| 摘要 |
<p>ABSTRACT The present invention discloses an apparatus for measuring electrical resistance using a modified Wheatstone bridge circuit. The apparatus includes a DC power source followed by an ammeter and an ON/OFF switch, said switch is connected to a current limiting resistor and is connected to two sets of bank of resistors. One set of the said resistors are followed by unknown squib resistors and other by a potentiometer and galvanometer, and the said potentiometer is followed by another set of bank of resistors. The circuit also incorporates a push button switch connected to the squib resistor, shunt resistor connected across the galvanometer and a selector switch, and the said components are enclosed in an electrostatically safe enclosure. The invention provides an apparatus for addressing the problem of measuring electrical resistance accurately in unsafe conditions. FIG. 3</p> |
