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The Dorrough 280D3 Digital Loudness Meter-39dB 32-96k -18 Rfrn is a two-channel digital-reading stereo loudness meter in AES/EBU linear style, designed for insertion directly into the digital data-stream. It has a dual-channel horizontal linear display with 39dB headroom, and an external power supply. The 280-D3 is referenced at -18dB for the EBU standard. Compatible formats 32, 44.1, 48, 96ks. 110 and 75 ohm inputs.
This model is designed for console mounting, rackmounting, or custom installations. It is built with XLR, DIP switch assignments, and mini DIN pin out. A mating connector prewired to the power pack is also supplied. A wired remote control option is also available.
Straight Line Display
The 280 Series is functionally identical to the 40 series, except that the 280s have a straight-line scale designed for applications with limited horizontal space. These easy-to-read meters are made to install easily in a custom console or in a rack with optional rack mounts.
Dual Channel Meter
These meters are ideal for situations where many channels must be monitored in limited space, such as a mobile news van or crowded control room. It has a dual-channel horizontal linear display with 39dB headroom, and an external power supply. The 280-D3 is referenced at -18dB for the EBU standard. Compatible formats 32, 44.1, 48, 96ks. 110 and 75 ohm inputs.
Peak and Average Metering
The Dorrough 280 digital meters feature both peak and average level display simultaneously, over indication, and selectable peak hold. They conform to all AES 3 (1992) specifications, and are compatible to 96ks.
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 causes a mix to seem louder. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility.
In the Box
Dorrough 280D3 Digital Loudness Meter-39dB 32-96K -18 Reference
A Mating Connector, Prewired to the Power Pack
Table of Contents
20k Ohm balanced, 10k Ohm single-ended, +/- 2%
Common Mode Rejection Ratio
80 dB at 60 Hz, 60 dB at 20 kHz (balanced mode)
-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
Less than 0.1 dB at 1 kHz
Less than 0.1 dB at 1 kHz
40 LEDs, 1 dB/LED except model 60D, +/- 0.25 dB.
Step Size Error
+/- 0.25 dB
Full Scale -39 dBu: +/- 0.25 dB model
+/- 0.25 dB
Average Time Constant
600 mS, +/- 6%
Peak Acquisition Period
10 uS, to full-scale, sine input 25kHz
Peak Attack Period
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
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
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)
5.0 x 7.0 x 1.5" (in.) (2.0 x 2.8 x 0.6cm)
Not Specified by Manufacturer
Dorrough Digital Loudness Meter-39dB 32-96k -18 Refrn Review