基本信息
摘要：789,712. Electric tests. WESTERN ELECTRIC CO., Inc. Jan. 25,1956 [Feb. 4, 1955], No. 2470/56. Class 37. In order to locate the exact position of a P-N junction in a semi-conductor body, the body 1 (Fig. 1) is fed with an alternating voltage through end electrodes 2, 3 and a probe 7, connected to a battery 13, is slowly moved along the semi-conductor body while the current/voltage characteristic is continuously indicated on a cathode-ray oscilloscope 16, the effect of the bias voltage on the probe 7 being to change the C.R.O. display when the probe passes over the P-N junction. The body 1 is illuminated by a lamp 17 so that its photodiode characteristic is utilized to accentuate the in the display. To make the change in the display occur at a more precise location the bias voltage on probe 7 is augmented by pulses of opposite polarity from a further battery 20, the pulses being produced by manual operation of a switch 22. Specifications 727,678 and 748,414 are referred to.
摘要附图：
