Teledyne 100E Instruction Manual page 114

Operating Instructions Model 100E Instruction Manual
The REPORT PERIOD can be set from the front panel and is typically used as the time
interval between two permanently stored data points.
The SAMPLE PERIOD is set to one minute by default and cannot be accessed from the
standard iDAS front panel menu, but is available through APICOM or general remote
control procedures. SAMPLE PERIOD determines the frequency of data collection, i.e.
how many times the iDAS records a parameter and stores it in a (volatile) data array for
further processing. In conjunction with the REPORT PERIOD, the SAMPLE PERIOD
determines the number of data points in each average value. If, for example, the SO
2
concentration parameter is configured with a SAMPLE PERIOD set to once per minute
(default setting) and the REPORT PERIOD set to once per hour, the resulting data will
be hourly, arithmetic means calculated from N=60 data points. Calibration and hold-off
procedures as well as power-outs during that one hour will reduce the number of records
per concentration average. For statistical analysis, the number of records per average
data point for a given parameter can also be stored.
Configuring the SAMPLE PERIOD and the REPORT PERIOD for the same value, for
example once per hour, will result in an instantaneous reading once per hour. This value
would be the same as a reading configured for an INSTantaneous data type once per
hour instead of an AVG type.
SAMPLE PERIOD and REPORT PERIOD are defined to be from the beginning to the
end of the respective clock interval. A one-minute period starts and ends with the full
minutes of the analyzer clock, an hourly period starts and ends with the full hour of the
analyzer's clock and so on, even if the iDAS data collection was started within those
periods. A one-minute data point, which is the lowest setting for any period, is always an
instantaneous value (although internally averaged over about 30 milli-seconds of analog
data readings), even when configured as an AVG event.
Averages in progress when instrument is powered off:
The iDAS is capable of averaging parameters over very long time intervals. If the
instrument is powered off during an averaging interval and before the average is
permanently stored in memory, the samples accumulated so far for that REPORT
PERIOD are lost. On the other hand, if the instrument is powered up during an
averaging interval, the iDAS begins averaging samples from that point onward (or after
the hold-off period) until the scheduled end of the REPORT PERIOD when the data point
is permanently stored.
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