Dorrough 21C Vertical Analog Loudness Meter +20 dB

Dorrough 21C Vertical Analog Loudness Meter +20 dB

Dorrough 21C Vertical Analog Loudness Meter +20 dB

B&H # DO21C MFR # 21-C
Dorrough 21C Vertical Analog Loudness Meter +20 dB

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  • 1Description

The Dorrough 21C Vertical Analog Loudness Meter +20 dB is a single-channel version of Dorrough's standard 40 series loudness meter with a straight-line scale display scale allowing 20 dB of headroom in 1 dB steps. The headroom scale is identical to the AES/EBU Digital Standard.

This meter provides access phase correlation, peak hold, sum/diff, and reference mode allowing 0 reference setting to 0.1 dB accuracy, directly or with the optional remote control. It has Phoenix (euroblock) connectors. Rack mounting is required.

Peak and Average Level Metering
The 21C, like all Dorrough loudness meters, simultaneously displays peak and average, in this model down to +20 dB. The relative difference, in dB, between Peak and Average ballistics is derived from the integration time of the persistence scale.
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 that can cause 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 21C Vertical Analog Loudness Meter +20 dB
  • 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, +/- 0.25 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 40 LEDs, 1 dB/LED except model 60D, +/- 0.25 dB
    Step Size Error +/- 0.25 dB
    Absolute Error Full Scale -39 dBu: +/- 0.25 dB model
    Drift +/- 0.25 dB
    Average Time Constant 600 mS, +/- 6%
    Peak Acquisition Period 10 uS, to full-scale, sine input 25 kHz
    Peak Attack Period Virtually Instantaneous
    Peak Decay Period 180 mS, from full-scale to all LEDs off
    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) 2.8 x 8.5 x 6.5" (7.11 x 21.59 x 16.51 cm)
    Weight Not Specified by Manufacturer

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