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Operating Instructions
6.12.6. Sample Period and Report Period
The iDAS defines two principal time periods by which sample readings are taken
and permanently recorded:
•
Sample Period: Determines how often iDAS 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
iDAS 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 iDAS 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 instruments Disk-on-Chip 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 COMM
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 iDAS 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.
156
Model 400E Ozone Analyzer
Instruction Manual
P/N 04316 Rev: B
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