Table of Contents
How a PMMC meter can be used as voltmeter?
DC voltmeter is a measuring instrument, which is used to measure the DC voltage across any two points of electric circuit. If we place a resistor in series with the Permanent Magnet Moving Coil (PMMC) galvanometer, then the entire combination together acts as DC voltmeter.
What can be measured by PMMC multimeter?
PMMC instruments (i.e. D’Arsonval meters) are only used for measuring the Direct Current (DC) current. If we were to use Alternating Current (AC) current, the direction of current will be reversed during the negative half cycle, and hence the direction of torque will also be reversed.
What instrument measures High Voltage?
The Abraham voltmeter is the most commonly used electrostatic meter in high voltage testing equipment. In this instrument, there are two mushroom shaped hollow metal discs.
How a Pmmc meter can be used as voltmeter and ammeter?
When PMMC is used as a voltmeter, the coil is connected in series with high resistance. The rest of the function is the same as above. The same moving coil can be used as an ammeter or voltmeter to interchange the above arrangement.
What is Pmmc voltmeter?
PMMC Voltmeter. When current carrying conductor placed in a magnetic field, a mechanical force acts on the conductor, if it is attached to a moving system, with the coil movement, the pointer moves over the scale. PMMC instruments have parmanent magnets.
What is high voltage tester?
The high voltage test (also called dielectric strength test or hipot test) can be carried out using AC or DC. As is the case with direct current, the high voltage test detects any sudden rise of current up to a programmed threshold. The short circuit test is maintained by default.
What are measuring equipment used for measuring high AC voltage?
voltmeters
Measurement of high a.c. voltages employ conventional methods like series im- pedance voltmeters, potential dividers, potential transformers, or electrostatic voltmeters.
What is the use of PMMC?
PMMC instruments are only used for measuring the DC quantities and it gives the average of value of the quantity being measured. If we apply AC current to these types of instruments, the direction of current will be reversed during negative half cycle.
Which is used to measure voltage?
As its names implies, a “Voltmeter” is an instrument used for measuring voltage (V), that is the potential difference present between any two points within a circuit.