SIMPLE LOGGER II
English
Page 60
NOTE:
If either the XRM or the FIFO memory management mode is used, recording continues
beyond the real capacity because memory spaces are released for the new data. The memory release mode
depends on the management mode chosen (see the DataView
®
manual).
Situation: the battery voltage becomes too low for completion of the recording sequence
If the battery voltage falls to 1.7 V:
Recording stops
The recorded data are saved.
The green and red LEDs go off.
The logger continues to record until the battery voltage falls to 1.7 V. At this point, pressing the "PRESS"
button will not restart the device for any length of time; after the automatic switching off of the logger, the
battery voltage may substantially recover and so allow restarting, but for a very limited time only.
In this situation, the batteries must be replaced to allow the transfer of the data.
NOTE:
Replacing the batteries while the device is off does not result in loss of the recorded
data. An internal capacitor maintains the date and time while the batteries are replaced. If the battery voltage
falls too low or if the batteries are out for too long, the date and time will be lost but no recorded data will be
lost.
Situation: the recording sequence ends
The logger returns to standby mode in one of the following situations:
The sequence terminates because the programmed end of recording time is reached.
Recording is in "Start/Stop" mode and the memory is full.
The operator can end recording by pressing the "PRESS" button until the orange stop LED lights
and releasing it before the next LED lights, or else by ordering recording stopped from the control
panel of the Simple Logger
®
II.
When this is done, the logger can be restarted from the computer for the downloading of the data (if there is
enough energy left in the batteries).
The logger is then ready for another sequence or for a download. Pressing the "PRESS" button until the
green starting LED lights and releasing it before the next LED lights starts another recording sequence if
enough memory is still free.
4.10 Event Logger Operation
(Model L404 only)
The Model L404 monitors up to four channels for the occurrence of events and stores information about each
event. The rate at which each input is tested for the event status is defined by the sample period.
Events that are shorter in duration than the period between sampling can potentially be missed. For this
reason the sample period should be chosen to be at least twice the fastest event rate (e.g. An event being
monitored is expected to occur no faster than once per minute. The sample period should then be set to at
least every 30 seconds).
An event starts when the input goes low and ends when the input goes high. For contact closure this would
be when the contact is closed and then opened. The logger records the time the event started and the
duration of the event. The accuracy of the start time and duration is limited to the rate at which the inputs are
tested (as defined by the sample period).
