The RLC Bridge is the single bridge which can be used for measurement of all the three parameters viz., resistance, inductance and capacitance.
It consists of signal source (ac or dc) and a detector along with following inbuilt bridges:
Continue reading What is RLC bridge? Working, Diagram & Applications
The LCR meter is an instrument, that can measure the value of an inductance, capacitance and resistance directly. This may be analog or digital type meter. Continue reading What is LCR (RLC) Meter? Working, Diagram & Specification
In this topic, you study the Difference Between Moving Iron & Moving Coil Instruments.
Continue reading Difference Between Moving Iron & Moving Coil Instruments
In Dynamometer type instruments, the permanent magnet used in moving coil permanent magnet instruments is replaced by either one or two fixed coils which carry the current to be measured (or current proportional to voltage to be measured) and which are connected either in series or in parallel with the moving coil. The coils are usually air cored, the use of iron being usually avoided in such instruments owing to its introduction of hysteresis and eddy current and other errors.
When the instrument is used for A.C. measurements, the general arrangement is shown in Fig. 1. and the connection diagram is shown in Fig. 2.
Fig. 1: Dynamometer type instrument (Actual construction) Continue reading Dynamometer type instrument – Working, Diagram & Construction
In this topc, you study Moving Iron (MI) Instrument or Permanent magnet Moving Iron (PMMI) Instrument Theory, Types, Advantages, Disadvantages & Diagram.
Continue reading What is Moving Iron (MI) Instrument? Theory, Types & Diagram
Two Wattmeter Method of power measurement can be used for both the balanced or unbalanced loads of 3 Φ 4 wires or 3 Φ 3 wire systems. In this method two wattmeters are connected as shown in Fig. 1. The current coils are connected in series with the load and the pressure coils are connected across the line voltage. The total power consumed by the load is the algebraic sum of both wattmeters reading keeping in view the value of power factor of the load i.e.
p = W1 + W2
In this method, the current coil of the two wattmeters are connected in any of the two lines and the potential coil of both wattmeters are connected with the left third line, in which no wattmeter is connected. Continue reading Two Wattmeter Method of Power Measurement
In this topic, you study the difference between ammeters and voltmeters.
Continue reading Difference between Ammeters and Voltmeters
In this topic, you study the Difference between Current Transformer (CT) and Potential Transformer (PT).
Continue reading Difference between Current Transformer (CT) and Potential Transformer (PT)
In this topic, you study Potential Transformer (PT) – Working, Construction & Diagram.
Continue reading What is Potential Transformer (PT)? – Working, Construction, Applications & Diagram
In this topic, you study the definition, working, construction, types & connection diagram of phase sequence indicator. Continue reading What is Phase Sequence Indicator? – Definition, Working, Construction, Types & Diagram