User`s guide

Chapter 2 Front Panel Operations RIGOL
M300 User’s Guide
2-9
alarm data in the non-volatile memory automatically. You can press at the front
panel to view the history measurement data (including the maximum, minimum,
average and standard deviation).
External Trigger
To use the external trigger mode, first use the mixed-interface separator line
(accessory) to convert the [RS-232/Alarms/Ext Trig] interface at the rear panel
to two 9-pin interfaces. Wherein, the 9-pin male interface is a standard RS232
interface and the 9-pin female interface is used for alarm output, external trigger
signal input (pin 6, as shown in the figure below) and so on. Secondly, you need to
select the edge type (rising or falling) for the external trigger signal. In external
trigger mode, the instrument initialize a trigger when a trigger signal met the
conditions is received by the Ext Tig Input terminal.
Alarms/Ext Trig
In external trigger mode, if the number of scans is set to “Infinite”, after you press
Run/Stop at the front panel, the instrument enters the wait-for-trigger state and
then executes a scan each time an external trigger signal is received. Press and hold
Run/Stop and the instrument will exit the wait-for-trigger state.
If the number of scans is a specific value, after you press Run/Stop at the front
panel, the instrument enters the wait-for-trigger state and then the instrument
executes a scan each time an external trigger signal is received. After executing the
specified number of external triggers, the instrument exits the wait-for-trigger state.
During the scan, the instrument stores the measurement data, scaling data and
alarm data in the non-volatile memory automatically.
Absolute Time Trigger
Pin 6: Ext Trig Input/Channel
Advance Input