Teledyne Camera Accessories T100 ユーザーズマニュアル

165 

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 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 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 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.  Also, the STORE NUM. 
SAMPLES feature will report the number of sample readings taken since the instrument 
was restarted. 

06807C DCN6650