Hioki MEMORY HiLOGGER LR8450 Instruction Manual page 392

Adding capacitors to signal lines
An effective way to address noise caused by superposed signal sources or high-frequency pulses
is to insert a capacitor between the positive and negative input terminals. The capacitor will keep
the noise out of the device's internal circuitry.
Use a capacitor whose rated voltage is greater than the voltage being input.
Since the filter is applied before channels are scanned, there are no limitations on the data refresh
interval.
Device under measurement
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Thermocouple
Use a capacitor with a
Z
capacitance of several μF
3
to several thousand μF.
Insert between the positive
and negative measurement
terminals.
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