Hioki MEMORY HiLOGGER LR8450 Instruction Manual page 18

Setting Measurement Conditions
2
Under [Filter], check the filter's cutoff frequency.
The filter's cutoff frequency will change depending on the data refresh interval setting.
Check the cutoff frequency that is displayed for each module.
Relationship between the data refresh interval and the recording interval
• Measurement modules send data to the instrument once each data refresh interval.
• The instrument receives data from measurement modules once each recording interval.
• Even if a measurement module's data refresh interval is short, it will not be possible to record
waveform peaks if the instrument's recording interval is long.
Strength of the power
supply frequency filter
Data volume
Waveform peaks
*: If the data refresh interval and recording interval are short.
• For the U8550 to U8553 and LR8530 to LR8533 modules, the longer the data refresh interval,
the lower the digital filter cutoff frequency, yielding more effective noise rejection. For more
information about cutoff frequencies, see the section about each module's digital filter in "10.2
Plug-in Module Specifications" (p. 2 43).
• To maximize the effectiveness of the digital filter, configure the
according to the power supply frequency in the region where the instrument is being used.
See "7.1 Configuring Settings" (p. 1 64).
• For modules whose data refresh interval is longer than the recording interval, the first two data
points will be continuous, and there will be a delay.
Differences in measurement data caused by data refresh intervals and recording intervals
Module
Data refresh interval: 1 s
Peak
1 s
Module
Data refresh interval: 1 s
Peak
1 s
14
Data refresh interval
Short
Weak Strong
–
Easier to capture* More difficult to
capture
Recording interval
Long Short
–
– More data
Easier to capture*
[Power frequency filter]
: Point in measurement data
LR8450/LR8450-1
Recording interval: 2 s
Unable to capture peak
2 s
LR8450/LR8450-1
Recording interval: 1 s
Able to capture peak
1 s
Long
–
Less data
More difficult to
capture
setting