Hioki LR8431, Instruction Manual

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Appendix 8 Concerning Noise Countermeasures
A
15
Appendix
The Importance of Device Grounding
Ground the instruments (Model LR8431-20) securely
The LR8431-20 is designed so that the chassis is grounded when the three-prong
power cord from the adapter is plugged directly into a grounded, three-prong recep-
tacle.
If a three-prong-to-two-prong adapter must be used on the AC adapter power cord
and therefore the instrument is not grounded, the instrument can still be grounded by
connecting a grounded wire to the GND terminal (a pushbutton terminal) located on
the side of the LR8431-20.
Securely ground the chassis of the device being tested.
Securely connect the chassis of the device being tested to a good ground.
Connecting the chassis GND on the signal side to the instrument chas-
sis
When connecting the chassis ground of the LR8431-20 to the chassis ground of the
device being tested and then to ground, use a wire that is as short and as thick as
possible to bring both pieces of device to equal potential.
Thermocouple
Device being
Tested Instrument
Grounding Both the Device Being Tested
and the Instrument
Chassis GND of In-
strument being Test-
ed
GND of the

Instrument