Precautions To Observe When Performing Measurement - GRAPHTEC midi LOGGER GL220 User Manual

2.11

Precautions to Observe When Performing Measurement

Please be sure to read the following carefully in order to prevent electric shocks or shorts.
• Maximum input voltage
If a voltage exceeding the specified value is input, the semiconductor relay in the input section will be
damaged. Never input a voltage exceeding the specified value even for a moment.
<Between +/– terminals (A) >
• Maximum input voltage : 60Vp-p
<Between input terminal/input terminal (B) >
• Maximum input voltage : 60Vp-p
• Withstand voltage
<Between input terminal/GND (C) >
• Maximum input voltage : 60Vp-p
• Withstand voltage
• Input Circuit Diagram for Analog Input (Voltage, Thermocouples)
• Do not apply voltage of 60Vp-p or above between the analog input section and main unit, or between
analog input channels.
• Do not apply high-voltage high-frequency signals (50 kHz and above).
• 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.
: 350 Vp-p at 1 minute
: 350 Vp-p at 1 minute
50Ω
50Ω
Channel Switching Relay
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 GL220 has a scan system.
While in the status (open) in which signals are not input to the input terminal, measured results may be
influenced 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 influenced by other channels.
500kΩ
0.05µF
0.05µF
500kΩ
CHAPTER 2 Checks and Preparation
2-15