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VT RTA-168A/B
VT-RTA-168
PC based USB Real Time Acoustic Analyzer, Sound Level Meter, Distortion Analyzer, Polarity Tester ...                   Brochure       Manual
VT RTA-168A     US$299.95     Free Express Shipping
VT RTA-168B    US$349.95     Free Express Shipping
VT RTA-168A comes with an ECM999 measurement mic while VT RTA-168B comes with an EMM-6 measurement mic. Both microphones have an extremely flat frequency response from 20Hz to 20kHz. Each EMM-6 also comes with its very own frequency response file, which can be used in the software to further improve the accuracy.

VT RTA-168, a PC based USB Real Time Anayzer, Sound Level Meter, Distortion Analyzer
Download and try the fully functional Multi-Instrument software using your sound card as the ADC and DAC device!


1.  Package Contents

1) Measurement microphone and its accessories (a windshield, a microphone clip and a small microphone stand)
2) XLR-to-USB Converter
3) USB cable (1.5 m)
4) CD (contains the copy-protected Multi-Instrument Software)
5) USB hardkey (contains a Multi-Instrument Standard License)
6) Audio Test WAV files (contains a list of audio test tones and noises)  (download at AudioTestCD.zip or AudioTestCD.rar)
7) 1/8” TRS cable (1.8m)
8) Black Soft Pouch Case
9) Unique Sound Level Calibration Data (in CD)
10) Unique Microphone Calibration Data (only provided in RTA-168B, in CD)
     
      Unique Calibration Files Download:
                  
RTA-168A XLR-to-USB Serial Number V110-XXXX-XXXX-XXXX
                   RTA-168B Microphone Serial Number XXXXX
                  

2. VT RTA-168 Series Hardware Configuration

  RTA-168A RTA-168B
Measurement Microphone ECM999
EMM-6
XLR-to-USB Converter VT XLR-to-USB Pre

VT XLR-to-USB Pre

 

3. Overall VT RTA-168 Specifications

 
Frequency Range 20Hz ~ 20kHz
Sampling Rate 44.1kHz / 48kHz
Bit Depth 16 Bits
Number of Input Channels 1
Frequency Accuracy 0.01%
Frequency Weighting Flat, A, B, C, ITU-R 468
Time Weighting Linear, Exponential
(Equivalent Continuous Sound Level (Leq) fully complies with IEC61672)
Sound Level Measurement Range 35dB ~ 125dB (typical), adjustable through both the hardware gain switch and software gain slider. Recalibration is not required after the gain setting changes.
Sound Level Measurement Accuracy ± 0.3 dB at 94dB, 1kHz after calibration
Sound Level Calibration Calibrated using Type 1 Sound Level Calibrator
Octave Analysis 1/1, 1/3, 1/6, 1/12, 1/24, 1/48, 1/96
(Complies with IEC61260)
Other Functions THD, THD+N, SINAD, SNR, SMPTE IMD, DIN IMD, CCIF2 IMD, Frequency Response, etc. 
Much more functions are described in the software manual.
System Requirements Windows XP/VISTA/7/8/8.1/10, 32 bit or 64 bit. Minimum Screen Resolution: 1024 × 600

 
4. Measurement Microphone ECM999 Specifications (for VT RTA-168A)

Transducer Type Back Electret Condenser
Element Pressure, FET Preamplifier
Polar Pattern Omni-directional
Frequency Response 20Hz ~ 20kHz
Open Circuit Sensitivity (at 1kHz) 14mV/Pa (-37dBV/Pa)
Rated Impedance 200Ω
Minimum Load Impedance 3000Ω
Equivalent Noise Level (A-weighted) 22dB
Max. SPL (1kΩ load) 132dB (THD<1%, 1kHz)
Dynamic Range (1kΩ load) 106dB
Pin Polarity Pin 2 outputs positive voltage (with reference to Pin 3) when diaphragm receives positive pressure. (Diaphragm moving inward)
Connector 3 pin male XLR
Finish Rugged Metal Construction, Solemn black finish
Weight 150g
Signal-to-Noise Ratio 70dB
Power Supply 9~52V Phantom
Dimensions Φ21.0 × 193.0 mm
Environmental Conditions Temperature: -10°C ~ +50°C;                Relative Humidity: 0~95%
RoHS Compliance
 

