LM 128P
Loudness and Peak Program Meter according to EBU R 128
6
SSB AUDIO GmbH * Sonnenweg 25 * 30827 Garbsen, Germany
Tel.: +49 5131 464272 * www.ssb-audio.com * [email protected]
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.
