6
Noise countermeasures
If measured values fluctuate due to extraneous noise, run the following
countermeasures.(Results may vary according to types of noise issues.)
Ex 1 : Connect the GL840's GND input to ground.
Ex 2 : Connect GL840's GND to measurement object's GND.
Ex 3 : Operate GL840 with batteries (Option: two B-569 batteries).
Ex 4 : In the AMP settings menu, set filter to any setting other than "OFF".
Ex 5: Set the sampling interval which enables GL840’s digital filter
(see table below).
*1 Number of Measuring Channels is the number of active channels channels in which
input settings are set to a value and NOT to “OFF” .
*2 Temperature are not measured when the sampling interval is set to 50 ms or faster.
In the "OTHER" menu, the commercial power frequency to be used must be
set.
Set the AC power frequency to be used.
Device to be
measured
Z3
GL840
Z1 Z2
Thermocouple Input terminals
Vin
R1
R2
Select items
50 Hz
60 Hz
Area where the power frequency is 50 Hz
Area where the power frequency is 60 Hz
Description
Number of Measuring
Channels
*1
1 Channel or less
5 Channels or less
2 Channels or less
10 Channels or less
11 to 20 Channels
21 to 50 Channels
51 to 100 Channels
101 to 200 Channels
10 msec or slower
*2
50 msec or slower
*2
20 msec or slower
*2
100 msec or slower
200 msec or slower
500 msec or slower
1 sec or slower
2 sec or slower
50 msec or slower
250 msec or slower
125 msec or slower
500 msec or slower
1 sec or slower
2 sec or slower
5 sec or slower
10 sec or slower
Allowed Sampling
Interval
Sampling Interval which
enables Digital Filter
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