Dorrough Stereo/Mono Balance Meter

Dorrough 40-P Stereo/Mono Balance Meter

Dorrough 40-P Stereo/Mono Balance Meter

B&H # DO40P MFR # 40P
Dorrough Stereo/Mono Balance Meter

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Important Notice: This item is non-cancelable and non-returnable
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  • 1Description

The Dorrough 40-P Stereo/Mono Balance Meter accepts either mono or stereo signals and displays a readout beginning at the center. Left channel level is indicated by a continuous row af LEDs fanning out to the left from center. Right channel level is indicated by a continuous row of LEDs directed out to the right from center.

When in Balanced Discrete Mode, the difference between the two sides presents a relative visual balance reference in amplitude. When in Balanced Center Point Mode, perfect parity is achieved when the two center green LEDs go dark (null mode). A jack is provided with a switch for selection between the two modes of operation.

Mono and Stereo Signal Meter
The Model 40-P Balance Meter provides convenient display of both mono and stereo signal parity as two indications starting at center scale, with signal amplitudes extending out from either side of center. Any imbalance between the two signals is displayed at a glance.
Discrete Balance
LEFT/RIGHT average is displayed as discrete left/right bars from center. This mode is activated at center "off" toggle-switch (supplied) position
Center Balance
A mathematical derivation of average center point between LEFT/RIGHT is displayed as a bar from "null" center point. Simultaneously, the crest of both left and right average is displayed as discrete segments (LEDs), one segment to the left of "null center" and one to the right. This mode is activated by switching toggle-switch to top and bottom "on" positions.
In the Box
Dorrough 40-P Stereo/Mono Balance Meter
  • 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 Not Applicable
    Peak Decay Period Not Applicable
    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) 8.5 x 6.5 x 2.8" (in) (3.3 x 2.6 x 1.1cm)
    Weight Not Specified by Manufacturer

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