scale, and turn it counterclockwise to increase the scale. During the 
modification, the display amplitude of the waveform will enlarge or reduce. The 
scale information in the corresponding status label will change accordingly. 
Press down this knob to quickly switch the vertical scale adjustment mode 
between "Coarse" and "Fine". 
⚫  Zoom: indicates the delayed sweep key. Press this key to enable or disable the 
delayed sweep function. 
 
⚫  Search: indicates the Search key. Press this key to enter the search setting 
menu. The search function allows you to search for relevant events from the 
collected data based on the search condition that you set. 
 
⚫  : indicates the navigation combination key. With the 
combination keys, you can perform recording & playing navigation, time 
navigation, and event navigation. 
 
⚫  Horizontal    POSITION: indicates the horizontal position knob. You can 
rotate the knob to modify the horizontal position (i.g. trigger position). The 
trigger point would move left or right relative to the center of the screen when 
you rotate the knob. During the modification, waveforms of all the channels 
would move left or right, and the horizontal position message (e.g.  ) 
at the upper-right corner of the screen would change accordingly. Press down 
this knob to quickly reset the horizontal position (or the delayed sweep 
position). 
 
⚫  Horizontal    SCALE: indicates the horizontal time base knob. You can rotate 
the knob to modify the horizontal time base. Turn it clockwise to decrease the 
time base, and turn it counterclockwise to increase the time base. During the 
modification, waveforms of all the channels will be displayed in expanded or 
compressed form, and the time base message (e.g.  ) at the upper 
section of the screen would change accordingly. Press down this knob to quickly 
switch the horizontal time base adjustment mode between "Coarse" and "Fine".