Output  a  negative  pulse train  when  the  test  is  passed;  Output  a  negative 
pulse train when the test is failed. 
Same as pass failure mode, accompanied by ringing. 
2.15. Fast Action Buttons 
   
Auto Set: Automatically set the oscilloscope controls to generate a usable display of the input signals. 
Refer to the following table for relative content. 
Single: Acquire a single waveform and then stop the acquisition. 
Run/Stop: Continuously acquire waveform or stop the acquisition. 
Default Setup: automatically recall the default settings. 
Help:  Press  to  enter  the  built-in  help  system,  press  any  other  key  to  view  the  corresponding  help 
information, and press this key again to exit the help system. 
Save To USB: Save the current screen image to a USB external storage device. 
Decode: Display protocol decoding, set the main parameters of decoding. For details, see 2.8 Protocol 
Decoding. 
Time/Div: Press the time base knob to enter the dual window display mode. Press the knob again to 
exit the dual window display. 
2.15.1. AUTO SCALE 
Auto Scale is one of the advantages digital oscilloscopes have. When you push the Auto Scale button, 
the oscilloscope will identify the type of waveform (sine or square wave) and adjust controls according 
to input signals so that it can accurately display the waveform of the input signal.