Recorders record electrical and non-electrical quantities over time to analyze processes. There are analog and digital recorders. Analog recorders include graphic recorders like X-Y and strip chart recorders that produce a pen and ink record. X-Y recorders graphically record the relationship between two variables using potentiometers to move a pen in perpendicular X and Y axes. Magnetic tape recorders record signals as magnetic patterns on tape for later playback, allowing direct high-fidelity recording of high frequencies.

1. RECORDERS

2. • A recorder records electrical & non-electrical
quantities as a function of time.
• This record may be written or printed, and later on,
can be examined and analyzed to obtain a better
understanding and control of the processes.
RECORDERS

3. • Paper chart – to record information
• Stylus- writing instrument
• Interfacing apparatus
BASIC ELEMENTS

4. TYPES OF RECORDERS
Recorders
Analog
Graphic
recorders
Oscillographic
recorders
Magnetic tape
recorders
Digital
Digital Tape
recorders

5. Display and store a pen and ink record of the history of
some physical event.
 X-Y Recorders
 Strip chart Recorders
GRAPHIC RECORDERS

6. • A X-Y recorder is an instrument
which gives a graphic record of
the relationship between two
variables
• Pen moves in two axes X,Y.
X-Y RECORDER

7. X-Y RECORDER

9. There are two self balancing potentiometers -
 One moves a recording pen in X direction and controls the
position of rolls.
 The Other moves the recording pen in Y direction at
right angles to the X and controls the position of the
recording pen.
Emf is used for operation of X-Y recorders.
The construction consists of pair of servo systems,
recording pens and attenuators.
CONSTRUCTION OF X-Y RECORDER

10. A signal enters each of two channels and are attenuated
to the inherent range, then passed to a balance circuit
and compared with reference voltage.
The difference between the input signal voltage and the
reference voltage is fed to a chopper which converts dc
to dc signals.
The signal is then amplified. Servo-meter is actuated, the
system is balanced and hold it in balance as the value of
quantity being recorded.
WORKING OF X-Y RECORDER

11. o Sensitivity of
10microvolt/mm.
o Slewing speed of 1.5 m/s.
o Used in torque-speed
characteristics of motor.
o Plotting stress and strain
curves.
o Regulation curves of power
supplies.
ADVANTAGES OF X-Y RECORDER

12. PRINCIPLE:
When a magnetic tape
is passed through a
recording head any signal
recorded on the tape appears
as magnetic pattern
dispersed in space along the
tape, similar to the original
coil current variation with
time.
MAGNETIC TAPE
RECORDER

14. ADVANTAGES OF MAGNETIC
RECORDER
 Direct recording
Frequency modulation recording
Pulse duration modulation
recording
Used for high frequencies
High resolution applications
High fidelity
Magnetic Modulation of data.