RU SM12

User Manual: RU-SM12

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TM

RDL

®

TM

R a d i o D e s i g n L a b s™

Specialists in Practical Precision Engineering™

RACK-UP® SERIES
Model RU-SM12
Dual Audio Meter
ANYWHERE YOU NEED...
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Precision Audio Level Metering
Digital String Display Indication
Precise Left/Right Meter Tracking
Individual Channel Calibration Controls
Selectable PEAK or AVERAGE Metering
Selectable Metering of Peak L+R/L-R
1/3-Rack, High-Density Rack Mounting

You Need The RU-SM12!
The RU-SM12 is part of the group of RACK-UP products from Radio Design Labs. RACK-UPs feature the advanced circuitry for
which RDL products are known, combined with accessible user-friendly controls and displays. The ultra compact design permits
high-density installations, with three products mounted in a single rack unit! Single RACK-UPs can be mounted right where they
are needed using the adhesive method popularized by RDL’s STICK-ON™ series of products. Optional brackets permit mounting
a RACK-UP module above, below, or in front of any flat surface!
APPLICATION: The RU-SM12 is the ideal choice in most applications where audio level metering is to be designed into a
system, or added to existing equipment. All connections are made using full-size barrier block terminals on the rear panel.
The RU-SM12 has two separate line level inputs. Each input permits the connection of either balanced or unbalanced, high or low
impedance audio lines.
When a stereo source is used, one channel is connected to each of the two inputs. In this configuration, the RU-SM12 provides a
separate display for each input. The level calibration reference is user adjustable from the front panel. Unlike meters that use an
off-the-shelf chip, the RU-SM12 develops a single precision reference for each metering increment. Comparators are used to
switch the LEDs in the string display, with the respective comparators for each channel connected to the same reference.
Therefore, when the input calibration controls are set equally, each channel’s LED for a given dB value will switch on at exactly
the same audio signal level. The metering sample is derived from an active, precision full-wave rectification circuit. Isolation
between channels is amply sufficient to use the RU-SM12 to meter two monaural signals simultaneously.
Jumpers on the rear panel allow the installer to set each meter individually for either peak or average audio level display. In
stereo applications, either peak or average is typically selected. In monaural installations, it may be advantageous to feed the
mono source to both meters, setting one for peak and the other for average.
In stereo applications where it is desired to monitor the L+R and L-R components, the RU-SM12 has integral sum and difference
amplifiers. Rear panel jumpers are used to strap these amplifiers to the meter inputs. This feature makes the RU-SM12 ideal for
instantly visually identifying out-of-phase signal problems in stereo systems.
The RU-SM12 uses large LEDs for good visibility. Each channel input has a write-on label area for identification of the source or
function being metered.
Wherever an audio meter is needed to provide superior visual clarity, precise channel tracking, user calibration, reliability,
compactness and unsurpassed versatility, the RU-SM12 is the choice. Use the RU-RA3 rack-mount adapter to mount multiple
RU-SM12s, or to combine related products (such as audio mixing or audio distribution) into a single rack unit!

DTS0055B Typical Performance reflects product at publication time exclusive of EMC data, if any, supplied with product. Specifications subject to change without notice.

RU-SM12 Dual Audio Meter
Rear Panel View

AUDIO INPUTS: Connect Channel A balanced audio to A+, A-, and shield to GND. Connect Channel A unbalanced
audio to A+ and GND. Connect A- to the GND terminal. If unit is being used for stereo, connect Channel B similarly to
Channel A
PEAK METERING: Connect a jumper from A SIG to A MTR. Connect a jumper from B SIG to B MTR. Note that the
SIG terminals are the rectified output from the audio input stage; the MTR terminals are the input to the metering
stage.
AVERAGE METERING: Connect a jumper from A SIG to A MTR. Connect a jumper from B SIG to B MTR. Also
connect a jumper from A SIG to A AVG. Connect a jumper from B SIB to B AVG.
COMBINATION METERING OF MONO SIGNAL: A mono signal can be connected to both the A and B inputs.
Connect the A SIG terminal to the A MTR terminal. Jumper together the B SIG, B AVG, and B MTR terminals. The
meter will now display the peak signals on the A meter string, and the average signal level on the B meter string.
L+R/L-R METERING: Connect L+R terminal to the A MTR terminal. Connect the L-R terminal to the B MTR terminal.
The A meter will now read the sum signal; the B meter will read the difference signal. Prior to connecting in this
mode, it is recommended to first connect the meter for normal stereo operation and set the calibration controls for
precisely the same level.
POWER CONNECTION: Connect a single-ended 24 Vdc power source to the +24 VDC terminal. Connect the ground
return from that supply to the adjacent ground terminal. Power supply ground and circuit ground are common.
TYPICAL PERFORMANCE
Inputs (2):
Input Impedance:
Input Range (sensitivity):
Metering Frequency Response:
Indicators (24):
Metering Response:
Power Requirement:
Mounting:
Dimensions:

Line Level
10 kΩ Balanced or Unbalanced
For 0 dB reading, -26 dBu to +12 dBu
20 Hz - 20 kHz
12 LEDs per channel; -20, -15, -12, -9, -6, -3, -2, -1, 0, +1.5, +3, +6
Normal mode Selectable PEAK or AVERAGE; Sum/Difference mode PEAK
24 to 33 Vdc @ 400 mA, Ground-referenced
Rack-mount using any one of several rack mount chassis accessories
or other mounting accessories listed in the short form catalog or product CD-ROM.
Height:
1.7 in.
4.3cm
Length:
5.8 in.
15.0cm
Depth:
2.0 in.
5.1cm (case only)
2.5 in.
6.4cm (case including barrier block)

EMC:

RDL • P.O. Box 1286 • Carpinteria, CA., USA 93014 • (805)684-5415 • FAX (805)684-9316 • Fax-on-Demand (800) 391-0017 • http://www.rdlnet.com
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