Trigger Functions - Velleman PersonalScope HPS5 Manual

trig

Trigger functions

The Personal Scope is equipped with a number of "trigger" aids that are
used when the signal can be displayed on-screen. Press the "trig" key.
The t (trigger mode) key enables the user to select the appropriate
triggering method, the u (slope) key is used to select the trigger slope
(see below).
Press the t key repeatedly to choose between :
"run" mode: The signal will always appear on the screen,
regardless of the level involved. This position is used most
frequently and should always be used for measuring DC
voltages in particular.
"norm" mode: The screen will be adjusted provided that the
signal falls within the trigger level (interruption in the vertical
line on the left-hand side of your screen). Use this mode when
you want to start displaying the signal when it reaches a preset
threshold value.
"once" mode: The screen is adjusted one single time, viz.
when the trigger level is reached. Use this mode to detect e.g.
a short, once-only voltage peak.
ATTENTION : in the positions 10µs, 4µs and 2µs the unit will
automatically select the 'norm' trigger mode. The trigger level has to be
reached for the screen to be adjusted.
F
Both the p and the q key remain active in order to move the signal
along the Y-axis, which enables the user to programme a trigger
reference
Repeatedly press the u key to choose between :
Triggering on the rising slope of the signal. The screen will only
display the signal when a positive slope is "detected", viz. the
signal has to rise in vertical direction in order to trigger.
Triggering on the falling slope of the signal : The screen will only
display the signal when a negative slope is "detected", viz. the
signal has to drop in vertical direction in order to trigger.
Trigger on rising slope
Trigger on falling slope