By B.A. Gregory
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Additional info for An Introduction to Electrical Instrumentation: A guide to the use, selection, and limitations of electrical instruments and measuring systems
The amount of damping used is also of vital importance, for if the galvanometer is over damped its deflection amplitude will decrease as frequency is increased, while an underdamped galvanometer will produce excessive deflections for frequencies near its natural or resonant frequency. 64 is used, the deflection amplitude is within± 5 per cent of the ideal signal amplitude for frequencies up to 60 per cent of galvanometer ~ a. 9. v. recorder galvanometer. 54 AN INTRODUCTION TO ELECTRICAL INSTRUMENTATION resonant frequency for a sinusoidal input signal.
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. (c) (d) (e) It is a comparatively fragile and expensive instrument. 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.
The chart for such a temperature recorder may be rectangular or circular. 3) one revolution of the chart recording level variations over 24 hours or seven days. - _·son 100'. / 0 . 3. Potentiometric pen recorder with circular display (Courtesy Honeywell Ltd) Rectangular strip chart recorders do not usually incorporate control features but many models are available in which one recorder may be used to log several inputs. ) pens which overlap each other and record the inputs simultaneously, or by replacing the pen by a print wheel geared to a selector switch so that when a particular input is connected to the balancing circuit, a point plus its identifying character is printed on the chart.