Noise Countermeasures - GRAPHTEC GL980 User Manual

CHAPTER 2 Checks and Preparation

2 . 1 5 Noise Countermeasures

•
Connect the chassis GND of the measurement object .
Ensure that a 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 this device'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 this device's GND to ground.
Ex 2 : Connect this device's GND to measurement object's GND.
Ex 3 : In the AMP settings menu, set filter to any setting other than "OFF".
2-26
GL980
+
R1
Input terminals
Vin
-
R2
Z Z
1 2
GL980
GND