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APx555B Audio Analyzer
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APx555B Audio Analyzer
Developed for R&D engineers and production technicians who need the highest possible performance, a broad range of digital I/O options and fast, intuitive software, the Audio Precision APx555B is the standard for audio analyzers. With a typical residual THD+N of −120 dB and over 1 MHz bandwidth, the APx555B surpasses the analog performance of all other audio analyzers, including a 5 dB improvement compared to the legacy 2700 Series analyzer.
APx555B has two balanced and two unbalanced analog inputs and outputs plus digital inputs and outputs via AES/EBU, TOSLINK and S/PDIF. I/O may be expanded with optional Programmable Serial, HDMI2 + eARC, PDM and Bluetooth modules. The Advanced Master Clock (AMC) module comes standard, synchronizing the analyzer with external equipment and enabling jitter generation and analysis.
Key Features
- Typical residual THD+N < −120 dB (1 kHz, 2.0 V)
- Analog bandwidth > 1 MHz
- FFTs up to 1.2 M points (1248K) with full 24-bit resolution
- 2 balanced + 2 unbalanced analog inputs and outputs; AES/EBU, TOSLINK and S/PDIF digital I/O
- Advanced Master Clock (AMC) standard: clock sync, jitter generation and analysis
- Optional modules: Bluetooth 5 / LE Audio, Bluetooth Duo, PDM, PDM 16, Programmable Serial I/O, HDMI2 + eARC
- Optional ADC Test Mode (SW-555ADCTEST), electro-acoustic, POLQA, ABC-MRT and STI software options
- APx500 software: code-free automation and complete API (VB.NET, C#, MATLAB, LabVIEW, Python)
Key Specifications
| Sine frequency range | 0.001 Hz to 80 kHz (DAC); 5 Hz to 204 kHz (analog) |
| Frequency accuracy | 3 ppm (DAC); 30 ppm (analog, Precision Tune) |
| Maximum amplitude (balanced) | 26.66 Vrms |
| Amplitude accuracy | ±0.03 dB |
| Generator flatness (5 Hz–20 kHz) | ±0.008 dB |
| Residual THD+N (22 kHz BW) | −117 dB + 1.0 µV; typically < −120 dB (1 kHz, 2.0 V) |
| Analog output configurations | Unbalanced, balanced (differential & single-ended), CMTST |
| Digital output sampling rate | 27 kS/s to 200 kS/s (27 kS/s to 108 kS/s optical) |
| ADC test VBias range | −0.4 to +4.2 VDC |
| Maximum rated input voltage | 230 Vpk |
| Maximum bandwidth | > 1 MHz |
| IMD measurement | SMPTE, MOD, DFD, DIM |
| Analyzer flatness (10 Hz–20 kHz) | ±0.008 dB |
| Residual input noise (22 kHz BW) | 1.0 µV |
| Individual harmonic analyzer | H2–H10 |
| Max FFT length | 1248K points |
| DC voltage measurement | Yes |
Datasheet available on request.
