BNC 645 - Manual (Page 51)

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When the external waveform is at the logic low level, the carrier
frequency is outputted. When a logic high is present, the hop frequency
is outputted.
FSK Rate
This is the rate at which the output frequency shifts between the carrier
frequency and the hop frequency when internal source is selected. The
default FSK rate is 10 Hz and the range is from 2 mHz to 100 kHz.
How to generate a FSK waveform
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 4-12
2. Press the Mod button to toggle on the modulation output.
3. Press the softkey under Type and press the softkey under FSK to
select FSK modulation. An FSK modulation output will be
generated with the current parameters.
4. Press the softkey under Src to toggle between internal source (Int)
and external source (Ext) for selecting modulating waveform
source.
5. If internal source is selected, press the softkey under FSK Rate
and set the desired shift rate using the numeric keypad or the
knob with the cursor keys.
6. Press the softkey under Hop Freq and set the desired hop
frequency using the numeric keypad or the knob with the cursor
keys.
7. Press the Graph button to view all the waveform parameters.
Remote interface operation
FUNCtion {SINusoid|SQUare|RAMp|USER}