Chapter 2: Front Panel Operation
42 2500A Series Operation Manual, 34172 Revision C, March 2008
Figure 2-17: AM - Internal Waveform with Interactive Softkeys
The following explains each item in the AM- Internal Waveform menu:
AM. TThis menu item turns amplitude modulation on and off. Note that this setting only enables or dis-
ables amplitude modulation; it is the active menu, that is, the menu that is currently being displayed, that
determines the AM mode that is used. Pressing either the adjacent soft key or the Step Up or Step Down
buttons toggle the AM state.
Depth. This menu item allows you to view and modify the AM depth setting, which is the extent of the
variation of the modulated RF output signal’s amplitude expressed as a percentage.
Rate. This menu item allows you to view and modify the rate (frequency) of the internal modulating sig-
nal.
Waveform. This menu item allows you to view and choose the type of waveform used as the internal
modulating signal. The available selections are Sine, Triangle (symmetrical triangle wave), Ramp (posi-
tive going ramp), or Square (50% duty cycle square wave).
2.3.5.3 AM - Internal Noise
The AM - Internal Noise menu allows you to view and modify settings related to an internal amplitude
modulation mode in which the modulating signal is an internally-generated Gaussian noise source (the
signal at the AM IN connector is not used).
Figure 2-18 shows the AM - Internal Noise menu:
AM - Internal Waveform
On/Off
30.00%
AM
Depth
Rate
Waveform
1.00 KHz
Ramp
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