Teledyne 300M - Manual (Page 48)

Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
4. The concentration value is linearized over the range of 0 to 20,000 PPM by a multi-point
software look-up table and corrected for temperature and pressure.
5. An average of the last 200 samples is computed and converted to the number displayed on
the front panel. This is the Carbon Monoxide concentration. The number is also routed to the
D/A converter and the resulting voltage is output at the back panel to the recorder and DAS
(datalogger).
4.3 Setting the Time-of-Day
To set the current time-of-day, which is used for determining when to do an automatic
calibration and for time-stamping the RS-232 reports, press SETUP-CLK-TIME. The CPU will
display the current time-of-day as four digits in the format "HH:MM", where "HH" is the hour in
24-hour format (i.e. hours range from 00 to 23) and "MM" the time-of-day and then press ENTR
to accept the new time, or press EXIT to leave the time unchanged.
4.4 Setting the Date
To set the current date, press SETUP-CLK-DATE. The CPU will display the current date as
"DD MMM YY". For example, April 1, 1999 would be displayed as "0 1 APR 9 9". Change the
date by pressing the button under each field until the desired date is shown. Then press ENTR to
accept the new date or press EXIT to leave the date unchanged.
4.5 Adjusting the Clock Speed
In order to compensate for clock which run a little bit fast or slow, there is a variable to speed up
or slow down the clock by a fixed amount every day. To change this variable, press SETUP-
MORE-VARS. Press NEXT until the CLOCK_ADJ variable is displayed. To change the
setting, press the EDIT key and enter the value from the keyboard. Press ENTR to accept the
change. This variable is set to the number of seconds per day by which to speed up or slow down
the clock. It should only need to be set once for each analyzer. For example, if the clock is
running 10 seconds fast each day, set the variable to -10 and press ENTR. (Note that -10
indicates that we want the clock to run 10 seconds slower each day.) If the clock is running 10
seconds slow each day, set the variable to +10, indicating that we want the clock to run 10
seconds faster each day.
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