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Reference)
The following waveforms show the effectiveness of the modification. With
the SC-50/110 processor unit being not modified, a spike noise is observed
at the output terminal on SC-50/110 when the interconnected unit is turned
on. (Fig. 6) After modification, the noise is not observed. (Fig. 7)
Before modification
Condition: SC-50 switched off
Measuring points: CH1: TD1-A (pin #1) on DATA 5 port
CH2: TD1-B (pin #2) on DATA 5 port
Ground lead: SG (=FG) on SC-50
After modification
Fig. 6
Fig. 7