RIGOL
Trigger Key Points
1. Trigger Source:
Trigger can occur from several sources: Input channels (CH1 or CH2), AC Line, Ext,
Ext/5. EXT
（
50
Ω
）
CH1 or CH2:
it is the most commonly used trigger source. The channel will function
when selected as a trigger source whatever displayed or not.
Ext Trig :
The instrument can trigger from a third source while acquiring data from
CH1 and CH2. For example, you might want to trigger from an external
clock or with a signal from another part of the test circuit.
The Ext, Ext/ 5 and Ext
（
50
Ω）
trigger sources use the external trigger
signal connected to the EXT TRIG connector. Ext uses the signal directly, it
has a trigger level range of +1.6 V to -1.6 V.
The EXT/ 5 trigger source attenuates the signal by 5X, which extends the
trigger level range from +8 V to -8 V. This allows the oscilloscope to
trigger on a larger signal.
EXT
（
50
Ω）
sets the input impedance to
50
Ω
. It is normally used for high
frequency signals where a 50
Ω
low impedance termination is required
CAUTION:
When 50
Ω
is selected,
ALWAYS ENSURE
the input voltage at
BNC does
NOT
exceed the maximum voltage (5Vrms) to avoid damaging
channel input components.
Do not use 50
Ω
with the standard probe.
!
AC Line:
AC power can be used to trigger DS5000 oscilloscope when you want to
look at signals related to the power line frequency, such as lighting
equipment and power supply devices. The oscilloscope get triggered on
it’s power cord, so you do not have to input a AC trigger signal.
When AC Line is selected as trigger source, the oscilloscope automatically
set coupling to DC, set trigger level to 0v.
Copyright 2004 Rigol Electronic
2-30
User Manual for DS5000 Series