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Chapter 5 To Trigger the Oscilloscope
RIGOL
Idle Time:
Press Idle Time to set the idle time before the edge counting in Nth edge trigger.
Rotate the multifunction knob
or use the pop-up numeric keypad to set the idle
time.
Edge Count:
Press Edges to set the value of "N" in Nth edge trigger. Rotate the multifunction
knob
or use the pop-up numeric keypad to set the edge count. Its available
range is from 1 to 65535.
Trigger Mode:
In the trigger control area (Trigger) on the front panel, press Mode to quickly switch
the current trigger mode. For details, refer to descriptions in "Trigger Mode".
Trigger Parameter Setting:
Set the trigger parameter (noise rejection) under this trigger type. For details, refer
to descriptions in "Noise Rejection".
Trigger LEVEL/Threshold Level:
Rotate the Trigger
LEVEL knob to adjust the trigger level/threshold level. Refer
to "Trigger LEVEL/Threshold Level". The current trigger level/threshold level
value is displayed at the upper-right corner of the screen.
RS232 Trigger (Option)
RS232 bus is a serial communication mode used in data transmission between PCs or
between a PC and a terminal. In RS232 serial protocol, a character is transmitted as
a frame of data. The frame consists of 1 start bit, 5-8 data bits, 1 check bit, and 1-2
stop bits. Its format is as shown in the figure below. MSO8000 series oscilloscope
triggers when the start frame, error frame, check error, or the specified data of the
RS232 signal is detected.
Start Bit
Data Bits
Stop Bit
Check Bit
Figure 5-13 Schematic Diagram of RS232 Protocol
Trigger Type:
Press Type, and then rotate the multifunction knob
to select "RS232". Press
down the knob to select the trigger type. Then, the current trigger setting
information is displayed at the upper-right corner of the screen, as shown in the
figure below. You can also press Type continuously to select the trigger type or
MSO8000 User Guide
5-33
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