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Ultrasonic Flaw Detector AS-4

Special Feature

AS-4 Ultrasonic Flaw Detector is a small portable detector, the introduction of foreign advanced technology, high-brightness selection rectangle , with a frequency bandwidth, high sensitivity, AC-DC dual-use, low power consumption, small size , light weight, reasonable structure, convenient operation and so on. The instrument performance is stable, reliable, applicable to all kinds of steel plate and forging weld testing, for mobility and high above the field, especially convenient.

Technical Specifications


Applicable standards IEC Pub 651 Type2,  ANSI S1.4 Type 2
Accuracy +/- 1.5dB (ref 94dB @1KHz)
Digital display 4 digital LCD
Measurement Level A weighting 30dB to 130dB
Measurement Level C weighting 35dB ~ 130dB
Level range 30-80dB,  50-100dB,  60-110dB,  80-130dB
Measurement frequency range 31.5 Hz to 8KHz
Frequency weight A and C
Time weight Fast and Slow
Microphone 1/2 inch Electret condenser microphone
Digital display 4 digit LCD,  0.1dB resolution,  updated every 0.5s
Quasi-analog bar indicator 1-dB steps,  50dB display range,  updated every 100ms
Display warning function Displayed at the upper limit
Displayed at the lower limit
Overrange indicator
Underrange indicator
Analong AC / DC output 2Vrms ( at full scale ),  10mVDC / dB
Power supply Four 1.5V LR-6/AA size alkaline cell,  AC adapter
Battery life about 20 hours
Operating temperature , humidity 5 ~ 40 ,  10 ~ 90% RH
Dimensions 265 (L)×72(W)×21(H)mm,  ( 10.4" L×2.8" W×0.8" H )
Weight Approx. 310g
Accessories Instruction manual ,  Battery ,  Carrying case ,
Adjustment screwdriver , Wind shield, 3.5 f plug


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Last modified: 06/14/20