GRAPHTEC GLT400 User Manual page 57

B-565
•
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.
* This applies to all the channels even if channel extension is used.
< Between +/– terminals (A) >
• Maximum input voltage : 60Vp-p (Range of 20mV to 2V)
<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
•
Input Circuit Diagram for Analog Input (Voltage, Thermocouples)
+
50Ω
-
50Ω
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 GLT400 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.
: 110Vp-p (Range of 5V to 100V)
: 600Vp-p
: 600Vp-p
: 300Vp-p
: 2300VACrms at 1 minute
[ Temperature measuring ]
Thermocouple
+
-
Thermocouple
+
C
-
Thermocouple
+
-
C
GND
500kΩ
0.05μF
0.05μF
500kΩ
CHAPTER 2 Checks and Preparation
B
C
2-37