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Chapter 5, FRONT PANEL OPERATION
Note that if the oscillator frequency sweep (see section 5.3.10) is also armed then the
controls that start, pause, continue and stop on the Amplitude Sweep menu will also
control the frequency sweep. Similarly, if the amplitude sweep is linked to the curve
buffer then the frequency sweep will be as well.
Pressing the Previous Menu key returns control to the Oscillator Menu.
5.3.12 Amplitude Modulation Menu
When the Oscillator menu is displayed, pressing a key adjacent to the Amplitude
modulation item accesses the Amplitude Modulation menu, which is shown in figure
5-16.
Figure 5-16, Amplitude Modulation Menu
The Amplitude Modulation menu has seven controls affecting the instrument's
internal oscillator. Changes to the setting of the controls can be made by using the
adjacent
keys.
When amplitude modulation is enabled, the internal oscillator's output amplitude can
be modulated by a signal applied to either the ADC1 auxiliary input or to the
external reference channel input (analog or TTL). The controls operate as follows:-
OSC FREQUENCY
This control may be set to any value between 0.5 Hz and 150.00 kHz. Adjustment is
faster using the Keypad or Active Cursor controls - see section 4.1.04.
MODULATION DEPTH
This control defines the maximum amplitude change that will be applied to the
oscillator signal. For example, when set to 100%, the change can be from full signal
output to zero; while if set to 50% the amplitude will change by 50% of its quiescent
level.
CENTER VOLTAGE
This control sets the input voltage corresponding to the quiescent oscillator output
amplitude.
VOLTAGE SPAN
This control sets the range of input voltages that will be translated into the set range
of modulation.
5-23
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