Rohde & Schwarz APN62 Audio Frequency Generator

The Rohde & Schwarz APN62 is a synthesized audio frequency generator delivering precise signal generation across 1 Hz to 260 kHz with crystal accuracy and phase-continuous tuning. Output ranges from 50 µV to 20 Vrms with adjustable source impedance (10 Ω to 640 Ω), supporting balanced floating, balanced grounded, and unbalanced grounded configurations. The integrated output transformer spans 20 Hz to 25 kHz into 2 kΩ. Distortion remains below 0.05% across the audio band to 20 kHz and below 0.1% to 100 kHz, with typical performance of −80 dBc to 20 kHz. Frequency resolution reaches 0.1 Hz up to 20 kHz, then 1 Hz to 260 kHz. The APN62 generates sine, square, triangle, and sawtooth waveforms with independent sweep functions—frequency sweep, level sweep over 20 dB, and linear or logarithmic modes. Output levels display in V, dBV, dBu, or dBm with ±1.0 dB flatness and <1.2 dB attenuator error.

– Technical Specifications

Frequency & Signal Generation
• Frequency range: 1 Hz to 260 kHz
• Frequency resolution: 0.1 Hz to 20 kHz; 1 Hz from 20 kHz to 260 kHz
• Digital synthesis with crystal accuracy
• Phase-continuous, transient-free adjustments

Output
• Level range: 50 µV to 20 Vrms (100 µV to 30 V into 2 kΩ)
• Level resolution: 10 µV or 0.1 dB minimum
• Source impedance: 10 Ω to 640 Ω (5 Ω steps)
• Output transformer: 20 Hz to 25 kHz / 2 kΩ
• Configurations: balanced floating, balanced grounded, unbalanced grounded

Performance
• THD: <0.05% to 20 kHz; <0.1% to 100 kHz; typical −80 dBc to 20 kHz
• Frequency response: <±1.0 dB
• Attenuator error: <1.2 dB

Waveforms & Sweep
• Sine, square, triangle, sawtooth
• Frequency sweep and 20 dB level sweep (linear or logarithmic)

– Key Features

• Remote control via IEEE 488 (HP-IB)
• Option APN-B1: reference-frequency synchronization and frequency/level tracking output
• Dimensions: 435 mm × 103 mm × 350 mm; 7.5 kg
• Power: 94–127 V, 188–265 V; 45–440 Hz
• Operating temperature: 0 to 55 °C
• Safety class I to VDE 0411 (IEC 348)
• Shock tested to DIN 40046 part 7 (30 g); vibration tested to DIN 40046 part 8 (5–55 Hz, 2 g)

– Typical Applications

Audio equipment testing, precision signal measurement, research and development, quality control, and laboratory measurement environments requiring low-distortion signals and flexible output impedance matching.

– Compatibility & Integration

Full remote operation via IEEE 488 interface. Optional synchronization module enables external reference locking and analog tracking outputs proportional to frequency or level.