Hioki LR8400-20, Instruction Manual

Page: 277 / 300

Appendix 8 Concerning Noise Countermeasures
A
15
Appendix
Noise Countermeasure Example
1st. The Importance of Device Grounding
Ground the HiLogger securely
The HiLogger 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 receptacle.
If a three-prong-to-two-prong adapter must be used on the AC adapter power cord and
therefore the HiLogger is not grounded, the HiLogger can still be grounded by connect-
ing a grounded wire to the GND terminal (a M3 screw type terminal) located on the exter-
nal control terminals of the HiLogger.
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 HiLogger chas-
sis
When connecting the chassis ground of the HiLogger 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.
Thermo-
Device being Tested
HiLogger
Grounding Both the Device Being
Tested and the HiLogger
To chassis ground of
measurement object
HiLogger ground
Open the external
control terminal
cover.
External control
terminal