ESTEC LM 128P Manual de usuario

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272

www.ssb-audio.com * info@ssb-audio.com

Firmware Version P4.0x

Installation

Operation

www.ssb-audio.com

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

Content

1 Safety guidelines – read before using! .................................................................... 3

2 Properties ........................................................................................................... 4

2.1 Inputs .......................................................................................................... 4

2.2 Display ........................................................................................................ 4

2.2.1 LU Display Mode ..................................................................................... 4

2.2.2 PPM Display Mode ................................................................................... 4

2.2.3 Common in both Display Modes ................................................................ 4

2.3 Keys ............................................................................................................ 5

3 Technical Data ..................................................................................................... 5

4 Connections ........................................................................................................ 5

4.1 Power Supply ................................................................................................ 5

4.2 Digital Audio Inputs ....................................................................................... 5

4.2.1 AES Input .............................................................................................. 5

4.2.2 3G-SDI Input/Output (optional) ................................................................ 6

4.2.3 Sample Rates ......................................................................................... 6

4.3 Analog Inputs (optional) ................................................................................ 6

4.4 Remote Control ............................................................................................. 6

4.4.1 Connection ............................................................................................. 6

4.4.2 Function ................................................................................................. 6

4.5 USB Connector .............................................................................................. 6

5 Operation ........................................................................................................... 6

5.1 LED Bars ...................................................................................................... 6

5.1.1 LM Display Mode ..................................................................................... 7

5.1.2 PPM Display Mode ................................................................................... 7

5.2 Correlation Display ........................................................................................ 7

5.2.1 Missing Audio Signal Indication ................................................................. 7

5.3 Numerical 7-Segment Display ......................................................................... 7

5.3.1 Switching the Numerical Display On or Off ................................................. 7

5.3.2 Clip Indication ........................................................................................ 8

5.4 Input Selection AES, SDI and Analog ............................................................... 8

5.5 Start, Stop, Pause INT and LRA ....................................................................... 8

5.6 Display Options ............................................................................................. 8

5.7 Reference Level Settings and Clip Indication Time ........................................... 10

5.7.1 LU Reference Level ................................................................................ 10

5.7.2 ADC Full-Scale dBu-Level ....................................................................... 10

5.7.3 PPM Reference Level .............................................................................. 10

5.7.4 Clip Indication Time ............................................................................... 10

5.8 More Displays ............................................................................................. 11

5.8.1 Version Number .................................................................................... 11

5.8.2 Sample Rate ......................................................................................... 11

5.9 Factory Defaults .......................................................................................... 11

5.9.1 Factory Defaults for Loudness Meter (LM) ................................................. 11

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

5.9.2 Factory Defaults for Peak Program Meter (PPM) ........................................ 12

6 Control Functions Overview ................................................................................. 12

6.1 Short Keystroke .......................................................................................... 12

6.2 Long Keystroke ........................................................................................... 12

6.3 Settings ..................................................................................................... 13

6.3.1 Inputs.................................................................................................. 13

6.3.2 Color Scheme ....................................................................................... 13

6.3.3 Brightness ............................................................................................ 13

6.3.4 LED bar Yellow Tint (G◄─►R) ................................................................. 13

6.4 Reference Level Settings and Clip Indication Time ........................................... 14

6.4.1 LU Reference Level ................................................................................ 14

6.4.2 ADC Full-Scale dBu-Level (if analog inputs are available) ........................... 14

6.4.3 Clip Indication Time ............................................................................... 14

7 USB Functions ................................................................................................... 15

8 Appendix .......................................................................................................... 16

1 Safety guidelines – read before using!

The device meets protection class 2 and has left the factory in a technically faultless state.

In order to assure this state and to insure riskless operation the user must obey the notes and warnings which are

part of this manual.

Safety, reliability and performance of this device are guaranteed only when:

 Installation, expansions, modifications and repairs are accomplished only by the manufacturer or by personal

authorized by the manufacturer.

 The electrical installations of the relevant room meet the corresponding IEC (ANSI) requirements.

 The device is used in accordance with this user manual.

Power supply

The device is designed for continuous operation. The power supply’s operating voltage must meet the local line

voltage.

Avoid connections to the power supply system in junction boxes together with many other devices. The electrical

outlet needs to be installed close to the device and easily accessible.

Use the supplied power supply unit. Other power supplies may cause malfunctions or even damage the device.

