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2-9
Operating the Instrument
Exercise 5. Modifying the Setup
Using the keypad
When using the Agilent 83483A, 54751A electrical plug-in module, the knob or
arrow key changes the scaling from 50 mV/div to 100 mV/div, in one step. At
50 mV/div the signal is clipped, and at 100 mV/div the signal is
not
expanded
to take advantage of the full vertical size of the display. In this case, you can
use the keypad to set the scaling to 75 mV/div.
3
To set the scaling to 75 mV with the keypad, type the number
75
on the keypad.
Then press
milli
, for millivolts, to select the unit of measure.
When you select a key with a unit of measure written on it, you do
not
need to
press the
Enter
key. You only press the Enter key if you are entering numbers
that do
not
require a unit of measure or that are in volts or seconds. Depend-
ing on the value you enter with the keypad, the instrument may round the
value up or down. For example, if you try to enter 75.75 mV/div, the instru-
ment will automatically round the entry to 75.8 mV/div.
Setting the offset
Offset is similar to the vertical position on analog instruments, except offset is
calibrated. If offset is set to –10 mV, then you know the vertical center of the
display is –10 mV. (For optical channels, offset is referenced two divisions
above the bottom of the display.)
4
To move the waveform vertically on the display, press:
Offset
Readjust the scaling and offset until the signal is expanded vertically and is cen-
tered on the display as shown in Figure 2-2.