Dorrough 20-C Analog Loudness Meter +20dB

BH #DO20C • MFR #20-C
Dorrough
Dorrough 20-C Analog Loudness Meter +20dB
Special Order
Expected availability: 7-14 business days
$449.95

Important Notice

  • This item is noncancelable and nonreturnable.

Dorrough 20-C Analog Loudness Meter +20dB

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Dorrough 20-C Overview

  • 1Description
  • 2Straight Line Display
  • 3Peak and Average Percent Metering
  • 4Right and Left Inputs for Stereo Mixing

The Dorrough 20-C Analog Loudness Meter is a single-channel version of Dorrough's standard 40 series loudness meter with a straight-line scale designed for applications with limited vertical space and display calibrated to +20dB.

This meter provides access phase correlation, peak hold, sum/diff, and reference mode allowing 0 reference setting to .1dB accuracy, directly or with the optional remote control. It has Phoenix (euroblock) connectors. Rack mounting is required.

Straight Line Display

The 20 Series is functionally identical to the 40 series, except that the 20s have a straight-line scale designed for applications with limited vertical space. These easy-to-read meters are made to install easily in a custom console or with optional rack mounts.

Peak and Average Percent Metering

The 20-C, like all Dorrough loudness meters, simultaneously displays peak and average, in this model with a straight-line scale designed for applications with limited vertical space and calibrated to +20dB. 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.

Dorrough 20-C Specs

Input Impedance20k Ohm balanced, 10k Ohm single-ended, +/- 2%
Common Mode Rejection Ratio80 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 Bandwidth10 Hz - 25 kHz, +/- .25 dB
Signal Path DistortionLess than 1% THD at 1 kHz, +24 dB input
Sum ErrorLess than 0.1 dB at 1 kHz
Difference ErrorLess than 0.1 dB at 1 kHz
Display Resolution40 LEDs, 1 dB/LED except model 60D, +/- 0.25 dB.
Step Size Error+/- 0.25 dB
Absolute ErrorFull Scale -39 dBu: +/- 0.25 dB model
Drift+/- 0.25 dB
Average Time Constant600 mS, +/- 6%
Peak Acquisition Period10 uS, to full-scale, sine input 25kHz
Peak Attack PeriodVirtually Instantaneous
Peak Decay Period180 mS, from full-scale to all LEDs off
Display Update RateApproximately 10 mS
Display Duty CycleDisplay Time, AVERAGE, PEAK HOLD - 75%; Display Time, PEAK - 100%
Power Supply Input Range117/237 VAC RMS, -20% to +10%, 50-60 Hz
Calibration ControlsNone needed
User ControlsLeft/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 PortDB-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 3.0 x 1.75" (in.) (3.3 x 1.2 x 0.7cm)
WeightNot Specified by Manufacturer
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