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Data Acquisition system (DAS) and APICOM T400 Ozone Analyzer Operator’s Manual
156
7.1. DAS STATUS
The green SAMPLE LED on the instrument front panel, which indicates the analyzer
status, also indicates certain aspects of the DAS status:
Table 7-1: Front Panel LED Status Indicators for DAS
LED STATE DAS Status
OFF
System is in calibration mode. Data logging can be enabled or disabled for this mode.
Calibration data are typically stored at the end of calibration periods, concentration data are
typically not sampled, diagnostic data should be collected.
BLINKING
Instrument is in hold-off mode, a short period after the system exits calibrations. DAS
channels can be enabled or disabled for this period. Concentration data are typically disabled
whereas diagnostic should be collected.
ON Sampling normally.
The DAS can be disabled only by disabling or deleting its individual data channels.
7.2. DAS STRUCTURE
The DAS is designed around the feature of a “record”. A record is a single data point.
The type of date recorded in a record is defined by two properties:
PARAMETER type that defines the kind of data to be stored (e.g. the average of O
3
concentrations measured with three digits of precision). See Section 7.4.2.1.
A TRIGGER event that de
fines when the record is made (e.g. timer; every time a
calibration is performed, etc.). See Section 7.4.2.
The specific PARAMETERS and TRIGGER events that describe an individual record
are defined in a construct called a DATA CHANNEL (see Section 7.4). Each data
channel related one or m
ore parameters with a specific trigger event and various other
operational characteristics related to the records being made (e.g. the channels name,
number or records to be made, time period between records, whether or not the record is
exported via the analyzer’s RS-232 port, etc.).
06870C DCN6332