Sound-devices 302 User Manual download pdf (Page 16)

302 User Guide and Technical Information

v. 3.6 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.

The Meter

The 302’s meter provides a great deal of audio signal information to the operator. The ability to

view multiple ballistics, peak levels (PPM), average levels (VU), or a combination of both, is unique

to Sound Devices LED-based meters. The 302 meters do not share the inherent limitations of LCD

and mechanical meters. LCD-based meters can have sluggish indications in cold temperature.

Mechanical meters can be fragile and not ideal for ﬁeld use.

The 302 meters share the same technology and software programmability used in Sound Devices

larger 442 ﬁeld mixers and on the 7-Series digital recorders.

Source

The meter can display levels of the output buses, the PFL levels, or RTN Input levels. Default

operation is always the output bus except when PFL’s are selected from the Headphone Selection

Switch. This operation can be modiﬁed in the Setup Menu.

Press to cycle through available

meter ballistics selections

Press to change

LED brightness

Scale

When viewing peak information on the meter, its scale is calibrated in peak-reading dBu. When

viewing VU (Volume Units) information, its scale corresponds to VU units.

Unlike other analog mixers, the 302 is calibrated with its 0 VU reference at 0 dBu, not +4 dBu. If you

primarily interconnect with analog video cameras, you may want to change the 0 VU reference to +4 dBu

in the Setup Menu.

The 302’s scale is designed for digital recording devices, providing maximum information between

-30 dBu to 0 dBu which is where typical peaks occur (-50 to -20 dBFS). This allows the user to record

with a full 12 to 20 dB of headroom while in the ﬁne-resolution green-colored part of the meter.

Additionally, the meter color changes to orange at 0 dBu and red at +8 dBu. These color changes

correspond to -20 dBFS and -12 dBFS respectively, which are commonly used recording levels for

today’s digital recording devices.

IRT Scale Compliance

The 302 meter scale can be shifted to comply with the German IRT speciﬁcations. Setup Menu item

-8 controls the adjustment to shift the meter scale. See http://www.irt.de/ for more information.

Ballistics

Meter Ballistics refers to way the LED Meter visually displays the behavior of an audio signal.

Pressing the PK/VU button on the 302’s front pane will instantly display the next ballistic setting. At

Factory Default, the ballistics are displayed in this order VU, Peak, Peak-Hold and VU combination,

and Peak and VU combination. The selection and order of the various ballistics can be altered in the

Setup Menu. See Setup Menu for more details.

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Sound-devices 302 User Manual Page 16