Teledyne 300 instruction manual Checking the Opto Interrupter, Checking Optical Alignment

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	FIGURE 10.2 DETECTOR
WAVEFORM	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)Press the TST> or TST< button on the front panel until the CO MEAS value is displayed.

b)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.

c)Re-adjust Pot R7 on the Sync Demodulator Board to obtain a CO MEAS reading of 4200 mV (±200).

4.Connect an oscilloscope to U7-Pin 1. Sync the oscilloscope on this channel.

P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 97