LDR Characteristics Apparatus
Product Code : SCL-PLE-11743
The StemAids LDR Characteristics Apparatus is a precision laboratory workstation engineered for the empirical study of Light Dependent Resistors (LDRs). Optimized for University-level Semiconductor Physics and TVET Electronics, this apparatus facilitates the quantification of the relationship between light intensity (illumination) and electrical resistance. Manufactured to ISO 9001:2015 standards, it provides a controlled optoelectronic environment for verifying the inverse relationship of photo-conductive cells within institutional laboratories.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Optic Bench / Enclosure |
Light-tight horizontal enclosure or bench with integrated scale |
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Light Source |
Stabilized incandescent lamp with variable intensity control |
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Distance Measurement |
Integrated millimeter (mm) scale to determine 1/d2 intensity |
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Measurement Interface |
Dual Digital/Analog meters for Voltage (V) and Current (I) |
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LDR Type |
High-sensitivity Cadmium Sulfide (CdS) photo-conductive cell |
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Power Supply |
Integrated regulated DC power supply for biased circuit testing |
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Functional Principle |
Photo-conductivity / Inverse Square Law of Illuminance |
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ISO Compliance Code |
Manufactured under ISO 9001:2015 Quality Management Systems |
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HS Code |
9023.00.00 (Educational/demonstrational scientific apparatus) |
Key Pedagogical Outcomes (Bloom’s Taxonomy Alignment)
- Photo-Conductive Interface: Facilitates student visualization of how incident photons decrease the resistance of a semiconductor, supporting Optoelectronics Module 101.
- Resistance-Illuminance Quantification: Enables the physical study of energy gaps, allowing learners to apply data to plot Resistance (R) vs. Intensity (Lux) or Distance (d).
- Inverse Square Law Analysis: Supports the analysis of light propagation by demonstrating that LDR resistance changes proportionally to the square of the distance from the source.
- Sensor Application Evaluation: Allows students to evaluate the sensitivity and response time of LDRs for use in automated street lighting or twilight switches.
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 LDR sensor and integrated meters from vibrational shock during transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and a comprehensive Experiment Guide in English.
- Durability: Tropicalized design featuring anti-corrosion coatings and moisture-resistant PCB layouts for consistent performance in high-humidity regions.
Direct OEM Sourcing Advantages
Procuring the StemAids LDR Characteristics Apparatus directly ensures vertical manufacturing control:
- In-House Precision Calibration: Every unit is batch-tested to ensure the light source intensity and the LDR's spectral response are aligned for linear data plotting.
- Batch-Tested for Uniform Reliability: The internal regulated power supply undergoes a 24-hour stability test to ensure voltage fluctuations do not skew resistance readings.
- Direct Factory Spares Availability: Guaranteed availability of replacement LDR sensors, calibrated lamps, and digital meter modules to maximize long-term laboratory ROI.
- Manufacturing Control: Direct oversight of the light-chamber construction ensures zero ambient light leakage, providing high-fidelity results even in bright classroom environments.
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