Teledyne 300 Instruction Manual page 96

10.6.7 Checking the Opto Interrupter
Correct operation of the Opto Interrupter on the gas filter wheel can be confirmed by
connecting an oscilloscope U6, Pin 11 on the Sync Demodulator board and comparing
the waveform to Figure 10.1. The waveform should be symmetrical and 5 Volts peak to
peak.
FIGURE 10.1 OPTO PICKUP
WAVEFORM
10.6.8 Checking Optical Alignment
The mirrors used in the optical system of the Model 300 are designed to have their
alignment set permanently during the manufacturing process and no adjustment is
normally needed. If the optical system is disassembled or if failure of any of the optical
components is suspected, the instrument can be checked for proper optical alignment as
follows:
1. Connect a source of zero air to the analyzer.
2. Allow the analyzer to warm-up for 60 minutes.
3. Confirm Optical System Energy through-put by:
a)
b)
c)
4. Connect an oscilloscope to U7-Pin 1. Sync the oscilloscope on this
channel.
P/N 02163G Teledyne API Model 300 CO Analyzer Instruction Manual - Page 90
Press the TST> or TST< button on the front panel until the CO
MEAS value is displayed.
Increase the gain of the Synchronous Demodulation by turning Pot
R7 on the Sync Demodulator board clockwise. If a CO MEAS
value of 5000 mV can obtained, energy throughput is acceptable.
Re-adjust Pot R7 on the Sync Demodulator Board to obtain a CO
MEAS reading of 4200 mV (±200).
FIGURE 10.2 DETECTOR
WAVEFORM