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Dorrough 40-A (Racked Pair)



The 40-A has a scale showing 14 dB headroom in 1dB steps from 14 to -25.

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%
  • 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)

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