4. DESIGNING THE FIXTURES
4.4.2 Confirming the optical axis with an oscilloscope
To monitor with an oscilloscope, use the two monitor connectors provided on the rear
panel of the display unit, “SCAN SIG.-1” and “SCAN SIG.-2”, for measuring unit 1 and
measuring unit 2, respectively.
Oscilloscope setting:
Vertical sensitivity : 0.1V/DIV for a probe of 1/10
Horizontal sensitivity : 50μs/DIV
Among the waveforms shown below, (a) represents the waveform of normal light
reception.
If the light incidence is not normal to the light reception element, adjust the
mounting position between the emission unit and the reception unit to ensure that the light
comes to the center of the light reception element.
If the protective glass is soiled, a waveform such as that shown in (b) or (c) will result. If
this is the case, clean the protective glass according to 1.3.2 Cleaning optical parts to
reduce the disorder of the waveform to less than 0.3V.
Approx.
Approx.
310μＳ
4V
(c) Glass contaminated
(b) Glass contaminated
(a) Normal
No. 99MCA094A
4-5
