Virtins technology Vt usa-168a User manual

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

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.

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

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TABLE OF CONTENTS

1 INSTALLATION AND QUICK START GUIDE..........................................................................................3

1.1 PACKAGE CONTENTS....................................................................................................................................3

1.2 HARDWARE CONNECTION ............................................................................................................................4

1.3 HARDWARE DRIVER INSTALLATION.............................................................................................................5

1.4 MULTI-INSTRUMENT SOFTWARE INSTALLATION AND CONFIGURATION.......................................................6

1.4.1 Install Multi-Instrument.......................................................................................................................6

1.4.2 Start Multi-Instrument..........................................................................................................................6

1.4.3 Configure Multi-Instrument.................................................................................................................8

1.5 INPUT OF SOUND LEVEL CALIBRATION DATA AND ADJUSTMENT OF INPUT GAIN......................................12

1.5.1 Under Windows 8/8.1/10/11 ..............................................................................................................13

1.5.2 Adjustment of Input Gain via 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

1.8HYDROPHONE MAINTENANCE....................................................................................................................17

1.9SLIDING 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..............................18

2 SPECIFICATIONS.........................................................................................................................................19

2.1 VT USA-168A/B OVERALL HARDWARE SPECIFICATIONS.........................................................................19

2.2HYDROPHONE SPECIFICATIONS ..................................................................................................................19

2.3 XLR-TO-USB SOUND CARD ......................................................................................................................20

2.4MULTI-INSTRUMENT SOFTWARE SPECIFICATIONS......................................................................................22

3 MULTI-INSTRUMENT SOFTWARE LICENSE INFORMATION ........................................................31

3.1 LICENSE TYPES...........................................................................................................................................31

3.2 LICENSE UPGRADE FROM ONE LEVEL TO ANOTHER...................................................................................31

3.3 SOFTWARE UPGRADE IN THE SAME LICENSE LEVEL...................................................................................31

4 WARRANTY...................................................................................................................................................31

5 DISCLAIMER.................................................................................................................................................32

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1 Installation and Quick Start Guide

Both VT USA-168A and VT USA-168B are high-sensitivity low-noise real-time underwater

sound analyzers in the human auditory range. They are equipped with high-sensitivity

hydrophones with built-in preamps and XLR output connectors, which are compatible with

the common phantom powered XLR interface. The hydrophones can withstand a static water

pressure up to 80m and drive a cable up to 250 m with negligible signal degradation.

The hydrophone of VT USA-168A is rugged and compact. Its small, streamlined shape and

high specific gravity will help maintain a low working depth in mild wind and currents. Its

compact size and flexible cable make it very portable and simple to use.

The hydrophone of VT USA-168B uses a unique high-sensitivity, dual-sensor, mechanically-

balanced transducer assembly that offers exceptional signal-to-noise performance. Compared

with the hydrophone of VT USA-168A, 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 for

underwater listening and leak finding, it is also useful as a waterproof microphone for tool

room applications, such as monitoring cutting in waterjet and other CNC tooling.

Both VT USA-168A and VT USA-168B have not been individually calibrated although the

nominal values are provided, their use in absolute sound level measurement is thus not

recommended (Please check our other products instead).

1.1 Package Contents

A standard VT USA-168A/B Package contains the following items:

1) Hydrophone with a built-in preamp and integrated XLR cable

(USA-168B)

(USA-168A) or (USA-168B)

(default cable length: 9 m) (default cable length: 6 m)

Note: USA-168A has a thread-mount version of hydrophone on request. 1/4" NPT (National Pipe Thread) with

7/16" (12mm) wrench flats. Standard configuration includes 1/2-meter cable with stripped and tinned wire

termination.

2) XLR-to-USB Sound Card

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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.

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Then connect the XLR-to-USB sound card to the PC’s USB port using the supplied USB

cable.

Switch the POWER SOURCE to USB. The red POWER LED should light up indicating that

it is receiving power. Then switch on the 48V phantom power to supply power to the built-in

preamp of the hydrophone.

The USB hardkey needs to 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 of the device

driver installer will also be installed in the software installation

directory\Drivers\VTUSA168. Run it to install the driver. After driver installation, the

device will be supported by both sound card MME and ASIO drivers in Multi-Instrument.

