User manual

30
UNI-T
®
UT4000 User Manual
When PAL is selected for video and synchronization mode is line, you will see a screen
display as shown in Figure 2-15. When synchronization mode is field, you will see a
screen display as shown in Figure 2-16.
Figure 2-15 Video trigger : line synchronization
Figure 2-16 Video trigger : field synchronization
Slew Rate Trigger
When slew rate trigger is selected, trigger occurs if the slew rate of the signal’s rising or
falling edge is the same as the default value. Below is the trigger menu :
Table 2-11
Function Menu Setup Explanatory Note
Type Slew rate
Signal source CH1
CH2
EXT
EXT/5
AC
CH1 & CH2
Set CH1 as the signal source trigger signal.
Set CH2 as the signal source trigger signal.
Set the external trigger input channel as the signal
source trigger signal.
Divide the external trigger source by 5 times.
Set grid trigger.
CH1 and CH2 trigger their respective signals
alternately.
Trigger coupling DC
AC
L/F Suppression
H/F Suppression
Allow AC and DC quantities of the trigger signal
to pass.
Intercept DC quantities of the trigger signal.
Reject low frequency quantities and allow only
high frequency quantities to pass.
Reject high frequency quantities and allow only
low frequency quantities to pass.
Trigger mode Auto The system automatically acquires waveform data
when there is no trigger signal input. The scan
baseline is shown on the display. When the trigger
signal is generated, it automatically turns to
trigger scan.