Research Report on Analog Panel Voltmeter (Model: imfOO TP-80K)

Abstract

1. Introduction

2. Instrument Design and Specifications

2.1 Physical and Dial Design

• Form Factor: Square panel-mounted design (standard for distribution cabinet integration), with a black plastic casing and a white dial face for high contrast readability.
• Measurement Range: 0–100V, clearly marked with major scale divisions at 20V intervals and minor subdivisions for precise reading.
• Display Element: Red pointer for clear visibility against the white background, aligned with the scale to indicate measured voltage.

2.2 Technical Parameters

2.3 Safety and Compliance

• The "CAT III 300V" rating indicates suitability for use in fixed installations (e.g., distribution cabinets) where transient overvoltages up to 300V may occur, ensuring compliance with industrial electrical safety standards.
• The accuracy class of 2.5 signifies a maximum measurement error of ±2.5V across the 0–100V full scale, aligning with general industrial monitoring requirements.

3. Operating Principle

1. A current proportional to the measured voltage flows through a coil suspended in a magnetic field.
2. The interaction between the coil current and magnetic field generates a torque, causing the coil and attached pointer to rotate.
3. The rotation angle is proportional to the input voltage, with the pointer stopping at a position corresponding to the measured value on the calibrated scale.
4. A restoring spring provides counter-torque to return the pointer to zero when no voltage is applied.

4. Performance Evaluation

4.1 Accuracy and Readability

• The 2.5 accuracy class is suitable for general industrial monitoring (e.g., low-voltage distribution panels), where high precision is not required but reliable trend observation is essential.
• The dial’s fine scale divisions (1V increments between major 20V marks) enable reasonable resolution for detecting small voltage fluctuations.
• The red pointer and high-contrast dial design enhance readability in typical cabinet lighting conditions.

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