DI–710 Series and DI-715B Series Hardware Manual
Operation
37
If the memory card is full, the Mode LED will quickly flash orange and then green and will not record new data until
reformatted. Circular memory configuration may still be used if the memory card has not started to wrap the data (i.e.,
as long as the card is not full) and will only wrap data in the available space.
When recording at low sample rates be aware that the memory card must acquire 256 samples before it actually com-
mits them to memory. For example, if you are recording one channel at 1 sample per second and power down occurs
unexpectedly, you could lose up to 255 seconds (4 minutes and 15 seconds) of data (255 samples). Use the following
formula to determine the maximum amount of data loss at power failure.
Note: Switching memory cards before power is restored is not suggested because the data logger will automatically
attempt to close the file. Leave the memory card in until power is restored, then allow the instrument to close the data
file. After a new file has begun, stop recording. The memory card may now be removed and read for analysis.
W
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D
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Waveform Browser for MMC
All files recorded in Stand-alone data logger operating mode (data saved to MMC or SD—.wdc files) must be
reviewed in W
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D
AQ
Waveform Browser for MMC. Data files recorded using W
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D
AQ
Acquisition software (PC
operation—.wdq files) must be reviewed in the standard W
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D
AQ
Waveform Browser. Even if connected to a PC,
W
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Waveform Browser cannot eavesdrop on the data being recorded to your memory card. Recording must be
stopped and the file must be closed to review the data.
DI-710 and DI-715B stand-alone data loggers place 256 equally-spaced event markers into all data files when record-
ing to MMC or SD. This allows easier navigation through larger files. Click on
Event Markers
in the
View
menu to
access and “jump to” each of these event markers.
The
Calculate
command in the
File
menu is unavailable in W
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D
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Waveform Browser for MMC. Use the
Save
As...
command in the
File
menu to save data to another format in order to perform Advanced CODAS calculations
(
File
>
Save As...
> option
8) CALC
is still available). Converting data from a .wdc format to a .wdq format is also
possible with
File
>
Save As...
. Choose option
2) Binary (with CODAS header)
and enter a file name with .wdq as
the extension. For more information regarding the Save As... function, consult your W
IN
D
AQ
Waveform Browser
Help File.
A stand-alone data file acquired with remote events or storage enabled displays an hourglass when opening while it
scans for event marks and timestamps in order to construct an Event Marker table. Use File Save or the "Save All"
button when changing files or exiting to write the Event Marker table to the file and avoid a delay when the file is
opened again.
255
Throughput Rate
----------------------------------------
Seconds of data that COULD be lost
=
