UTD2000 Series User Manual 
37 
 
Vmax: Maximum voltage level. 
Vmin: Minimum voltage level. 
Vmid: Medium voltage level.   
Vamp: The voltage amplitude from waveform top to bottom.   
Vtop: The voltage value from waveform top level to GND (Ground).   
Vbase: The voltage value from waveform base level to GND (Ground).   
Over-shoot: The ratio between (Vmax – Vtop) and voltage amplitude (Vamp) in 
percentage 
Pre-shoot: The ratio between (Vmin – Vbase) and voltage amplitude (Vamp) in 
percentage 
Average: The average amplitude of signal within 1 cycle.   
Vrms: Root-mean-squarevalue (effective value). 
 
7.3 Time parameter 
Below are the automatically measured timing parameter for the UTD2000 series DSO 
and its definitions:   
 
Figure 7-3 Timing Parameter Diagram 
RiseTime: The time of waveform amplitude rising from 10% to 90%.   
FallTime: The time of waveform amplitude falling from 90% to 10%.   
+Width: The width of positive pulse at amplitude of 50%.   
-Width: The width of negative pulse at amplitude of 50%.   
Delay (rising edge): The delay time between rising edges. Delay (falling edge): the delay 
time between falling edges.   
+Duty: The specific value of positive pulse width and cycle.   
-Duty: The specific value of negative pulse width and cycle.