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VT USA-168A/B Real Time Underwater Sound Analyzer Manual Rev. 1.5

Virtins Technology

Sound Card
Oscilloscope

Sound
Card
Spectrum
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

Summary of Contents for VT USA-168A

Page 1: ...ns com 1 Copyright 2021 2022 Virtins Technology Virtins Technology VT USA 168A B Real Time Underwater Sound Analyzer Manual 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: ...a Hardware Gain Knob 15 1 5 3 0dB Reference Vr 15 1 6 MOST FREQUENTLY USED MEASUREMENT SETTINGS 16 1 7 USING HYDROPHONE WITH BATTERIES OR AN EXTERNAL POWER SUPPLY WITHOUT A COMPUTER 16 1 8 HYDROPHONE MAINTENANCE 17 1 9 SLIDING STAINLESS STEEL WEIGHT ON VT USA 168B 17 1 10 USING VT USA 168A AS A CONTACT MIC ANALYZER IN AIR 17 1 11 CONNECTING HYDROPHONES TO 3 5MM TRS MIC INPUT OF OTHER AUDIO DEVICES...

Page 3: ...A it has a smaller size and much lower specific gravity and thus can be inserted into pipes and other tight spaces making it excellent for leak finding Its low mass and full polyurethane rubber encapsulant make it highly resistant to damage caused by impact To maintaining negative buoyancy underwater it is assembled with a 150g sliding stainless steel weight on the cable Though designed primarily ...

Page 4: ...nology 3 USB 2 0 Cable 1 5m 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 Pro license 6 Carrying Case 1 2 Hardware Connection Connect the hydrophone to the Mic Hi Z jack of the XLR to USB sound card ...

Page 5: ...be plugged into any USB port of the PC in order to activate the Multi Instrument software Otherwise the software will run under the 21 day fully functional free trial mode before the trial period expires 1 3 Hardware Driver Installation The device driver installer USA168_DriverInstaller exe is located in the Drivers VTUSA168 directory in the CD When you install the Multi Instrument software a copy...

Page 6: ...oscope Spectrum Analyzer 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 St...

Page 7: ...ing 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 In case the driver has not yet been installed the software will prompt the user to instal...

Page 8: ...PDF format or VIRTINS Multi Instrument Help 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 but...

Page 9: ...nfigure the XLR to USB sound card as the sound recording device for the software Now if you start the oscilloscope by pressing the red button at the upper left corner of the screen and then talk LOUDLY before the hydrophone you should be able to see your voices in the Oscilloscope and Spectrum Analyzer 1 4 3 1 2 Using MME Driver Go to Setting ADC Device and select Sound Card MME in the Device Mode...

Page 10: ...can avoid these problems It should also be noted that when MME driver is used the actual sampling rate is determined by the sampling rate configured in the Sound Recording Control Panel see figure below If the sampling rate selected in Multi Instrument differs from the actual one then sampling rate conversion will be performed automatically by Windows and this will alter the original data unwanted...

Page 11: ...ins Technology Now if you press the Signal Generator button the Signal Generator panel will be opened Press the red 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 ...

Page 12: ...te underwater sound level measurement please check our other products instead However Multi Instrument will still show the measured underwater sound level based on the nominal sensitivity of the hydrophone and the gain of the XLR to USB sound card Please consider the value as indicative only Sound level calibration data can be entered viewed via Setting Calibration in Multi Instrument see highligh...

Page 13: ... 11 Input of the Sound Level Calibration Data The following calibration data will be filled automatically after VT USA 168A is selected as the default device when the software is launched for the very first time or via Setting Restore to Factory Default VT USA 168A The following figure shows the calibration data for VT USA 168B The difference is only at 0dB reference Vr ...

Page 14: ...Underwater Sound Analyzer Manual Rev 1 5 www virtins com 14 Copyright 2021 2022 Virtins Technology Virtins Technology VT USA 168B Clicking the button in the above figures will show additional calibration data for the gain knob ...

Page 15: ...Multi Instrument s toolbar If the CLIP SIG LED lights up red reduce the gain 1 5 3 0dB Reference Vr The 0dB Reference Vr in the Calibration Setting dialog box is used to finally calibrate the input voltage to dBSPL The input voltage here should be considered as a relative value as the actual input is not a voltage but a sound pressure The 0dB Reference Vr is the parameter to be recalibrated if a s...

