GRAPHTEC GLT400 User Manual page 111

(3)-1 Sampling interval
This is used to set the sampling interval for data capture.
The table below shows the number of measuring channels and sampling interval values that can be set.
If data fluctuate due to noise, set the sampling interval to a value which enables the digital filter function.
Number of Measuring
Channels*
1
1CH
2CH
3CH to 5CH
6CH to 10CH
11CH to 20CH
21CH to 50CH
51CH to 100CH
101CH to 200CH
*1: The number of measurement channels is the number of channels for which the input settings for standard terminal,
withstand high-voltage high-precision terminal, and screwless terminal are set to other than OFF.
*2: When the temperature setting is performed in 10, 20, or 50 ms sampling interval, the data capture cannot be
performed.
*3: It is necessary to accurately set the digital filter to the AC power frequency to be used. Refer to "(6)-6 AC line
frequency" below to set the correct settings.
(3)-2 External sampling
This is used to enable or disable or disables external sampling.
When the external sampling function is enabled, data is captured at the shortest intervals and retained
temporarily.
This retained data is updated at the shortest intervals.
On receiving an external sampling pulse, the retained data is written to the internal memory or SD CARD. (See
the following figure.)
Therefore, the maximum error in time between the actually captured data and the external sampling pulse is
the same as the shortest interval.
Refer to the next section, "(3)-3 AC line filter" for details on the shortest interval.
Input signal
Shortest interval
External Sampling pulse
Capture data
● If the external sampling function is ON, the external input cannot be selected for the trigger setting.
If the external input has already been set, the trigger will be set to Off.
● To measure a noisy signal, set the AC line filter to On as described in "(3)-3 AC line filter" below.
Allowed Sampling Interval
10ms or slower *
20ms or slower *
50ms or slower *
100ms or slower
200ms or slower
500ms or slower
1s or slower
2s or slower
Sampling
interval
Data for this
CHAPTER 4 Settings and Measurement
Sampling Interval which enables
2
2
2
Data for this
Digital Filter* 3
50ms or slower
125ms or slower
250ms or slower
500ms or slower
1s or slower
2s or slower
5s or slower
10s or slower
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