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1. FREQUENCY TELEMETRY
2. POSITION TELEMETRY
3. MULTIPLEXING IN TELEMETRY
TELEMETRY
PREPARED BY
1. SAGHEER AHMED 12-03
2. HARIS KHAN 12-39
DEPARTMENT OF ELECTRONICS
SEMISTER VI
INTRODUCTION
• IN MODERN INSTRUMENTATION SYSTEM COMPONENTS OF
THE SYSTEM ARE LOCATED AT A DISTANCE.
• IT IS NESSESARY TO TRANSMIT MEAURED DATA.
• TELEMETRY IS THE SCIENCE OF MEAURING DATA AT A
DISTANCE.
• USED IN COMMERCIAL, INDUSTRIAL, MILTARY AND SPACE
OPERATIONS.
• TELEMETRY INVOLVES THE CONVERSION OF
MEAURED DATA INTO REPRESENTATIVE SIGNAL .
• ON THE BASIS OF ELECTRICAL SIGNAL IT CAN BE
CLASSIFIED INTO DIFFERENT TYPES SUCH AS
VOLTAGE, CURRENT, POSITION AND FREQUENCY
TELEMETRY.
• HERE WE DISCUSS POSITION, FREQUENCY AND
MULTIPLEXING IN TELEMETRY.
FREQUENCY TELEMETRY
• MEAURED MAGNITUDES ARE REPRESENTED
BY AN ALTRNATING CURRENT OR VOLTAGE OF
VARYING FREQUENCY.
• SMALL VARIABLE CAPISTOR IS MECHANICALLY
ATTACHED TO THE SHAFT OF INSTRUMENT.
• THIS CAPISTOR IS ELECTRICALLY ATTACHED TO
THE OSCILATOR CIRCUIT
• OUTPUT FREQUENCY VARIES ACCORDING TO
THE INSTRUMENT READING.
VARIBLE CAPISTORS
INTERNAL STRUCTURE OF VARIABLE
CAPISTOR
VARYING AREA
VARYING DISTANCE BETWEEN
PLATES
PRESSURE SENSING INSTRUMENT
• THE VARYING FREQUENCY IS TRASMITTED TO
RECEIVING END OVER ACHANNEL.
• CHANNEL CAN BE WIRES OR WIRELESS MEDIA.
• AT RECEIVER END THIS VARYING FREQUENCY
OPERATES A DIRECT READING FREQUENCY METER
CALIBRATED IN THE UNITS OF QUANTITY MEAURED
AT TRANSMITTED END.
• BUT NOW A DAYS INCOMING FREQUENCY
CONTROL THE MAGNITUDE OF PROPORTIONAL
DIRECT CURRENT OR VOLTAGE.
APPLICATIONS
• REMOTE PRESSURE READING
• FUEL OIL MONITORING
• LPG TANK MONITORING
• WATOR LEVEL MONITORING
• REMOTE METER READING
• REMOTE SPEED READING
POSITION TELEMETRY
• TRANSMITTING INSTUMENT ADJUST THE
RELATION BETWEEN THE SIGNAL IN
CORRESPONDING TO THE MEAUREMENT.
• RECEIVING INSTRUNENT CONVERT THESE
SIGNAL INTO DISPLACEMENT.
• MECHANICAL PART REPRESENT THESE
MEAUREMENTS.
• OPERATION IS BASED UPON COMPARISON OF TWO
OR MORE ELECTRICAL MAGNITUDES.
• REQUIRE ATLEAST THREE CONDUCTORS BETWEEN
TRANSMITTING AND RECEIVING UNITS.
MULTIPLEXING IN TELEMETRY
SYSTEMS
• TRANSMISSION OF TWO OR MORE MESSAGES
AT THE SAME TIME OVER SINGLE CHANNEL
• MORE THAN ONE MEAUREMENTS OVER
SINGLE CHANNEL.
• COST, SPACE AND WEIGHT INCREASE BY
USING SEPARATE WIRES.
• WE DO NOT REQUIRE SEPARATE WIRE FOR
EACH MEAURAND IN MULTIPLEXING.
15
Multiplexing
• Two or more simultaneous transmissions
on a single circuit.
– Transparent to end user.
• Multiplexing costs less.
EEG ACQUISITION SYSTEM
• IN MULTIPLEXING CHANNELIS SHARED BETWEEN
THE VARIOUS QUANTITIES EITHER BY TIME
DIVISION BASIS OR FREQUENCY DIVISION BASES.
• TWO METHODS OF MULTIPLEXING.
• TIME DIVISION MULTIPLEXING (TDM)
• FREQUENCY DIVISION MULTIPLEXING (FDM)
18
Assignment of non-overlapping frequency ranges to each
“user” or signal on a medium. Thus, all signals are
transmitted at the same time, each using different
frequencies.
A multiplexor accepts inputs and assigns frequencies to each
device.
The multiplexor is attached to a high-speed communications
line.
A corresponding multiplexor, or demultiplexor, is on the end
of the high-speed line and separates the multiplexed signals.