Typical Polar Pattern of ECM999


Typical Frequency Response of ECM999

5. Measurement Microphone EMM-6 Specifications (for VT RTA-168B)

Transducer Type 6mm Electret Condenser
Polar Pattern True Omni-directional
Element Low Noise FET Input reduces low-frequency distortion
Frequency Response 18Hz~20kHz
Sensitivity (at 1kHz into 1kΩ) 10mV/Pa (-40dBV/Pa)
Impedance 200Ω between Pin 2 and Pin 3
Max. SPL (1kΩ load) 127dB (THD<1%, 1kHz)
Connector Gold plated 3 pin male XLR
Finish Rugged Metal Construction, Silver finish
Weight 144g
Signal-to-Noise Ratio 70dB A-weighted
Power Supply 15~52V Phantom
Dimensions Φ21.0×193.0 mm
Environmental Conditions Temperature: -10°C ~ +50°C;           Relative Humidity: 0~95%
RoHS Compliance
Calibration Individually calibrated. Calibration file included.



Typical Frequency Response of EMM-6
Note: This is only a typical frequency response chart. EMM-6 measurement microphone is calibrated individually by its US microphone manufacturer and the calibration data is included in the product package.


6. VT XLR-to-USB Pre Specifications

Frequency Response 20Hz ~ 20kHz: -0.2dB / -0.1dB
-3dB: 6Hz ~ 23.5kHz
Sampling Rate 44.1kHz / 48kHz
Bit Depth 16 Bits
Number of Input Channel 1
THD (1kHz, -1.9dBFS) 0.0062%
THD+N (1kHz, -1.9dBFS) 0.013%
SMPTE IMD (-1.9dBFS) 0.02%
DIN IMD (-1.9dBFS) 0.02%
IMD at 1kHz (19kHz and 20kHz, -1.9dBFS) 0.002%
Dynamic Range (hardware gain switch at LO) 78.4 dB
Description · Studio-quality USB microphone pre-amplifier
· Supplies 48V phantom power for condenser microphones
· No special drivers required
· Fully balanced low noise analog front end
· 3-position analog gain control
· Compact travel size Φ22 mm × 144 mm long 


Typical Frequency Response



Typical THD and THD+N Measurement



Typical IMD Measurement


7. Flexible Hardware Connections

VT RTA-168 Connection Diagram 1
Method 1



VT RTA-168 Connection Diagram 2
Method 2

8. Some Applications

1. Polarity Check for Speakers, Microphones and Amplifiers using Multi-Instrument


2. Magnitude Frequency Response Measurement using Octave Analysis with Periodic Pink Noise Excitation (no averaging is required unlike the case of pink noise)



3. Measurement of Reverberation and Its Related Acoustic Parameters using the Interrupted Noise Method (Note: Multi-Instrument Pro or above is required)

Reverberation Time RT60 Measurement using Interrupted Noise


4. Measurement of Reverberation and Speech Intelligibility Parameters using the Integrated Impulse Response Method (Note: Multi-Instrument Pro or above is required)

Reverberation Time RT60 and Speech Transmission Index STI Measurement using Integrated Impulse Response

Reverberation and Speech Intelligibility Measurement using Integrated Impulse Response


5. Discontinuity Measurement for Detection of Glitch, Digital Dropout, Speaker Rub and Buzz (Note: Multi-Instrument Pro or above is required)

Discontinuity Measurement for the Detection of Glitch, Digital Dropout, Speaker Rub and Buzz


6. Sound Quality Measurement Example - Loudness, Loudness Level, Sharpness of a white noise in a Free Field (Note: Multi-Instrument Pro or above is required)

Sound Quality Measurement - Loudness, Loudness Level, Sharpness of White Noise in a Free Field


7. How to fit the ECM999 measurement microphone (in VT RTA-168A) into its clip? See video:  http://www.virtins.com/video/ECM999clip.3gp
more>>

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