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Dorrough 40-C Dual rack

Discussion in 'Metering VU' started by audiokid, Oct 25, 2011.

  1. audiokid

    audiokid Staff

    2259_full.jpg

    The 40-C has a scale allowing for 20dB of headroom in 1dB steps. The headroom scale is identical to the AES/EBU Digital Standard.

    The 40-A series Loudness Meters are considered the standard models with built-in power supplies. They are the large ARC-Style, three color LED display single channel meters.

    The Remote Control (RW-100) is now available for these units and will access the functions of phase correlation display, peak hold, sum/diff, and activate a reference mode allowing for accurate 0 setting within .1dB. A red LED notification alarm is present on the front of the unit.

    Specifications

    For Models 40-A, 10-A, 20-A, 12-A, 240-A, 280-A, 380-A, 400-A.

    Input Parameters
    Input Z : 20k Ohm balanced, 10k Ohm single-ended, +/- 2%
    [TABLE]
    [TR]
    [TD]
    • CMRR : 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 Parameters

    • 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 Parameters (All parameters apply to AVERAGE, PEAK, and PEAK HOLD display elements.)

    • 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 A,B,C
    - Full Scale -59 dBu : +/- 0.25 dB model D

    • Drift : +/- 0.25 dB
    • Average Time Constant : 600 mS, +/- 6%
    • Peak Acquistion 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%

    Miscellaneous Parameters


    • 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)[/TD]
    [/TR]
    [/TABLE]
     

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