Noise Countermeasures - GRAPHTEC GLT400 User Manual

CHAPTER 2 Checks and Preparation

2.17 Noise Countermeasures

•
Be sure to connect the chassis GND of the measurement object.
It may become effective by ensuring that the chassis GND wire of the measurement object is connected
to a good ground.
Measurement
object
Thermocouple
Z
3
•
Connect the signal chassis GND to the measurement device chassis ground.
Use a short, thick lead to connect the chassis GND of the measurement object to the GLT400's chassis
GND. It will become even more effective if the ground potentials are the same.
Measurement device
chassis
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 GLT400's GND to ground.
Ex 2: Connect GLT400's GND to measurement object's GND.
Ex 3: In the AMP settings menu, set filter to any setting other than "OFF".
Ex 4: Set the sampling interval which enables GLT400's digital filter.
Use the "OTHER" menu to set the commercial power frequency you use.
For details, refer to "4.3 Settings screen" section.
2-38
GLT400
+
R1
Input terminals
Vin
-
R2
Z Z
1 2
measurement
device
GND