By B.A. Gregory
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Additional resources for An Introduction to Electrical Instrumentation: A guide to the use, selection, and limitations of electrical instruments and measuring systems
A high input impedance instrument, on d. c. its resistance being that of the leakage path through the insulation. Nonlinear scale, approximately square law, but this way be modified by the shape of the vanes. d. 19, the use of a strip suspension eliminating bearing friction. 19. Multiple vane, medium voltage electrostatic voltmeter For higher voltages the gaps between fixed and moving vanes may be increased and the number of vanes reduced. v. may be used as a wattmeter 1•4 . In the electrometer instrument there are two sets of fixed plates and a pair of moving vanes, so that AN INTRODUCTION TO ELECTRICAL INSTRUMENTATION 26 applying a voltage difference (proportional to current) between the sets of fixed plates enables this type of electrostatic voltmeter to be used as a wattmeter.
Voltages such as the output from thermocouples when the display could conveniently be inK or °C. C. s. responding. s. value and most instruments are calibrated is terms of this, but should instruments of the first two types be used to measure nonsinusoidal waves, errors will result 7 . 24. It is this instrument that measures the 'average' value of the positive half, the negative half, or the total waveform of a. c. 24. 'Average' measuring electronic voltmeter a cycle, depending on the type of rectification used.
6 ELECTROSTATIC INSTRUMENTS This type of instrument depends on the forces set up between charged plates to obtain a deflecting torque. 18. 18. The control torque is derived from a spring system and damping is usually pneumatic. s. values, because the deflecting torque is proportional to 0 and can therefore be used as a transfer instrument. , and for a. c. where it constitutes a capacitive load, this limiting its general application to frequencies below l 00 Hz. However, 25 ANALOG (POINTER) INSTRUMENTS it may be used to radio frequencies4 where it could be employed for aerial tuning.
An Introduction to Electrical Instrumentation: A guide to the use, selection, and limitations of electrical instruments and measuring systems by B.A. Gregory
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