AUX Series Switching Amplifier Measurement Filter

Name: AUX Series Switching Amplifier Measurement Filter
Brand: Audio Precision
SKU: AUX-0025
Availability: InStock

Model AUX-0025 - 2-ch 20 kHz AUX-0040 - 2-ch 40 kHz AUX-0100 - 8-ch 20 kHz

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AUX Series Switching Amplifier Measurement Filter

The Audio Precision AUX-0025 / AUX-0040 / AUX-0100 switching amplifier measurement filters are inserted between the device under test and an analyzer input to reduce out-of-band switching signal components before measurement. They provide signal preconditioning for measurement accuracy in Class-D amplifier test.

The filters use a passive design for optimal performance, with custom inductors designed for high power handling and minimal low-frequency distortion. AUX-0025 (20 Hz–20 kHz) and AUX-0040 (20 Hz–40 kHz) are two-channel filters for two-channel analyzers such as the APx555 and APx52x Series; AUX-0100 is an eight-channel 20 kHz low-pass filter for the APx58x Series.

Key Features

Passive design with custom high-power inductors
AUX-0025: 2-channel, 20 Hz–20 kHz passband
AUX-0040: 2-channel, 20 Hz–40 kHz passband
AUX-0100: 8-channel, 20 Hz–20 kHz passband (for APx58x)
Typically > 50 dB high-frequency rejection

Key Specifications

Number of channels	2 (AUX-0025 & AUX-0040); 8 (AUX-0100)
Frequency response	±0.05 dB, 20 Hz–20 kHz (AUX-0025 dc coupled, AUX-0100 ac coupled); ±0.08 dB, 20 Hz–40 kHz (AUX-0040 dc coupled)
Insertion loss	Typically −0.054 dB
High-frequency rejection	Typically > 50 dB, 250 kHz–20 MHz (AUX-0025 & AUX-0100); > 52 dB, 400 kHz–20 MHz (AUX-0040)
Maximum input	±200 Vpk [140 Vrms], decreasing to 75 Vpk [53 Vrms] at high frequency
Interchannel crosstalk	90 dB at 20 kHz (AUX-0025 & AUX-0040); 82 dB at 20 kHz (AUX-0100)
Distortion	< −110 dB harmonic (70 Vpp, 1 kHz)