Teledyne T200H User Manual page 90

Operating Instructions
4.7.2.5. Sample Period and Report Period
4.7.2.6. Report Periods in Progress when Instrument Is Powered Off
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The DAS defines two principal time periods by which sample readings are taken and
permanently recorded:
•
SAMPLE PERIOD:
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.
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.
SAMPLES feature will report the number of sample readings taken since the instrument
was restarted.
Teledyne API - Model T200H/T200M Operation Manual
Determines how often DAS temporarily records a sample
Also, the STORE NUM.
07270D DCN7141