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 : 350 Vp-p at 1 minute
<Between input terminal/GND (C) >
・Maximum input voltage : 60Vp-p
・Withstand voltage : 350 Vp-p at 1 minute
Warming-up
GL220 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.
Noise countermeasures
If measured values fluctuate due to extraneous noise, conduct the following
countermeasures.
(Results may differ according to noise type.)
Ex 1 : Connect the GL220's GND to ground.
Ex 2 : Connect GL220's GND to measurement object's GND.
Ex 3 : In the AMP settings menu, set filter to any setting other than "OFF".
Ex 4 : Operate GL220 with batteries (Option: B-517).
Ex 5: Set the sampling interval which enables GL220’s digital filter (see table below).
Precautions to Observe When Performing Measurement
＋
＋
＋
ー
ー
ー
B
C
A
4
Number of Measuring
Channels*
Sampling Interval which
enables Digital Filter
Allowed Sampling Interval
1 chahnnel or less
2 chahnnels or less
5 chahnnels or less
10 chahnnels or less
50 msec or slower
125 msec or slower
250 msec or slower
500 msec or slower
10 msec or slower**
20 msec or slower**
50 msec or slower**
100 msec or slower
*Number of Measuring Channels” is the number of channels in which
input settings are NOT set to “OFF”.
**Temperature cannot be measured when the sampling interval is set to 10, 20, or 50 ms.
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