Installation site

The device should stand only on clean horizontal work surfaces or be installed in a suitable rack. During operation

the device must not be exposed to vibration. Humidity, liquids of all kinds and dust must be kept away as far as

possible. Sufficient ventilation needs to be provided. Avoid direct sunshine and the proximity of radiators and

radiant heaters.

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

2 Properties

The Estec LM 128P is a Loudness and PPM Meter according to the EBU-recommendation R 128. It fulfills the

demands for the ‘EBU Mode’ corresponding to the specifications

 EBU R 128 (September 2011),

 ITU-R BS.1770-2 (March 2011),

 EBU Tech Doc 3341 (August 2011)

 EBU Tech Doc 3342 (August 2011) and

 DIN IEC 60268-10

For more information please refer to http://tech.ebu.ch/loudness .

Note: The LM 128P does not incorporate a true peak meter according to EBU R 128.

2.1 Inputs

 1 AES/EBU digital input (XLR) for measurements of stereo signals

 Option: 3G-SDI input/output (BNC) carrying up to 4 stereo signals, each of which can be selected to be

measured

 Option: 2 analog inputs (2 x XLR, stereo)

2.2 Display

2.2.1 LU Display Mode

 Short Term Level (average value over 3000 ms) with tricolor LED

bar with 51 segments

 Momentary Loudness (average value over 400 ms) with tricolor LED

bar with 51 segments

2.2.2 PPM Display Mode

 2 tricolor LED bars with 51 segments displaying the left and the right channel’s PPM values

 Scale range from -50 dB to +6 dB, linear from -10 dB to +6 dB with 2 LEDs per dB

2.2.3 Common in both Display Modes

 Numerical display of Short Term Loudness, Integrated Loudness or Loudness Range by

a four-digit 7-segment display

 Numerical display of Momentary Loudness and Integrated Loudness selectable between

LU and LUFS

 3 LEDs +1, 0 and –1 to display L/R-correlation in 5 ranges

 Various options for individual display and operation settings

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

2.3 Keys

 Key +20dB: Adds 20 dB gain to the PPM display. Also: Selection between Loudness Meter (LM) Display

Mode and Peak Program Meter (PPM) Display Mode.

 Key LUFS: Selection between LU (relative to a reference level) and LUFS (absolute to full scale level).

Also: Selection between AES/EBU, SDI and analog inputs (if available).

 Keys STL, INT and LRA: Selection of the 7-segment display: Short Term Loudness,

Integrated Loudness or Loudness Range. Also: Setup functions.

 Keys RUN/PAUSE resp. RESET: Start, Stop resp. Pause as well as resetting the Integrated Loudness

and the Loudness Range measurement.

3 Technical Data

 1 AES/EBU input, XLR, transformer coupled, for stereo signal measurements

 Optional 3G-SDI input/output, 2 x BNC

 Optional balanced analog inputs, input impedance approx. 34 kOhm, reference level for 0 LUFS adjustable

from 0 dBu up to +24 dBu in steps of 1 dB

 15 sample rates (8 kS/s up to 96 kS/s) are recognized automatically

 Automatic filter coefficients adjustment for 1 kHz reference frequency

 Sliding 400 ms and 3000 ms measuring windows with 25 ms resolution (i. e., the update rate is 40 Hz and

the overlapping is 375 ms and 2975 ms resp.)

 PPM measurements with 10 ms/90% resp. 5 ms/80% attack and 1.5 s/-20 dB decay time

 Correlation Meter dynamic range > 130 dB

 5 V low voltage supply, max. 2 A

 Size (W x H x D): 190 mm x 40 mm x 140 mm

 Weight: 850 g without / 900 g with optional SDI and analog inputs

4 Connections

4.1 Power Supply

5 V DC: Please use the supplied power supply unit. Other power supplies may cause malfunctions or even damage

the device.

4.2 Digital Audio Inputs

4.2.1 AES Input

This is an AES/EBU resp. AES3 input. With a matching adapter also AES3id (BNC) or S/P-DIF (RCA) signals can be

applied.

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

4.2.2 3G-SDI Input/Output (optional)

The optional 3G-SDI input/output provides a 4 stereo channel audio de-embedder for data stream 1. These 4

stereo signal pairs can be selected to be measured. The green LED “LOCK” will be on when a valid SDI signal is

detected.

4.2.3 Sample Rates

The LM 128P operates with the following 15 sample rates where the filter coefficients are automatically chosen

correctly for 1 kHz reference frequency:

8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 64, 88.2 and 96 kHz

For all other sample rates the filter coefficients of the closest known frequencies are chosen.

