Example Noise Countermeasures - Hioki MEMORY HiLOGGER LR8450 Instruction Manual

Noise Countermeasures

Example noise countermeasures

Ensuring devices are grounded reliably
• Ground the instrument and wireless modules reliably.
You can ground the chassis by connecting the AC Adapter's grounded two-prong power cord to
an outlet with a grounding electrode.
• Ensure the measurement target's chassis is grounded reliably.
Ensure the measurement target's chassis is reliably connected to a suitable ground.
Device under measurement
Thermocouple
Z
3
• Power the instrument and wireless modules with batteries.
You can reduce the effects of common-mode noise by powering the devices with batteries (without
connecting their AC Adapters) so that the earth current loop is eliminated.
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Measurement module
r 1
r 2
Z
2
V in
Z
1