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.
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-168A/B
Hardware Configuration
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
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
Method 1
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)
4. Measurement of Reverberation and Speech Intelligibility Parameters
using the Integrated Impulse Response Method (Note:
Multi-Instrument Pro or above is required)
5. Discontinuity Measurement for Detection of Glitch, Digital
Dropout, Speaker Rub and Buzz (Note: Multi-Instrument Pro or
above is required)
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)
Manual