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1.4 Multi-Instrument Software Installation and Configuration

Multi-Instrument is a powerful multi-function virtual instrument software. It supports a

variety of hardware ranging from sound cards which are available in almost all computers to

proprietary ADC and DAC hardware such as NI DAQmx cards, VT DSOs and so on. It

consists of multiple test instruments such Oscilloscope, 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 [Start]>[All Programs]>[Multi-

Instrument]>[VIRTINS Multi-Instrument], or simply double click the MI icon.

If the software is started for the very first time after installation, it will prompt the user to

select a default device (see figure below). Select VT USA-168A or VT USA-168B according

to the hardware device to be used.

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The default device can also be changed later via [Setting]>[ADC Device], [Setting]>[DAC

Device], and [Setting]>[Configure Hot Panel Setting Toolbar], or simply [Setting]>[Restore

to Factory Default]. However, if [Restore to Factory Default] command is executed, 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.

In case the driver has not yet been installed, the software will prompt the user to install the

driver. Restarting program is required after that.

After the default device is selected, the software will prompt the user to select a default color

scheme (Skin). The default skin can also be changed later via [Setting]>[Display].

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The main window of the software will open after the above skin selection. The following

figure shows a typical screen layout (obtained by clicking the “OCT3” button in the Hot

Panel Setting Toolbar after the launch of the software). Please refer to the software manual

for detailed functions of the software. The software manual can be accessed via [Start]>[All

Programs]>[Multi-Instrument]>[VIRTINS Multi-Instrument Manual] (in 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 button at the upper left corner

of the screen (see figure below). The button will turn red once the Oscilloscope is stopped.

1.4.3.1 Configure Sound Recording Devices for Multi-Instrument

The XLR-to-USB sound card can be used with either MME or ASIO driver. ASIO driver is

recommended as it uses the sampling rate selected in Multi-Instrument directly and bypasses

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the possible sampling rate conversion and audio signal enhancement by Windows, which

may otherwise alter the original samples and lead to measurement inaccuracies.

1.4.3.1.1 Using ASIO Driver

Go to [Setting]>[ADC Device], and select “Sound Card ASIO”in the “Device Model”field.

Then choose “Zoom U-22 ASIO Driver” in the “Device No.” field (see figure below). This

is to configure 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 Model”field.

Then choose “Line (ZOOM U-22 Audio)” in the “Device No.” field (see figure below). This

is to configure the XLR-to-USB sound card as the sound recording device for the software.

Note that the displayed name of the sound card may vary a bit under different Windows

versions or with different USB ports.

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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.

Some Windows versions / editions come with some audio signal enhancement features which

are enabled by default. These features must be disabled through the Sound Recording Control

under Windows Control Panel to prevent them from altering the originally sampled data, as

shown below. One of the possible problems caused by these features is the unwanted

alteration of the frequency response of the setup. Using ASIO driver instead of MME driver

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 unwantedly.

1.4.3.2 Configure Sound Playback Devices for Multi-Instrument

The Signal Generator of Multi-Instrument can be used for sound playback and generation.

You can use it to playback a recorded underwater sound, or generate an underwater test

sound if you have an underwater sound emitter attached. To configure the sound card for the

Signal Generator, go to [Setting]>[DAC Device]. Either “Sound Card MME” or “Sound

Card ASIO” can be chosen in the “Device Model” field. Choose the corresponding sound

card’s name in the “Device No.” field. By default, the XLR-to-USB sound card with its

ASIO driver is selected for signal output.

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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.

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1.5 Input of Sound Level Calibration Data and Adjustment of Input Gain

Both the hydrophone and XLR-to-USB sound card are not calibrated individually. The

combined setup is not calibrated individually either. Therefore VT USA-168A and VT

USA-168B are not recommended for absolute 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 highlighted fields in the figure below). Note that different calibration data

may be required for different Windows versions.

You can adjust the sound level measurement range by turning the gain knob of the XLR-to-

USB sound card.

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1.5.1 Under Windows 8/8.1/10/11

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.

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VT USA-168B

Clicking the button “…” in the above figures will show additional calibration data for the

gain knob.

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Adjustment of Input Digital Gain

Only when MME driver is used, the input digital gain can be adjusted by clicking the

respective radio buttons beside the “Line In 100%”, “Line In 80%”, “Line In 60%”, “Line In

40%” and “Line In 20%” in the above figures. It should be generally kept at “Line In 100%”.

These input digital gain settings have no impact when ASIO driver is used.

