User Manual for Dorrough 12-B Loudness Meter w Percent Modulation Click to enlarge the picture
Contents of the user manual for the Dorrough 12-B Loudness Meter w Percent
- 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 12-B Loudness Meter w Percent 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 12-B Analog Loudness Meter with Percent Modulation is a dual version of the single-channel Dorrough 10-B loudness monitor that measures Relative Loudness to Peak Modulation. The meters are calibrated in percent modulation, referenced at 100%. They have a lower scale in dB from -36 to +3dB, for accurate peak protection at transmission sites. The mechanism 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. Rack mounting is required. - Actual Energy Display
- Dorrough Loudness Meters display actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal, with this model expressed as a percent. These features allow all program material to be adjusted for equally perceived loudness while protecting the peak of the waveform.
- Dual Meters
- With these easy-to-read monitors you can view two channels or projects simultaneously, side-by-side. They are made to install easily to custom console or with optional rack mounts. Dorrough rack adapters for the model 12-A are available with cutouts for either single or double meters. Both are 2RU high and 19" wide.
- Peak and Average Level Metering
- The 12-B, like all Dorrough loudness meters, simultaneously displays peak and average, but measures relative loudness to peak. The relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale.
- Right and Left In puts 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 12-B Loudness Meter w/Percent Modulation 2-Year Warranty Table of Contents
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Technical parametersDorrough 12-B Specs | Input Impedance | 20k Ohm balanced, 10k Ohm 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 | Less than 1% THD at 1 kHz, +24 dB input | | Sum Error | Less than 0.1 dB at 1 kHz | | Difference Error | Less than 0.1 dB at 1 kHz | | Display Resolution | Less than 0.1 dB at 1 kHz | | Step Size Error | +/- 0.25 dB | | Absolute Error | Full Scale -39 dBu: +/- 0.25 dB model A,B,C | | 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 (models A, B, C) | | 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 | Each Meter: 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 | Each Meter: 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) | 8.6 x 3.0 x 2.0" (in.) (3.4 x 1.2 x .8cm) | | Weight | Not Specified by Manufacturer |
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