4.3 Analog Inputs (optional)

An optional analog stereo input is available on two XLR jacks.

4.4 Remote Control

The LM 128P is equipped with a remote control input with a 3-pin TRS (Tip, Ring, Sleeve) jack. With external keys

it is possible to

- start, stop and reset the INT and LRA measurement,

- select between STL, INT and LRA for the numerical display and

- clear the clipping indication.

Attention: The plug needs to be plugged strongly as far as it will go into the jack!

4.4.1 Connection

Two keys switching to ground can be connected.

T (Tip): Start, stop and reset the INT and LRA measurement

R (Ring): Select between STL, INT and LRA for the numerical display and clear clipping indication

S (Sleeve): Ground

4.4.2 Function

A key at pin T operates identically to the RUN/PAUSE resp. RESET key at the LM 128P.

With a key at pin R the numerical display is cyclically switched between STL, INT and LRA. The blue

LEDs in the corresponding keys display the current selection.

Pressing the key at pin R for a longer time will clear the clipping indication.

4.5 USB Connector

The LM 128P is equipped with a USB connector in order to read out the measured loudness values and to control

the most important functions. Refer to Chapter 7 “USB Functions”.

5 Operation

5.1 LED Bars

Depending on the display mode the LED bars either show LM (Loudness Meter) values or PPM (Peak Program

Meter) values.

Selection between both modes is done by pressing the LM/PPM key a long time (longer than 800 ms). The

display mode is indicated by the yellow LED PPM above the key, beside the PPM scale.

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

5.1.1 LM Display Mode

After power-on in LM display mode the upper LED bar SHORT TERM LEVEL (STL) shows the input’s signal

average power integrated over the recent 3000 ms. The lower LED bar MOMENTARY LEVEL (MML) shows the

input’s signal average power integrated over the recent 400 ms.

The marker 0 LU refers to the target loudness level which

should be set to -23 LUFS in order to comply with the EBU R

128 ‘EBU Mode’ specifications. It can be adjusted. In case the LU reference level is not set to -23 LUFS the

LM 128P does not operate in the ‘EBU Mode’.

5.1.2 PPM Display Mode

In PPM display mode the LED bars display the measured PPM

values for the left resp. the right channel. The reference level

for the PPM display is -9 dBFS, i.e., with a digital signal of -9 dBFS a PPM value of 0 dB is displayed.

In the PPM display mode 20 dB gain can be added to the displayed PPM value so that signals down to

even -70 dB can be detected. The additional gain is selected by the key +20dB and indicated by the

illuminated key.

5.2 Correlation Display

The left/right channel correlation factor is displayed from -1 to +1 with 3 LEDs.

With these 3 LEDs 5 ranges of correlation can be discriminated:

+1.0 to

+0.6

+0.6 to

+0.2

+0.2 to

-0.2

-0.2 to

-0.6

-0.6 to

-1.0

5.2.1 Missing Audio Signal Indication

The correlation display is also used to indicate when the digital audio signal is missing. In this case all three LEDs

are flashing synchronously.

5.3 Numerical 7-Segment Display

The numerical display indicates measured loudness values during normal operation and settings in Setup Mode.

During normal operation the display may optionally display:

 The Short Term Level value STL,

 the Loudness Integrated value INT and

 the Loudness Range value LRA.

Selection is done by keys STL, INT and LRA. After power-up the 7-segment display shows the

Short Term Level.

For the values STL and INT, the readout can be selected between LU/LUFS:

 For LUFS (Loudness Units Full Scale) the key LUFS is pressed so that it is lit.

 For LU (Loudness Units relative) the key LUFS is pressed so that it is not lit. The displayed value is

referenced to the LU reference level mentioned above.

5.3.1 Switching the Numerical Display On or Off

 In LM display mode the numerical display and the LEDs in the keys below are always on.

 In PPM display mode it can be selected whether the numerical display and the LEDs shall be on or off.

In order to select between display on and off in PPM mode, select PPM mode first.

 To turn the display off, press the key with the blue LED on. The display will be switched off.

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

 To turn the display on, press any key under the display. The display will be switched on.

5.3.2 Clip Indication

The numerical display is also used to indicate when the audio signal is clipped, even in PPM display mode when it is

off.

Clipping is defined as three sequential samples with their 16 MSBits to be either = 7FFF (hex) or <= 8001 (hex).

Clipping is indicated by the word ‘CLIP’. Refer to chapter ‘Clip Indication Time’ for display options.

