Chapter 2 2-5
Getting Started
Front-Panel Features
10 The Data Control Keys, which include the step keys,
knob, and numeric keypad, allow you to change the
numeric value of an active function.
Data control keys are used to change values for
functions such as center frequency, start frequency,
resolution bandwidth, and marker position.
The data controls will change the active function in a
manner prescribed by that function. For example, you
can change center frequency in fine steps with the
knob, in discrete steps with the step keys, or to an exact
(1 Hz resolution) value with the numeric keypad.
The Knob provides fine incremental changes of
functions such as center frequency, reference level, and
marker position. Clockwise rotation of the knob
increases values. The extent of alteration is determined
by the size of the measurement range. The speed at
which the knob is turned affects the rate at which the
values are changed.
For slow sweeps, the analyzer uses a smooth panning
feature which is designed to move the trace display to
the latest function value as the knob is turned. When
center, stop or, start frequency or reference level is
adjusted, the signal will shift right or left or up or down
with the rotation of the knob before a new sweep is
actually taken. An asterisk is placed in the message
block (the upper right-hand corner of the analyzer
display) to indicate that the data on the screen does not
reflect data at the current setting.
The Numeric Keypad allows entry of exact values for
many of the analyzer functions. You may include a
decimal point in the number portion. If not, the decimal
point is placed at the end of the number.
Numeric entries must be terminated with a units key.
When a numeric entry is begun, the menu keys show
the units key labels. The units keys change depending
on what the active function is. For example, the units
keys for frequency span are
GHz, MHz, kHz, and Hz,
whereas the units for reference level are
+dBm, −dBm,
mV, and µV.
NOTE If an entry from the numeric keypad does not coincide with an allowed
function value (for example, that of a 12 MHz bandwidth), the analyzer
defaults to the nearest allowable value.
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