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DAC and APICONTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 176
The SAMPLE PERIOD and REPORT PERIOD intervals are synchronized to the
beginning and end of the appropriate interval of the instruments internal clock.
If SAMPLE PERIOD were set for one minute the first reading would
occur at the beginning of the next full minute according to the instrument’s
internal clock.
If the REPORT PERIOD were set for of one hour, the first report activity
would occur at the beginning of the next full hour according to the
instrument’s internal clock.
EXAMPLE:
Given the above settings, if the DAS were activated at 7:57:35 the first sample would
occur at 7:58 and the first report would be calculated at 8:00 consisting of data points for
7:58, 7:59 and 8:00.
During the next hour (from 8:01 to 9:00), the instrument will take a sample reading
every minute and include 60 sample readings.
Note In AVG, SDEV, MIN or MAX sample modes (see Section 6.1.5.3), the
settings for the Sample Period and the Report Period determine the
number of data points used each time the parameter is calculated, stored
and reported to the COMM ports.
The actual sample readings are not stored past the end of the chosen
report period.
When the STORE NUM SAMPLES feature is turned on, the instrument will
store the number of measurements used to compute the AVG, SDEV, MIN
or MAX Value, but not the actual measurements themselves.
REPORT PERIODS IN PROGRESS WHEN INSTRUMENT IS POWERED OFF
If the instrument is powered off in the middle of a REPORT PERIOD, the samples
accumulated so far during that period are lost. Once the instrument is turned back on,
the DAS restarts taking samples and temporarily stores them in volatile memory as part
of the REPORT PERIOD currently active at the time of restart. At the end of this
REPORT PERIOD PERIOD, only the sample readings taken since the instrument was
turned back on will be included in any AVG, SDEV, MIN or MAX calculation.
Also, the STORE NUM SAMPLES feature will report the number of sample readings
taken since the instrument was restarted.