Analogue Demonstration Meter Scale Plates for electrical measurements

Description

The Analogue Demonstration Meter Scale Plates, also known as interchangeable demonstration meter scales, analogue meter scale inserts or ammeter and voltmeter replacement scales, are designed for use with compatible educational demonstration meters during electricity and magnetism experiments. These scale plates provide different current and voltage measurement graduations, allowing students to interpret analogue meter readings using the appropriate numerical range. The range includes 12 variations, covering direct current (DC), direct voltage and alternating voltage (AC). Each variation is supplied individually as a scale-only accessory.

The scales are intended for use with selected IEC demonstration meter systems, including compatible demonstration meters supplied without interchangeable scales. Correct compatibility should be confirmed before ordering. Unlike a complete ammeter or voltmeter, a scale plate does not independently measure electrical current or voltage. It must be installed in a compatible measuring instrument with the appropriate electrical configuration. The available DC current scales include 0–5 mA, 0–100 mA, 0–1 A, 0–5 A and 10-0-10 mA. These options support classroom investigations involving different current magnitudes.

The milliampere scales are useful for teaching smaller electrical current values, while the ampere scales provide markings for investigations involving larger currents in suitably rated circuits. The DC voltage scales include 0–10 V, 0–15 V, 0–300 V and 10-0-10 V. Students can compare voltage readings and learn how measurement ranges relate to the quantity being observed. The AC voltage scales are available in 0–10 V, 0–50 V and 0–300 V configurations. These provide alternative graduations for compatible instruments configured to measure alternating voltage. The presence of a 300 V marking does not establish the electrical safety rating of the meter or permit connection to mains electricity. The 10-0-10 mA DC and 10-0-10 V DC variations feature centre-zero scales. Their zero point is positioned between positive and negative reading directions.

These scales are particularly useful for teaching current direction, voltage polarity and reversible electrical effects when paired with an appropriate centre-zero meter movement. Students can observe how pointer deflection changes when circuit conditions or connection polarity are altered, helping connect practical observations with electrical theory. The interchangeable scale arrangement also supports lessons on measurement range selection and full-scale deflection, where students learn the relationship between pointer position and the numerical value represented. During educational demonstrations, teachers can use different scales to explain why the measurement range and meter configuration must correspond to the quantity being measured. The scales are also suitable for replacing compatible scale inserts in existing educational meters, reducing the need to purchase a complete instrument when only the appropriate scale is required.

Safety Precautions: These products are scale accessories only. Verify compatibility with the demonstration meter, its electrical movement and any associated shunts, multipliers or rectifiers before use. Never assume that the printed scale range represents the instrument’s safe electrical rating. Do not connect educational demonstration meters directly to mains electricity unless the complete instrument is specifically rated and approved for that application. Each selected variation is supplied as one demonstration meter scale only. The meter body, pointer mechanism, test leads, power supply and additional electrical apparatus are not included.

LabChoice Australia supplies demonstration meter scales, ammeters, voltmeters and educational electrical apparatus for secondary schools, universities and physics teaching laboratories across Australia.