Teledyne T3DSO1000, User Manual, Page: 72 / 227

54 User Manual
Note: Select a stable channel waveform as the trigger source to stabilize the display.
Trigger Source
The 2-channel oscilloscope’s trigger source includes analog channels, EXT , EXT/5 and
AC Line .
The 4-channel oscilloscope’s trigger source includes analog channels and AC Line .
Press the Setup button on the front panel to enter the TRIGGER function menu; press the
Source softkey and then turn the Universal Knob to select the desired trigger source.
The current trigger source is displayed at the upper right corner of the screen. Select
a channel with a signal input as the trigger source to obtain a stable trigger.
Analog channel input:
All signals from the analog channels can all be used as the trigger source, no matter
whether the channel selected is enabled, or not.
External trigger input:
External trigger source can be used to connect an external trigger signal to the EXT TRIG
channel if required. The trigger signal (such as an external clock or signal of the circuit to
be tested) will be connected to EXT and EXT/5 trigger source via the [EXT TRIG]
connector. EXT/5 trigger source attenuates the signal by a factor of 5. It extends the trigger
voltage level.
AC line:
The trigger signal is obtained from the AC power input of the oscilloscope. These kinds
of signals can be used to display the relationship between signal (such as an
illuminating device) and power (power supply device). For example, it is mainly used in
line frequency power related measurements.