Amprobe DM-4 Power-Quality-Recorder - Manual (Page 32)

If during a recording the external power supply is de-energized, the instrument will
continue the recording using the internal battery power until the batteries are
exhausted (the data stored until the definitive turning off won’t get lost). For this
reason we recommend that you ALWAYS insert a new set of batteries before a
long recording.
• If the instrument is recording or is measuring energy (and the external
power supply is not connected), the recording will continue until the batteries
are exhausted.
Before starting a recording the operator should first evaluate the state of the
equipment, decide what to record and set the instrument accordingly.
In order to facilitate this task the instrument has been factory pre-set with a
general configuration which should fit most cases. Using the RESET option
(See paragraph 5.6).
By pressing RECORD the recording of the selected parameters is started
according to the settings made in the MENU (see paragraphs 5.2 and 5.3).
As the default value of the integration periods is set at 5 seconds the instrument will
store data in the temporary memory every 5 seconds. Afterwards the instrument will
explain the results saved in the temporary memory and will save the first series of
values in the permanent memory. Therefore, if an integration period of 5 seconds has
been set, the recording will continue for about 5 seconds before producing a set of
recorded values. If the recording is interrupted before the selected integration period
has completely elapsed, the data stored in the temporary memory (SRAM) will not be
elaborated and the corresponding series of values won’t be transferred to the
permanent memory (FLASH).
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DM-4 Power Quality Recorder