Dakota Ultrasonics DFX-8 plus MANUAL1 - Manual (Page 92)

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CHAPTER ELEVEN
ADDITIONAL FEATURES OF THE DFX-8
11.1 Pulse Width
The DFX-8 has a square wave pulser with adjustable pulse width option. Pulse
width, refers to the duration of time the pulser is left on. This time results in
increased energy sent into the test material. There are three width options (SPIKE,
THIN, and WIDE). The SPIKE setting may be desirable for high resolution and
general applications to decrease the overall noise. When additional energy is
needed, more penetration, the THIN and WIDE options may be necessary. The
standard setting is THIN.
The DFX-8+ is equipped with a “Tone Burst” style pulser, and supplies a constant
amplitude pulse to the transducer for a set amount of time, which is adjustable. The
key advantage using this type of pulser is that the frequency of the generated pulse
can be tuned to the frequency of the transducer, the bursts can be
adjusted/optimized, a clean narrow band ultrasonic wave produced, and exceptional
output at a given voltage. Therefore, the output of a general square wave pulser at
400V is approximately 12dB less than a tuned 400V tone burst style pulser. The
options for the DFX-8+ pulse width settings are; Spike, Thin, Wide, HV Spike, HV
Thin, HV Wide, TB 10MHz, TB 5MHz, TB 2MHz, and TB 1MHz. Depending on the
setting selected, the pulser voltage options will include the applicable settings/options
(i.e. if Thin is selected, the max output voltage option is 200V. However if HV Thin is
selected, the max output voltage option is 400V – HV or high voltage, etc.). Once the
pulse width option has been selected, refer to the pulser voltage menu option to
adjust the desired voltage. The procedure to change the pulse width is outlined
below:
For quick access and editing, refer to navigating the Hot Menus page 22.
Selecting the Pulse Width