UNI-T UTG2122B, User Manual

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UTG2000B Series 105
●
Manual trigger: the instrument outputs pulse with over 1us pulse width from the beginning of
pulse train.
●
External trigger: the menu will hide the trigger output option which is enabled by external
modulation connector (FSK Trig connector). This connector should not be used as external and
internal at the same time.
3.3.9 Trigger Edge
Trigger 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 pulse train, and “falling edge” means that falling edge of
external signal triggers output of a pulse train. In gating mode, when polarity in parameter list is
“positive”, external signal triggers output of a pulse train at high level, and “negative polarity”
means that external signal triggers output of a pulse train at low level. When it is used as output (i.e.
“internal” or “manual” trigger and trigger output is “ON”), the default edge is “rising edge”. If you
need to change, press
Param
→
TrigEdge
→
Fall (Gating mode: press Param
→
Polarity
→
Negative )
Comprehensive Example
First make the instrument run in pulse train mode, and then set a sine wave signal with
period of 5ms and amplitude of 500mVpp as waveform of pulse train, set type of pulse train to be
N-cycle, period of pulse train to be 15ms and recurring number to be 2.The specific steps are as
follows:
Use pulse train function
Press Menu
→
Burst
→
Type
→
NCyc successively (press soft key Type to select if Type is not
highlighted) to set type of pulse train to be
“
N-cycle
”
mode.
Figure 3 - 52 Set N cycle function
Select waveform of Burst
After setting N-cycle mode of pulse train, press Carrier
→
Type
→
Sine to select carrier signal as
sine wave. The default waveform of pulse train is sine wave, so it is unnecessary to change in this
example.