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| Dorrough 240-A2 & 340-A2 Surround Sound Meters (Rack Only) |
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Dorrough 240-A2 & 340-A2 Surround Sound Meters (Rack Only)
The Model 240-A and 340-A are single channel straight line loudness meters ideal for applications where serveral meters are required, such as Surround Sound. The Model 240-A is designed for horizontal mounting, while the model 340-A is designed for vertical mounting.
These meters are ideal for HDTV 5.1 and 7.1 Surround Sound applications. Two custom mounting solutions tailored to this application are offered as options. The first choice is a metal rack adapter 5RU high, which accommodates 5 vertical (340-A) meters and a single horizontal (240-A) meter used for the .1 (LFE) channel at the bottom (shown below).
Specifications
For Models 40-A, 10-A, 20-A, 12-A, 240-A, 280-A, 380-A, 400-A.
Input Parameters
Input Z : 20k Ohm balanced, 10k Ohm single-ended, +/- 2%
CMRR : 80 dB at 60 Hz, 60 dB at 20 kHz (balanced mode)Input Sensitivity : -10 dB for full-scale displayMaximum Input Level : +24 dB before clipping
Signal Path Parameters
Signal Path Bandwidth : 10 Hz - 25 kHz, +/- .25 dBSignal Path Distortion : Less than 1% THD at 1 kHz, +24 dB inputSum Error : Less than 0.1 dB at 1 kHzDifference Error : Less than 0.1 dB at 1 kHz
Display Parameters (All parameters apply to AVERAGE, PEAK, and PEAK HOLD display elements.)
Display Resolution : 40 LEDs, 1 dB/LED except model 60D, +/- 0.25 dB.Step Size Error : +/- 0.25 dBAbsolute Error :
- Full Scale -39 dBu : +/- 0.25 dB model A,B,C
- Full Scale -59 dBu : +/- 0.25 dB model D
Drift : +/- 0.25 dBAverage Time Constant : 600 mS, +/- 6%Peak Acquistion Period : 10 uS, to full-scale, sine input 25kHzPeak Attack Period : Virtually InstantaneousPeak Decay Period : 180 mS, from full-scale to all LEDs off (models A, B, C)Display Update Rate : Approximately 10 mSDisplay Duty Cycle : Display Time, AVERAGE, PEAK HOLD - 75%
Display Time, PEAK - 100%
Miscellaneous Parameters
Power Supply Input Range : 117/237 VAC RMS, -20% to +10%, 50-60 HzCalibration Controls : None neededUser 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)
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