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Introducing the Instrument
A Quick Tour of the Front Panel
Because the Trigger menu only has one of this type of softkey, it is active when
the menu comes up on the display. You do not need to press the Level softkey
when you want to change the trigger level. However, the Time base menu has
at least two of this type of softkey, Bit Rate (HP 83480A only) and Scale and
Position. In this case, only one of the softkeys is active at a time. To make the
other softkey active, you must press the corresponding softkey. You can tell
which softkey is currently active because it has a different colored background
from the rest of the softkeys.
When using time base scale or channel scale, the knob and arrow keys operate
in two modes. One mode is a 1-2-5 sequence, while the other mode is a fine
mode that allows you to make smaller incremental changes. You activate the
fine mode by pressing Shift on the keypad, followed by pressing the arrow key
with the word Fine written in blue above that key. When the fine mode is
active, you will see the word Fine at the top-right corner of the graticule area.
You get out of the Fine mode by simply pressing Shift on the keypad, followed
by pressing the arrow key with the word Fine written above it.
List softkeys
A typical example of the list softkeys is Hysteresis. It has several stacked rect-
angles that represents a list of choices you can choose from. The top rectangle
shows the selection that is currently active. In the example below, normal is
the current selection.
Figure 1-6. List softkey selection
1-9
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