CR300-Series Datalogger
42
When running fast programs or writing to multiple data tables, this normal
function of erasing memory sectors can result in skipped scans.
By default, data storage memory sectors are organized as ring memory. When
the ring is full, oldest data are overwritten by newest data. Using the
FillStop
statement sets a program to stop writing to the data table when it is full, and no
more data are stored until the table is reset. To see the total number of records
that can be stored before the oldest data are overwritten, or to reset tables, go to
Station Status
|
Table Fill Times
in your datalogger support software.
6.8.2 CPU Drive
The CPU drive contains datalogger programs and other files. It holds a copy of
final-data memory when the
TableFile()
instruction is used. It provides
memory for
FileRead()
and
FileWrite()
operations. This memory is managed
in
(p. 57)
. When writing to files under program control, take care to
write infrequently in order to prevent premature failure of serial flash memory.
6.9 Time Keeping
Measurement of time is an essential function of the CR300. Time measurement
with the onboard clock enables the CR300 to attach time stamps to data,
measure the interval between events, and time the initiation of control
functions. Clock accuracy is ±1 minute per month, with a resolution of 1 ms.
An internal lithium battery backs the clock (see Section
7. Specifications
7.1 Voltage Measurements – Specifications
Voltage measurements use a 24-bit A-to-D converter. One channel at a time is
measured in numeric succession.
Terminals
Differential Configuration:
DIFF 1H/1L – 3H/3L
Single-Ended Configuration:
SE 1 - 6
Ranges:
–100 to +2500 mV
–34 to +34 mV
Accuracy
1,2
0 to 40 °C:
±(0.04% of r Offset
3
)
–40 to 70 °C:
±(0.1% of r Offset
3
)
Resolution:
Measurement Range and Resolution
(p. 43)
Speed:
Analog Voltage
Measurement Speed
(p. 44)
Input Resistance:
Measurement Input Resistance and
(p. 44)
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