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Operation and Reference
Modulation
The Main Signal may be amplitude or phase-modulated by a signal connected to either of the
two corresponding rear-panel connectors (Amptd Mod In or Phase Mod In). The signal may
originate from another signal generator or the internal modulation source may provide the
signal. After the connections are made to the rear-panel connectors, modulation of the Main
Signal is controlled by the operator.
T^e Mod Source keys provide an independent sine wave, square wave, or arbitrary waveform
signal through the rear-panel Mod Source Out connector. This signal may be used to
modulate the Main Signal by connecting it to the rear-panel modulation input connectorCs)
and pressing the appropriate front-panel keys to activate modulation and control the Mod
Source signal.
Amplitude Modulation
Shift "]
-EXT MOD
On
Store
n
AM
I
Shift
''—AM
u
Off I
Recotl
Amptd Mod In
(±6V)
Amplitude modulation of the Main Signal is enabled by pressing the
[AM On] ([Shift] [Store]) key which illuminates the AM indicator,
^plitude modulation is disabled by pressing the [AM Off] ([Shift] [Recall])
key which extinguishes the AM indicator, or by presetting the HP 3325B.
The modulating signal is applied to the HP 3325B through the rear-panel
Amptd Mod In connectors.
When amplitude modulation is enabled, the value entered for the amplitude
of the Main Signal is the maximum value possible, or 100% modulation
value. When no modulating signal is present or that signal is Oy the
amplitude of the Main Signal is half the entered value. (OV is considered to
be 50% modulation.) A modulation input of approximately 5 Vpk results in
100% modulation. Modulation frequency may range from 0 to 400 kHz.
If amplitude modulation is on when functions other than sine wave are
selected, the output may be gated, depending on the level of the modulation
input. Amplitude modulation should only by used with the sine wave
function, and the modulation input should not exceed ±10 Vpk.
1-28
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