The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 1983
Filed:
Sep. 12, 1980
James R Clinton, Seattle, WA (US);
Huntron Instruments, Inc., Lynnwood, WA (US);
Abstract
A signal source in the form of a 60 Hz voltage generator provides a 12 volt peak-to-peak signal to the primary winding of a transformer which has a secondary winding with upper and lower leads and a center tap lead. The voltage between the center tap lead and each of the upper and lower leads is 6 volts when the secondary winding is not loaded. A 5 ohm resistor is connected between the upper lead and ground, while the lower lead is connected to a first test lead. The other test lead is connected to ground. In operation, the test leads are placed across the junction of the semiconductor to be tested. The junction of the lower lead and the first test lead is connected to the input of a first amplifier, the output of which is applied to one of the horizontal deflection plates of an oscilloscope. The center tap lead is connected to the input of a second amplifier which has a variable gain and is designed such that in operation the peak output of the second amplifier is a selected magnitude, regardless of the peak voltage of the input signal, sufficient to provide substantially full vertical deflection on the oscilloscope when applied to one of the vertical deflection plates.