Noise Countermeasures - GRAPHTEC midi LOGGER GL220 User Manual

CHAPTER 2 Checks and Preparation
2.12

Noise Countermeasures

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Be sure to connect the chassis GND of the object to be measured.
Ensure that the chassis GND wire of the measurement object is connected to a good ground.
Measurement object
●
Connect the signal chassis GND and the measurement device chassis ground.
Use a short, thick lead to connect the chassis GND of the measurement object to the GL220' schassis
GND. It will be even more effective if the ground potentials are the same.
Measurement device chassis
2-16
Thermocouple
Z
3
GND
Noise countermeasures
If measured values fluctuate due to extraneous noise, conduct the following countermeasures.
(Results may differ according to noise type.)
Ex 1 : Connect the GL220's GND to ground.
Ex 2 : Connect GL220's GND to measurement object's GND.
Ex 3 : In the AMP settings menu, set filter to any setting other than "OFF".
Ex 4 : Operate GL220 with batteries (Option: B-517).
Ex 5: Set the sampling interval which enables GL220's digital filter.
In the OTHR menu, set the frequency of the AC line used.
Refer to page 3-35 for details.
GL220
R1
Input terminals
R2
Z
1
GL220
GND
Vin
Z
2