5.4 Input Selection AES, SDI and Analog

Selection between the inputs is done by pressing the key IN for a longer time:

 After pressing the IN key for a minimum time of 800 ms the selected input is displayed as soon as the

key is released but it cannot be changed. The middle blue key starts flashing in order to indicate that it now

works as ‘Exit’ ( ▌) key.

 After pressing the IN key for a minimum time of 5 s the selected input is displayed and can be

changed. All three blue keys start flashing. This indicates that the three keys now work as ‘Up’

(▲), ‘Down’ (▼) and ‘Exit’ ( ▌) keys.

The selected input is indicated in the numerical display. 0 corresponds to the AES input, 1, 2, 3 and 4 are the SDI

stereo signal pairs and A is the analog input.

AES: Press the key IN a long time (longer than 5 s), then press key ‘Up’ (▲) or ‘Down’ (▼) until ‘In 0’ is visible

in the numerical display and then ‘Exit’ ( ▌).

ADC: When an ADC is installed it is selected by pressing the key IN a long time (longer than 5 s) and afterwards

pressing key ‘Down’ (▼) until ‘In A’ is visible in the numerical display.

SDI: When a 3G-SDI module is installed each of its four outputs is selected by pressing the key IN a long time

(longer than 5 s) and afterwards pressing keys ‘Up’ (▲) or ‘Down’ (▼) until the desired input ‘In 1’ to

‘In 4’ is selected.

5.5 Start, Stop, Pause INT and LRA

Pressing the Pause/Run key shortly starts the INT (Loudness Integrated) and the LRA (Loudness Range)

measurement. Another short push lets them pause, then continue again and so on.

During running measurements the Pause/Run key is lit green. It is lit red when the measurements are paused. It

is lit yellow when the measurements are running but the STL resp. the MOM value is ignored because its level is

below the ‘Absolute Gating Threshold’ of -70 LUFS as defined by the EBU.

After power-up both measurements are reset and stopped (the key is lit red). As long as no valid measured value

is present, ‘----’ is displayed when the INT or LRA value is selected for display. As soon as the measurements

have been started and the level is above -70 LUFS the display shows the corresponding INT or LRA value which has

been evaluated since the start of the measurements.

The measurements can be reset as well while they are running (key is lit green or yellow) as during pause (key is

lit red) by pressing the RESET key for a longer time (minimum 800 ms).

5.6 Display Options

The LM 128P offers display options for

 COLOR Scheme,

 Brightness (BRIGHT) and

 LED bar yellow (G◄─►R)

These three settings are initiated by pressing the desired blue key for a longer time:

 After pressing the key for a minimum time of 800 ms the selected setting is displayed as soon

as the key is released but it cannot be changed. The middle blue key starts flashing in order to indicate that it

now works as ‘Exit’ ( ▌) key.

 After pressing the key for a minimum time of 5 s the selected setting is displayed and can be changed. All three

blue keys start flashing with the selected key flashing inversely. This indicates that the three keys now work as

‘Up’ (▲), ‘Down’ (▼) and ‘Exit’ ( ▌) keys.

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

A numerical equivalent of the corresponding setting is indicated by the 7-segment display.

COLOR The user may choose his preferred color pattern for the LED bars and also between bar display and dot

display by selecting color schemes.

 With a bar display all LEDs up to the measured value are

lit, all others are adjustable weakly lit or off.

 With a dot display all LEDs are adjustably weakly lit or off

while the measured value is indicated by a bright yellow

LED.

Color schemes are different for LU and PPM bars. When the LU display mode is selected, the user can

choose between color schemes provided for the LU Display Mode and when the PPM Display Mode is

selected, the user can choose between color schemes provided for the PPM Display Mode.

Positive numerical values indicate bar display settings while negative values indicate the same color

scheme but as dot display.

These color patterns are available for LU bars:

In the LU display mode the color schemes (color patterns and bar/dot display) of both LED bars can be

chosen individually: At first the color pattern of the upper LED bar is selected for setup. Each time the

COLOR key is pressed again for a minimum time of 800 ms the other LED bar is selected.

