Precautions To Observe When Performing Measurement - GRAPHTEC GL400 User Manual

2.12 Precautions to Observe When Performing Measurement

Please be sure to read the following carefully in order to prevent electric shocks or shorts.
DANGER
• Do not input voltages exceeding 30 VAC rms or 60 VDC to any of the individual analog input sections or
between the analog input section and the main unit.
• Be sure to use only the AC adapter provided as a standard accessory. The rated power supply range for the
adapter is 100 to 240 VAC, and the rated frequency is 50/60 Hz. Do not use any other voltages.
Input Circuit Diagram for Analog Input (Voltage, Thermocouples)
+
50Ω
0.47µF
0.47µF
–
50Ω
CAUTION
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.
500kΩ
500kΩ
Channel Switching Relay
Checks and Preparation
2-15