GRAPHTEC GL840 - Precautions to Observe When Performing Measurement

Precautions to Observe When Performing Measurement
Maximum input voltage of standard terminal (B-564)
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 2V)
110Vp-p (Range of 5V to 100V)
< Between input terminal/input terminal (B) >
• Maximum input voltage: 60Vp-p
• Withstand voltage: 350 Vp-p at 1 minute
< Between input terminal/GND (C) >
• Maximum input voltage: 60Vp-p
• Withstand voltage: 350 Vp-p at 1 minute
Maximum input voltage of Withstand High Voltage high-precision terminal (B-565)
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.
Warming-up
GL840 requests to have approximately 30 minutes warm-up in order to have the
specified performance.
Unused channels
The analog input section has high impedance.
If it is open, measured value may vary due to noise.
In such a case, set to "Off" unused channels in the AMP setting menu or short the +
and – terminals.
< Between +/– terminals(A) >
• Maximum input voltage: 60Vp-p (Range of 20mV to 2V)
110Vp-p (Range of 5V to 100V)
< Between input terminal/input terminal (B) >
• Maximum input voltage: 600Vp-p
• Withstand voltage: 600Vp-p
< Between input terminal/GND (C) >
• Maximum input voltage: 300Vp-p
• Withstand voltage: 2300 VACrms at 1 minute
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