User Manual for Dorrough 40-B - Horizontal Rackmount Analog Loudness Meter with "B" Scale Click to enlarge the picture
Contents of the user manual for the Dorrough 40-B - Horizontal Rackmount Analog
- Product category: Metering Dorrough
- Brand: Dorrough
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Dorrough Metering
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User manual for the Dorrough 40-B - Horizontal Rackmount Analog contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Dorrough product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Dorrough user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Dorrough product will considerably shorten its lifespan!
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Product description The Dorrough 40-B 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. The 40-B is equipped with a 40-LED bar graph, showing 1dB of resolution per LED, with a scale ranging from -36 to +3dB, measuring percent of modulation, providing very reliable peak protection at transmission sites. - 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 "B" scale calibtared in percent modulation, from -36 to +3dB, providing accurate peak protection at transmission sites
- 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
In the Box Dorrough 40-B - Horizontal Rackmount Analog Loudness Meter with "B" Scale Owner's Manual 1 Year Warranty Table of Contents
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Technical parametersDorrough 40-B 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 (WxDxH) | 8.5 x 6.5 x 2.8" (215.9 x 165.1 x 71.1mm) | | Weight | 2.3 lb (1.04 kg) | | | | Package Weight | 2.75 lb | | Box Dimensions (LxWxH) | 12.4 x 9.3 x 6.9" |
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