GL900 USER'S MANUAL - Graphtec

Checks and Preparation
2.12 Noise Countermeasures
Be sure to connect the chassis GND of the object to be measured.
It may become effective by ensuring that the chassis GND wire of the measurement object is
connected to a good ground.
Measurement object
Thermocouple
R1
Input terminals
+
GL900
Vin
R2
–
Z3
Z1
Z2
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 GL900’
chassis GND. It will become even more effective if the ground potentials are the same.
Measurement device chassis
GL900
GND
GND
Examples of noise countermeasures
If measured values fluctuate due to external noise, the following countermeasures are
recommended.
(Results may differ depending on the noise type.)
Example 1: Connect the GL900's GND to ground.
Example 2: Connect the GL900's GND to the measurement target's GND.
Example 3: In the AMP Settings menu, set Filter to any setting other than OFF.
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