Specifications

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2.16

Applications Manual

Revision 1.11Prism Sound dScope Series III

3.2.4.2 Suppression of imaging components

Applies to:

EUTs with analogue outputs.

Aim:

To measure the total of HF

imaging components

beyond the audio band which are output from

the

EUT

's D/A converter, as a result of applied audio-band signals.

Method

The analogue output of the EUT is measured with a –20

dBFS

sinusoidal stimulus applied, swept from

10Hz to the

upper band-edge frequency

or 10kHz (whichever is the lower). Components within the

audio band are excluded by using the

standard high-pass filter

. The total RMS amplitude of all the

components above the upper band-edge frequency of the EUT is measured for both channels at each

frequency, and plotted graphically. The greatest result for each channel,expressed in

dBFS

, is also

presented at the end of the test.

3.2.4.3 Output amplitude at full-scale

Applies to:

EUTs with analogue outputs.

Aim:

To determine the amplitude of the analogue outputs of the

EUT

when presented with an input

full-scale amplitude

, with any gain controls set to their nominal position.

Method

During this test any gain controls in the EUT should be adjusted to minimise the potential for overload

in the input circuitry, apart from any output gain controls which should be set to their nominal position.

If the EUT input is being driven in the digital domain, the result is obtained by driving the input with a

997Hz sinusoidal stimulus at 0

dBFS

and recording the RMS output amplitude.

If the EUT input is being driven in the analogue domain, the result is obtained by driving the analogue

input with a 997Hz sinusoidal stimulus whose amplitude is adjusted so as to produce 1% THD+N or

0.3dB amplitude compression (whichever occurs at lower amplitude). The result is 0.5dB below the

RMS output amplitude under this condition.

The result is displayed in dBu and V (RMS) for both channels.