GRAPHTEC GL980 - Noise Countermeasures

2-26
CHAPTER 2 Checks and Preparation
2.15 Noise Countermeasures
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Connect the chassis GND of the measurement object.
Ensure that a chassis GND wire of the measurement object is connected to a good ground.
Z3 Z1 Z2
+
-
Vin
R1
R2
Measurement object
GL980
Thermocouple Input terminals
•
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 GND
GL980
•
Noise countermeasures
If measured values uctuate 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 lter to any setting other than “OFF”.