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10.1 Sync
The synchronous signal is output from the [FSK/Trig/Sync/Extmod] connector on the rear panel.
The instrument could output the sync signals of basic waveforms (except Noise), arbitrary
waveforms (except DC), Harmonics, Sweep, Burst and Modulation from a single channel or two
channels at the same time.
The sync signal is a squarewaveform that is "high" in the first half of the cycle and "low" in the
second half.When sync signal is disabled, the output level at the
[FSK/Trig/Sync/Extmod]connector is logic low.
The amplitude of Sync signal is not adjustable andis fixed at TTL level.
Sync Signals of Various Waveforms
For Sine, Square, Ramp, and Pulse, the sync signal is a Square with 50% duty cycle.When
the first wave point is output, the synchronization signal is TTL high level.When the frequency
of the basic waveform is less than or equal to 30 MHz, the sync signal has the same
frequency as the basic waveform. When the frequency of the basic waveform is greater than
30 MHz, the frequency of the sync signal is (the basic waveform frequency ÷2
n
). Wherein, n
represents the frequency dividing coefficient, and it is 1 when the frequency of the basic
waveform is greater than 30 MHz and less than or equal to 60 MHz, and it is 2 when the
frequency of the basic waveform is greater than 60 MHz and less than or equal to 90 MHz.
For noise, there is no sync signal output.
For arbitrary waveform, the sync signal is a square with 50% duty cycle.When the first wave
point is output, the sync is TTL high level.The frequency of the sync signal is the frequency of
arbitrary waveform.
For harmonics, the sync signal is a square with 50% duty cycle.When the first waveform point
is output, the sync signal is TTL high level.The frequency of the sync signal is the frequency
of the basic wave.
For AM, DSB-AM, FM, PM and PWM modulation, when internal modulation source is
selected, the sync signal is a square with 50% duty cycle and takes modulating frequency as
reference.When the first waveform point is output, the sync signal is TTL high level. When
external modulation source is selected, there is no sync signal output.
For ASK, FSK, PSK, BPSK, QPSK, 3FSK, 4FSK, OSK modulation, the sync signal is a
square with 50% duty cycle and takes the modulating rate as reference. For ASK, FSK, PSK,
OSK modulation, when external modulation is selected, there is no sync signal output.
For Sweep, when the frequency of the sweep signal is less than the mark frequency, the sync
signal is a TTL low level.When the frequency of thesweep signal is at or greater than the
mark frequency, the sync signal is changed from TTL low level to TTL high level.
For N-cycle burst, when internal or manual are selected as the trigger source, the sync signal
is TTL high level at the start of the burst.At the end of the specified count of cycles, the sync
signal is TTL low level (it may not be zero intersection if the waveform has an associated
starting phase).For an infinite-cycle burst, when manual triggered is selected, the sync signal
is the same as that of the basic waveform.For all burst types, when external trigger is
User Manual 70
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