These color patterns are available for PPM bars:

Combined bar and dot display, read below

Red starts at 0 dB

Yellow starts at 0 dB

Red starts at 0 dB

Yellow covers -9 dB to 0 dB

Yellow covers -10 dB to 0 dB

Yellow/green segments, borders at

-50, -40, -30, -20, -10, -5 and 0 dB

With pattern 0 both, the peak program value and the digital peak value are displayed:

Value Peak Program Value Digital Peak Value

EBU aka QPPM SPPM or Fast PPM

Attack Time 10 ms to 90% Zero (one sample)

Decay time 20 dB/1.5s

Displayed by Bar Yellow dot

100% Full scale at +9 dB (out of scale) 0 dB (green/red segment border)

20 dB Gain added optionally Yes No

BRIGHT With this setting the operator can suit the brightness of all displays (LEDs) according to his

preferences.

128P

Loudness and Peak Program Meter according to EBU R 128

SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany

Tel.: +49 5131 464272 * www.ssb-audio.com * info@ssb-audio.com

The background brightness can be adjusted by pressing the BRIGHT key a second time again for a

minimum time of 800 ms.

G◄─►R With this setting the tint of the LEDs set as yellow can be changed between red and green resulting in

further variations for the color schemes. Particularly for color pattern 6, where all LEDs are yellow, the

user may select his preferred monochrome tint for the LED bar between green, different variations of

yellow up to red.

5.7 Reference Level Settings and Clip Indication Time

Attention: For correct measurements the Reference Level Settings must be set correctly. Wrong settings, e.g.

accidentally misadjusted settings, lead to hardly noticeable false measurements!

These three settings are initiated by pressing the LM/PPM key together with the IN key for a

longer time (minimum 800 ms). All three blue keys start flashing. Now the desired setting is

selected by pressing the corresponding blue key for a short time whereby the selected key starts to flash inversely.

The three keys now work as ‘Up’ (▲), ‘Down’ (▼) and ‘Exit’ ( ▌) keys.

5.7.1 LU Reference Level

The LU reference level for the measured LU (Loudness Unit) value can be set between -30 LUFS and 0 LUFS in

steps of 1 LU. According to the EBU R 128 this setting shall be -23 LUFS for the EBU Mode. With a setting other

than -23 LUFS the LM 128P will no longer work in the EBU Mode.

The LU reference level can be changed after pressing the LM/PPM key together with the IN key for a longer time

(minimum 800 ms) followed by pressing the STL/COLOR key shortly. During setup the numerical display shows

the LU reference level as LUFS.

5.7.2 ADC Full-Scale dBu-Level

When the LM 128P is equipped with an ADC the analog input’s gain can be adjusted in 25 steps of 1 dB each so

that the digital full-scale value is between 0 dBu and +24 dBu.

Example: A setting of 18 means that an analog signal of +18 dBu is converted to 100% FS. In other words, a sine

signal of +18 dBu and 1 kHz applied to both inputs L and R results a measured value of 0 LUFS and a

sine signal of +9 dBu is displayed as a peak program value of 0 dB. (This setting corresponds to the

standard reference level of the ITU-R BS.645-2).

Standard settings are:

Recommendation

Full-Scale dBu-Level

Setting

Analog Level

resulting in

Digital 100% FS

Nominal Level resp.

Permitted Maximum Level

0 dB

Alignment Level

–9 dB

ITU-R BS.645-2 18 +18 dBu +9 dBu 0 dBu

ARD HFBL-K 15 +15 dBu +6 dBu -3 dBu

The ADC full-scale dBu-level can be changed after pressing the LM/PPM key together with the IN key for a longer

time (minimum 800 ms) followed by pressing the INT/BRIGHT key shortly. During setup the numerical display

shows the ADC full-scale dBu-level in dBu.

5.7.3 PPM Reference Level

The PPM reference level is fixed according to IEC 268-10/1 so that an input signal of -9 dB FS is displayed at 0 dB

on the PPM scale.

5.7.4 Clip Indication Time

The clip indication time is the time during which the word ‘CLIP’ is displayed in the numerical display after

clipping of a digital audio signal has been detected. It can be set to 0.2 – 0.3 – 0.5 – 0.7 – 1.0 – 1.4 – 2.0 – 3.5 –

7.0 - 10 seconds. It also can be set to ‘ OFF’ which indicates that no clipping is displayed. Additionally it can be

set to infinite (‘ On’). In this case the display must be cleared manually by either of the three blue keys

(STL, INT or LRA).

The clip indication time can be changed after pressing the LM/PPM key together with the IN key for a longer time

(minimum 800 ms) followed by pressing the LRA/G◄─►R key shortly. During setup the numerical display shows

the clip display time in seconds resp. the settings ‘ On’ or ‘ OFF’.

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