3. Operating in Phased Array Mode
Page 40 PHASOR XS Operating Manual
Changing the Gain-Adjustment Increment
(dB STEP)
When adjusting the A-Scan gain, each click of the gain
knob increases or decreases the gain level by a dB in-
crement equal to the dB STEP (identified in
Figure 3-2).
Several values can be specified for dB STEP, including
a Gain Knob LOCK, which prevents any gain adjustment.
To select one of the existing dB STEP values:
Step 1: Press
.
Step 2: Note that the dB STEP (gain-adjustment
increment) value changes as you continue to push
.
Available increments include: 0.1dB, 0.2 dB, 0.5 dB, 1.0
dB, 2.0 dB, 6 dB, and LOCK.
Step 3: Once a dB STEP value has been selected,
each click of the Gain Knob will increase or decrease the
instrument’s gain by the dB STEP increment.
NOTE: Pressing and holding
will switch the type of
gain controlled by the Gain Knob between dBD (digital
gain) and dBA (analog gain). The type of gain that is
NOT controlled by the Gain Knob will appear in the
top function bar position and can be controlled by the
Function Knob.
Locking the Gain Rotary Knob
The gain knob can be locked so that turning it has no
effect on the instrument.
Step 1: Continue pressing
while observing that the
value of dB STEP (in the upper left-hand corner of the
display) changes to various step values. When the word
LOCK appears as the dB STEP value, the gain knob is
locked.
FIGURE 3-6—Setting Analog (dBA) and Digital (dBD) Gain and using the dB REF Feature
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