GRAPHTEC midi LOGGER GL240 - Page 40

2-20
CHAPTER 2 Checks and Preparation
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Input Circuit Diagram for Analog Input (Voltage, Thermocouples)
Channel Switching Relay
50Ω
50Ω
500kΩ
500kΩ
0.05μF
0.05μF
+
-
Capacitors have been incorporated into the input circuit to increase the noise elimination capability.
After voltage measurement, when the inputs have been disconnected, there will still be some electric
charge remaining.
Before starting another measurement operation, short-circuit the + and - terminals to enable self-
discharge.
The GL240 has a scan system.
While in the status (open) in which signals are not input to the input terminal, measured results may be
inuenced by signals from other channels. In such a case, turn OFF the input setting or short circuit +/-.
If signals are input correctly, measured results are not inuenced by other channels.