387
Noise Countermeasures
Adding capacitors to signal lines
An eective 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 lter is applied before channels are scanned, there are no limitations on the data refresh
interval.
Device under measurement
Measurement module
Thermocouple
Enm'
r
1
r
2
Vin
Z
1
Z
2
Z
3
Use a capacitor with a
capacitance of several μF
to several thousand μF.
Insert between the positive
and negative measurement
terminals.
Knowledge and Information
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