Teledyne gfc 7000ta operation manual Report Periods in Progress When Instrument is Powered OFF

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

6.7.2.6. 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 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 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.

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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