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In series type ohmmeter, full-scale deflection current indicator is marked as

  • In series type ohmmeter, full-scale deflection current indicator is marked as Zero.
  • The full-scale deflection current indicator on a series-type ohmmeter is typically marked as zero when the resistance being measured is at its minimum value and as infinity when the resistance being measured is at its maximum value (an open circuit).
  • The current flowing through the meter in a series-type ohmmeter is proportional to the magnitude of the unknown resistance being measured.
  • Therefore, the meter scale should be calibrated accurately to ensure that the meter accurately indicates the resistance being measured.
  • When the unknown resistance is at its minimum value (terminals A and B shorted), the shunt resistor R2 is adjusted until the meter indicates full-scale deflection.
  • This full-scale deflection current is marked as "0Ω" on the meter scale to indicate that the meter movement is at its maximum position when the resistance being measured is at its minimum value.
  • Conversely, when the unknown resistance is at its maximum value (terminals A and B open), the current flowing through the circuit is zero, causing the meter movement to indicate zero current.
  • This zero current is marked as "∞" on the meter scale to indicate that the meter movement is at its minimum position when the resistance being measured is at its maximum value (an open circuit).