1.5.2 Adjustment of Input Gain via Hardware Gain Knob

You can adjust the input gain by turning the gain knob on the XLR-to-USB sound card (see

figure above). To account for this gain adjustment, you will have to update the “Probe”

switch position (see figure below) accordingly in 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 sound level recalibration is necessary. To do the

recalibration, simply enter the actual sound level value into the “Actual Value”edit box and

the measured sound level value into the “Read Value”edit box, and then press the

“Calculate”button once. It should be noted that the Sensor Sensitivity is kept at 1V/V in his

method.

In case you want to display the measured raw data in Pa rather than Volt, then you should

enter the “actual”Sensor Sensitivity in V/Pa, which can be calculated using the following

formula:

Sensitivity = [“0dB Reference Vr”(in Volt)] / [Standard 0dB Reference (in Pa)]

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where the Standard 0dB Reference for sound pressure level in air is 20 µPa (i.e. 2e-005 Pa)

and that in water is 1 µPa (i.e. 1e-006 Pa). If the actual sensor sensitivity is used, then the

standard 0dB reference should be entered into the “0dB Reference Vr”edit box. For

example, the following two methods are equivalent.

VT USA-168A

Method 1: [0dB Reference Vr] = 5.623e-009 (V) and [Sensor Sensitivity] = 1 V/V

Method 2: [0dB Reference Vr] = 1e-006 (Pa) and [Sensor Sensitivity] = 0.005623 V/Pa

VT USA-168B

Method 1: [0dB Reference Vr] = 1.585e-009 (V) and [Sensor Sensitivity] = 1 V/V

Method 2: [0dB Reference Vr] = 1e-006 (Pa) and [Sensor Sensitivity] = 0.001585 V/Pa

The sensitivity of a hydrophone is usually specified in dB with reference to 1V/μPa, it can be

converted to V/Pa as follows:

Sensitivity (V/Pa) = power (10, Sensitivity (dB)/20) × 106

For example, the nominal sensitivity of the hydrophone in VT USA-168A is -165dB, i.e.

0.005623 V/Pa. The nominal sensitivity of the hydrophone in VT USA-168B is -176dB, i.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

performed measurements by yourself. You can load these panel setting files via

[Setting]>[Load Panel Setting]. Furthermore, up to 20 most frequently used panel setting

files can be configured in the Hot Panel Setting Toolbar (The third toolbar from the top) via

[Setting]>[Configure Hot Panel Setting Toolbar]. You can load one of them by a single

mouse click. Two panel setting files are preconfigured in this toolbar. They are:

(1) Home: Default Setting

The factory default panel setting. It is equivalent to the [File]>[New] command.

(2) OCT3: 1/3 Octave Analysis

1/3 octave band spectrum analysis instead of narrow band FFT spectrum analysis will be

perform on the sampled data.

1.7 Using Hydrophone with Batteries or an External Power Supply without

a Computer

The XLR-to-USB sound card can be powered by two HR6 (1.2V) or LR6 (1.5V) AA size

batteries, or an external 5V DC power supply (e.g. a mobile USB battery) if the “POWER

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SOURCE”switch is set to “BATTERY / DC IN (TABLET)”.The underwater sound

captured by the hydrophone can be directly monitored from the “PHONES”jack if the

“DIRECT MONITOR”switch is set to “ON”even without a computer.

1.8 Hydrophone Maintenance

No special care is required for the hydrophone. It is designed to withstand corrosion from

seawater and the impact of accidental drops. Although it is quite tough for what it is, but note

that it is a sensitive instrument. Avoid throwing it into the water, or any other activity that

may result with an impact to the hydrophone. Try to keep the output plug clean and dry and

avoid unnecessarily rough handling to ensure the long-term stability of the product. It is best

NOT to store the hydrophone in a waterproof enclosure. Doing so will trap moisture, salts

and minerals that are left on the hydrophone and cable after deployment and prematurely

corrode the output plug. Making an extra effort to coil the cable neatly when retrieving the

hydrophone will help avoid problems with tangles as the cable ages. Most importantly,

protect the cable from cuts and abrasions! The hydrophone uses a custom-made cable with a

very durable PU jacket. However, it is also designed to be compact and flexible. Kinking the

cable, walking on it, or dragging it over a sharp or abrasive surface may damage the cable

sheath and eventually cause the hydrophone to fail. Both aquatic and terrestrial animals may

attack the cable in an unattended application. Using some kind of cable conduit, such as

plastic tubing, can help to protect the hydrophone 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, making the hydrophone more durable.

