The Audio Precision W&F1-21415-37 is a specialized option module for the System One platform that extends PC-based audio test capabilities to measure rotational wow and flutter in analog playback devices. This option performs precision wow and flutter analysis across multiple industry standards—IEC 60386 (Weighted), DIN 4550, CCIR 409-3, NAB, and ANSI C16.5 (1951)—while also characterizing scrape flutter with FM products extending to 5 kHz. The module measures wow and flutter phenomena in the 0.5 Hz to 200 Hz frequency range using selectable test signal bands: normal operation at 2.80 kHz–3.35 kHz or high-band operation at 10.0 kHz–13.5 kHz for scrape flutter assessment. System One DSP configurations deliver FFT spectrum analysis with 0.06 Hz resolution; optional 1/3 octave bandpass filtering improves sensitivity for individual flutter product analysis.
## Technical Specifications
• **Wow and Flutter Measurement Range:** 0.5 Hz to 200 Hz
• **Test Signal Frequencies (Normal):** 2.80 kHz–3.35 kHz
• **Test Signal Frequencies (High Band):** 10.0 kHz–13.5 kHz
• **Scrape Flutter Detection:** FM products to 5 kHz, peak near 3 kHz
• **FFT Analysis Resolution:** 0.06 Hz
• **Input Impedance:** 100 kΩ ±1%, shunted by 270 pF to ground
• **Input Terminations:** 600 Ω or 150 Ω (±1%); Option E8R substitutes 300 Ω for 150 Ω
• **Maximum Rated Input:** 200 Vpeak / 140 Vrms (main); 100 Vpeak (auxiliary)
• **CMRR:** 70 dB (50 Hz–20 kHz, Vin = 2 V); 50 dB (50 Hz–1 kHz, Vin > 2 V)
• **Generator Output Current:** 120 mA balanced / 240 mA unbalanced (20 Hz–20 kHz)
• **Optional Analysis Filter:** 1/3 octave bandpass
## Key Features
• Dual test signal bands for rotational and scrape flutter measurement
• Multi-standard compliance (IEC, DIN, CCIR, NAB, ANSI)
• High-resolution FFT spectrum analysis to 0.06 Hz
• Selectable input termination configurations
• Auxiliary input for expanded measurement flexibility
## Typical Applications
• Tape deck quality assessment and characterization
• Turntable performance evaluation
• Analog audio transport verification
## Compatibility & Integration
Designed exclusively for the Audio Precision System One platform (SYS-300 series and compatible configurations). Operates with compatible Audio Precision software for System One.
