The Audio Precision APx525 is a high-performance, two-channel audio analyzer designed for R&D, design validation, and production testing. It features versatile analog and standard digital I/O, combining extreme accuracy with the powerful APx500 measurement software.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | USB 2.0 (PC connection), AUX Control, Trigger I/O, Reference Clock I/O |
| Display | None (PC software controlled) |
| Warm-up Time | 20 minutes |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100 - 240 V AC, 50/60 Hz, 120 VA maximum |
| Operating Temperature | 5 to 45 |
| Dimensions (W×H×D) | 432 x 146 x 451 |
| Weight | 9.3 |
System Performance & Metrology
| Parameter | Value |
|---|---|
| System Bandwidth | 10 Hz to 90 kHz |
| Frequency Accuracy | ±3 ppm |
| System Residual THD+N | ≤ -105 dB + 1.4 µV (typically < -110 dB at 1 kHz, 2.5 V) |
| System Amplitude Flatness | ±0.008 dB (20 Hz to 20 kHz) |
| Input-to-Output Crosstalk | ≤ -120 dB (10 Hz to 20 kHz) |
| Sampling Rate Range (A/D & D/A) | Up to 192 kHz |
Analog Generator (Source) Specifications
| Parameter | Value |
|---|---|
| Generator Channels | 2 |
| Output Configurations | Balanced (XLR), Unbalanced (BNC) |
| Output Impedance (Balanced) | 100 ̧, 150 ̧, or 600 ̧ |
| Output Impedance (Unbalanced) | 50 ̧, 100 ̧, or 600 ̧ |
| Maximum Output Amplitude (Balanced) | 21.21 Vrms (28.75 dBu) |
| Maximum Output Amplitude (Unbalanced) | 10.61 Vrms (22.73 dBu) |
| Amplitude Accuracy (Generator) | ±0.03 dB at 1 kHz |
| Amplitude Flatness (Generator) | ±0.008 dB (20 Hz to 20 kHz) |
| Frequency Range (Generator) | 0.1 Hz to 80.1 kHz |
| Frequency Resolution | 0.001 Hz |
| Waveforms | Sine, Sine+DC, Split Sine, Var Phase Sine, Dual Sine, Square, Noise, IMD |
| Residual THD+N (Generator) | ≤ -105 dB + 1.4 µV (at 1 kHz) |
| Inter-channel Crosstalk (Generator) | ≤ -120 dB (10 Hz to 20 kHz) |
| Output Coupling | AC or DC |
Analog Analyzer (Receiver) Specifications
| Parameter | Value |
|---|---|
| Analyzer Channels | 2 |
| Input Configurations | Balanced (XLR), Unbalanced (BNC) |
| Input Impedance (Balanced) | 200 kΩ |
| Input Impedance (Unbalanced) | 100 kΩ |
| Maximum Rated Input Voltage | 160 Vrms (230 Vpk) |
| Frequency Range (Analyzer) | 10 Hz to 90 kHz |
| Amplitude Measurement Accuracy | ±0.03 dB at 1 kHz |
| Amplitude Flatness (Analyzer) | ±0.008 dB (20 Hz to 20 kHz) |
| Residual THD+N (Analyzer) | ≤ -105 dB + 1.4 µV |
| Residual Noise (Analyzer) | ≤ 1.4 µVrms (20 kHz BW) |
| Common Mode Rejection Ratio (CMRR) | ≥ 80 dB (10 Hz to 5 kHz) |
| Crosstalk (Inter-channel Analyzer) | ≤ -120 dB (10 Hz to 20 kHz) |
| Input Coupling | AC or DC |
Filters & Signal Conditioning
| Parameter | Value |
|---|---|
| Weighting Filters | A-weighting, C-weighting, CCIR, CCITT, ITU-R 468 |
| User-defined Filters | Supported via custom coefficient upload |
Digital Audio I/O Specifications
| Parameter | Value |
|---|---|
| Digital Interface Formats | AES3 (AES/EBU), S/PDIF (coaxial), TOSLINK (optical) |
| Digital Output Impedance (AES3) | 110 Ω |
| Digital Output Impedance (S/PDIF) | 75 Ω |
Measurement Modes & Capabilities
| Parameter | Value |
|---|---|
| Measurement Functions | THD+N, THD, IMD, Frequency Response, Phase, Group Delay, FFT Spectrum |
| IMD Standards | SMPTE, MOD, DFD |
| FFT Size | Up to 1.2M points |
| FFT Windowing Types | Hann, Blackman-Harris, Flat Top, Rife-Vincent, Hamming |
Connectivity & Interfaces
| Parameter | Value |
|---|---|
| Analog Inputs | 2 x XLR Female |
| Analog Outputs | 2 x XLR Male |
| Digital Inputs | 1 x XLR (AES3), 1 x BNC (S/PDIF), 1 x TOSLINK |
| Digital Outputs | 1 x XLR (AES3), 1 x BNC (S/PDIF), 1 x TOSLINK |
| Reference I/O | BNC (Ref In, Ref Out) |
| Trigger I/O | BNC (Trigger In, Trigger Out) |
| Monitor Output | 1/4" (6.35 mm) headphone jack (front panel) |
Software & Automation
| Parameter | Value |
|---|---|
| Control Software Suite | APx500 Control Software |
| Automation APIs | Python, LabVIEW, MATLAB, .NET |
Physical, Power & Environmental
| Parameter | Value |
|---|---|
| Cooling | Forced air (internal fans) |
| Recommended Calibration Cycle | 1 Year |
Hardware Options & Expansion
| Parameter | Value |
|---|---|
| Expansion Slots | 1 slot for optional hardware I/O modules |
| Supported I/O Modules | HDMI+ARC, Bluetooth, PDM, Digital Serial (I2S/TDM), Advanced Master Clock (AMC) |
A/D & D/A Conversion
| Parameter | Value |
|---|---|
| A/D Converter Resolution | 24-bit |
| D/A Converter Resolution | 24-bit |
Phase Measurement
| Parameter | Value |
|---|---|
| Phase Measurement Range | ±180° |
Technology
Audio Test and Measurement
Applications
Audio R&D, Production Line Testing, Design Verification
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