Hioki LR8431, Instruction Manual, Page: 194 / 204

Appendix 10 Frequently Asked Questions
A
36
If the power goes out while
measurement is in progress, is
the integrity of data being
saved in real time to the CF
card guaranteed? If the power goes out during real-
time save operation, the data on the
CF card may be corrupted. It is rec-
ommended to back up the power
supply with the battery pack. Howev-
er, data on the CF card may still be
corrupted if the battery pack power
supply fails during an extended pow-
er outage.
High-end LR8400 series instru-
ments use a built-in, high-capacity
capacitor to perform file termination
processing in the event of a power
outage, allowing them to save data
up to the time of the outage. 2.1, "Using the Bat-
tery Pack (Option)"
(p.26)
Why is only part of the data
saved when saving to remov-
able storage after measuring? When a save range has been set
with the A and B cursors, only the
selected range is saved. Only data
remaining in the instrument's inter-
nal memory (the last 3.5 M of data)
will be saved after measurement.
To save data in excess of that 3.5 M
of data, enable the auto save (real-
time) setting prior to measurement.
"Specifying a Wave-
form Time Span"
(p.86)
"Automatic Saving"
(p.97)
After starting measurement
with real-time auto saving, can
I still acquire data if I neglected
to insert removable storage
media until later? As long as storage media is inserted
before internal memory overflows,
data from the start of measurement
will be saved to the removable stor-
age.
The instrument's internal memory
can become full in as little as 32 min-
utes. However, since it takes time to
save unsaved data to a CF card or
USB flash drive inserted during
measurement, it is best to use one-
third of that 32-minute figure, or
about 10 minutes, as a rough esti-
mate of the length of data that can
be saved once measurement starts. "Replacing Remov-
able Storage During
Real-Time Saving"
(p.48)
Why does "Saving" continue
to be displayed and saving not
finish when saving internal
memory data as text after mea-
surement? To save all data from a full internal
memory to removable media as text
after measurement takes about one
hour.
To abort the saving process, press
and hold STOP for some time.
We recommend saving binary data,
and later converting to text with the
Logger Utility (which takes only a
few seconds). "7.1.1 Saving Mea-
surement Data as
Text," Logger Utility
instruction manual
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