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DATA ENTRY READOUT
The DATA controls will change the activated function in a manner prescribed by that function. For example, center
frequency can be changed continuously with the DATA knob 0 , or in steps proportional to the frequency span
with the DATA STEP keys @ a , or set exactly with the DATA number/units keyboard. Resolution band-
width, which can be set only to discrete values, can still be changed with any of the DATA controls. The DATA
knob 0 and DATA STEP keys 13 61
from the number/units keyboard which may not coincide with an allowable bandwidth will select the nearest
bandwidth.
DATA ENTRY READOUT
DATA entries are read from the CRT display as they are changed.
PREVENTING DATA ENTRY
A function can be deactivated by pressing m . The active function readout is blanked and the ENABLED light
goes out, indicating no DATA entry can be made. Pressing a function key re-enables the DATA controls.
DATA KNOB
The DATA knob 0 11 a ows the continuous change of center frequency, frequency span (or start/stop frequen-
cies), reference level, marker positions, display line, and threshold. It can also change the function values which
are only incremented.
Clockwise rotation of the DATA knob will increase the function value. For continuous changes, the knob's sensitiv-
ity is determined by the measurement range and the speed at which the knob is turned. For example, when the
center frequency is activated, 0 increases the value of the center frequency one horizontal division of span per
one quarter turn.
DATA STEP KEYS
The DATA STEP keys allow rapid increase @ or decrease r
dependent either upon the analyzer's measurements range, on a preset amount, or, for those parameters with
fixed values, the next value in a sequence. Examples: Activate center frequency and 0
frequency value by an amount equal to one division of the frequency span (one tenth of the frequency span). If
the center frequency step size m has hen preset, El will increase the center frequency by that preset
amount. If frequency span were activated, 10) would change the span to the next lower value in predetermined
sequence. Activate resolution bandwidth and [& ~ will select the next widest bandwidth. Each press results in a
single step,
16 Manual Operation
increment the setting from one bandwidth to the next. An entry
DATA
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