Portable Wheatstone Bridge
Product Code : SCL-PLE-11818
The StemAids Portable Wheatstone Bridge is a self-contained, high-precision laboratory instrument engineered for the empirical measurement of unknown electrical resistances. Integrating a four-arm bridge network, a high-sensitivity galvanometer, and an internal battery source into a single ruggedized carrying case, this unit is optimized for field use and academic laboratories. Manufactured to ISO 9001:2015 standards, it facilitates the quantification of resistance through the "null-balance" method, ensuring high accuracy by eliminating the impact of lead resistance.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Bridge Configuration |
Four-arm network (Ratio Arms + Rheostat Arm + Unknown) |
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Measurement Range |
0.01Ω to 10MΩ (Multi-range selectable) |
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Ratio Arms |
Selectable multipliers (e.g., ×0.001,×0.01,×0.1,×1,×10,×100,×1000) |
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Rheostat Arm |
4-decade or 5-decade integrated resistance dials |
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Galvanometer |
Built-in center-zero pointer type with high sensitivity |
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Power Source |
Internal DC battery with provision for external supply |
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Interface |
4mm binding posts for "Unknown Resistance" (Rx) connection |
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Chassis |
Portable, high-impact carrying case with protective lid |
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ISO Compliance Code |
Manufactured under ISO 9001:2015 Quality Management Systems |
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HS Code |
9030.33.00 (Instruments for measuring resistance) |
Key Pedagogical Outcomes (Bloom’s Taxonomy Alignment)
- Null-Balance Interface: Facilitates student visualization of balanced electrical potentials, supporting Electromagnetism Module 101.
- Resistance Quantification: Enables the physical study of electrical components; learners apply the formula Rx=Rs×(P/Q) to determine the value of unknown resistors with high precision.
- Sensitivity Analysis: Supports the analysis of bridge sensitivity; students evaluate how the choice of ratio arms affects the deflection of the galvanometer when the bridge is slightly out of balance.
- Experimental Integrity Evaluation: Allows students to evaluate the impact of temperature and contact resistance on measurements, fostering rigorous laboratory practices.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade seaworthy crating (ISPM-15 compliant). The unit is housed in a shock-absorbent foam insert to protect the delicate galvanometer pivot and the precision-ground rotary switches from transit-induced mechanical stress.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and a factory-verified calibration chart for the internal resistance standards.
- Durability: Tropicalized design featuring anti-corrosion internal contacts and moisture-sealed decades, ensuring consistent accuracy in high-humidity climates.
Direct OEM Sourcing Advantages
Procuring the StemAids Portable Wheatstone Bridge directly ensures vertical manufacturing control:
- Matched Ratio-Arm Resistors: Every internal resistor is precision-matched for temperature coefficient stability, ensuring the bridge remains balanced across varying ambient conditions.
- High-Grade Switch Integration: Direct oversight of the rotary switch assembly ensures low contact resistance (<2mΩ), which is critical for measuring low-ohm resistors accurately.
- Direct Factory Spares Availability: Guaranteed availability of replacement galvanometer movements, knobs, and internal battery compartments to maximize the long-term ROI of laboratory infrastructure.
- Manufacturing Control: Direct oversight of the final assembly ensures that the internal wiring is shielded and non-inductive, allowing the bridge to be used for sensitive measurements without interference from external electromagnetic noise.
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