8508A
Service Manual
3-12
configuration used by Fluke for Multimeter calibration. Figure 3-1 shows the
interconnections used in detail. If alternate leads are substituted, make sure they are
metrology grade leads, and of adequate voltage and current ratings. Leads should be kept
as short as possible, constructed from low capacitance low leakage dielectric material
(PTFE) with low thermal emf terminations, and exactly duplicate the configuration and
interconnections shown.
When calibrating the 2 G
Ω
and 20 G
Ω
resistance ranges the 1 G
Ω
standard resistor
supplied in the Fluke 8508A-7000K Calibration kit plugs directly into the Multimeter’s
front input terminals, without any interconnecting leads. If alternate resistance standards
are used for resistance calibration, refer to the resistance-measurements section of
Chapter 3
Making Measurements
for connection details.
The Fluke 8508A-7000K Calibration kit also contains two precision low-thermal emf
4-wire shorting devices for use when performing the non-volatile input offset adjustments
at the front and rear input terminals. These devices link the input terminals in the
following order: Input Lo to Input Hi to Sense Hi to Sense Lo. If these devices are not
available it is recommended that a U-shaped piece of thick bare copper wire be used to
link the terminals in the same manner.
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