RIGOL MSO/DS1000Z Series - Manual (Page 113)

Chapter 5 To Trigger the Oscilloscope RIGOL
MSO1000Z/DS1000Z User’s Guide 5-39
Trigger Output Connector
The trigger output connector ([Trigger Out]) at the rear panel can output trigger
signals determined by the current setting.
A signal which reflects the current oscilloscope capture rate can be output from
[Trigger Out] connector each time a trigger is generated by the oscilloscope. If this
signal is connected to a waveform display device to measure the frequency, the
measurement result is equal to the current capture rate.
Note: If you press Utility  Aux Out to select "Pass/Fail" or press Utility 
Pass/Fail  Aux Out to select "ON", in the pass/fail test, when a failure is detected,
the oscilloscope outputs a negative pulse from the [Trigger Out] connector; when
no failure is detected, the oscilloscope outputs a low level continuously from this
connector.
Trigger Output Connector