Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
AC bridge circuits
Member rating: No Rating | Words: | Submitted: Tue Mar 15 2005
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
AC bridge circuits As we saw with DC measurement circuits, the circuit configuration known as a bridge can be a very useful way to measure unknown values of resistance. This is true with AC as well, and we can apply the very same principle to the accurate measurement of unknown impedances. To review, the bridge circuit works as a pair of two-component voltage dividers connected across the same source voltage, with a null-detector meter movement connected between them to indicate a condition of "balance" at zero volts: Any one of the four resistors in the above bridge can be the resistor of unknown value, and its value can be determined by a ratio of the other three, which are "calibrated," or whose resistances are known to a precise degree. When the bridge is in a balanced condition (zero voltage as indicated by the null detector), the ratio works out to be...
To see the full version of this document, and 143,648 others
