Melde's String Vibration Apparatus
.jpeg)
Product Code : SCL-PL-12062
Melde's String Vibration Apparatus (SKU SCL-PL-12062) uses an electromechanical vibrator to set a stretched nylon cord into standing-wave vibration, so students can relate tension, frequency and linear mass density. The vibrator runs from a 6–12 V AC supply at line frequency. It is a standard piece in B.Sc. and engineering physics practicals and senior secondary wave demonstrations. Science Lab Supplies manufactures the set at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, supplying schools, colleges, tender contractors and distributors directly.
Specifications
The vibrator sits on a powder-coated cast-iron base with rubber vibration-damping feet and vibrates at 50 or 60 Hz, locked to the mains frequency. An adjustable bench-clamp pulley guides a braided nylon cord to a hanger with slotted masses of 10–50 g, totalling 100 g.
| Parameter | Value |
|---|---|
| SKU | SCL-PL-12062 |
| Operating voltage | 6–12 V AC via safety terminals |
| Vibration frequency | 50 Hz or 60 Hz, synchronised with line frequency |
| Base | Powder-coated cast iron, rubber vibration-damping feet |
| Cord | High-tensile braided nylon |
| Masses | Slotted, 10–50 g; 100 g total set with hanger |
| Pulley | Adjustable table-clamp pulley assembly |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for Melde's Apparatus
Melde's experiment finds the frequency of the vibrator, and hence of the AC mains, from the loop length of a standing wave on a cord of known tension and mass per unit length. The set supports B.Sc. and engineering physics practicals and Class 11–12 wave demonstrations.
- B.Sc. practical: determining the frequency of AC mains using Melde's arrangement.
- Showing nodes, antinodes and loop patterns of standing waves.
- Comparing the parallel and perpendicular (longitudinal and transverse) arrangements of the vibrator.
- Verifying that loop length grows with the square root of tension.
Connect the vibrator only to a 6–12 V AC source such as a step-down transformer, never directly to the mains, and do not exceed the voltage marked on its terminals.
Standard Scope of Supply
The kit contains the electromechanical vibrator unit with terminal posts, the adjustable table-clamp pulley assembly, the slotted weight set with hanger, a spool of braided nylon string and an instruction manual with sample experiments. The low-voltage AC supply is a separate item.
Packing, MOQ and Lead Time
You can ask for a single apparatus or a batch for a college physics laboratory, and the quotation will show packing, delivery time and price for that quantity. As a physics instruments supplier in India, Science Lab Supplies can include related wave items on it.
Science Lab Supplies holds an Importer-Exporter Code as a registered exporter and can ship to buyers in the UAE, Saudi Arabia, Oman, the Philippines, Nepal and Bangladesh. Reach us through the contact page, collect your items in the enquiry cart, or read the lab tender page for tender supply.
Frequently Asked Questions
What power supply does Melde's apparatus need?
A low-voltage 6–12 V AC supply, typically from a laboratory step-down transformer, connected to the vibrator's safety terminals.
At what frequency does the vibrator work?
At 50 Hz or 60 Hz, following the frequency of the electrical line that feeds the supply.
Is Science Lab Supplies the manufacturer or a trader?
Manufacturer. Science Lab Supplies builds the apparatus at its factory in Saha, Ambala, India, and handles every quotation itself, without traders in between.
What masses are supplied for tension?
Slotted masses from 10 g to 50 g on a hanger, making up a 100 g set, so the tension can be raised in steps.
Related String and Resonance Apparatus
Standing waves on strings sit alongside sonometer and resonance-tube work in many wave practical courses. These Physics Lab items cover those experiments and can be quoted together with Melde's set.
- Apparatus for Investigating the Change of Frequency of Stationary Waves in a string / String with Length, Voltage and Mass Per Unit of String / String Length. — a signal-generator-driven string set with 50–100 g masses.
- Sonometers — laws of vibrating strings.
- Eight-Piece Welch Pattern Tuning Fork Set — a set of tuning forks for resonance work.
- Resonance Apparatus Brass Pipe — resonance in an air column.
Browse the full Physics Lab range or all physics lab equipment.
Last updated: 25 September 2026
