B&K Precision 4052-4055 - Manual - Manual (Page 40)

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Arb = This will be the waveform that is currently loaded from within the arb function
menu. To change, follow the instructions in the previous section.
6. Select Source and choose between Internal or External.
Internal – The modulating source will be generated internally using the FM
Freq, FM Dev, and Shape as defined in the previous steps.
External – Use external modulating source. Users can connect an external
signal into the rear BNC terminal labeled Modulation In as the modulating
source. FM Freq and Shape options will not be available.
WARNING: Do not connect more than ± 6 V into the Modulation In terminal. This will
damage the instrument and void its warranty.
FSK (Frequency Shift Keying)
Follow the steps below to setup FSK modulation output.
1. Configure your waveform with the desired frequency and amplitude, then press the
Mod button. Under Type, select FSK.
2. There are three parameters that can be adjusted: Key Freq, Hop Freq, and Source.
3. To adjust FSK frequency, select Key Freq option from the menu. Key frequency
parameter will be highlighted by the cursor on the first digit. Use the rotary knob or
the numeric keypad to enter the modulating frequency. This is the frequency at
which the output frequency shifts between the carrier frequency and the hop
frequency.
4. Select Hop Freq to adjust the hop frequency.
5. Select Source and choose between Internal or External.
Internal – The modulating source will be generated internally.
External – Use external modulating source. Users can connect an external
signal into the rear BNC terminal labeled ExtTrig/Gate/FSK/Burst as the
modulating source.