Trigger Edge; Comprehensive Example - UNI-T UTG2122B User Manual

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.

3.2.7 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 .

3.2.8 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.
96 UTG2000B Series