| 摘要 |
An electronic apparatus for setting and checking electronic yarn clearer systems, comprising a controllable d.c. amplifying channel having a signal input terminal and at least one control input terminal; a negative feedback loop operatively coupled to said controllable d.c. amplifying channel for compensating for a signal level representing a constant base signal produced by a yarn sensing means of said electronic yarn clearer, said negative feedback loop comprising a switch and a condenser for holding or storing temporarily a compensation potential.
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