Precautions To Observe When Performing Measurement - GRAPHTEC midi LOGGER GL240 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.
•
Do not apply radio-frequency signals with high voltage (50 KHz or 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.
•
Do not input the voltage that is exceeding the specification of this device.
· 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. It will cause the fire.
· Have an enough margin from the specification of withstanding voltage when using this device, it have to
consider a noise and change of the measurement voltage.
· Confirm this device is not broken before the input cable is connected to the input terminal.
· Please take care of the static electricity when the connecting the input cables or the thermocouples.
· Do not touch the tip of thermocouples with bare hand after the thermocouples are connected to the
terminal of this device when the tip of thermocouples is not insulated.
The static electricity of a human body will cause damage to this device.
· Do not put the tip of thermocouples to the object which is containing the static electricity when the tip of
thermocouples is not insulated. The static electricity of object will cause damage to this device.
· Do not put the tip of thermocouples to the object which is containing the leaked high voltage of chassis
or metal etc. when the tip of thermocouples is not insulated.
The leaked high voltage of object will cause damage to this device.
· We recommend that the insulation tape puts on the tip of thermocouples before connecting the
thermocouples to the input terminals.
This will protect this device from the static electricity and the leaked high voltage.
•
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 (Range of 20mV to 1V)
<Between input terminal/input terminal (B) >
Maximum input voltage
Withstand voltage
<Between input terminal/GND (C) >
Maximum input voltage
Withstand voltage
[ Voltage measuring ]
A
B
B
GND
110Vp-p (Range of 2V to 100V)
: 60Vp-p
: 350Vp-p at 1 minute
: 60Vp-p
: 350Vp-p at 1 minute
[ Temperature measuring ]
Thermocouple
+ +
- -
Thermocouple
+ +
C
- -
Thermocouple
+ +
- -
C
GND
B
C
CHAPTER 2 Checks and Preparation
2-19