XFtp TPNA-1000, Manual

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TPNA-1000 - Section I: The Basics
1.6
The batteries should only be charged when the temperature is
between 10° C and 35° C. Failure to do so could shorten the
battery life.
The date format for the month, day, and year should be set
before files are saved in the TPNA-1000. If the date format is
changed after files have been stored, the date information for
those files will not be correct.
Do not use the TPNA-1000 in any manner not recommended by
the manufacturer.
The maximum input voltage to the meter is 100 V (AC or DC).
A larger voltage will damage the meter.
The accuracy of the meter may be affected in a strong
electromagnetic field.
The battery MUST be charged with the Trilithic charger supplied
with the TPNA-1000. Using any other charger may cause
damage to the battery or instrument.
Precautions
Holding the POWER button down for three (3) seconds or
longer causes the unit hard reboot. In this case, any settings
that have been changed in this power cycle will not be saved.