltage of the UUT).
5. Set the decade box to 0 Ω.
6. Press and hold rfor at least one second.
7. Press r and verify that CAL is displayed.
8. Verify the UUT reads 0-2 Ω.
9. Set the decade box to 40 Ω.
10. Note the difference between the displayed resistance on the UUT and 40 Ω. This value will be used in
step 12.
11. Set the decade box to 200 MΩ.
12. Multiply the value from step 10 by .017.
13. If the measured value in step 10 was greater than 40 Ω, decrease the measured voltage on the Meter by
the calculated value from step 12 by adjusting R40.
If the measured value in step 10 was less than 40 Ω, increase the measured voltage on the Meter by the
calculated value from step 12 by adjusting R40.
14. Repeat steps 5-13 until step 10 is within 38-42 Ω.
15. Reassemble the UUT.
16. Verify the performance of the Meter using the procedures listed under the heading Performance Tests
in this document.
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