Features
& Capabilities
• Precision Wide Range Constant Duty
Cycle
• Wide operating flash rate 0Hz - 10kHz
• Fine Frequency Resolution of 0.01Hz
• SuperFlux High Power White LED
• Collimating Lens with 45° Beam Width
• Long Flash LED Lifetime 50K - 100K
Hours
• Wide Range Sync Capability 0.5V - 300V
• Fully Programmable via RS-232
• Four (4) Operating Modes
• Four (4) Parameter Display Modes
• 6 Digit 7-Segment Numeric Display
• Backlit Status Indicators
• Win32 Application Software
• High Capacity Lithium Ion Battery
• Portable Hand Held Battery Operated
• Small & Lightweight Flashlight Size
Chassis
• Built-in Universal Charger 85VAC-265VAC
Precision
High Speed Stroboscope
The LS310
is a portable battery operated hand-held instrument roughly the same size
as a flashlight. Shaped as an octagon, it is 2 inches across and 7 inches
long weighing less than one pound. The LS310 utilizes a rechargeable Lithium
Ion battery and features a universal 85-265VAC built-in charger.
The LS310 utilizes the latest in high power LED technology with a 7 Watt
SuperFlux high efficiency multi LED and collimating lens. The intensity
is very bright with each flash producing nearly 200 lumens of white light.
A strobe based on LED technology has several important advantages over traditional
Xeon based strobes: (1) Flash duration can be programmed and controlled
precisely over an extremely large range from seconds down to sub-micro seconds,
(2) the life of the LED is virtually unlimited, (3) programmable flash intensity,
and (4) lower cost low voltage drive circuitry. The highly controllable
LED flash duration enables constant duty cycle operation vs. frequency which
is virtually impossible for Xeon based strobes.
The LS310 offers a comprehensive array of features to examine surface vibrations
of transducer diaphragms, among other general purpose strobe applications.
A stroboscope allows a moving or vibrating object to be viewed as if it
was stationary. By flashing a short burst of light at the same time during
each periodic vibration of the driver, the diaphragm appears stationary.
This allows changes in the surface to be observed at any frequency of interest.
While
common acoustic frequency response testing of drivers can quickly
show peaks, nulls, or resonances in the response, it does not indicate
the source of the problem. A stroboscope can be invaluable for this
purpose often showing exactly the mechanical cause of the response
defect.
Typically the driver is swept using a sine wave stimulus across a
frequency range. The stroboscope is synchronized to the same signal,
flashing at exactly the same frequency and at the same phase of each
period.
A variety of motional problems can be quickly observed including:
resonance deformations in the surround, resonance modes in the spider,
flexing of dust caps, improper or loose glue seams, standing waves
in lead wires, and rocking motions of the cone.
Example-1:
450mm Woofer
This
example demonstrates a spider problem in a 450mm woofer. The Impedance
graph below shows a resonance at 220Hz. While impedance data is
very helpful in identifying resonance problems, it does not indicate
the cause of the problem.
The video clip shown here displays the spider region while driven
at 220Hz and illuminated in sync by the LS310 strobe. In this case
the resonance is not cone breakup related, but rather due to a spider
resonance behavior.
Video clip courtesy
of Quint-Audio, Germany
Note: Windows Media Player 9 or higher required
Example-2:
50mm Midrange
This
example demonstrates a cone and/or suspension problem in a 50mm
midrange. The Impedance graph below shows a resonance at 2000Hz.
While impedance data is very helpful in identifying resonance problems,
it does not indicate the cause of the problem.
The
video clip shown here displays the cone region while driven at 2000Hz
and illuminated in sync by the LS310 strobe. In this case the resonance
is caused by a rocking motion of the cone assembly.
Video clip courtesy of Quint-Audio, Germany
Note:
Windows Media Player 9 or higher required
Example-3:
200mm Midrange
This
example demonstrates a cone flexing/ stiffness problem in a 200mm
woofer. The Impedance graph below fails to show any particular resonance
issue itself. However strobe testing on the cone demonstrates a
significant bending motion across the cone at 290Hz.
The
video clip shown here displays the cone region while driven at 290Hz
and illuminated in sync by the LS310 strobe. In this case the resonance
is a bending/warble motion seen at the edge of the cone assembly.
Video clip courtesy of Quint-Audio, Germany
Note:
Windows Media Player 9 or higher required
