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
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. A thermocouple circuit is the term applied to two lengths of dissimilar electric conductor, joined at the ends to form a closed loop (see page 267). If the junctions of the dissimilar metals are maintained at different temperatures a current that may be measured by a sensitive moving coil instrument flows in the loop.
1 ). d. of 40 mY without amplification. Multichannel instruments are manufactured in which a number of movements operate side by side over a multitrack chart1. 2 . To obtain the permanent trace on the chart one of the following may be used. 1. 1 ). In general red ink is used but other colours are available and in an instrumentation display a colour code may be adopted. The frequency limit of recorders incorporating this method of writing is generally of the order of a few hertz, but by using a paper with a waxed surface and a special pen, sophisticated recorders are marketed that have frequency responses up to 40Hz.
V. v. recorders the speed of the paper may be controlled by an externally applied voltage. 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.
An Introduction to Electrical Instrumentation: A guide to the use, selection, and limitations of electrical instruments and measuring systems by B.A. Gregory