Videotek VTM-2000 Specifications download pdf (Page 29)

Operation

VTM-200 Installation and Operation Handbook 3-13

Audio Ballistics

The audio display is an option. The audio levels are represented by bar graph level

meters with characteristics selectable to be either IEC Type I, IEC Type IIa, IEC Type

IIb, Type I +8, or Nordic for both analog and digital inputs; for digital inputs only, the

dBfs scale is selectable. The IEC types are according to IEC-268-10 and -17

specifications. The graticules are calibrated in dB, and the selected reference level,

(either 0, +4, +6, +8, or +12 dBm for analog audio inputs, or -22, -20, or -18 dBfs for

digital audio inputs) corresponding to the 0 mark is listed, along with the audio source.

In addition to the L1, R1, L2, and R2 level scales, there are φ1 and φ2 phase

difference scales. φ1 measures the instantaneous phase difference between the

signals applied to the L1 and R1 scales. φ2 measures the instantaneous phase

difference between the signals applied to the L2 and R2 scales. The φ scales are

calibrated in +1 (0°), 0 (90°), and -1 (180°) markings. The region between +1 and 0 is

green; the region between 0 and -1 is red; a yellow indicator mark shows the phase

difference.

The audio scales and ballistics both attack and delay times for meter movement. The

following meter responses can be selected:

• NORMAL

• PEAK

• PEAK HOLD

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 71 72

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Videotek VTM-2000 Specifications Page 29