MICROPOTENTIOMETER RESISTOR TEST FIXTURE

摘要

The D-42 Micropotentiometer Reciater Test Fixture is designed to test the resistance of the output resistors used in the D-39 Micro potentiometer. Some of these resistors are as low in value as one milliohm. It is necessary to test these as four terminal resistors in order to know that the value of output voltage as indicated by the D-39 is accurate. In operation, a resistor- is placed in the receptacle of the D-42. And an accurately-known current is passed through the two terminals mounted on the chassis. The terminals on the contact support are adjusted-to bear firmly on the center contact solder ring of the resistor and upon the outer contact ring. The voltage appearing at the two elevated terminals may now be divided by the current previously introduced. The resulting quotient is the resistance of the output resistor as seen at the two contact solder rings.