Frequency Division
Multiplexing
19
COMPUTER NETWORKS CONNECTED THROUGH
ONE CHANNEL USING FDM
THE END

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Telemetry types, frequency,position and multiplexing in telemetry

  • 1. 1. FREQUENCY TELEMETRY 2. POSITION TELEMETRY 3. MULTIPLEXING IN TELEMETRY TELEMETRY
  • 2. PREPARED BY 1. SAGHEER AHMED 12-03 2. HARIS KHAN 12-39 DEPARTMENT OF ELECTRONICS SEMISTER VI
  • 3. INTRODUCTION • IN MODERN INSTRUMENTATION SYSTEM COMPONENTS OF THE SYSTEM ARE LOCATED AT A DISTANCE. • IT IS NESSESARY TO TRANSMIT MEAURED DATA. • TELEMETRY IS THE SCIENCE OF MEAURING DATA AT A DISTANCE. • USED IN COMMERCIAL, INDUSTRIAL, MILTARY AND SPACE OPERATIONS.
  • 4. • TELEMETRY INVOLVES THE CONVERSION OF MEAURED DATA INTO REPRESENTATIVE SIGNAL . • ON THE BASIS OF ELECTRICAL SIGNAL IT CAN BE CLASSIFIED INTO DIFFERENT TYPES SUCH AS VOLTAGE, CURRENT, POSITION AND FREQUENCY TELEMETRY. • HERE WE DISCUSS POSITION, FREQUENCY AND MULTIPLEXING IN TELEMETRY.
  • 5. FREQUENCY TELEMETRY • MEAURED MAGNITUDES ARE REPRESENTED BY AN ALTRNATING CURRENT OR VOLTAGE OF VARYING FREQUENCY. • SMALL VARIABLE CAPISTOR IS MECHANICALLY ATTACHED TO THE SHAFT OF INSTRUMENT. • THIS CAPISTOR IS ELECTRICALLY ATTACHED TO THE OSCILATOR CIRCUIT • OUTPUT FREQUENCY VARIES ACCORDING TO THE INSTRUMENT READING.
  • 7. INTERNAL STRUCTURE OF VARIABLE CAPISTOR VARYING AREA VARYING DISTANCE BETWEEN PLATES
  • 9.
  • 10. • THE VARYING FREQUENCY IS TRASMITTED TO RECEIVING END OVER ACHANNEL. • CHANNEL CAN BE WIRES OR WIRELESS MEDIA. • AT RECEIVER END THIS VARYING FREQUENCY OPERATES A DIRECT READING FREQUENCY METER CALIBRATED IN THE UNITS OF QUANTITY MEAURED AT TRANSMITTED END. • BUT NOW A DAYS INCOMING FREQUENCY CONTROL THE MAGNITUDE OF PROPORTIONAL DIRECT CURRENT OR VOLTAGE.
  • 11. APPLICATIONS • REMOTE PRESSURE READING • FUEL OIL MONITORING • LPG TANK MONITORING • WATOR LEVEL MONITORING • REMOTE METER READING • REMOTE SPEED READING
  • 12. POSITION TELEMETRY • TRANSMITTING INSTUMENT ADJUST THE RELATION BETWEEN THE SIGNAL IN CORRESPONDING TO THE MEAUREMENT. • RECEIVING INSTRUNENT CONVERT THESE SIGNAL INTO DISPLACEMENT. • MECHANICAL PART REPRESENT THESE MEAUREMENTS.
  • 13. • OPERATION IS BASED UPON COMPARISON OF TWO OR MORE ELECTRICAL MAGNITUDES. • REQUIRE ATLEAST THREE CONDUCTORS BETWEEN TRANSMITTING AND RECEIVING UNITS.
  • 14. MULTIPLEXING IN TELEMETRY SYSTEMS • TRANSMISSION OF TWO OR MORE MESSAGES AT THE SAME TIME OVER SINGLE CHANNEL • MORE THAN ONE MEAUREMENTS OVER SINGLE CHANNEL. • COST, SPACE AND WEIGHT INCREASE BY USING SEPARATE WIRES. • WE DO NOT REQUIRE SEPARATE WIRE FOR EACH MEAURAND IN MULTIPLEXING.
  • 15. 15 Multiplexing • Two or more simultaneous transmissions on a single circuit. – Transparent to end user. • Multiplexing costs less.
  • 17. • IN MULTIPLEXING CHANNELIS SHARED BETWEEN THE VARIOUS QUANTITIES EITHER BY TIME DIVISION BASIS OR FREQUENCY DIVISION BASES. • TWO METHODS OF MULTIPLEXING. • TIME DIVISION MULTIPLEXING (TDM) • FREQUENCY DIVISION MULTIPLEXING (FDM)
  • 18. 18 Assignment of non-overlapping frequency ranges to each “user” or signal on a medium. Thus, all signals are transmitted at the same time, each using different frequencies. A multiplexor accepts inputs and assigns frequencies to each device. The multiplexor is attached to a high-speed communications line. A corresponding multiplexor, or demultiplexor, is on the end of the high-speed line and separates the multiplexed signals. Frequency Division Multiplexing
  • 19. 19 COMPUTER NETWORKS CONNECTED THROUGH ONE CHANNEL USING FDM
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