Page 16: ... e 0 001585 V Pa The nominal sensitivity of the old version of VT USA 168A is 180dB i e 0 001 V Pa The nominal sensitivity of the old version of VT USA 168B is 192dB i e 0 0002512 V Pa 1 6 Most Frequently Used Measurement Settings Multi Instrument bundled with VT USA 168A B comes with many pre configured panel setting files This saves you time to configure various parameters for some frequently pe...

Page 17: ...phone in long term installations 1 9 Sliding Stainless Steel Weight on VT USA 168B To maintaining negative buoyancy underwater the hydrophone VT USA 168B is assembled with a 150g sliding stainless steel weight There are several advantages to placing the weight on the cable rather than building it into the hydrophone When the hydrophone is dropped the cable flexes and absorbs any stress from impact...

Page 18: ...her Audio Devices It is possible to connect the hydrophones of VT USA 168A B to the 3 5mm TRS mic input of other audio devices using a XLR to 3 5mm TRS adapter shown below The adapter needs to be purchased separately It will allow you to use the hydrophone with any preamp designed to work with electret condenser microphones i e with plug in power The 3 5mm plug is wired for dual mono output which ...

Page 19: ...Leq fully complies with IEC61672 Octave Analysis 1 1 1 3 1 6 1 12 1 24 1 48 1 96 Complies with IEC61260 Other Functions Much more functions are described in the software manual USB interface USB 2 0 driver installation required Input Isolation No Isolation can be achieved through a USB high speed isolator Power Source USB bus power Type B DC 5V power supply Micro B or 2 AA batteries Power Consumpt...

Page 20: ...r XLR TS combo jack Full Scale Input Voltage Range Mic 0 006V 0 9V Hi Z 0 005V 3 5V Adjustable through the GAIN knob Input Impedance Mic 1 8kΩ unbalanced 3 6kΩ balanced Hi Z 484kΩ Analog Line In Connector ϕ3 5mm stereo jack Full Scale Input Voltage Range 1 2V Input Impedance 22kΩ Analog Output L R Connector RCA coaxial Full Scale Output Voltage Range 0 02V 0 9V adjustable through the OUTPUT knob O...

Page 21: ...B Real Time Underwater Sound Analyzer Manual Rev 1 5 www virtins com 21 Copyright 2021 2022 Virtins Technology Virtins Technology Typical THD THD N SNR with Gain Knob at 0 Typical THD THD N SNR with Gain Knob at 10 ...

Page 22: ... Sampling Rate 96kHz 2 4 Multi Instrument Software Specifications A complete Multi Instrument software package consists of basic and add on modules with all features in each of them The basic modules include Oscilloscope Spectrum Analyzer Signal Generator Multimeter Derived Data Point Viewer Derived Data Curve and General Functions The add on modules include Spectrum 3D Plot Data Logger LCR Meter ...

Page 23: ...ti Instrument Full Package only Sound Card Oscilloscope Sound Card Spectrum Analyzer Sound Card Signal Generator Multi Instrument Lite Multi Instrument Standard Multi Instrument Pro General Functions ADC DAC Hardware Sound Card MME Sound Card ASIO Other Hardware vtDAQ vtDAO software development kit License automatically activated with the presence of the corresponding hardware e g a USB hardkey or...

Page 24: ...rker Chart Type Line Width Color Fast Slow Display Mode Refresh Delay Font Size Roll Mode 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 Individua...

Page 25: ...s FFT Band Pass FFT Band Stop FFT Frequency Response FIR Low Pass FIR High Pass FIR Band Pass FIR Band Stop FIR Frequency Response IIR Coefficients Parameter Measurement Reverberation Speech Intelligibility Discontinuity Step Response Echo Damping Ratio Others Max Min Mean RMS offline Record Mode Persistence Display Mode Equivalent Time Sampling Mode Analog Digital Signal Mixed Display SINC Interp...

Page 26: ...ge Linear Octave Inter Frame Processing Peak Hold Linear Average Exponential Average Parameter Measurement THD 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 Sound Articulation Index Total Non Coherent Distortion Noise GedLee Metric FFT FFT Si...

Page 27: ...usical Scale Wave File Play Waveform in Oscilloscope Cyclic Play Waveform in Oscilloscope Sweep Frequency Sweep Linear Log 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 ...

Page 28: ...play HH H L LL Alarm Set Display Precision Define UDDP Alarm Sound 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...

Page 29: ... CSD Settings Spectrogram 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 262 derived ...

Page 30: ...ound Card Spectrum 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 31: ...d by a softkey activation code which is NOT included in the standard VT USA 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 upgrade a small upgrade package file...

Page 32: ...ng 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 functionality reliability or...

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