Adjusting The Clock Speed; Setting The O Concentration Range; Setting The Analog Output Offset; Setting The Rs-232 Baud Rate - Teledyne 401 Instruction Manual

Teledyne API Model 401 O

4.8 Adjusting The Clock Speed

In order to compensate for clocks which run a little bit fast or slow, there is a variable called
SETUP-MISC-CLK-ADJ. 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.
If the clock speed adjust variable has already been set to a value other than 0 and the speed is
still too fast or too slow, ADD the required adjustment to the current value of the variable. For
example if the clock speed adjustment is already set to +10 and the clock is 5 seconds too slow
per day, add +5 to the current value, yielding +15 as the new value.
4.9 Setting The O
To set the range for the ozone reading to the D/A's press SETUP-MISC-D/A-RNGE. The
operator can select any arbitrary full scale range between 100 and 20,000 ppb. Whatever range is
selected, the value chosen will correspond to 5.00 volts on the analog outputs. For other analog
voltage ranges check the jumper table for the V/F board schematic (drawing 00515 in the
Appendix). The front panel display does not have a range setting due to the fact that it can
display any concentration value up to 20,000 ppb.

4.10 Setting The Analog Output Offset

In order to permit the Analyzer to connect to a wider variety of strip chart recorders and other
instruments, the analog output of the ozone readings can be adjusted by up to ± 500 mV for
0-5 V range (or ± 10% of current analog output range) in software. The default output offset is
0 mV. To change it, press SETUP-MISC-D/A-OFFS and enter a value of from -500 mV to
+500 mV (other ranges will ratio accordingly), followed by ENTR to accept the change, or
EXIT to leave it unchanged. The offset will be reflected immediately on the strip chart recorder
or other instrument.

4.11 Setting The RS-232 Baud Rate

To set the baud rate for the RS-232 channel, press SETUP-COMM-BAUD. Press 300, 1200, or
2400, followed by ENTR to accept the new baud rate, or EXIT to leave the baud rate
unchanged.
Photometric Calibrator Instruction Manual, 01124, Rev. J1
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Concentration Range
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