Precision Audio and AV Interface Products

Radio Design Labs

RU-SM16A 2 Channel Audio Meter

  • Precision Audio Level Metering
  • Digital 16 LED String Display Indication
  • Two Mono Meters or Stereo Metering
  • Line-Level, Speaker-Level or 25/70/100 V Audio Input
  • Selectable Fixed or Variable Calibration
  • Individual Channel Calibration Controls
  • Selectable Peak or Average Metering
  • Peak-Hold Display for +10, +14, +18 dB
  • Overview
  • Specifications
  • Related Products
  • Accessories
  • Downloads
  • How to Buy
  • Product Series
  • Dimensions

The RU-SM16A is the ideal choice in most applications where audio level metering is to be designed into a system or added to existing equipment. The RU-SM16A has two separate inputs. Each input may be individually calibrated for unbalanced consumer, balanced professional, 8 Ohm speaker line or constant voltage speaker lines (25 V, 70 V or 100 V). All connections are made using detachable terminal blocks.

A rear-panel switch selects variable or fixed calibration for 25V, 70V, 100V and +4 dBu sources. In the "variable" position, front-panel multi-turn trimmers adjust the calibrated meter levels.

Rear-panel switches 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 either mode the upper three LEDs (+10, +14, +18) remain in the PEAK HOLD mode.

The RU-SM16A uses bright LEDs for good visibility. Each channel input has a label area for identification of the source or function being metered.

Applications

Inputs (2):
Line level or Amplified speaker level
Input Impedance:
> 40 kΩ balanced or unbalanced
0 dB Calibration:
Fixed or Variable (switch-selectable)
Fixed Input Level:
+4 dBu (+4 switch settings, for 0 dB reading)
25 V* (25 V switch settings, for 0 dB reading)
70 V* (70 V switch settings, for 0 dB reading)
100 V* (100 V switch settings, for 0 dB reading)
Variable Input Level Range:
-24 dBu to +12 dBu (+4 switch settings, for 0 dB reading)
2 V to 90 V* (25 V switch settings, for 0 dB reading)
4 V to 90 V* (70 V switch settings, for 0 dB reading)
5 V to 100 V* (100 V switch settings, for 0 dB reading)
*Constant-voltage or low-impedance (4 Ohms, 8 Ohms) amplifier output
Metering Freq. Response:
20 Hz to 20 kHz
Indicators:
SIG, -20, -15, -12, -9, -6, -3, -2, -1, 0, +1.5, +3, +6, +10, +14, +18
(+10, +14, +18 are PEAK HOLD indicators only)
Metering Response:
Each channel individually selectable PEAK or AVG (switch-selectable)

  Rise Time (10% to 90%):
  Rise Time (0% to 100%):
  Fall Time (90% to 10%):
  Fall Time (100% to 0%):
Peak Mode Average Mode
50 us            130 ms
60 us            300 ms (VU Characteristic)
65 ms           185 ms
100 ms         300 ms (VU Characteristic)
Ambient Operating Environment:
0° C to 55° C
Power Requirement:
GROUND-REFERENCED, 24 Vdc @ 250 mA
Package Type:
Cardboard Box
Package Dimensions:
6 x 6 x 2.625 in.
Shipping Weight:
1.205 lbs.
WEEE weight:
0.965 lbs.
Tariff code:
9030.33.3800

Documents:
Format
PDF
CAD Files:
Format
High Res Images:
Format
Declaration of Conformity:
Format

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RACK-UP SERIES

RACK-UPs are the original 1/3 rack width 1RU rack-mountable modules for the A/V, recording and broadcast industries. Module functions include mixing, switching, pre-amplification, power amplification, distribution, gain control, equalization and more. Some RACK-UP modules are constructed in solid encapsulated durable industrial black plastic enclosures; MAX RACK-UPs are assembled using heavy duty extruded aluminum and steel panels. The rear panels feature clear bold white lettering for the terminal blocks and connectors. Reverse-printed front-panel polycarbonate laminates provide an attractive, durable finished appearance for rack-mounted or free-standing use.

Since RDL first originated 1/3 rack width modules, RACK-UPs have led the industry in economical, high-performance and cost-effective long life solutions in system designs. Multiple RACK-UP modules may be interconnected, or may be connected with other RDL modules to form all or part of an A/V system. Certain RACK-UP modules are often used free standing; all RACK-UPs may be rack mounted. A complete range of mounting options is available for systems comprised of multiple modules.

RACK-UP modules provide input, output and control connections through terminal blocks and connector (or both) according to common usage in professional installations. Front panels are equipped with connectors, user controls and LED metering, as appropriate.

Functions and features provided by RACK-UPs, since their introduction, are still available today. This continuity in product offering and support makes RACK-UP modules a preferred long-term resource for system design solutions. RACK-UP SERIES modules are designed and manufactured in the U.S.A.

RU-SM16A RU-SM16A