Olympus Sonic 1200S/HR, User Manual

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44 Chapter 4
wideband, 10 MHz tuned settings, and all RF displays to limit screen noise. The gain setting is
a relative value and does not reflect actual overall signal gain.
The instrument’s +dB feature is toggled OFF and ON alternately by pressing the gain soft key
when the gain parameter is highlighted. A +dB icon is shown in the status portion of the
display if this feature is active.
DB DIFF Allows the operator to establish a gain reference for signal amplitude comparison.
Pressing this soft key will force the instrument DB DIFF value to +0.0 dB. The DB DIFF value
will track all future changes in the gain value (+/-).
DISPLAY Selects the type of video. Available modes are positive halfwave “HALF+”,
negative halfwave“HALF-”, fullwave “FULLWAV”, “RF”, “RF+”(HR), “RF-”(HR), and
display filter functions (FILTR1, FILTR2, and FILTR3). Filters are only accessible with
software revision R00A or greater.
FREQ Selects the frequency of operation of the receiver filtering circuitry. Selections are
1MHz, 2.25 MHz, 5 MHz, 10 MHz, 15 MHz (HR), WIDEBAND (0.3 - 15 MHz), and HIPASS
(3 - 15 MHz). When the frequency control is changed, the square wave pulse width is
automatically set to one-half the wavelength of the selected setting.
REJECT Adjusts the linear reject level. This value is adjustable from 0 to 80% of full screen
height in 1% increments. When reject is on, a status indicator is displayed.
4.13 Range Menu
The RANGE key calls up the range menu shown and is used to adjust the time base
parameters.
GAIN See GAIN parameter description in the Receiver menu section.
RANGE Adjusts the time base range from 0.048 to 296 inches in steel. Adjustment step size
varies from 0.001 to 1 unit. The range is corrected for the down and back time of the signal
when operating in PULSE ECHO mode.
Refer to the VEL description for further Range limits.
RANGE