· Electrostatic Instruments are typically used for measuring high voltages and are based on the principle of electrostatic forces between charged plates.
· Their operation is largely independent of the frequency of the measured signal, making them unaffected by frequency variations.
How does the power factor affect the reading of a wattmeter if voltage and current are unaltered?
Which of the following testing methods is NOT used to test an AC energy meter?
A Lissajous patterns on a Cathode Ray Oscilloscope (CRO) has 8 vertical maximum values and 4 horizontal maximum values. The frequency of the horizontal input is 1600 Hz. Determine the frequency of the vertical input?
A moving iron ammeter with a range of 0 to 1 amps has an internal resistance of 50 mΩ and an inductance of 0.1 MH. To increase the range to 0-10 Ampere for all operational frequencies, a shunt coil is connected. The shunt coils resistance in mΩ and time constant in milliseconds are each given as:
When is the error under testing of energy meter directly obtained?
In order to prevent creeping in an energy meter, which of the following measures is adopted?
How does the power factor affect the reading of a wattmeter if voltage and current are unaltered?
