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Modulation Keys
Pulse modulation is either internal or external. Internal pulse modulation is
either controlled by a built-in pulse generator, or preset to either a 1
kHz
or
a 27
kHz
square wave. When external pulse is selected, the instrument is
modulated by a signal present on the PULSE
IN/OUT
connector on the rear
panel.
When external modulation is enabled, the EXT MOD annunciator is turned on.
When internal modulation is enabled, the INT MOD annunciator is turned on.
10-3
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