Leader LAV-191 Audio Tester

The Leader LAV-191 Audio Tester is a self-contained bench instrument integrating an audio signal generator, precision attenuator, and AC millivoltmeter. Designed for production, quality control, education, and service environments, it delivers sine and square wave outputs across 10 Hz to 1 MHz with minimal bench footprint and essential testing capabilities in a single unit.

– Technical Specifications

Audio Generator
• Waveform outputs: Sine and square wave
• Frequency range: 10 Hz to 1 MHz (five decade ranges)
• Frequency accuracy: ±(3% + 1 Hz)
• Sine wave output: >3 Vrms into 600 Ω load
• Sine wave flatness: ±0.5 dB
• Sine wave distortion: 0.05% (500 Hz–20 kHz), 0.4% (50 Hz–200 kHz), 0.8% (20 Hz–500 kHz), 1.5% (10 Hz–1 MHz)
• Square wave output: >3 Vp-p into 600 Ω
• Square wave rise time: 200 ns
• Square wave sag: 5% at 50 Hz
• Output level: Variable 0 to >3 Vrms
• SYNC input impedance: ~10 kΩ; control range ±1%/V

Attenuator
• Attenuation range: 0 to -120 dB (1 dB steps)
• Attenuation accuracy: ±1.5%
• Decibel range accuracy: ±2 dB (0–60 dB to 500 kHz); ±6 dB (60–120 dB to 500 kHz); ±10 dB (60–120 dB to 1 MHz)

AC Millivoltmeter
• Voltage ranges: Twelve ranges, 1.5 mV to 500 V full scale
• Decibel ranges: -80 dBm to +56 dBm (dBV and dBm calibrated)
• Bandwidth: ±2% (20 Hz–100 kHz); ±0.5 dB (10 Hz–1 MHz)
• Accuracy: ±2% of full scale at 1 kHz
• Input impedance: ~1 MΩ
• Meter scales: rms volts, dBV, dBm
• Internal amplifier output: 1 V into 600 Ω

Physical & Power
• Dimensions: 300 mm (W) × 150 mm (H) × 250 mm (D)
• Weight: ~4 kg
• Power: 110/120/220/240 VAC, 50/60 Hz; ~8 VA

– Key Features

• Switchable 600 Ω internal load with external load options
• Dual input channels (LEFT and RIGHT) for stereo measurements
• Banana and phono connectors for generator output
• Dual-range bandwidth specification ensures precision across the audio spectrum
• 1 dB attenuation resolution supports fine-level control in testing workflows

– Typical Applications

Audio equipment manufacturing and incoming inspection; amplifier and receiver characterization; acoustic transducer validation; educational demonstrations in audio engineering curricula; field service and troubleshooting of consumer and professional audio devices.

– Compatibility & Integration

External frequency control via SYNC terminal enables closed-loop test automation. Preamp functionality allows integration with low-level signal sources. Stereo input selection supports simultaneous left/right channel verification without reconfiguration.