Dorrough Surround Sound Loudness Meter +20db

Dorrough 340-C Surround Sound Meter +20dB

Dorrough 340-C Surround Sound Meter +20dB

B&H # DO340C MFR # 340-C
Dorrough Surround Sound Loudness Meter +20db

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  • 1Description

The Dorrough 340-C Surround Sound Meter +20dB is a single-channel straight-line display loudness meter with 20dB headroom. It is used for applications where several meters are required and is ideal for HDTV 5.1 and 7.1 Surround Sound applications. The Model 240-A is designed for vertical mounting and is outfitted for XLR connections.

Actual Energy Display
Dorrough Loudness Meters display actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. This feature allows all program material to be adjusted for equal perceived loudness while protecting the peak of the waveform.
Peak and Average Level Metering
The 340C, like all Dorrough loudness meters, simultaneously displays peak and average. The relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale.
Right and Left In puts 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 that causes a mix to seem louder. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility.
Made for Surround Sound Applications
This single channel straight line loudness meter is ideal for applications where serveral meters are required, such as Surround Sound. They are particularly useful for HDTV 5.1 and 7.1.
In the Box
Dorrough 340-C Surround Sound Meter +20dB
  • 2-Year Warranty
  • Power Cord/Adapter
  • Table of Contents
    • 1Description
    Input Impedance 20k Ohm balanced, 10k Ohm single-ended, +/- 2%
    Common Mode Rejection Ratio 80 dB at 60 Hz, 60 dB at 20 kHz (balanced mode)
    Input Sensitivity -10 dB for full-scale display
    Maximum Input Level +24 dB before clipping
    Signal Path Bandwidth 10 Hz - 25 kHz, +/- .25 dB
    Signal Path Distortion Less than 1% THD at 1 kHz, +24 dB input
    Sum Error Less than 0.1 dB at 1 kHz
    Difference Error Less than 0.1 dB at 1 kHz
    Display Resolution Less than 0.1 dB at 1 kHz
    Step Size Error +/- 0.25 dB
    Absolute Error Full Scale -39 dBu: +/- 0.25 dB model A,B,C
    Drift +/- 0.25 dB
    Average Time Constant 600 mS, +/- 6%
    Peak Acquisition Period 10 uS, to full-scale, sine input 25kHz
    Peak Attack Period Virtually Instantaneous
    Peak Decay Period 180 mS, from full-scale to all LEDs off (models A, B, C)
    Display Update Rate Approximately 10 mS
    Display Duty Cycle Display Time, AVERAGE, PEAK HOLD - 75%

    Display Time, PEAK - 100%

    Power Supply Input Range 117/237 VAC RMS, -20% to +10%, 50-60 Hz
    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) 1.5 x 7.5 x 5.0" (in.) (.6 x 3.0 x 2.0cm)
    Weight Not Specified by Manufacturer

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