1
Getting
Started
Functional Description
1-15
FM
The FM function modulates the 5251 carrier output in the frequency
domain. You can modulate the output using the built-in waveforms
standard waveforms, or download complex waveforms to the
modulation memory. FM can be used in continuous, triggered and
gated modes. The 5251 can generate two types of frequency
modulation: 1) Standard and 2) Arbitrary. In standard mode, the
modulating waveform is selected from a built-in library of 4
standard waveforms: sine, triangle, square and ramp. In arbitrary
mode, complex modulating signals are loaded to the modulation
waveform memory. There are 10,000 points allocated specifically
for the arbitrary memory that is used for arbitrary frequency
modulation and hence 10k unique frequency values may be used
for this function.
AM
The AM function modulates the 5251 carrier output in the amplitude
domain. There are four standard modulating waveforms that can be
used for the modulation scheme: sine triangle, square and ramp.
AM can be used in continuous, triggered and gated modes.
Frequency Hop
The frequency hop function causes the output frequency to hop
through a frequency list. The interval that the 5251 dwells on a
specific frequency is programmable for each hop. The dwell time
could also be set uniformly over the entire frequency list.
The frequency hop table can contain up to 1000 different frequency
values of which could range from 10 Hz to 100 MHz.
FSK
FSK (frequency shift keying) function shifts the carrier frequency
between two frequency settings. The trigger input is used for
programming the frequency value. Trigger false state generates
base frequency and trigger true state generates shifted frequency.
For positive true trigger state select the positive trigger slope and
for negative true trigger state select the negative trigger slope.
PSK
PSK (Phase shift keying) function shifts the phase of the carrier
frequency between two phase settings 0
°
and 180
°
. The trigger
input is used for programming the phase value. Trigger false state
generates 0
°
and trigger true state generates 180
°
. For positive
true trigger state select the positive trigger slope and for negative
true trigger state select the negative trigger slope.
Содержание 5251
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