Bnc 645 User Manual download pdf (Page 43)

(into a 50-ohm load) even if the modulation depth is greater than 100%.

How to set up amplitude modulation

1. Press one of the following function buttons to choose your carrier

waveform: Sine, Square, Ramp, Arb. Specify all the necessary

waveform parameters for the carrier waveform as described in

Section 4.1, 4.2, 4.3 and 4.6.

Figure 4-9

Press the Mod button to toggle on the modulation output.

Press the softkey under Type and press the softkey under AM to

select amplitude modulation. An amplitude modulation output will

be generated with the current parameters.

Press the softkey under Src to toggle between internal source (Int)

and external source (Ext) for selecting modulating waveform

source.

If internal source is selected:

Press the softkey under Shape to toggle between different

types of modulating waveform. If arbitrary waveform (Arb) is

selected as modulating signal source, the modulating signal

source is depending on the previous waveform selection in

arbitrary function. One may toggle the Mod key to see the

arbitrary modulating waveform message that temporarily

displayed on the screen.

Press the softkey under AM Freq and use numeric keypad or

the knob with the cursor keys to set the desired modulating

frequency.

Press the softkey under AM Depth and use numeric keypad or the

knob with the cursor keys to set the modulation depth.

Press the Graph button to view all the waveform parameters.

Remote interface operation

Use these commands to output an amplitude modulation waveform:

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Bnc 645 User Manual Page 43