Portable Wheatstone Bridge Apparatus
Product Code : SCL-PLE-11738
The StemAids Portable Wheatstone Bridge is a self-contained, high-accuracy measurement instrument engineered for the empirical determination of unknown electrical resistance (Rx). Optimized for Technical Vocational (TVET), University-level physics, and field engineering, this unit integrates a bridge network, a sensitive galvanometer, and an internal power source into a single ruggedized chassis. Manufactured to ISO 9001:2015 standards, it facilitates the quantification of low-to-medium resistance values with high resolution, verifying the principle of bridge equilibrium within institutional and field environments.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Measurement Range |
1Ω to 10MΩ (Multi-range selection) |
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Bridge Arms |
Four-arm network with precision-ratio dials (0.001 to 1000) |
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Galvanometer |
Built-in center-zero, high-sensitivity null detector |
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Internal Power Source |
1.5V–9V battery compartment (supports external DC input) |
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Accuracy Class |
±0.1% to ±0.5% depending on range selection |
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Control Interface |
Rotary switches for ratio selection and decade resistance steps |
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Chassis Construction |
High-impact ABS "Suitcase" style enclosure with handle |
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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/apparatus for measuring electrical resistance) |
Key Pedagogical Outcomes (Bloom’s Taxonomy Alignment)
- Null-Point Interface: Facilitates student visualization of electrical balance, where zero current through the galvanometer indicates a proportional relationship between known and unknown resistors.
- Resistance Quantification: Enables the physical study of impedance, allowing learners to apply the balance equation R1/R2=R3/Rx to calculate precise values.
- Sensitivity Analysis: Supports the analysis of bridge sensitivity by observing how small changes in the decade dials affect the galvanometer deflection.
- Instrumentation Evaluation: Allows students to evaluate the advantages of bridge-based measurement over standard Ohmmeters, specifically regarding lead resistance compensation and precision.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade seaworthy crating (ISPM-15 compliant) featuring high-density foam molding to protect the sensitive galvanometer movement and rotary switches during transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and a detailed Calibration Certificate in English.
- Durability: Tropicalized design featuring anti-fungal PCB coatings and gasket-sealed controls to ensure reliability in high-humidity or dusty field conditions.
Direct OEM Sourcing Advantages
Procuring the StemAids Portable Wheatstone Bridge directly ensures vertical manufacturing control:
- In-House Precision Resistor Matching: Every internal resistor is aged and batch-matched to ensure the bridge ratios remain stable across a wide temperature range.
- Batch-Tested for Uniform Reliability: Every unit undergoes a "zero-drift" test to ensure the galvanometer returns to center and the mechanical switches maintain low contact resistance.
- Direct Factory Spares Availability: Guaranteed availability of replacement galvanometer units, rotary knobs, and specialized battery holders to maximize long-term laboratory ROI.
- Manufacturing Control: Direct oversight of the internal shielding ensures minimal electromagnetic interference (EMI), providing a "clean" null-point even in electrically noisy environments.
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