Introduction To Sweeps - HP 3325B Operating Manual

Operation and Reference
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Introduction to Sweeps
The iff 3325B performs three kinds of sweeps: linear, log, and discrete. Linear sweeps of any
function have sweep-time limits of 10 ms to 1000s and may be single or continuous. Single
linear sweeps may be either up or down in frequency. Continuous sweeps move back and
forth between the start and stop frequency in an up/down/up/down. .. fashion. The marker
functions only during up-sweeps.
Log sweep times ran^ from Is to 1000s for single sweeps and from 0.1s to 1000s for
continuous sweeps. Single log sweeps are up-only; they always start at the start frequency
and sweep up to the stop frequency The marker does not function during log sweeps.
creation of custom sweep patterns. A discrete sweep consists of up
to 100 linear sweeps or frequency steps (called segments). Each segment has four
parameters: start frequency, stop frequency, sweep time, and marker frequency, which may
be entered from the front panel or down-loaded from a computer. The marker functions as
specified for each segment whether the sweep is up or down.
Single or continuous frequency sweeps are selectable with the [Start] and [Reset/Start] keys
Sweep parameters are entered with the [Start Freq] (start frequency), [Stop Freq] (stop
frequency), and [Time] keys. The [Mkr CF] (marker into center frequency), [Af x 2], and
[At 2J keys allow convenient modification of the sweep parameters. The [M^ Freq]
(marker frequency) key allows the rear-panel TTL level marker output signal to be specified.
linear sweeps are phase-continuous over the full frequency range of the main output signal;
discontinuities in the swept output waveform. When the
HF 3325B IS turned on, the sweep is off, the sweep mode is set to linear, and the parameters
are set as follows:
Start Frequency
Stop Frequency
Marker Frequency
Time
1 000 000.0 Hz
10 000 000.0 Hz
5 000 000.0 Hz
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