Home Electric Circuits and Instrumentation Unit 5: Recorders, Transducers & Digital Test Instruments Recorders

X-Y recorder

A strip chart recorder records the variations of a quantity with respect to time while a X-Y recorder is an instrument which gives a graphic record of the

relationship between two variables.

In strip recorders, usually self-balancing potentiometers are used. These self-balancing potentiometers plot the emf as a function of time. In X-Y

recorders, an emf is plotted as a function of another emf. This is done by having one self-balancing potentiometer control the position of the rolls. while

another self-balancing potentiometer controls the position of the recording pen.

In some X-Y recorders, one self-balancing potentiometer circuit moves a recording pen in the X direction while another self-balancing potentiometer circuit

moves the recording pen in the Y direction at right angles to the X direction, while the paper remains stationary.

There are many variations of X-Y recorders. The emf, used for operation of X-Y recorders, may not necessarily measure only voltages. The measured emf

may be the output of a transducer that may measure displacement force, pressure, strain , light intensity or any other physical quantity. Thus with the

help of X-Y recorders and appropriate transducers, a physical quantity may be plotted against another physical quantity.

Hence an X-Y recorder consists of a pair of servo-systems, driving a recording pen in two axes through a proper sliding pen and moving arm arrangement,

with reference to a stationary paper chart. Attenuators are used to bring the input signals to the levels acceptable by the recorder.

This figure shows a block diagram of a typical X-Y recorder. A signal enters each of the two channels. The signals are attenuated to the inherent full scale

range of the recorder, the signal then passes to a balance circuit where it is compared with an internal reference voltage. The error signal the difference

between the input signal voltage and the reference voltage is fed to a chopper which converts d.c signal to an a.c signal. The signal is then amplified in

order to actuate a servometer which is used to balance the system and hold it in balance as the value of the quantity being recorder changes. The action

described above takes place in both axed simultaneously. thus we get a record of one variable with respect to another.

The use of X-Y recorders in laboratories greatly simplifies and expedites many measurements and tests. A few examples are being given below

Speed torque characteristics of motors1.

lift Drag wind tunnel tests2.

Plotting of characteristics of vaccum tubes, zener diodes rectifiers and transistors etc3.

Regulation curves of power supplies4.

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Strip chart recorder up Transducers

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Plottering stress-strain curves, hysteresis curves and vibrations amplitude against swept frequency5.

Electrical characteristics of materials such as resistance versus and temperature plotting the output from6.

electronic calculators and computers7.

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Xy-recorder | Define Xy-recorder at Dictionary.comXy-recorder definition, an instrument that draws a graph of the relationship between two experimental variables. See more.

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Chart recorder - Wikipedia, the free encyclopediaA chart recorder is an electromechanical device that records an electrical or mechanical ... An "X-Y" recorder drives the chart depending on the valueof another ...

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