T3DSO2000A Manual. Page 21
Trigger source
•
C1~C4: Analog channels
•
EXT: External trigger channel
•
EXT/5:5x attenuation of external trigger channel
•
AC Line: AC mains supply
•
D0~D15: Digital channels
Trigger coupling: Coupling mode of the current trigger source. It is only valid when the
trigger source is C1~C4, EXT or EXT/5.
•
DC
：
All the signal’s frequency components are coupled to the trigger circuit for high-
frequency bursts or where the use of AC coupling would shift the effective trigger level.
•
AC
：
The signal is capacitively coupled. DC levels are rejected. See the datasheet for
details of the cut-off frequency.
•
HFR
：
Signals are DC coupled to the trigger circuit, and a low-pass filter network
attenuates high frequencies (used for triggering on low frequencies). See the
datasheet for details of the cut-off frequency.
•
LFR
：
The signal is coupled through a capacitive high-pass filter network, DC is
rejected and low frequencies are attenuated. For stable triggering on medium to high-
frequency signals. See the datasheet for details of the cut-off frequency.
Trigger mode
•
Auto: The oscilloscope will sweep without a set trigger. An internal timer triggers the
sweep after a preset timeout period so that the display refreshes continuously. This is
helpful when first analyzing unknown signals. Otherwise, Auto functions the same as
Normal when a trigger condition is found.
•
Normal: Sweeps only if the input signal meets the trigger condition. Otherwise, it
continues to display the last acquired waveform.
•
Stop: Stops the acquisition and displays the last acquired waveform.
Trigger level: The source voltage level or levels that mark the threshold for the trigger to
fire. Trigger levels specified in Volts normally remain unchanged when the vertical gain or
offset is modified.
Trigger type: See the chapter "Trigger" for details.
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