This portable instrument measures sonic propagation time in wood structures such as living trees, waterfront structures, panel products, and poles.
Digital readout indicates stress wave propagation time from 1 to 9999 microseconds with a resolution of 1 microsecond. Controls: Dual gain control switches and internal sensitivity controls for the start and stop channels.
in excess of 40 hours
9 x 6 x 8 in (230 x 150 x 200 mm) (L x W x H)
5 lb (2.3 kg)
L x W x H
33 x 12 x 12 in (838 x 305 x 305 mm)
35 lb (15.9 kg)
Approximate shipping container size and weight are given for Model 239A with Laboratory Clamp Set. Sizes and weights will vary with other accessory options.
The Model 239A is available in kits configured for specific uses. The “Everything Kit” includes all the special tools and parts needed to fully realize the potential of this testing instrument. Individual components may be ordered to build your own customized system.
|Kit 2||Kit 3||Kit 4|
|KIT 1: Laboratory system||239-KIT-1001||Kit 1|
|KIT 2: Field survey system||239-KIT-1002||Kit 2|
|KIT 3: Panel testing system||239-KIT-1003||Kit 3|
|KIT 4: Everything||239-KIT-1004||Kit 4|
|Model 239A electronic unit||239-BAS-1001||1||1||1||1|
|Model 239A manual||LIT-MAN-1001||1||1||1||1|
|Laboratory clamp set with carrying case||239-ASM-1003||1||1|
|10-32 Micro/BNC cable||WIR-MUL-1006||2||2||2|
|Stress wave impact hammer||SEN-PIE-1005||1||1|
|Field test accelerometer||SEN-PIE-1002||1||1|
|Laboratory test accelerometer||SEN-PIE-1001||2||2||2|
|Lag screw clips with screws (set of four)||239-ASM-1002||1||1|
Ideal for laboratory testing. Easily fastened to bench top or other work surface for fixed-gauge-length testing. Set includes separate start and stop clamps. The start clamp includes a pendulum ballhammer device for initiating stress waves; start accelerometer mount; and toggle clamp for convenient attachment to specimen. The stop clamp includes a stop accelerometer mount and toggle clamp. Two Laboratory Application Accelerometers and two 10-32 Micro-to-BNC connector cables are required (sold separately). A portable carrying case is included.
Ideal for testing panel material; panels may be tested without cutting a specimen. The Trombone Clamp includes a fixture with a pendulum ball-hammer device for initiating a stress wave in a specimen. The fixture is pressed against the surface of a specimen and held in place by hand while the hammer device is actuated and readings are taken on the 239A Stress Wave Timer. Two Laboratory Application Accelerometers and two 10-32 Microto-BNC Connector Cables are required (sold separately).
Ideal for field testing, this self-contained, stainless steel impact device has a built-in start accelerometer for field testing, such as in structural decay surveys. Striking a test specimen with the Impact Hammer activates the start accelerometer and sends a stress wave through the specimen. The stress wave is then picked up by a stop accelerometer.
A BNC/BNC Cable is required. Either a Field Test or Laboratory Application Accelerometer can be used as the stop accelerometer. (WIR-MUL-1001)
This Lab Application Accelerometer is ideal for research of stress wave propagation in wood and wood-based products. It includes a 10-32 micro connector, and requires a 10-32 Micro/BNC Cable.
Use with Laboratory Application Accelerometer (SEN-PIE-1001)
The Field Test Accelerometer is used in field testing to pick up stress waves initiated by the Impact Hammer. It includes a BNC output connector. A BNC/BNC cable is required. The Field Test Accelerometer is shown with a lag screw clip (sold separately).
A lag screw clip is ideal for field tests where the test specimen will be examined repeatedly over a length of time. This clip provides a stable mounting point for the field test accelerometer. The kit includes one lag screw and one clip. Made of stainless steel.