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VIRTINS VT RTA-168A/B, Manual

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VIRTINS VT RTA-168A/B Manual Download Page 27

VT RTA-168A/B Manual Rev. 1.5 

 

www.virtins.com                                                             27                              Copyright © 2010-2020 Virtins Technology 
 

Virtins Technology 

2.5 VT XLR-to-USB Pre Specifications 

Frequency Response 

20Hz ~ 20kHz: -0.2dB / -0.1dB 
               -3dB:  6Hz ~ 23500Hz 

Sampling Rate 

44.1kHz / 48kHz 

Bit Depth 

16 Bit 

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 

22  mm  x  144 

mm long 

 

 

Typical Magnitude Frequency Response 

 

Summary of Contents for VT RTA-168A/B

Page 1: ...ology Virtins Technology VT RTA 168A B Manual A Real Time Acoustic Analyzer Sound Level Meter Distortion Analyzer Polarity Tester Note VIRTINS TECHNOLOGY reserves the right to make modifications to this manual at any time without notice This manual may contain typographical errors ...

Page 2: ... Input Gain via Hardware Gain Switch 15 1 5 6 0dB Reference Vr 16 1 6 MICROPHONE FREQUENCY COMPENSATION 16 1 7 TWENTY MOST FREQUENTLY USED MEASUREMENT SETTINGS 18 1 8 MORE ACOUSTIC ANALYSIS FUNCTIONS AVAILABLE IN MULTI INSTRUMENT PRO OR ABOVE 21 1 9 LIST OF AUDIO TEST WAV FILES AUDIOTESTCD ZIP 21 1 10 OPERATION NOTES 23 2 SPECIFICATIONS 24 2 1 VT RTA 168A B HARDWARE CONFIGURATION 24 2 2 OVERALL VT...

Page 3: ...crophone and its accessories a windshield a microphone clip and stand 2 XLR to USB sound card 3 USB cable 1 5 m 4 CD containing the copy protected Multi Instrument Software The latest software can always be downloaded from www virtins com MIsetup exe 5 USB hardkey containing a Multi Instrument Standard License 6 Audio Test WAV files containing a list of audio test tones and noises Measurement Micr...

Page 4: ... Calibration Data only provided in RTA 168B in CD 1 2 Hardware Connection Diagram There are two connection methods with or without the XLR cable between the measurement microphone and the XLR to USB sound card Connection Method 1 without XLR cable Unscrew the XLR shield on the XLR to USB sound card and connect the sound card directly to the measurement microphone Then connect the corresponding end...

Page 5: ...under the 21 day fully functional free trial mode before the trial period expires Test Signal Generation You can generate the test signals from the Signal Generator of Multi Instrument The XLR to USB sound card does not have any audio output channels so you need to use your computer s built in sound card or any other sound card for audio test signal output The quality of the test signals would dep...

Page 6: ...alyzer and Multimeter etc 1 4 1 Install Multi Instrument Insert the Multi Instrument installation CD into your computer s CD ROM drive and follow the instruction on the screen to install the Multi Instrument software The installation file can also be downloaded from www virtins com MIsetup exe 1 4 2 Start Multi Instrument To start Multi Instrument on the Windows desktop select Start All Programs M...

Page 7: ...xecuted all calibration data entered manually via Setting Calibration after software installation will be reset to the default values of the selected product To avoid the loss of the manually entered calibration data you can save them as a calibration file first Otherwise you will have to enter the unique calibration data that come with the product package again After the default device is selecte...

Page 8: ...p in HTML format on Windows Start menu or Help Software Manual or F1 inside the software 1 4 3 Configure Multi Instrument In Multi Instrument the menu items are enabled disabled based on context Many menu items are disabled when the Oscilloscope or the Signal Generator is running To do the configuration stop the oscilloscope first by pressing the green button at the upper left corner of the screen...

Page 9: ...by pressing the red button at the upper left corner of the screen and then talk before the measurement microphone you should be able to see your voices in the Oscilloscope and Spectrum Analyzer 1 4 3 2 Configure Sound Playback Devices for Multi Instrument The XLR to USB sound card does not have any audio output channels but you can use your computer s built in sound card or any other sound card fo...

Page 10: ...d triangle button at the upper right corner of the Signal Generator panel you should hear a 1kHz test tone from the speaker or earphone connected to the selected playback sound card Press it again to stop the sound 1 5 Input of Sound Level Calibration Data and Adjustment of Input Gain Sound Level Calibration is not required for those relative measurements such as frequency response THD THD N IMD e...

Page 11: ...vel measurement range by adjusting the input gain of the XLR to USB sound card through its hardware gain switch and or the software 1 5 1 Under Windows XP or a Windows Version Before XP Input of the Sound Level Calibration Data Note the calibration data in the following figure are examples only you should enter the actual calibration data provided inside the product package Adjustment of Input Gai...

