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.