Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 82)

Model 9110TH NOx Analyzer Operating Instructions
Teledyne Analytical Instruments 62
4.7.1. DAS STRUCTURE
The DAS is designed around the feature of a “record”, an automatically stored single
data point. (e.g. concentration, PMT signal level, etc.). Records are organized into data
channels which are defined by properties that characterize the:
 Type of date recorded (e.g. concentration, PMT signal level, etc.);
 Trigger event that causes the record to be made (e.g. every minute, upon
exiting calibration mode, etc.);
 How many records to be stored, as well as;
 How the information is to be stored (e.g. average over 1 hour, individual
points, minimum value over last 5 minutes, etc.).
The configuration of each DAS channel is stored in the analyzer’s memory as a script,
which can be edited from the front panel or downloaded, edited and uploaded to the
instrument in form of a string of plain-text lines through the communication ports.
4.7.1.1. DAS Channels
The key to the flexibility of the DAS is its ability to store a large number of
combinations of triggering events and data parameters in the form of data channels.
Users may create up to 20 data channels. For each channel one triggering event is
selected and one or all of the 9110TH/M’s 25 data parameters are allowed. The number
of parameters and channels is limited by available memory.
The properties that define the structure of an DAS data channel are:
Table 4-7: DAS Data Channel Properties
PROPERTY DESCRIPTION DEFAULT SETTING RANGE
NAME The name of the data channel. “NONE” Up to 6 letters or digits 1.
TRIGGERING
EVENT
The event that triggers the data channel to
measure and store the datum
ATIMER
Any available event
(see Appendix A-5).
NUMBER AND
LIST OF
PARAMETERS
A User-configurable list of data types to be
recorded in any given channel.
1 - PMTDET
Any available parameter
(see Appendix A-5).
REPORT PERIOD
The amount of time between each channel data
point.
000:01:00
000:00:01 to
366:23:59
(Days:Hours:Minutes)
NUMBER OF
RECORDS
The number of reports that will be stored in the
data file. Once the limit is exceeded, the oldest
data is over-written.
100
1 to 1 million, limited by
available storage space.
RS-232 REPORT
Enables the analyzer to automatically report
channel values to the RS-232 ports.
OFF OFF or ON
CHANNEL
ENABLED Enables or disables the channel. Allows a channel
to be temporarily turned off without deleting it.
ON OFF or ON
CAL HOLD OFF
Disables sampling of data parameters while
instrument is in calibration mode
2 .
OFF OFF or ON
1 More with APICOM, but only the first six are displayed on the front panel).
2 When enabled records are not recorded until the DAS HOLD OFF period is passed after calibration mode. DAS HOLD OFF set in
the VARS menu (see Section 4.12.)