High Precision Backlight VU Meter Head – DB Level Monitor for Amplifier & DAC Audio Systems

Core Advantages

✅ High Precision DB Level MeasurementPrecisely track audio power output and sound pressure fluctuations, restore real audio dynamic level changes, ideal for professional audio debugging and equipment modification.

✅ Backlight Background DesignUniform soft backlight improves visibility greatly, easy to observe pointer data in dim studio, cabinet and dark equipment space.

✅ Wide CompatibilityPerfect match with audio power amplifier, DAC audio decoder, audio mixer, DIY speaker amplifier and various sound pressure detection devices.

✅ Stable Pointer Response & Durable StructureSensitive pointer swing, stable operation during long-time audio working, sturdy meter casing for internal equipment installation.

Core Mechanical Structure

• Movable Component: Dynamic coil structure

• Pointer Material: Nickel silver strip

• Pointer Color: Orange

• Deflection Direction: Left-to-right pointer swing

• Pointer Length: 70 ± 1 mm (measured from central axis to pointer tip)

• Pointer Width: 0.45 ± 0.05 mm

• Installation Mode: Vertical mounting only

Standard Test Environment

Nominal test environment: Ambient temperature 20°C, relative humidity 70%.Testing under regular room temperature & humidity is acceptable if test data remains consistent without deviation.

Electrical Parameters

• Full-scale Current Sensitivity: 1000 μA ±10% (current required for pointer moving from zero scale to full-scale mark)

• Internal Resistance: 100 Ω ±10%

• Insulation Resistance: ≥50 MΩ when tested with 500 VDC between the meter housing and internal circuit

Precision & Tolerance Standard

1. Zero Position Accuracy

   With the meter mounted in standard vertical position, the pointer tip aligns with the zero graduation center. Zero alignment tolerance: ±1 mm.

2. Dynamic Balance Performance

   When the meter is tilted forward and backward by 90° from its standard upright position, pointer offset tolerance shall not exceed ±1 mm.

3. Pointer Sticking Prevention

   Input 3× full-scale instantaneous overcurrent, then slowly lower the current down to 1/2 full-scale value. The pointer must fall back within the 1/3 full-scale mark on the dial.

4. Mechanical Friction Error

   During gradual current rise or drop to a fixed value, pointer reading deviation caused by internal friction is controlled within 1 mm.

5. Damping Braking Response Speed

   Feed 2/3 full-scale rated current instantly; the pointer shall stabilize at the corresponding scale position within 1 second.