Page 12: ... 60 Mic 40 and Mic 20 in the above figure It should be noted that the selection status of these radio buttons does not necessarily reflect the actual input gain For example when you open the Calibration Setting dialog box if the selected radio box is Mic 80 it does not necessarily mean the current input gain is set at 80 The actual input gain is reflected by the Mixer status under the Sound Card I...

Page 13: ... you open the Calibration Setting dialog box if the selected radio box is Mic 80 it does not necessarily mean the current input gain is set at 80 The actual input gain is reflected by the Mixer status under the Sound Card Input Status in the above figure You can press the Refresh button to make sure the status display has been refreshed Unlike Windows Vista the input gain is adjustable in the Soun...

Page 14: ...nd select Properties the right part of the figure above will be shown You can then adjust the input gain through the Microphone slider 1 5 4 Under Windows 8 8 1 10 Input of the Sound Level Calibration Data Note the calibration data in the following figure are examples only you should enter the actual calibration data provided inside the product package ...

Page 15: ...position 1 The accurate gain differences are provided in the sound level calibration data in the product package If the input gain is adjusted through the software the software will automatically take the change of the input gain into account However if the input gain is adjusted through the hardware gain switch you will have to change the Probe switch position see figure below accordingly in Mult...

Page 16: ... sign of the gain values in dB For example a gain of 3dB in a frequency response file should have a gain of 3dB in its equivalent frequency compensation file The microphone ECM999 in RTA 168A does not come with a calibration file and thus no frequency compensation is required The microphone EMM 6 in RTA 168B comes with an individually calibrated frequency compensation file RTA fcf This file is loc...

Page 17: ... EMM 6 s original calibration file without conversion To do that simply select Original Frequency Response File txt instead of Frequency Compensation File fcf as the file filter in the following file selection dialog box and then select the original calibration file The original calibration file can also be found in the CD directory Microphone Frequency Compensation File Its file name is something...

Page 18: ... default panel setting It is equivalent to the File New command 2 OCT1 1 1 Octave Analysis Avg 10 Pink noise will be generated by pressing the start button of the Signal Generator The pink noise will be injected into the DUT Device Under Test and the response of the DUT will be captured and analyzed by the Oscilloscope and Spectrum Analyzer A flat curve in the Spectrum Analyzer would indicate a fl...

Page 19: ...se of the DUT will be captured and analyzed by the Oscilloscope and Spectrum Analyzer All the above parameters of the DUT will be measured and displayed This panel setting should be used if different sound cards are used for signal input and output such as the case of RTA 168 It should also be used if the 1 kHz test tone is played from an audio CD or a memory stick 8 IMDsmp IMD SMPTE 60 Hz 7 kHz 4...

Page 20: ...ctrum Analyzer indicates the magnitude frequency response of the DUT Note that you will need to adjust the trigger level so that the Oscilloscope will be triggered just upon the start of the sweep 14 FRswLog Magnitude Frequency Response Frequency Sweep Log A 0 68266667 second 20Hz to 20kHz logarithmic frequency swept sine wave will be generated by pressing the start button of the Signal Generator ...

Page 21: ...lti Instrument Pro or above Please refer to Multi Instrument software manual for more details 1 9 List of Audio Test WAV Files AudioTestCD zip Track Description Length second Recommended Panel setting to be used 1 Pink Noise in Phase 1dBFS 298 OCT1 OCT24 OCT1spl OCT3spl 2 Pink Noise out of Phase 1dBFS 298 3 White Noise in Phase 1dBFS 298 FRwhite 4 White Noise out of Phase 1dBFS 298 5 Log Sweep 20H...

Page 22: ...Hz 1dBFS 60 1 3 Octave Band 12 49 200 Hz 1dBFS 60 1 3 Octave Band 13 50 250 Hz 1dBFS 60 1 3 Octave Band 14 51 315 Hz 1dBFS 60 1 3 Octave Band 15 52 400 Hz 1dBFS 60 1 3 Octave Band 16 53 500 Hz 1dBFS 60 1 3 Octave Band 17 54 630 Hz 1dBFS 60 1 3 Octave Band 18 55 800 Hz 1dBFS 60 1 3 Octave Band 19 56 1250 Hz 1dBFS 60 1 3 Octave Band 21 57 1600 Hz 1dBFS 60 1 3 Octave Band 22 58 2000 Hz 1dBFS 60 1 3 O...

Page 23: ...d You can change the number of frames for averaging by right clicking anywhere within the Spectrum Analyzer window and selecting Spectrum Analyzer Processing Inter Frame Processing Linear Average and choose a number in the Frames field You can change the frequency weighting by right clicking anywhere within the Spectrum Analyzer window and selecting Spectrum Analyzer Processing Intra Frame Process...

Page 24: ... 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 Requiremen...

Page 25: ...tive 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 21 0 193 0 mm Environmental Conditions Temperature 10 C 50 C Relative Humidity 0 95 RoHS Compliance Typical Polar Pattern Typical Frequency Response ...

