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1 Introduction
The MFD500B is an advanced digital ultrasonic flaw detector featuring full digital TFT LCD and a host of
new features to meet challenging inspection requirements. Combined with powerful flaw detection and
measurement capabilities, extensive data storage, it is capable for transfer detailed inspection data to
the PC via its high-speed USB port.
The instrument incorporates many advanced signal processing features including a 10MHz RF
bandwidth to permit testing of thin materials, narrow band filters to improve signal to noise in high gain
applications, a spike pulse for applications required higher frequencies and a adjustable square wave
pulse to optimize penetration on thick or highly attenuating materials.
The instrument can be widely used in locating and sizing hidden cracks, voids, disbands and similar
discontinuities in welds, forgings, billets, axles, shafts, tanks, pressure vessels, turbines and structural
components.
1.1 Features of the Instrument
The instrument extends the performance and range of applications that are capable of being satisfied by
a portable instrument. The quality, portability, durability, and dependability that you have come to expect
from the popular Mitech MFD Series instruments remain.
1
Leading Technology including full English menu, master-slave, shortcut key and rotary key
design, it is easy for operation.
2
Adopted with full digital TFT LCD, clear screen brightness, capable for choosing the
background color, waveform color and menu color. Adjustable brightness freely, suitable for operating
under different environments.
3
High performance security battery module is easy to assemble and disassemble, the instrument
can work continuously more than eight hours.
Display
Hi-resolution (320×240 pixels) full digital TFT LCD with adjustable brightness, it is capable of providing
high contrast viewing of the waveform from bright, direct sunlight to complete darkness.
The hi-resolution TFT LCD display with fast 60 Hz update gives an “analog look” to the waveform
providing detailed information that is critical in many applications including nuclear power plant
inspections.
Range
Up to 6000 mm in steel; range selectable in fixed steps or continuously variable, suitable for use on large
work pieces and in high-resolution measurements.
Pulse
Pulse Energy selectable among Low (300V), Medium (500V) and High (700V)
Pulse Repetition Frequency adjustable from 10 Hz to 1 KHz in 1 Hz increments
Damping selectable among 100Ω, 200Ω and 400Ω for optimum probe performance
Test Modes including Straight, Angle, Dual and Thru-transmission
Receiver
Sampling
：
10 digits AD Converter at the sampling speed of 160 MHz
Rectification
：
Positive Halfwave, Negative Halfwave, Fullwave and RF
Analog Bandwidth: 0.5MHz to 15MHz capability with selectable frequency ranges (automatically set by
the instrument) to match probe for optimum performance.
Gain
：
0 dB to 110 dB adjustable in selectable steps 0.1 dB, 2 dB, 6 dB, and locked
Gates
Two fully independent gates offer a range of measurement options for signal height or distance using
peak triggering.
The echo-to-echo mode allows accurate gate positioning for signals which are extremely close together.
Gate Start: Variable over entire displayed range
Gate Width: Variable from Gate Start to end of displayed range
Gate Height: Variable from 0 to 99% Full Screen Height
Alarms: Threshold positive/negative
