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Multi-Range Analog Ammeter. Multi-Range Multiple Full-Scale Values Ranges less than and/or greater than the device’s full-scale value Measure 10 mA with a 0-1 mA device Analog Meter Moving-pointer Works by interaction of magnetic fields. Basic Analog Meter Movement.

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multi range analog ammeter
Multi-Range Analog Ammeter
  • Multi-Range
    • Multiple Full-Scale Values
    • Ranges less than and/or greater than the device’s full-scale value
    • Measure 10 mA with a 0-1 mA device
  • Analog Meter
    • Moving-pointer
    • Works by interaction of magnetic fields

ECE 201 Circuit Theory I

basic analog meter movement
Basic Analog Meter Movement

ECE 201 Circuit Theory I

interaction of magnetic fields basic dc motor
Interaction of Magnetic FieldsBasic DC Motor

Permanent Magnet Magnetic flux from N to S

Current into A and out of BMagnetic flux due to current

ECE 201 Circuit Theory I

resulting ccw rotation
Resulting CCW Rotation

Flux “Bunching”

Mechanical forces on the conductor

ECE 201 Circuit Theory I

extending the range of an ammeter
Extending the Range of an Ammeter
  • Meter movements available in standard full-scale values
  • We have 0 – 1 mA
  • To measure currents greater than 1 mA, we need to “divert” the extra current away from the meter using a “shunt”

ECE 201 Circuit Theory I

calculation of the shunt resistor
Calculation of the Shunt Resistor
  • Measure ILoad
  • Ishunt = ILoad - Imeter
  • Parallel combination of meter and shunt
  • ImeterRmeter = IshuntRshunt
  • Rshunt = Rmeter(Imeter/Ishunt)
  • Need to know Rmeter !

ILoad

Imeter

Ishunt

ECE 201 Circuit Theory I

here s how not to measure the resistance of the meter movement
Here’s how NOT to measure the resistance of the meter movement
  • Do not connect the meter movement to any analog or digital multimeter configured as an ohmmeter!
  • The internal battery will supply too much current and destroy the movement!

ECE 201 Circuit Theory I

preliminary prelab work
Preliminary (Prelab) Work
  • Devise a non-destructive scheme to determine the internal resistance of the meter movement.
  • You may use any equipment or components (power supply, function generator, resistors, potentiometers,etc.).
  • Have your method approved BEFORE you begin the experiment!

ECE 201 Circuit Theory I

calibration of your meter
Calibration of your Meter
  • Measure the same current with the meter you designed and a “standard” (commercial) meter.
  • Plot the reading of your meter as a function of the readings obtained with the standard meter.

ECE 201 Circuit Theory I