HP E1340A User's Manual
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Program Comments
The following information is associated with sweeping and frequency-shift
keying. Included are details on the operation of these functions, and on the
various modes, ranges, etc., used in the programs in this chapter.
Reference
Oscillator Sources
There are two reference oscillator sources for the AFG which are selected
by the
[SOURce:]ROSCillator:SOURce command:
EXTernal: The AFG’s front panel “Aux In” BNC .
INTernal: The internal 42.94967296 MHz oscillator.
The
INTernal reference oscillator gives a frequency resolution of .01 Hz.
INTernal is the default reference oscillator source. Thus, in many programs,
the source is not specified.
AFG Frequency
Modes
There are three frequency “modes” available in the AFG. The modes
selected by the
[SOURce:]FREQuency:MODE command are:
CW|FIXed: Single frequency mode.
FSKey: Frequency shift keying mode.
SWEep: Frequency sweep mode.
Frequency Points The number of frequencies generated (points) in a frequency sweep can be
from 2 to 1,073,741,824. The default number is 1001. The number of points
is set with the
SOURce:SWEep:POINts command and applies to sweeps
only.
Specifying a
Sweep Time
The sweep time (set by SOURce:SWEep:TIME) is the period from the
generation of the first frequency in the sweep or list to the generation of
the last frequency (see below).
The duration (t) of each frequency is:
specified sweep time/(frequency points - 1)
For multiple sweeps or repetitions through the list, the duration of the last
frequency (f
n
) is also t. To maintain a constant rate between sweeps or
repetitions, the duration of f
n
must be accounted for as follows:
Sweep time
specified
= Sweep repetition time
desired
* ((points - 1)/points)
Chapter 4 HP E1340A Sweeping and Frequency-Shift Keying 94