Appendix 8 Concerning Noise Countermeasures
A15
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
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