Have a Question? Contact Us

888-462-7828 Live Chat

Dolby LM100NTSC Broadcast Loudness Meter - B-Stock

  • Dale #:

  • Availability:

    In Stock
  • Available for immediate shipment or pick-up from our Jamaica, NY warehouse. In-store pick-up is available Monday through Friday 8:30 am to 5:30 pm.

Condition: B-Stock
This item was returned to us in excellent condition.
Power cable, computer cable, rack screws and manual are included. Ships in the original packaging.


The Dolby Broadcast Loudness Meter LM100 is a tool that provides objective, accurate measurements of the subjective loudness of dialogue within broadcast programming. Differences in audio levels between programs, or between programs and commercials, are a major annoyance to TV viewers. However, t... Read More

Shipping Charges Apply

Have a Question?

Call Toll Free: 888-462-7828 Live Chat Email Us

Suggested Accessories


The Dolby Broadcast Loudness Meter LM100 is a tool that provides objective, accurate measurements of the subjective loudness of dialogue within broadcast programming. Differences in audio levels between programs, or between programs and commercials, are a major annoyance to TV viewers. However, these differences have proven difficult for broadcasters to measure with conventional methods and equipment. The Dolby® Broadcast Loudness Meter LM100 solves that problem through Dialogue Intelligence™, a revolutionary technology developed specifically to measure the perceived loudness of dialogue.

Research shows that most viewers adjust TV volume to normalize dialogue levels. By analyzing the input signal and measuring program loudness only during the presence of speech, Dialogue Intelligence objectively measures what viewers subjectively experience.

Applications for the Dolby LM100 range from postproduction and quality control to final transmission, program turnaround, and cable headend facilities.

Measures Using International Standards
The Dolby LM100 loudness meter can use ITU-R BS.1770-1 and BS.1770-2 as the core measurement algorithm. Users can also select Leq(A) or EBU R128.* The LM100 can also determine the unweighted peak and a range of other information about the signal, including the Loudness Range measurement specified by the EBU.

Easy-to-Read Measurements
The Dolby LM100 presents its measurements in an easy-to-understand numerical format. This eliminates the variations in results that multiple operators often find when using VU or PPM meters, neither of which was designed to measure subjective loudness. The unit can simultaneously display the incoming dialogue normalization (dialnorm) value of a Dolby Digital program (or any program within a Dolby E bitstream) for direct comparison to the actual measured value.

Complete User Notifications
A set of user-definable alarms and monitoring functions can inform an operator of input loss, signal clipping, overmodulation (LM100-NTSC version), high or low signal levels, silence, and incorrectly set dialnorm values.

Remote Control Capability
Front- and rear-panel serial interfaces provide capabilities for software updates and the Dolby LM100 software remote application. The remote application will assist users with advanced loudness measurement, logging features, and enhanced error reporting.

Two Configurations
The LM100-LTC includes a timecode input, which allows alarm and other signal conditions to be logged to either the internal time-of-day clock or external timecode. The LM100-NTSC includes an RF input specifically for NTSC CATV and "off-air" television measurement applications. Because the RF tuner replaces the linear timecode input in this version, logging is referenced to the internal clock.

More +

Product Specs

Core Measurement Algorithm (User Selectable) EBU R128
ITU-R BS.1770-2
ITU-R BS.1770-1
Dialogue Intelligence Algorithm Proprietary; patent pending
Audio Sampling Rates 32, 44.1, and 48 kHz
Measurement/Analysis System Log 480 events stored in internal nonvolatile RAM
Unlimited event storage and retrieval with use of LM100 software remote application on a PC
Power Requirements 90–264 VAC, 50–60 Hz, autosensing, 15 W maximum; designed to operate from a centrally switched power source
Dimensions and Weight 1-U rackmount: 44 × 483 × 375 mm (1.75 × 19 × 14.75 inches)
Net: 2.5 kg (5.5 lb)
Environmental Conditions Operating: 0°C–50°C (32°F–122°F), natural convection cooling, 0%–98% relative humidity (noncondensing)
Nonoperating: –20°C to +70°C (–4°F to 158°F)
Front Panel Specifications  
Display and Controls Intuitive, easy-to-read user interface; input source selection determines display parameters
Keypad Enables local control of setup functions and status display
Alarm LEDs Audio alarm, fault, and error
Headphone Output 6.35 mm (1/4-in.) standard stereo headphone jack, level-adjustable for confidence monitoring
RS-232 Serial Remote Control Input Port 8-pin female mini-DIN connector for the LM100 software remote application and software upgrades
Rear Panel Specifications  
Digital Audio Input BNC female connector with loop-through, unbalanced, 75 , signal levels per AES-3ID-1995 (SMPTE 276M), external 75 termination required Formats supported: PCM data up to 24 bits; Dolby E data supported in 16-, 20-, and 24-bit modes at 48 kHz; Dolby Digital (AC-3) data at 32, 44.1, and 48 kHz sample rates
Analog Audio Inputs Two Neutrik® combination XLR/¼-inch TRS connectors, electronically balanced; maximum input level: ~ +22 dBu
Input impedance: 10 k ; user-definable nominal operating levels
Analog Audio Outputs Two RCA-type connectors, unbalanced, stereo; maximum output level: 2 Vrms into a 10 k load per IEC 61938
RF Input F-type female connector with internal 75 termination; tuner frequency range: 55.25–801.25 MHz; supports BTSC encoded stereo signals
Selectable CATV or "off-air" modes; CATV mode supports the Cable Television Channel Identification Plan per EIA 542 (user-selectable: Standard, HRC, or IRC); video output: composite, BNC female
RS-485 Serial Remote Control Input port 9-pin female D-connector for remote control and software upgrades
Alarm Port 9-pin female D-connector, 0–5 V TTL level; user-definable alarms: input clip detection, modulation overload, loudness above threshold, loudness below threshold (silence), dialnorm threshold, and AES input loss
General Purpose Input/Output Port 9-pin female D-connector, 0–5 V TTL level
Functions include: measurement pause, measurement reset, input source select, channel up/down (LM100-NTSC only), measurement state

More +

Shipping Rate Calculator


Also Popular