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8. Connect a probe CH1 of the oscilloscope to TP2 on the CONT.A board and the CH2 to
the signal output of the signal generator.
9. Set the output frequency of the signal generator as shown bellow;
10. Select X-Y mode on the Oscilloscope in order to display the "Lissajous figure".
11. Adjust the R25 so that the "Lissajous figure" obtained on the oscilloscope becomes
stable.
Waveform before adjustment
11.Set the DIP switch S2 #4 to ON.
12.Turn the test switch off.
13. Set the DIP switch S1 as shown below;
Transmission
frequency
#1
50 kHz
OFF
40 kHz
OFF
33 kHz
OFF
14. Set the DIP switch S2 #4 to OFF( all bits of S1: OFF).
15. Turn on the test switch
16. Adjust R5 on the CONT.B board so that the frequency obtained at the TP1 becomes as
follows,
Note; the frequency obtained at TP1 may be unstable, since it is modulated.
17. Set the output frequency of the signal generator as shown bellow;
Transmission frequency
50 kHz
40 kHz
33 kHz
Figure 3.5 Lissajous figure
#2
#3
OFF
ON
OFF
ON
OFF
ON
Transmission frequency
50 kHz
40 kHz
33 kHz
Signal generator
50 kHz
40 kHz
33 kHz
adjusting
S1
#4
#5
ON
ON
ON
ON
ON
ON
Frequency at TP1
408 kHz
328 kHz
272 kHz
3-6
Adjusted properly
#6
#7
OFF
ON
ON
OFF
OFF
OFF
#8
ON
ON
ON
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