1.
Package Contents 1) Hydrophone with a built-in preamp
and an integrated XLR cable 2) XLR-to-USB
Converter 3) USB cable (2.0 m) 4) CD (contains the copy-protected
Multi-Instrument Software) 5)
USB hardkey (contains a Multi-Instrument Pro License) 6) Carrying
Case
2. VT USA-168A/B Series
Hardware Configuration
USA-168A
USA-168B
Hydrophone with a Built-in Preamp
Default Cable Length: 9 m
Default Cable Length: 6 m
XLR-to-USB
Converter
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.
3.
Overall VT USA-168 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
1
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 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.
4. 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)
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)
5.
XLR-to-USB Converter Specifications
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
