It works on the principle that the torque is generated by the current which induces because of measurand voltage and this torque deflects the pointer of the instrument. In any instrument, if the deflection is directly proportional to the voltage or current to be measured, then they are suitable for dc measurement only. 24 days ago. As a result, the voltage level also reverses along with the current. 0. The standard lead set used is dual-point, Kelvin-style. ... A low-resistance device used to conduct most circuit current away from the meter movement is an ammeter _____. These currents are created by … Current measurements can be made with a variety of test instruments, but the most widely used pieces of test equipment for making current measurements is a digital multimeter. An induction-type instrument can be used as an ammeter, voltmeter, or wattmeter, the induction-type energy meters are more popular. Direct measuring instruments are the most commonly used in engineering practice because they are the most simple and inexpensive. Since the sine-wave shape is most common in electrical measurements, it is the waveshape assumed for analog meter calibration, and the small multiple used in the calibration of the meter is 1.1107 (the form factor: 0.707/0.636: the ratio of RMS divided by average for a sinusoidal waveform). by coachholt5. If we use such kind instrument in ac circuit, the moving system will try to move forward and backward several times within a second. A measuring instrument which is used to measure the electric current in a circuit is known as an ammeter. Induction-type single-phase energy meter is used invariably to measure the energy consumed in an AC circuit in a prescribed period where supply voltage and frequency are constant. Alternating Current (AC) Alternating current describes the flow of charge that changes direction periodically. AC can be produced using a device called an alternator. ... but the current clamp and the Hall effect sensors are the most common. AC is used to deliver power to houses, office buildings, etc. This is an analog signal standard, meaning that the electric current is used to proportionately represent measurements or control signals. The battery impedance tester works by applying an ac current signal across an individual cell and measuring the ac voltage drop caused by that ac current as well as the current in the individual cell. Unit 10 Measuring Instruments DRAFT. The most popular form of signal transmission used in modern industrial instrumentation systems is the 4-20 mA DC standard. answer choices ... One of the most common devices used to measure values of resistance, inductance, and capacitance accurately is. Also their use makes the measurement possible in the shortest time. It will then calculate the impedance. The units of measurement for electric current is amperes (A) Earlier ammeters were laboratory instruments which depend on the earth’s magnetic field for operation. Comparison instruments measure the unknown quantity by comparison with a standard. Generating AC. Played 17 times. Definition: The instrument which measures the voltage or potential difference in volts is known as the voltmeter. Before explaining why these uses for AC current are the most common, it is necessary to understand a little about this type of electricity. The examples of comparison type instruments are DC and AC bridges. AC current travels well over short- and medium-range distances, with little loss of power.
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