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VT RTA-168
PC based USB Real Time 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 and a microphone clip)
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 CD (contains a list of audio test tones and noises)  (AudioTestCD.zip or AudioTestCD.rar)
7) 1/8” TRS cable (1.8m)
8) Black Soft Pouch Case
9) Individual Sound Level Calibration Data
10) Individual Microphone Calibration Data (only provided in RTA-168B)
11) A small microphone stand

2. VT RTA-168 Series Hardware Configuration

  RTA-168A RTA-168B
Measurement Microphone ECM999
XLR-to-USB Converter 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 25dB ~ 110dB, 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, 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

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 was 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 Application Articles

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

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

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