eme ppt

VARIOUS RECORDERS

Kawantwala Taher (08EC075) Vyas Umang (08EC073)

WHAT IS RECORDER?

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

BASIC ELEMENTS

Paper chart – to record information

Stylus- writing instrument

Interfacing apparatus

TYPES OF RECORDERS

Recorders

Analog

Graphic recorders

Oscillographic recorders

Magnetic tape

recorders

Digital

Digital Tape recorders

GRAPHIC RECORDERS

Display and store a pen-and-ink record of the history of some physical event.

i) Strip Chart Recorders

ii) X-Y Recorders

GRAPHIC RECORDERS

Instrument records one or more parameters that

change with respect to time. Self balancing or

galvanometer

One or more parameters with respect to some

other- XY recorder

STRIP CHART TYPE

Signal conditioning to drive chart at desired rate

Drives reversible motor

Event marker to mark edges of chart

STRIP CHART RECORDER

STRIP CHART RECORDER

CHART RECORDER

Circular motion, need special paper

CHART RECORDER

METERS

Mechanical

Moving coil

Moving iron

Electromagnetic

Induction meters

Electrostatic

GALVANOMETER TYPE

Galvanometer recorder are uses d’Arsonval’s

movement

But not sensitive

Cost and size advantages

GALVANOMETER TYPE

X-Y RECORDERS

Relationship between two variables

pen moves in two axes

Pen clamped or by creating diff. Pressure to hold

pen

Expensive

Gives time base generator

X-Y RECORDERS

X-Y RECORDERS

X-Y RECORDERS

OSCILLOGRAPHIC

X, Y, inputs

Multiple channels

Time base

X, Y, display

Single ended inputs

Differential inputs

MAGNETIC TAPE RECORDING High frequencies

High resolution (fidelity)

Magnetic modulation of

data

Requires complicated

recording devices

Can be used with strip

chart recorders