Dorrough Loudness Meter w/Percent Modulation

Dorrough 12-B Loudness Meter w/Percent Modulation

Dorrough 12-B Loudness Meter w/Percent Modulation

B&H # DO12B MFR # 12-B
Dorrough Loudness Meter w/Percent Modulation

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  • 1Description

The Dorrough 12-B Analog Loudness Meter with Percent Modulation is a dual version of the single-channel Dorrough 10-B loudness monitor that measures Relative Loudness to Peak Modulation. The meters are calibrated in percent modulation, referenced at 100%. They have a lower scale in dB from -36 to +3dB, for accurate peak protection at transmission sites.

The mechanism provides access phase correlation, peak hold, sum/diff, and reference mode allowing 0 reference setting to .1dB accuracy, directly or with the optional remote control. Rack mounting is required.

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, with this model expressed as a percent. These features allow all program material to be adjusted for equally perceived loudness while protecting the peak of the waveform.
Dual Meters
With these easy-to-read monitors you can view two channels or projects simultaneously, side-by-side. They are made to install easily to custom console or with optional rack mounts. Dorrough rack adapters for the model 12-A are available with cutouts for either single or double meters. Both are 2RU high and 19" wide.
Peak and Average Level Metering
The 12-B, like all Dorrough loudness meters, simultaneously displays peak and average, but measures relative loudness to peak. 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.
In the Box
Dorrough 12-B Loudness Meter w/Percent Modulation
  • 2-Year Warranty
  • 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 Each Meter:

    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 Each Meter:

    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) 8.6 x 3.0 x 2.0" (in.) (3.4 x 1.2 x .8cm)
    Weight Not Specified by Manufacturer
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