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Summary of Contents for Audio Precision AUX-0025
- Page 1 AUX-0025 Switching Amplifier Measurement Filter...
- Page 3 AUX-0025 User’s Manual Installation and Operation of the AUX-0025 Switching Amplifier Measurement Filter...
- Page 4 Audio Precision®, System One®, System Two™, System Two Cascade™, System One + DSP™, System Two + DSP™, Dual Domain®, FASTTEST®, APWIN™, ATS™ and ATS-2™ are trademarks of Audio Precision, Inc. Windows is a trademark of Microsoft Corporation. Published by: 5750 SW Arctic Drive...
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Page 5: Table Of Contents
A Switching Amplifier by any name....2 Features of the AUX-0025 ..... . . 3 Passive design . - Page 6 AUX-0025 User’s Manual...
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Page 7: Safety
Safety The two AUX-0025 front-panel terminals marked with this sign are a chassis common connection. They are NOT a safety ground, and are not intended for use as a safety ground connection. AUX-0025 User’s Manual... - Page 8 AUX-0025 User’s Manual...
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Page 9: Chapter 1 Introduction
Chapter 1 Introduction Figure 1. The Audio Precision AUX-0025 Switching Amplifier Measurement Filter. Audio analyzers are generally designed to have broad measurement bandwidths, broader than a typical audio circuit or system and much wider than the audio passband. Such designs enable accurate analysis of... -
Page 10: A Switching Amplifier By Any Name
(DUT) and the analyzer input to reduce amplitude of the switching carrier before the signal is ranged. The Audio Precision AUX-0025 Switching Am- plifier Measurement Filter fulfills this requirement. -
Page 11: Features Of The Aux-0025
AUX-0025 and the analyzing instrument to help ensure a proper loading. Mounting The AUX-0025 is fitted with resilient feet for tabletop use. It can also be rack-mounted using the optional rack mount adapters available from Au- dio Precision. Being a passive unit, the AUX-0025 does not dissipate ap- preciable power and requires no extraordinary ventilation considerations. - Page 12 Chapter 1: Introduction Features of the AUX-0025 The AUX-0025 should not be mounted close to a source of strong mag- netic fields such as a power transformer. Stray magnetic fields could cause degradation in system residual hum and noise performance.
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Page 13: Chapter 2 Using Your Aux-0025
Audio Precision Switching Amplifier System 2000 Instrument Under Test Figure 3. Diagram of a switching amplifier output properly connected to the AUX-0025 (and analyzer) and to an amplifier load. Connecting the DUT to the AUX-0025 For a DUT with balanced outputs §... -
Page 14: Connecting The Dut To A Load
“dummy load” or an actual loudspeaker. When using the AUX-0025 in a test with a load, be sure that the mea- surement connections are made at the point physically and electrically clos- est to the amplifier output circuitry, rather than at the load. -
Page 15: Typical Waveforms
Figure 5. An second oscilloscope capture of the sane switching amplifier output as shown in Figure 4, after the application the AUX-0025 filter. The switching carrier has been greatly reduced. -
Page 16: Use Of Additional Filters
In many cases you may want to apply additional low-pass filtering within the analyzer. Both the Audio Precision ATS-2 and the System 2000 instruments have additional filtering available. A standardized and very effective technique to reduce out-of-band com- ponents for measurement is the use of the Audio Precision S-AES17 filter set, available for System 2000 Series instruments. -
Page 17: Chapter 3 Specifications
+5º C to +40º C Storage –40º C to +75º C Humidity 80% RH to at least +90º C Dimensions 16.5 x 1.75 x 10.5 inches (41.9 x 4.4 x 26.7 centimeters) Weight 7.2 lb (3.3 kg) unpacked AUX-0025 User’s Manual... - Page 18 Chapter 3: Specifications Filter Response Graphs 100k 200k 500k Figure 6. AUX-0025 overall response showing attenuation beyond the audio band. +0.1 +0.075 +0.05 +0.025 -0.025 -0.05 -0.075 -0.1 Figure 7. AUX-0025 passband response showing flatness out to 20 kHz. AUX-0025 User’s Manual...
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