Dorrough 280-DE Digital Loudness Meter-Horizontal Mount

Dorrough 280-DE Digital Loudness Meter -57dB 32-96ks

Dorrough 280-DE Digital Loudness Meter -57dB 32-96ks

B&H # DO280DE MFR # 280-DE
Dorrough 280-DE Digital Loudness Meter-Horizontal Mount

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  • 1Description

The Dorrough 280-DE Digital Double Scale Loudness Meter -57dB 32-96k is a two channel digital loudness meter in AES/EBU linear style, designed for insertion directly into the digital data-stream. It has a dual-channel, horizontal linear display, with -57dB headroom, and an external power supply. This model is designed for console mounting, rackmounting, or custom installations. It is built with XLR, DIP switch assignments, and mini DIN pin out. A mating connector is supplied, prewired to the power pack, also supplied. Wired remote control option is also available.

Straight Line Display
The 280 Series is functionally identical to the 40 series, except the 280s have a straight line scale designed for applications with limited horizontal space. These easy to read meters are made to install easily to custom console or with optional rack mounts.
Dual Channel Meter
These meters are ideal for situations where many channels must be monitored in limited space, such as a mobile news-van or crowded control room. The close, side-by-side positioning of the two monitored channels facilitates critical comparisons.
Peak and Average Metering
The Dorrough 280 digital meters feature both peak and average level display simultaneously, over indication, and selectable peak hold. They conform to all AES 3 (1992) specifications, and are compatible to 96ks.
Right and Left Inputs for Stereo Mixing
With one instrument, the operator can easily see the stereo mix and avoid classic in-phase/out-of-phase problems as well as center channel buildup causing a mix to seem louder. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility.
In the Box
Dorrough 280-DE Digital Loudness Meter -57dB 32-96ks
  • Power Adapter
  • A Mating Connector, Prewired to the Power Pack
  • 2-Year Warranty
  • Table of Contents
    • 1Description
    Input Impedance 20k Ohm balanced, 10k Ohm single-ended, ± 2%
    Common Mode Rejection Ratio 80dB at 60Hz, 60dB at 20KHz (balanced mode)
    Input Sensitivity -10dB for full-scale display
    Maximum Input Level +24dB before clipping
    Signal Path Bandwidth 10Hz - 25KHz, ±.25dB
    Signal Path Distortion Less than 1% THD at 1KHz, +24dB input
    Sum Error Less than 0.1dB at 1KHz
    Difference Error Less than 0.1dB at 1KHz
    Display Resolution 40 LEDs, 1dB/LED except model 60D, ± 0.25dB.
    Step Size Error ±0.25dB
    Absolute Error Full Scale -39dBu: ±0.25dB model
    Drift ±0.25dB
    Average Time Constant 600mS, ±6%
    Peak Acquisition Period 10uS, to full-scale, sine input 25KHz
    Peak Attack Period Virtually Instantaneous
    Peak Decay Period 180mS, from full-scale to all LEDs off
    Display Update Rate Approximately 10mS
    Display Duty Cycle Display Time, AVERAGE, PEAK HOLD - 75%; Display Time, PEAK - 100%
    Power Supply Input Range 117/237VAC RMS, -20% to +10%, 50-60Hz
    Calibration Controls None needed
    User Controls Left/Right input sensitivity Option DIP Switch

    A) Peak Auto [ON]

    B) Difference Mode [ON/OFF]

    C) Over Level Alarm [ENABLE]

    D) Under Level Alarm [ENABLE]

    E) Auto ARMP

    User Port DB-9 Connector

    A) Alarm relay closure contacts 1 form C, 1A, 30V AC or DC

    B) Mode control switch (user supplied)

    C) PEAK function switch (user supplied)
    Dimensions (WxDxH) 5.0 x 7.0 x 1.5" (2.0 x 2.8 x 0.6cm)
    Weight Not specified by the manufacturer
    Packaging Info
    Package Weight 2.25 lb
    Box Dimensions (LxWxH) 22.0 x 10.5 x 4.5"

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