Question

Measurement and Instrumentation - Ranges of DC ammeters and DC voltmeters in Dynamometer Type

Answer 1

In a dynamometer-type instrument, which is often used for measuring both DC currents (ammeters) and DC voltages (voltmeters), the range of measurement refers to the span of values that the instrument can accurately measure. Dynamometer-type instruments use the principles of electromagnetic force and torque to measure current and voltage. Here are the typical ranges for DC ammeters and DC voltmeters in a dynamometer-type instrument:

DC Ammeters:
DC ammeters are used to measure the current flowing through a circuit. The range of a DC ammeter refers to the maximum current that the instrument can accurately measure. Common ranges for DC ammeters in a dynamometer-type instrument are:

0-1 mA (milliampere)
0-10 mA
0-100 mA
0-1 A (ampere)
0-10 A

These ranges cover a wide span of current values, from milliampere to ampere levels.

DC Voltmeters:
DC voltmeters are used to measure the voltage across a circuit or component. The range of a DC voltmeter refers to the maximum voltage that the instrument can accurately measure. Common ranges for DC voltmeters in a dynamometer-type instrument are:

0-1 V (volt)
0-10 V
0-100 V
0-1000 V (also referred to as 1 kV)

These ranges cover a wide span of voltage values, from volts to kilovolts.

It's important to note that these ranges can vary based on the specific instrument's design and application. In some cases, there might be specialized instruments designed for higher or lower ranges. When selecting an instrument for a particular measurement task, it's crucial to choose a range that closely matches the expected value to ensure accurate readings.