Fluke 8508A - Normal Ω Checks; Normal Loi Ω Checks; Tru Ω Checks; Tru Ω Loi Checks

8508A
Users Manual
Normal Ω Checks
1. Press the
Ω key.
2. Press the
CONFIG key and select 4wΩ. Ensure LoI is deselected.
3. Select the required 8508A range.
4. On the Calibrator, select zero Ω and Operate. Alternatively if using a standard
resistor connect the standard resistor for a 4-wire resistance zero. (For the 200 MΩ
range and above, de-select Ex SNS on the calibrator and de-select
4WΩ οn the
8508A.)
5. On the 8508A press the
INPUT key, and select Zero Rng to initiate the zeroing
operation.
The
Busy legend will appear, and then extinguish when the zero operation has
completed.
6. On the Calibrator, select Range Gain point Output value. Alternatively if using a
standard resistor re-connect the standard resistor to measure its resistance.
7. Note the 8508A reading. Compare the result with the allowable tolerance, taking into
account the actual value of the calibrator resistance output for this value or the
calibrated value of the resistance standard used.
8. Repeat steps 3 – 7 for the remaining ranges of the selected resistance mode. (For the
2G Ω and 20 GΩ ranges the 8508-7000K 1 GΩ standard resistor is used in place of
the calibrator. For the 200 MΩ range and above, de-select Ex SNS on the calibrator
and de-select
4WΩ οn the 8508A).
Normal LoI Ω checks
Follow the procedure for Normal Ω checks ensuring that LoI is selected.
Press the Ω key. Press the CONFIG key and select LoI.
Tru Ω checks
Follow the procedure for Normal Ω checks except select the Ω Plus key followed by Tru
Ω instead of selecting the Ω key (2 Ω to 20 kΩ ranges only).
Tru Ω LoI checks
Follow the procedure for Normal Ω checks except select the Ω Plus key followed by
TruΩ instead of selecting the Ω key. Press the CONFIG key and select LoI (2 Ω to 20 kΩ
ranges only).
HiV Ω checks
Follow the procedure for Normal Ω checks except select the Ω Plus key followed by HiV
Ω instead of selecting the Ω key.
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