LLM-1770

Loudness Loggers

The Videotek® LLM-1770 loudness logger and monitor is a compact audio monitoring tool that makes it easy to confirm compliance with the latest loudness requirements. Loudness and true peak measurements are made to the ITU-R BS.1770 standard with five times oversampling.

Settings are included that match the EBU R 128 and ATSC A/85 recommendations. Internal memory stores five days of loudness and alarm data. Logs can be exported via Ethernet or USB. Remote control and monitoring can be performed from any Web browser.

The LLM-1770 comes with four AES inputs and has an option for SDI embedded from SD, HD or 3 Gb/s sources. There is a headphone jack for local confidence monitoring.

Features

Loudness measurement to ITU-R BS.1770
True peak measurement to ITU-R BS.1770 with five times oversampling
Configurations for EBU R-128 and ATSC A/85
Internal data storage for five days of loudness and alarms
Export values to a PC via Ethernet or USB
Front panel display of critical values
Simultaneous monitoring of surround and stereo
Alarms for levels, loudness and timecode
Four AES inputs
Optional SDI input
Headphone output
LTC input for time stamps
Remote control and monitoring via Web browser

Images/Diagrams

Back Panel

Specifications

Specifications and designs are subject to change without notice.

Digital Audio Input
Audio Formats	AES, embedded audio (optional)
AES Input Connector Type	4 BNC female
AES Input Impedance	75 ohms nominal
AES Input Return Loss	≥25 dB, 0.1 to 6 MHz (unbalanced)
AES Input Level	0.2 to 2 V
AES Input Sample Rate	32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz Note: audio inputs are sample rate converted to 48 kHz
Meter Accuracy Over Frequency	±0.1 dB from 20 Hz to 19 kHz with 0 to -40 dBFS sine wave input, except for within 7 Hz of some submultiples of the 240 kHz oversampling frequency

3G-SDI Input
Input Type	1 active looping input
Input Connector Type	BNC female
Input Impedance	75 ohms nominal
Signal Source Amplitude	800 mV nominal
Signal Source DC Offset	±0.5 V
Input Return Loss	≤-10 dB, 1.485 to 2.97 GHz
Cable EQ	≥80 m, Belden 1694A

HD-SDI Input
Input Type	1 active looping input
Input Connector Type	BNC female
Input Impedance	75 ohms nominal
Signal Source Amplitude	800 mV nominal
Signal Source DC Offset	±0.5 V
Input Return Loss	≤-15 dB, 270 MHz to 1.485 GHz
Cable EQ	≥100 m, Belden 8281

SD-SDI Input
Input Type	1 active looping input
Input Connector Type	BNC female
Input Impedance	75 ohms nominal
Signal Source Amplitude	800 mV nominal
Signal Source DC Offset	±0.5 V
Input Return Loss	≤-25 dB, 5 to 270 MHz
Cable EQ	≥300 m, Belden 8281

3G/HD/SD-SDI Output
Output Impedance	75 ohms
Output Return Loss	≤-15 dB, 5 MHz to 1.485 GHz
Output Return Loss	≤-10 dB, 1.485 to 3 GHz
Output Signal Level	800 mV ±10%
Output DC Offset	0 V ±0.5 V

Analog Monitoring Output (Headphone)
Number/Connector	1 stereo output, 1x 1/8 in. (3.5 mm) headphone jack
Load Impedance	16 ohms nominal
Maximum Output Level	44 mW RMS
Total Harmonic Distortion + Noise (THD+N)	≤-65 dB

Control
GPI	4 total user-configured
GPO	1 alarm, user-configured
Connector	15-pin HD (high-density) D-Sub, female
Input Impedance	10 k ohms returned to +3.3 VDC
Alarm Output	Relay closure
Maximum Relay Current	100 mA @ 50 VDC
Peripheral Interface	USB 2.0 supporting storage devices, and keyboard
Connector	USB 2.0, Type A, female

Timecode
Input	LTC via back-panel connector

Communication Interfaces
Ethernet	1 Ethernet port RJ45 10/100Base-T connector
USB	1 USB 2.0 host port
LTC/GPIO	1 LTC/GPIO connector 15-pin female D-Sub

Ethernet
Standard	10/100Base-T conforms to IEEE802.3
Connector	RJ45

Power Requirements
Power Connector	15 VDC nominal, 11 VDC minimum, 17 VDC maximum
Power Consumption	25 W nominal
Over-Voltage Protection	±50 VDC nominal

Mechanical
Dimensions (H x W x D)	5.22 x 8.46 x 5.8 in. (13.26 x 21.49 x 14. 73 cm)
Weight	5 lbs (2.27 kg)

Environmental
Operating Temperature	32° to 122° F (0° to 50° C)
Storage temperature	-22° to 149° F (-30° to 65° C)
Humidity (non condensing)	Operating: 20% to 80% Non-operating: 5% to 90%
Transportation	24 in. (9.5 cm) impact drop survivable in original factory packaging
Altitude (Operating)	6562 ft (2000 m)
Pollution Degree	2

Standard Accessories
Standard Accessories	Installation and operation handbook on CD Breakout connector for LTC/GPI 1 power cord 1 power supply assembly

Ordering Information

LLM-1770	Loudness logger and monitor with 4 AES inputs, headphone output

LLM-OPT-SDI	SD-SDI input option for the LLM-1770; adds embedded audio from SD, HD or 3 Gb/s SDI sources

LLM-OPT-SDI-F	SD-SDI input option for the LLM-1770; adds embedded audio from SD, HD or 3 Gb/s SDI sources, field upgrade

DRT-4A	Dual rackmount adapter; mount 1 or 2 LLM-1770, CMN-41, CMN-MV in a 19 in. (48.2 cm) equipment rack, 1RU high

BLK-5	Blank panel for unused side of a DRT-4

PTC-4	Desktop case with tilt bail

Have a question? We’re here to help.

North America +1 800 231 9673
Caribbean and Latin America +1 786 437 1960

Europe and Africa +44 118 964 8200
Middle East and South Asia +971 4 433 8250

Asia, Pacific Rim +852 2776 0628

Data Sheet

LLM-1770