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Operation and Reference
The Mod Source Frequency is entered by pressing the [Shift] key followed
by the [Freq] key. The Modulation Source indicator illuminates to indicate
the display contains a modulation source value. The sine wave frequency
values range from 0.1 Hz to 10 kHz with 2-digit resolution. The square
wave frequency values range from 0.1 Hz to 2 kHz with 2-digit resolution.
The modulation signal is momentarily disabled during modulation
frequency changes.
The Modulation Source is a free-running signal which is not phase-locked to the Main Signal
output or External Reference input. It has no DC offset or phase parameters. The
Modulation Source output is intended to drive high impedance inputs and should not be
terminated in 50n. It may be connected to both modulation inputs at the same time but the
extra loading may draw the output signal voltage down.
Arbitrary Waveforms
The modulation source may be programmed as an arbitrary waveform
source by a computer via HP-IB or RS-232. Once programmed, the
waveform is retained in nonvolatile memory and may be initiated from the
front panel. Select the arbitrary waveform with the [Shift] Mod Source
square wave key which illuminates the Arb indicator. The repetition rate of
the arbitrary waveform is set with the [Shift] [Freq] key. Repetition rates
range from 0.1 Hz to 10 kHz (the HP 3325B adjusts the value to compatible
internal frequencies). The default waveform is dc (after memory is cleared).
Disabling Modulation
Modulation is disabled by pressing the [AM Off] ([Shift] [Recall]) key or
[OM Off] ([Shift] [-]) key. The extinguished AM or OM modulation
I' _indicators provide a visual indication that modulation inputs are disabled.
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