Test equipment
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test equipment for an FRO lecture

test equipment for an FRO lecture

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Test equipment Presentation Transcript

  • 1. Test Equipment
  • 2. overview
    Measuring things
    General purpose electronic measuring equipment
    Radio test equipment
    Other equipment
    Standards
  • 3. Types of measurement equipment
    Electronic
    Voltage
    Current
    Resistance
    Radio
    SWR meter
    Types
    Digital
    Analogue
  • 4. Measurement Systems
    Effect the system under test (Loading problem)
    Voltmeters takes current
    Ammeters drop voltage
    Resistance of the measurement device
    Accuracy
    Imperfections in the test equipment
    Scales
  • 5. Volt meters
    Analogue meter
    Magnetic coil in a magnetic field
    Spring
    Digital meter
    A-to-D converter
  • 6. Voltmeter
    Measure in parallel
    High resistance in the meter
  • 7. Voltmeter
    Loading problem
    25 V each resistor
    Meter internal voltage = 1 MW
    1/R = 1/1MW + 1/1MW = 500 kW
    I = 50V/1500 kW = 33 mA
    V = 16.6 V
  • 8. Voltmeter
    Accuracy
    99% accuracy
    95% accuracy
  • 9. Voltmeter
    Ranges
    Shunt circuits
  • 10. Ammeters
    Wired in series
    Low internal resistance
    Ranges
    Shunt circuit
  • 11. Ohm meters
    Ammeter + resister and battery
    Using in circuit:
    Turn off power
    Isolate the component
  • 12. Multi-meter
    Voltage, ammeter and ohm meter in one.
  • 13. Ammeters
    Shut circuit
  • 14. Radio Test Equipment
    Antenna output
  • 15. Radio Test Equipment
  • 16. Other equipments
    Oscilloscope
    Signal Generator
  • 17. Standards
    National standards agency
    International standard agency
  • 18. Standards
    Weston cell
    Anode of cadmium and mercury
    Cathode of mercury
    cadmium sulfateoctahydrate
    1.018638 V
  • 19. Standards
  • 20. Questions?