By B.A. Gregory
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Extra resources for An Introduction to Electrical Instrumentation: A guide to the use, selection, and limitations of electrical instruments and measuring systems
6. v. 6. In addition to the traces of the input voltages. the following may be added to the record: (a) (b) Grid lines. v. light through a 'comb' on to the paper. Timing lines. 7. v. recorder fitted with 7-320 fluid damped galvanometers. ) ANALOG (GRAPHICAL) INSTRUMENTS (c) 51 energised from either an internal source of known frequency or from an external source. Trace identification. v. recorders are manufactured with as many as 25 channels, each of which can produce a lOOmm peak to peak trace on a 30-cm width of paper, considerable overlapping of traces may result.
Ranges of multimeters. The voltage ranges are obtained by the use of suitable noninductive series resistors and the current ranges by use of a current transformer (see page 163). 5 THERMOCOUPLE INSTRUMENTS These instruments also employ a technique which enables the moving coil instrument to be used for the measurement of a. c. quantities. c. c. is in this case performed by using the alternating current to heat 22 AN INTRODUCTION TO ELECTRICAL INSTRUMENTATION a small element, the temperature of which is converted to a direct current by a thermocouple attached to it.
02 rl) so that the resonating circuit is fed from a low impedance source. 30 and the current Es . z=---------------- jwL + R + R 8 + . 11) or At this resonant frequency the voltage Eq across the tuned circuit is Eq Thus . 13) Note: If the resistance of the inductor is also low, for example 1 n the magnitude of R 8 will introduce an error in the measurement of Q, that is, apparent Q. ) (or loading of the turned circuit will result) and since the Q of the circuit is also the voltage magnification, the v.
An Introduction to Electrical Instrumentation: A guide to the use, selection, and limitations of electrical instruments and measuring systems by B.A. Gregory