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      Digital and Analogue Audio Analyzer
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      Digital and Analogue Audio Analyzer
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      dS-NET 16 x 2 I/O Switcher
    • VSIO adapterVSIO
      Digital Serial Interface Adapter
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      Filter for digital amplifier tests
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      Production Test System
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      Loudspeaker Test Chamber
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Power Amplifier Testing

Linked Resources:
QUICK STARTS
info icon download icon Power Amplifier 1% THD+N regulated sweep
info icon download icon Power Amplifier 1% THD+N regulation
info icon download icon Power Amplifier Amplitude vs Frequency Sweep
info icon download icon Power Amplifier gain vs frequency sweep
info icon download icon Power Amplifier Nested THD+N vs Frequency sweep
info icon download icon Power Amplifier Nth harmonic vs frequency
info icon download icon Power Amplifier THD+N vs Frequency
info icon download icon Power Amplifier THD+N vs Power sweep

WEBINARS
link icon Beyond THD+N: How does your power amplifier REALLY perform?

RELEVANT PRODUCTS
Low Pass Filter icon Low Pass Filter
dScope Series III icon dScope Series III
dScope Series IIIA icon dScope Series IIIA
dScope Series IIIA+ icon dScope Series IIIA+
The dScope Series III's can perform all the traditional audio measurements associated with power amplifiers - THD+N, Noise, Frequency response, Intermodulation distortion, etc. The dScope's FFT display can also reveal noise and distortion components at a glance, giving information that is not available from simple numerical measurements.

In addition it has several features that are particularly useful for testing of amplifiers:
dScope measured parameters can be plotted on both axes of a Sweep allowing (for example) an amplifier's THD+N to be plotted against output power.

Regulation can be used to determine, for example, the maximum output amplitude of an amplifier by regulating the input of the device (the dScope's output) until the device's output reaches its maximum value. This can also be applied to Sweeps, so for example a Sweep of maximum output power vs frequency can be measured quickly and easily at the click of a button. The dScope's regulation feature is powerful and fast and uses finely-tuned algorithms to home in on its target value as quickly as possible.

Switch-mode digital power amplifiers
Switch-mode amplifiers are becoming more popular and can offer significant power efficiency and size advantages. However they present certain challenges for test and measurement equipment. The basic operation of a switch-mode amplifier involves high-frequency switching between power supply rails, which causes strong signal components outside the audio-band. This signal can interfere with the audio measurement unless steps are taken to remove the high-frequency component from the signal before applying it to the dScope's inputs. Prism Sound's passive low-pass filter allows these high frequency signals to be removed, preventing measurement errors (non-linearities) due to the high slew rates and allowing the dScope to accurately measure the signal in the audio-band.

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  Prism Media Products Limited trading as Spectral Measurement (formerly Prism Sound Test and Measurement); Registered in the UK, Reg. No. 2719511
  Address: Unit 1A, Grovemere House, Lancaster Way Business Park, Ely, Cambridgeshire, CB6 3NW, UK