Specifications

2.13

Applications Manual

Revision 1.11Prism Sound dScope Series III

3.2.3.6 Input logarithmic-gain stability

Applies to:

EUTs with analogue inputs.

Aim:

To determine the long-term gain stability of the

EUT

input.

Method

The test signal for the input logarithmic-gain stability test is a 997Hz sinusoid 6dB below

full-

scale amplitude

The output amplitude of the EUT is measured for at least one hour. The user is invited to confirm that

the EUT has been adequately warmed-up prior to starting the test. After one hour (or when the test is

manually interrupted) the maximum amplitude variation above and below the first measurement value

is displayed in dB for both channels.

Note that if the test is specified to be made at the analogue output of the EUT, the input logarithmic-

gain stability cannot be separated from the output logarithmic-gain stability, and so the test's menu

button and results are re-designated as the 'system logarithmic-gain stability'.

3.2.3.7 Digital audio input format

Applies to:

EUTs with digital audio inputs.

Aim:

To test the compliance with the specified digital audio input format.

Method

This test displays the dScope's Digital Outputs and Output Channel Status (simple mode) dialogue

boxes so that the operator can vary parameters of the dScope's digital output in order to verify that

any required responses by the EUT happen correctly. After completion of the required tests, the

[Finish]

button on the pop-up should be clicked to complete the test.

3.2.3.8 Jitter susceptibility

The Input jitter susceptibility tests are arranged in the following subsections, which correspond to the

equivalent subsections of the AES17 standard:

Analogue-to-digital jitter susceptibility

Digital-to-analogue jitter susceptibility

Digital-to-digital jitter susceptibility

Note that only one of the above appears in the menu, dependent on the I/O domains selected in the

EUT I/O Setup.