Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Chirp/FM Pulse for Underwater Acoustic Systems

BII-4040 is a gated chirp signal generator (Frequency Modulated Pulse) in which the frequency increases (up-chirp) linearly with time.

Chirp/FM Pulse

Suggested Application  
Active SONAR System
Seafloor Mapping, Echo Sounding
Underwater Communication
Artificial Acoustic Target, Phantom Echo Generation
SINE Reference Signal for Demodulator/Quadrature Sampling
Sub-Bottom Investigation/Assessment/Profiler
Sediment Profiling, Sediment Penetrating
Detection Buried Objects Search, Pipeline/Cable Survey
Navigation/Fishery Acoustics/Physical Oceanography
Marine Animal Acoustics, Acoustic Behavior Research
Ultrasonic Instrumentation, HIFU System
High Output Current: 250mA
Frequency Range: 0.5kHz to 3MHz
Pulse Width/Period Selectable
Pulse Width: 10μs to 100ms
Pulse Period: 1.024ms to 8hrs
High Accuracy and Stability
Factory-set Parameters
Bolts for Easy Mounting, PCB and Potted Unit
Customized Signals
Note: pps is pulse per second.  Pulse Period = 1/Pulse Repetition
Model Signal Type  Frequency Pulse Width Pulse Repetition Chirp Spectrum
BII-4040 Chirp/FM Pulse
Up-chirp Linearly
0.5kHz to 1MHz 10μs to 100ms ≥ 0.000035pps Chirp Signal
Frequency Accuracy: ±0.25% typical; ±0.5% Maximum, @25°C
Frequency Stability: ±0.005%/°C, ref@25°C
Aging/Long-Term Stability: ±150 ppm/√kHr, @25°C
Analog Output Level: 1. Default: 5 Vpp
2. Custom: 1Vpp to 20Vpp
Maximum Output Current: 250 mA
Cable Drive Capability: 100m
Quiescent Supply Current: 4mA
Supply Voltage: +6 to +30 VDC
Suggested DC Supply: +9VDC Batteries, Marine Battery, Automobile Battery, Fixed DC Linear Power Supply, Not Included.
DO NOT use variable power supply whose maximum supply voltage is higher than the above rated voltage.
DO NOT use switching mode DC power supply.
Wiring for Signal 0.15m Wires
Wiring for Power Supply:  0.15m Wires
Connector:  Wire leads
Mounting: Two Φ2.54mm thru-hole on PCB for mounting.
Coated PCB Size (mm): ΦDxH = 50.8x9.0mm
Operating Temperature: -40°C to +85°C
Storage Temperature: -50°C to +105°C
How to order BII-4010:
Please specify start and stop frequency (kHz), pulse width (PW, ms: millisecond) and pulse repetition (PR, pps: pulses per second) when ordering. These parameters are factory-set and calibrated at 25°C, not adjustable/trimmable.
BII-4040 -xxx -xxx -xxx -xxx -xxx
Chirp Pulse Start Frequency
in kHz
Stop Frequency
in kHz
in mS
in PPS
Analog Output Voltage Level
in Vpp
Example: Description:
BII-4040-3-4-20-0.5: BII-4040, Chirp Pulse, start f=3kHz; stop f=4kHz; pulse width PW=20ms; Pulse Repetition PR=0.5pps; Output Voltage 5Vpp.
BII-4040-190-210-1-0.5-20: BII-4040, Chirp Pulse, start f=190kHz; stop f=210kHz; pulse width PW=1ms; Pulse Repetition PR=0.5pps; Output Voltage 20Vpp.

BII-4040 Wiring

Cable/Wire Electrical Signal
Red +VDC
Black Common
White Signal Output

Sonar SignalSonar Signal

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