| 摘要 |
An oscillator provides an oscillation signal which is rectified and applied to a selectively dischargable capacitor. A control circuit monitors the charge on the capacitor and controls the cyclic operation of the oscillator to maintain the charge on the capacitor within predetermined limits, giving a visual signal indicative thereof. Temperature compensation means are included to terminate the operation of the oscillator while the temperature of the oscillator exceeds a predetermined value.
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