Operating Instructions
Teledyne API - Model T200H/T200M Operation Manual
88
4.7.2.5. Sample Period and Report Period
The DAS defines two principal time periods by which sample readings are taken and
permanently recorded:
•
SAMPLE PERIOD
: Determines how often DAS temporarily records a sample
reading of the parameter in volatile memory. The
SAMPLE PERIOD
is set to one
minute by default and generally cannot be accessed from the standard DAS front
panel menu, but is available via the instruments communication ports by using
APICOM or the analyzer’s standard serial data protocol.
SAMPLE PERIOD
is only used when the DAS parameter’s sample mode is set for
AVG, MIN
or
MAX
.
•
REPORT PERIOD
: Sets how often the sample readings stored in volatile memory
are processed, (e.g. average, minimum or maximum are calculated) and the results
stored permanently in the instrument’s Disk-on-Module as well as transmitted via
the analyzer’s communication ports. The
REPORT PERIOD
may be set from the
front panel.
If the
INST
sample mode is selected the instrument stores and reports an instantaneous
reading of the selected parameter at the end of the chosen
REPORT PERIOD
In
AVG, MIN
or
MAX
sample modes, the settings for the
SAMPLE PERIOD
and the
REPORT PERIOD
determine the number of data points used each time the average,
minimum or maximum is calculated, stored and reported to the com ports. The actual
sample readings are not stored past the end of the of the chosen
REPORT PERIOD
.
Also, 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 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.
When the
STORE NUM. SAMPLES
feature is turned on the instrument will also store
how many sample readings were used for the
AVG, MIN
or
MAX
calculation but not
the readings themselves.
4.7.2.6. 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 them in volatile memory as part of the
REPORT PERIOD
currently active at the time of restart. At the end of this
REPORT
PERIOD
only the sample readings taken since the instrument was turned back on will
be included in any
AVG
,
MIN
or
MAX
calculation. Also, the
STORE NUM.
SAMPLES
feature will report the number of sample readings taken since the instrument
was restarted.
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