Hioki Memory HiLogger LR8401-20 Instruction Manual page 286

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Appendix 9 Frequently Asked Questions
Question
What is the file limit when auto
saving to removable storage?
Is data retained in internal memo-
ry when I turn the power off after
measuring? I did not use auto
saving to removable storage.
Why is only part of the data saved
when saving to removable stor-
age after measuring?
After starting measurement with
real-time auto saving, can I still
acquire data if I neglected to in-
sert removable storage media un-
til later?
Why does "Saving" continue to
be displayed and saving not fin-
ish when saving internal memory
data as text after measurement?
How to view data saved in binary
format on a PC?
Remedial Action
Depending on file size and CF card ca-
pacity, more than 1,000 files can be
saved in one folder, although only 1,000
can be displayed on the file screen. As
the number of files increases, the time
required to start and stop measurement
also increases, so we recommend stor-
ing no more than 1,000 files, if possible.
(When saving, a folder
"HIOKI_LR8400" is created, and files
with different data types are saved in
subfolders within it.)
If waveforms are displayed when power
is turned on, the data has been retained.
Data in internal memory is retained for
about 30 minutes after power-off. How-
ever, if power is off for more than 30
minutes, the data is lost.
To avoid such data loss, we recommend
preparing and making settings for power
outages when measuring for a long
time.
When A/B cursors are set to specify a
save time span, only data within that
span is saved. Also, internal memory
capacity limits saving of measurement
data to the most recent eight million data
points.
If you need to save more data points,
enable real-time auto saving before-
hand.
As long as storage media is inserted be-
fore internal memory overflows, data
from the start of measurement will be
saved to the removable storage.
In the worst case (shortest interval), in-
ternal memory overflows after about two
minutes.
To save all data from a full internal
memory to removable media as text af-
ter 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).
The Logger Utility PC application pro-
gram is included on the supplied CD. In-
stall it on the PC and use it to open the
file.
Reference page
"6.1 About Saving and
Loading Data" (p. 123)
named
"What happens to data
in a power outage?" (p
.125)
"Specifying a Wave-
form Time Span" (p .92)
"Automatic
(Waveform Data and
Numerical Calculation
Results)" (p .127)
"Replacing Removable
Storage During Real-
Time Saving" (p .129)
Logger Utility
Instruction
"7.1.1 Saving Measure-
ment Data as Text"
"10.3 Using the Logger
Utility" (p. 189)
Saving
manual