DETAILED OPERATION
4-27
Modulation selection
The carrier can be frequency, amplitude or phase modulated from an internal or external source.
Additionally, pulse modulation is available from an external source or (if Option 9 is fitted) from
an internal pulse generator. The internal modulation oscillator is capable of generating two tones
simultaneously in one modulation channel and has a frequency range of 0.01 Hz to 100 kHz.
Amplitude modulation selection − internal
Having previously selected the modulation mode (see ‘Mode selection’ above) select amplitude
modulation as follows:
(1) Press [MOD] to display the main screen with AM1 Depth highlighted.
(2) Enter the required internal modulation depth via the numerical key pad and terminate with
the [%] key. If you exceed the 99.9% modulation depth it is reset by default to the
maximum value.
(3) If the internal modulation is to be the sum of two signals (selected from the Util 30 menu),
press the [MOD] key again to highlight AM2 Depth. Enter the required modulation depth
for the second signal. If you exceed the (99.9% − AM1) modulation depth limit it is reset
by default to the maximum allowed value.
Frequency modulation selection − internal
Having previously selected the modulation mode (see ‘Mode selection’ above) select frequency
modulation as follows:
(1) Press [MOD] to display the main screen with FM1 Devn highlighted.
(2) Enter the required internal FM deviation via the numerical key pad and terminate with the
[Hz] or [kHz] key. If you exceed the 100 kHz deviation limit it is reset by default to the
maximum value.
(3) If the internal modulation is to be the sum of two signals (selected from the Util 30 menu),
press the [MOD] key again to highlight FM2 Devn. Enter the required deviation for the
second signal. If you exceed the (100 kHz − FM1) deviation limit it is reset by default to
the maximum allowed value.
Phase modulation selection − internal
Having previously selected the modulation mode (see ‘Mode selection’ above) select phase
modulation as follows:
(1) Press [MOD] to display the main screen with
Φ
M1 Devn highlighted.
(2) Enter the required internal ΦM deviation via the numerical key pad and terminate with the
[rad] key. If you exceed the 10 radians deviation limit it is reset by default to the maximum
value.
(3) If the internal modulation is to be the sum of two signals, press the [MOD] key again to
highlight
Φ
M2 Devn. Enter the required deviation for the second signal. If you exceed the
(10 rad − ΦM1) deviation limit it is reset by default to the maximum allowed value.
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