Hioki LR8431, Instruction Manual

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Appendix 10 Frequently Asked Questions
A
31
Appendix
Can recording resume auto-
matically after a power outage? Enable Auto Resume. Recording will
automatically resume after a power
outage.
Because data measured before the
outage is not retained in internal
memory, we recommend enabling
auto saving to removable storage.
However, if the power goes out dur-
ing real-time save operation, the
data on the CF card may be corrupt-
ed. It is recommended to back up
the power supply with the battery
pack. However, data on the CF card
may still be corrupted if the battery
pack power supply fails during an
extended power 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. "Using the Auto-Re-
sume Function (Re-
sume After Power
Restoration)" (p.120)
If battery power fails while the
instrument is being powered by
the battery, will recording re-
sume when AC power is re-
stored? When battery power fails while the
instrument is being powered by the
battery, the instrument will not turn
back on until the power switch is cy-
cled from OFF to ON. A high-end
LR8400 series instrument is recom-
mended for applications requiring
this type of operation. 2.1, "Using the Bat-
tery Pack (Option)"
(p.26)
How to minimize thermocouple
measurement error when mov-
ing the HiLogger between plac-
es with much different
temperatures? For thermocouple measurements,
terminal temperature is measured
by an internal sensor to provide ref-
erence junction compensation.
When the ambient temperature
changes abruptly, or when air blows
directly on the terminals, errors oc-
cur due to thermal imbalance be-
tween the terminals and emperature
sensor.
When the HiLogger is moved to a lo-
cation with significantly different am-
bient temperature, allow at least 30
minutes for thermal equalization be-
fore measuring. "Instrument Installa-
tion" (p.6)
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