Filter
Top Products
T400 Ozone Analyzer Operator’s Manual Data Acquisition system (DAS) and APICOM
167
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.
Note In AVG, MIN or MAX sample modes (see Section 7.4.2.1), 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. When the STORE NUM SAMPLES feature is turned on, the
instrument will store the number of sample readings that were used to
compute the AVG, MIN or MAX.
7.4.4. 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.
7.4.5. EDITING THE NUMBER OF RECORDS
The number of data records in the DAS is limited to about a cumulative one million data
points in all channels (one megabyte of space on the disk-on-chip). However, the actual
number of records is also limited by the total number of parameters and channels and
other settings in the DAS configuration. Every additional data channel, parameter,
number of samples setting etc. will reduce the maximum amount of data points
somewhat. In general, however, the maximum data capacity is divided amongst all
channels (max: 20) and parameters (max: 50 per channel).
The DAS will check the amount of available data space and prevent the user from
specifying too many records at any given point. If, for example, the DAS memory space
can accommodate 375 more data records, the ENTR button will disappear when trying
to specify more than that number of records. This check for memory space may also
06870C DCN6332