LOCAL OPERATION
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Frequency modulation selection
Select frequency modulation as follows:
(1) Press [SIG GEN] to show the Sig Gen menu with the current modulation displayed in the
bottom half of the screen.
(2) Press the [FM] soft key if displayed (otherwise the instrument is already in the FM mode).
(3) Press [FM Devn]. Enter the deviation using the numerical key pad and terminate with the
[Hz] or [kHz] key. If you exceed the 100 kHz deviation limit it is automatically reset to the
maximum allowed value.
(4) If the internal modulation is to be the sum of two signals, select FM1 + FM2 internal from
the utilities (see ‘Mode selection’ on page 3-19). A typical display is shown in Fig. 3-16
above. Press the [FM2] key to select the second signal. Press the [FM2 Depth] key and
enter the required deviation for the second signal. If you exceed the (100 kHz − FM1)
deviation limit, it is automatically reset to the maximum allowed value.
(5) Select [FM Mod Freq], enter the modulation frequency and terminate with the [Hz] or [kHz]
key. If you exceed the 20 kHz modulation limit it is automatically reset to the maximum
allowed value.
(6) If required, change the waveform from that shown on the display (see ‘Internal waveform
selection’ below).
(7) Press [FM ON/OFF] to toggle between the on and off states as shown by the display.
Phase modulation selection
Select phase modulation as follows:
(1) Press [SIG GEN] to show the Sig Gen menu with the current modulation displayed in the
bottom half of the screen.
(2) Press the [
ϕ
M] soft key if displayed (otherwise the instrument is already in the ϕM mode).
(3) Press [
ϕ
M Devn]. Enter the deviation using the numerical key pad and terminate with the
[rad] key. If you exceed the 10 rad deviation limit it is automatically reset to the maximum
allowed value.
(4) If the internal modulation is to be the sum of two signals, select ϕM1 + ϕM2 internal from
the utilities (see ‘Mode selection’ on page 3-19). A typical display is shown in Fig. 3-16
above. Press the [
ϕ
M2] key to select the second signal. Press the [
ϕ
M2 Depth] key and
enter the required deviation for the second signal. If you exceed the (10 rad − ϕM1)
deviation limit, it is automatically reset to the maximum allowed value.
(5) Select [
ϕ
M Mod Freq], enter the modulation frequency and terminate with the [Hz] or [kHz]
key. If you exceed the 20 kHz modulation limit it is automatically reset to the maximum
allowed value.
(6) If required, change the waveform from that shown on the display (see ‘Internal waveform
selection’ on page 3-21).
(7) Press [
ϕ
M ON/OFF] to toggle between the on and off states as shown by the display.
Pulse modulation selection
Pulse modulation may be selected in addition to any other normal modulation modes. The source
is external from any of the PULSE INPUT sockets. Select pulse modulation as follows:
(1) Press [UTIL] to display the Utilities Selection Menu 1. If the Utilities Selection Menu 2 is
displayed, it will be necessary to press the [Utils Menu 1] key.
(2) Select [Mod’n Mode] to display the Modulation Mode Selection Menu.
(3) Press the [Pulse Enab/Dis] key to toggle between the ON and OFF states until the display
shows Pulse Mod’n: ENABLED.
(4) Press [SIG GEN] to return to the Sig Gen menu.
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General