Page 26: ... 200 between Pin 2 and Pin 3 Max SPL 1k 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 21 0 193 0 mm Environmental Conditions Temperature 10 C 50 C Relative Humidity 0 95 RoHS Compliance Calibration Individually calibrated Calibration file included Typ...

Page 27: ...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 Comp...

Page 28: ...r Derived Data Point Viewer Derived Data Curve and General Functions The add on modules include Spectrum 3D Plot Data Logger LCR Meter Device Test Plan Vibrometer and Dedicated Hardware Support There are six license levels to access the basic modules Sound Card Oscilloscope Sound Card Spectrum Analyzer Sound Card Signal Generator Multi Instrument Lite Multi Instrument Standard and Multi Instrument...

Page 29: ...ment kit License automatically activated with the presence of the corresponding hardware e g a USB hardkey or a VT DSO File Operation Load WAV File Load TXT File Load WAV File Frame by Frame fore Long WAV File Combine WAV Files Extract Data and save them into a new WAV File Save Load Panel Setting Data Export Copy Text to Clipboard Copy BMP to Clipboard Print Preview Print Export as TXT File Expor...

Page 30: ...ode Reference Curves Limits Others Gain Adjustment Input Peak Indicator Sound Card Selection Sampling Parameter Auto Setting Multilingual GUIs Show Hide Toolbar Lock Unlock Panel Setting Hot Panel Setting Toolbar ActiveX Automation Server AutoRanging AutoScaling Input Channel Operation Oscilloscope Type Individual Waveform offline Waveform Addition offline Waveform Subtraction offline Waveform Mul...

Page 31: ...Pass FIR Band Pass FIR Band Stop FIR Frequency Response IIR Coefficients Parameter Measureme nt Reverberation Speech Intelligibility Discontinuity Step Response Others Max Min Mean RMS offline Record Mode Persistence Display Mode Equivalent Time Sampling Mode Analog Digital Signal Mixed Display SINC Interpolation Spectrum Analyzer Type Amplitude Spectrum Power Spectrum Density Impedance Spectrum P...

Page 32: ...HD THD N SNR SINAD Noise Level ENOB IMD DIM Bandwidth Crosstalk Harmonics Phase Energy in User Defined Frequency Band Peak Detection SFDR TD N Wow Flutter Sound Loudness Sound Loudness Level Sound Sharpness Total Non Coherent Distortion Noise GedLee Metric FFT FFT Size 128 32768 FFT Size 65536 4194304 Intra Frame Average Window function Window Overlap Others Octave Analysis 1 1 1 3 1 6 1 12 1 24 1...

Page 33: ...og Amplitude Sweep Linear Log Forward Reverse Sweep Burst Mask Normal Phase Locked Phase Window Shaped Burst On Off Amplitude Ratio Fade Fade In Fade Out Modulation AM FM PM Others Software Loopback all channels Software Loopback 1 channel Sync with Oscilloscope Save as WAV file Save as TXT file DDS DC Offset Multimeter Type RMS dBV dBu dB dB A dB B dB C Frequency Counter RPM Counter Duty Cycle Fr...

Page 34: ...d Alarm Acknowledge Inter frame Linear Exponential Average DDP Array Viewer Harmonic Frequencies RMS Phases Report Octave Bands RMS Report Peak Frequencies RMS Phases Report Frequency Bands RMS Report Reverberation Speech Intelligibility Report 1 1 Octave Reverberation Speech Intelligibility 1 3 Octave Derived Data Curve DDC Function Energy Time Curve Log Squared Energy Time Curve Envelop Energy T...

Page 35: ...trogram Color Palette Waterfall Color Palette Waterfall Tilt Angle Waterfall Spectrogram Height Linear Log Scale for X and Y Number of Spectral Profiles 10 200 Others 3D Cursor Reader Octave Analysis 1 1 1 3 1 6 1 12 1 24 1 48 1 96 Spectrogram Smoothing Data Logger Real Time Logging Load Historical Log File Three logging methods Fastest Time Interval Update Threshold 246 derived data points availa...

Page 36: ... Analyzer Sound Card Signal Generator Multi Instrument Lite Multi Instrument Multi Instrument Pro Variables Vibrometer RMS Peak PP Crest Factor for acceleration velocity displacement in Multimeter Waveform conversion among acceleration velocity and displacement in Oscilloscope SI English units Dedicated Hardware Support RTX6001 Remote Local Control ...

Page 37: ...unless the software is activated by a softkey activation code which is NOT included in the standard VT RTA 168 package and should be purchased separately as a brand new license if needed 3 2 License Upgrade from One Level to Another You can purchase an upgrade of the license e g from Multi instrument Standard to Multi Instrument Pro Data Logger at any time if necessary After you purchase the upgra...

Page 38: ...logy on all questions relating to complaints as to defects either of workmanship or materials shall be deemed conclusive and the buyer shall agree to abide by such decisions 5 Disclaimer This document has been carefully prepared and checked No responsibility can be assumed for inaccuracies Virtins Technology reserves the right to make changes without prior notice to any products herein to improve ...

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