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Dorrough 40-C - Analog Loudness Meter w/C Scale

BH #DO40C • MFR #40-C
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Dorrough 40-C - Analog Loudness Meter w/C Scale
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Dorrough 40-C Overview

The Dorrough 40-C is a professional analog loudness meter, designed for modern stereo recording and broadcast requirements, and offering simultaneous average and peak program display, with separate ballistics and lightning-fast response. This meter is equipped with a 40-LED bar graph, allowing for 20dB of headroom in 1dB steps of resolution per LED.

Rack or console mounted Analog Loudness Meter with dual dedicated ballistics for simultaneous peak and average readout
Microchip processor with accuracy of oscilloscope, ultra-fast response time of 600ms average, virtually instantaneous peak for seamless continuous display of peak/average relationship
Individual left and right XLR inputs for stereo mixing applications, +4 dB factory-calibrated
Display with 40 LED's providing 1dB resolution per LED
Proprietary "C" scale with 20dB of headroom in 1dB steps, identical to AES/EBU digital standard
XLR, 6 DIP switches for function assignments, mini 8-pin DIN port out for access to alarm relays, meter mode functions, and peak hold modes, standard with unit

Dorrough 40-C Specs

Input Impedance
20 kOhm balanced
10 kOhm 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
>1% THD at 1 kHz, +24 dB input
Sum Error
>0.1 dB at 1 kHz
Difference Error
>0.1 dB at 1 kHz
Display Resolution
40 LEDs, 1 dB/LED
Step Size Error
+/- 0.25 dB
Absolute Error
+/- 0.25 dB (Full Scale -39 dBu)
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
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
8.5 x 6.5 x 2.8" (215.9 x 165.1 x 71.1mm)
Weight
2.3 lb (1.04 kg)
Packaging Info
Package Weight
3.08 lb
Box Dimensions (LxWxH)
11.6 x 8.8 x 5.6"

Dorrough 40-C Reviews

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