Resistance Box 50 Ohms
Product Code : SCL-PLE-11721
The StemAids Resistance Box (50 Ohms) is a high-precision decadic impedance standard engineered for the empirical study of low-resistance DC circuits. Optimized for Secondary and Technical Vocational (TVET) physics, this plug-type apparatus facilitates the quantification of unknown resistance through bridge balancing. Manufactured to ISO 9001:2015 standards, it provides a ruggedized, non-inductive solution for verifying Ohm’s Law and the Laws of Series/Parallel circuits within institutional laboratories.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Total Resistance Range |
1 Ohm to 50 Ohms (Cumulative) |
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Resistor Type |
Non-inductively wound Constantan/Manganin wire coils |
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Accuracy Class |
±0.1% to ±1% (Subject to specific calibration lot) |
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Interface Hardware |
Precision-machined brass blocks with interchangeable tapered plugs |
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Chassis Construction |
Kiln-seasoned hardwood or high-impact polymer enclosure |
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Contact Resistance |
Minimized through high-pressure tapered mechanical fit |
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Functional Principle |
Discrete Resistance Steps / Wheatstone Bridge Standard |
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ISO Compliance Code |
Manufactured under ISO 9001:2015 Quality Management Systems |
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HS Code |
9033.00.00 (Parts and accessories for machines/appliances) |
Key Pedagogical Outcomes (Bloom’s Taxonomy Alignment)
- Discrete Ohmic Interface: Facilitates student visualization of additive resistance in series, supporting DC Network Theory Module 101.
- Bridge Balancing Quantification: Enables the physical study of electrical equilibrium, allowing learners to apply specific 50-ohm sub-increments to achieve a null-point on a galvanometer.
- Non-Inductive Response Analysis: Supports the analysis of pure resistance by utilizing bifilar winding, ensuring student data is not skewed by parasitic inductance during DC experiments.
- Mechanical Integrity Evaluation: Allows students to evaluate the impact of contact resistance by observing how the proper seating of tapered brass plugs affects circuit stability.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade seaworthy crating (ISPM-15 compliant) featuring moisture-barrier lining to protect the brass mechanical interfaces from oxidation during transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and individual batch-calibration reports.
- Durability: Tropicalized design featuring specialized insulation on internal coils, tested for operation in high-humidity laboratory environments (up to 90% RH).
Direct OEM Sourcing Advantages
Procuring the StemAids Resistance Box (50 Ohms) directly ensures vertical manufacturing control:
- In-House Precision Calibration: Every resistor coil is batch-tested against master standards to ensure minimal deviation from nominal values.
- Batch-Tested for Uniform Reliability: Every wooden housing undergoes a controlled seasoning process to ensure the brass blocks remain dimensionally stable and aligned over decades of use.
- Direct Factory Spares Availability: Guaranteed availability of replacement tapered plugs and terminal nuts to maintain complete laboratory sets.
- Manufacturing Control: Direct oversight of the wire-winding process ensures low temperature-coefficient performance, providing consistent data across varying ambient laboratory temperatures.
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