18
Data Logger Model DL913 & DL914
In both recording modes, the instrument samples the inputs at a fixed rate every
200 ms and aggregates the samples every second. The data is stored and
displayed as 1 s values that represent trends.
Normal recording mode:
The instrument stores a sample every second.
Extended recording mode:
The instrument enters a sampling mode where the
selected aggregation period determines the storage interval.
Extended recording mode increases the length of recordings when the instrument
is running on battery power. The instrument stores a sample 4 times per the
selected aggregation period, goes to sleep after recording the sample, and wakes
up 5 seconds before the next sample. This recording mode utilizes single line
cycle storage, so the inputs are ignored between measurement intervals.
For example, if the aggregation period was set to 1 minute, samples would
be stored every 15 seconds. The instrument would be powered down for 10
seconds for a two-thirds reduction in power. However, the decreased storage
interval reduces the measurement resolution.
1.
In Configuration mode
, use the Up ▲ or Down ▼ button to display the
Recording Mode (rEC) configuration screen.
2. Press
to toggle between normal and extended recording mode.
The following table demonstrates the relationship between recording modes,
aggregation period, storage interval, and battery life.
Aggregation Period
Storage Interval
Battery Life
(Wi-Fi Disabled*)
Normal
Recording Mode
Any
1 s
4 days
Extended
Recording Mode
1 min
15 s
7 days
2 min
30 s
14 days
3 min
45 s
21 days
4 min
1 min
30 days
*Enabling Wi-Fi drastically decreases battery life, so the user should only enable Wi-Fi
when the device is externally powered.
3.3 ERASING MEMORY
When the memory indicator indicates the memory is full (
), you will need
to delete one or more recordings from memory to create room for the new
recording. You can only erase the memory through the Control Panel.
To delete memory, the instrument must be connected to a computer (§ 5.3).
1. In the Data Logger Control Panel, click
Instrument
in the toolbar.
2. Select
Erase Memory
in the drop-down menu.
3. From the list of stored recording sessions, select the recordings to delete.
4. Then, click
OK
.
