Hioki LR8431, Instruction Manual

Page: 53 / 204

3.3 Setting Configuration 1 – Recording Settings
45
3
3
Chapt
er
3 Sett
ing be
fore M
easure
ment
Select whether recording should be resumed
after the specified recording length has
elapsed or after recording is stopped by a
“stop trigger” event.
Electrical noise mixed with input signals can
be removed by digital filtering. Noise suppres-
sion is most effective for longer recordings,
where it can provide higher measurement
accuracy and less scattering. Set as needed to
suit your measurement environment.
See:
"Cut-off frequency" (p. 141)
Set the Recording Length for Repeated or One-time Recording
Repeated recording
On
Off
Select from the
[Repeat]
setting options.
Setting options:(

default setting)
Off

Recording stop after one recording length (time
span).
On Recording restarts after the specified recording
length has elapsed or after recording is stopped
by a “stop trigger” event. To manually stop re-
cording, press the
START/STOP key.
Dead time
When repeating recording is enabled ([Repeat] set to [On])
After a recording length has elapsed, some “dead time” is
needed for internal processing before recording can re-
sume.
Because recording is not available during the dead time,
enable continuous recording (set [Cont] to [On]) if you
need to record without data loss.
Recording
Enable Digital Filtering (noise suppression) (as needed)
Select from the
[Filter]
setting options.
Setting options: 60Hz

, 50Hz, Off (

default setting)
fc: cut-off frequency
When the 60 Hz digital filter is selected, optimum line noise
suppression occurs when the recording length is between
two seconds and one hour.
Noise is suppressed with either 50 Hz or 60 Hz filter selec-
tions, although the measurement timing difference between
channels may be increased, depending on the recording
length. Disabling the filter (set to Off) minimizes such timing
differences (to less than 1 ms between channels).
When disabled (set to Off), broken wire detection is also
disabled (p. 51).