The weight can be moved if need to allow insertion into a pipe. Both of these attributes are

especially useful to the leak finding specialist. Moving the weight away from the hydrophone

dampens acceleration noise that is transmitted down the cable from handling and it also

minimizes response irregularities caused by material resonances and sound reflections. It can

also be used for mounting a shroud tube to minimize flow noise over the hydrophone. To

move the weight, turn the black plastic thumbscrew counter-clockwise to loosen the internal

rubber compression sleeve and slide the weight where needed. Wet the cable if this is

difficult. Secure again by turning the thumbscrew clockwise. Be Advised: Finger-tighten

thumbscrew only and always leave a minimum spacing of 5 cm between hydrophone

and weight!

1.10 Using VT USA-168A as a Contact Mic Analyzer in Air

A contact mic adapter (see picture below) can be purchased separately to convert the VT

USA-168A into a contact mic analyzer in air. The adapter is made from the same

acoustically-transparent rubber used to encapsulate the transducer assembly of the

hydrophone. The inside is molded to the same size as the hydrophone. Simply place the

hydrophone inside, bed with water for maximum efficiency, and set the flat surface of the

cup on the media to which you want to listen. This will create a very sensitive contact

microphone, outperforming most contact mics at very low frequencies. It can be used for

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sound effects, leak detection, surveillance, terrestrial studies, sporting events, or general

phonography.

1.11 Connecting Hydrophones to 3.5mm TRS Mic Input of Other 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 will drive both left and right stereo channels and

is also compatible with mono computer sound cards.

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2 Specifications

2.1 VT USA-168A/B Overall Hardware Specifications

USA-168A

USA-168B

Frequency Range

20Hz ~ 4kHz (± 4dB)

20Hz ~ 10kHz (± 5dB)

Sound Level Measurement

Range

48dB ~ 161dB (typical)

(Old Version: 63dB ~176dB)

59dB ~ 172dB (typical)

(Old Version: 75dB ~ 188dB)

Useful Frequency Range

(<10Hz) ~ (>100kHz)

(Sensitivity drops about 45dB

@100kHz)

(<10Hz) ~ (>100kHz)

(Sensitivity drops about 44dB

@100kHz)

Operating Depth

< 80m

Sampling Rate

44.1kHz, 48kHz, 88.2kHz, 96kHz

Bit Depth

24 bit

Number of Input Channel

Direct Monitoring without

Passing Through

Computer

Supported

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)

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 Consumption

Max. 5W

System Requirements

Windows 8/8.1/10/11, 32 bit or 64 bit.

Minimum Screen Resolution: 1024 × 600

Calibration

Not calibrated individually. Nominal value is used instead. Not

recommended for absolute sound level measurement.

2.2 Hydrophone Specifications

USA-168A

USA-168B

Transducer Type

Plate bender

Dual plate benders,

mechanically balanced

Frequency Range

20Hz ~ 4kHz (± 4dB)

20Hz ~ 10kHz (± 5dB)

Sensitivity

-165dB re: 1 V/μPa (Typical)

(Old Version: -180dB)

-176dB re: 1 V/μPa (Typical)

(Old Version: -192dB)

Useful Frequency Range

(<10Hz) ~ (>100kHz)

(Sensitivity drops about

45dB @100kHz)

(<10Hz) ~ (>100kHz)

(Sensitivity drops about

44dB @100kHz)

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Size

ϕ25mm × 46mm

ϕ17mm × 32mm

Weight

105g

10g

Specific Gravity

5.3

1.3

Added Weight

Not required

150g

With Built-In Preamp

Yes

Polar Response

Omnidirectional (horizontal)

Connector

XLR (pin 1: ground, pin 2: hot, pin 3: unused)

Power Supply

48V Phantom

Power Consumption

1.2 mA (Typical)

2.3 XLR-to-USB Sound Card

Mic/Hi-Z

Connector

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

Output Impedance

1kΩ

Phones

Connector

ϕ3.5mm stereo jack

Full-Scale Output Voltage Range

±0.01V ~ ±1.8V, adjustable through the OUTPUT knob

Output Impedance

10Ω

Other Specifications

Frequency Response

10Hz~40kHz, ±2dB

Size

119.2 mm (L) x 91.8 mm (W) x 44.6 mm (H)

Weight

151g

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