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Dorrough Electronics 280C(H)
Audio Meter, Analog Loudness, 20dB of Headroom, Horizontal

OUR PART #:  280C(H)

The Dorrough 280-C Analog Loudness Meter +20dB offers a dual-channel, horizontal linear display, with 20dB headroom, and an external power supply.
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Our Price: $846.19
List Price: $850.00
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Dorrough Electronics 280C(H)
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The Dorrough 280-C Analog Loudness Meter +20dB offers a dual-channel, horizontal linear display, with 20dB headroom, and an external power supply. This model is designed for console mounting, rackmounting, or custom installations. It is built with XLR, DIP switch assignments, and mini DIN pin out. The 280 series is made for situations where many channels must be monitored in limited space, such as a mobile news van or crowded control room. A wired remote control option is also available.


  • Straight Line Display
  • Dual Channel Meter
  • Peak and Average Metering
  • Right and Left Inputs for Stereo Mixing


  • 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: 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 25kHz
  • 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

    o   Left/Right input sensitivity Option DIP Switch

    o   Peak Auto [ON]

    o   Difference Mode [ON/OFF]

    o   Over Level Alarm [ENABLE]

    o   Under Level Alarm [ENABLE]

    o   Auto ARMP

  • User Port: DB-9 Connector

    o   Alarm relay closure contacts 1 form C, 1A, 30V AC or DC

    o   Mode control switch (user supplied)

    o   PEAK function switch (user supplied)

  • Dimensions (WxDxH): 5.0 x 7.0 x 1.5" (in.) (2.0 x 2.8 x 0.6cm)

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