User Manual

3) In case of manual trigger, backlight of Trigger on front panel flashes. Frequency sweep
is output upon pressing Trigger .
f) Trigger Output
In case of internal or manual trigger source, the trigger signal (square wave) can be output
through external digital modulation interface (FSK Trig connector), compatible with TTL level.
The default trigger output is “OFF”. To change it, you can use multi-functional knob and
direction key on the interface for selecting frequency sweep mode or press Page Up/Down
and soft function key Param TrigOut On successively.
In internal trigger, signal generator outputs a square wave with duty ratio of 50% from
external digital modulation interface (FSK Trig connector) when frequency sweep starts.
Trigger period depends on designated frequency sweep time.
In manual trigger, signal generator outputs a pulse more than 1µs wide from external
digital modulation interface (FSK Trig connector) when frequency sweep starts.
In external trigger, trigger output will be hidden in parameter list, as trigger output is also
achieved through external digital modulation interface (FSK Trig connector). This interface
cannot be simultaneously used as external trigger input and internal trigger output.
g)Trigger Edge
Edge can be designated when external digital modulation interface (FSK Trig connector)
is used as input. When it is used as input (i.e. internal trigger source), “rising edge” means
that rising edge of external signal triggers output of a frequency sweep wave, and “falling
edge” means that falling edge of external signal triggers output of a frequency sweep wave.
The default edge is “rising edge”. To change it, you can use multi-functional knob and
direction key on the interface for selecting frequency sweep mode or press soft key
Param TrigEdge Fall .
h)Comprehensive Example
First make the instrument run in frequency sweep mode, and then set a square wave signal
with amplitude of 1Vpp and duty ratio of 50% as frequency sweep wave. The frequency
sweep mode is linear. Set starting frequency to be 1kHz, stop frequency to be 50kHz and
frequency sweep time to be 2ms. The specific steps are as follows:
Use frequency sweep function
Press Menu Sweep Type Line successively to display linear frequency sweep
(press soft key Type to select if Type is not highlighted) to start linear frequency sweep
function.
Figure 4-39 Select SWEEP function
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