UTD2000 Series User Manual 
58 
 
or to filter any high or low frequency noise that is interfering with triggering. 
 
(4)  Slow refresh 
①. Check if the acquiring mode in ACQUIRE button menu is average, and the average 
times are large. 
②. If  increasing  the  refresh  speed  is  needed,  please  decrease  the  average  times 
appropriately or select other acquiring modes, i.e. normal sampling. 
③. Check if the persistence in DISPLAY button menu is set relatively long or infinite. 
(5)  The waveform is like stair-step shape. 
①. Stair-step waveform is normal. The horizontal time-base scale may be is overlow, 
increase the horizontal time base to increase the horizontal resolutuion, which can 
improve the display. 
②. The display type may be vector, the connecting line between sampling points may 
lead to a stair-step shape. Set the display type as point display to solve the problem.