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RION Sound level meter Unit UN-14

Build flexible measurement systems for simultaneous measurement of sound and vibration.

The UN-14 is a single-channel sound level meter unit designed for connection of a measurement microphone and preamplifier. The chassis of up to 16 units can be linked to create a multi-channel configuration.
Two types of input connectors are provided (7-pin and BNC), providing support for the following types of microphones and preamplifiers.

Sound Level Meter Unit






  • UN-14 and UV-15 (Vibration Meter Unit) can be linked in a measurement system with up to 16 channels.
  • Backlit LCD and LED warning indicators.
  • Rack mount capability for shop floor or laboratory installations. (JIS compliant rack CF-27 available as option)
  • Option: Battery Pack Unit (BP-17), Interface unit (UV-22)

N-14 Specifications


Inputs Number of measurement channels 1
Connectors 7-pin input connector For measurement microphone or preamplifier (max. input voltage ±10 V) (excl. UC-34P connection)
Microphone bias voltage +30 V, +60 V, +200 V
BNC connector For CCLD compliant microphone or preamplifier (24 V 4 mA)
For TEDS compliant microphone (24 V 4 mA)
Frequency weighting characteristics A, C, Z (JIS C 1509-1 Class 1 electrical characteristics)
Measurement level range A 30 to 128 dB (using UC-59, NH-17)
C 36 to 128 dB (using UC-59, NH-17)
Z 41 to 128 dB (using UC-59, NH-17) (HPF 20 Hz, LPF 20 kHz)
Frequency range 1 Hz to 80 kHz (20 Hz to 40 kHz ±0.5 dB) (1 Hz to 80 kHz ±3 dB)
Sensitivity setting Setting range -10.0 to 59.9 dB/Pa in 0.1 dB/Pa steps
Level range settings 6 settings (level range changes with sensitivity setting)
Sensitivity Level range
-10.0 to -19.9 70 dB to 120 dB in 10-dB steps
-20.0 to -29.9 80 dB to 130 dB in 10-dB steps
-30.0 to -39.9 90 dB to 140 dB in 10-dB steps
-40.0 to -49.9 100 dB to 150 dB in 10-dB steps
-50.0 to -59.9 100 dB to 150 dB in 10-dB steps
Time weighting characteristics F, S, 10 ms (JIS C 1509-1 Class 1 electrical characteristics)
Display Segment-type LCD with backlight (constantly on)
Display contents Unit settings, instantaneous value (1-s cycle), bar graph (100-ms cycle)
Warning indications LED x 2
Right-side LED Normally out. Lights up in red to indicate overload.
Left-side LED Master/Slave indication (when linked to UV-22). Normally out. Lights up to indicate Master operation
Filters HPF (attenuation -18 dB/oct, -3 dB drop) 20 Hz, OFF
(user filter supported with UV-22)
LPF (attenuation -18 dB/oct, -3 dB drop) 20 kHz、OFF
(user filter supported with UV-22)
Calibration signal output
(for calibration of subsequent unit)
AC output Sine wave 1 kHz ±2 %, output signal 0.5 V (RMS) ±2 %
DC output +3.2 V ±1%
Output BNC connector
AC output Output impedance 600 Ω
Output voltage 1 V (RMS) ±2 % at range full-scale point
Max. output voltage ±5 V (peak) (no overload)
Dynamic range 80 dB or more (1 Hz to 80 kHz), 85 dB or more (20 Hz to 20 kHz)
Load impedance 10 kΩ or more
DC output Output impedance 50 Ω
Output voltage +3.5 V±1 % at range full-scale point (0.5 V/10 dB)
Max. output voltage +5 V
Dynamic range 40 dB or more (1 Hz to 80 kHz), 60 dB or more (20 Hz to 20 kHz)
Output impedance 10 kΩ or more
Residual noise Input converted residual noise
4 μV(RMS) or less (Z, 1 Hz to 80 kHz), 2 μV(RMS) or less (Z, 20 Hz to 20 kHz),
1.5 μV(RMS) or less (A, C)
Power supply 9 V to 15 V DC
Suitable AC adapter: NC-99A, Battery Pack Unit BP-17,
Automotive 12 V battery can also be used
Temperature/humidity range for operation -10 ℃ to +50 ℃, max. 90 % RH (no condensation)
Dimensions and weight 150 (H) × 36 (W) × 179 (D) mm (without protruding parts), approx. 500 g
Accessories Link plate x 1

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