Keysight Technologies 3458A Guide D'utilisation page 198

5 Digitizing
The coupling of the input signal can affect the level trigger coupling. That is, if
NOTE
you select AC coupling for the input signal (e.g., DSAC or SSAC) the level trigger
signal will also be AC coupled regardless of the specified level trigger coupling.
When the input signal is DC coupled (e.g., DCV, DSDC, SSDC) however, you can
control the coupling of the level trigger signal with the LEVEL command. The
level trigger coupling does not affect the input signal coupling.
The SLOPE command specifies the slope of the signal to use. The power-on or
default values for these commands specify a level percentage of 0% of the present
range (trigger when the signal crosses zero volts}, positive slope, and AC-coupling
to the level detection circuitry. So, in the power-on state, you can select the level
triggering shown in
LEVEL command).
The following program specifies level triggering to occur when the input signal
reaches +5 V (50% of the 10 V range) on a negative slope (AC-coupled). Assuming
the input signal has a peak value of 10 V and the measurement range is 10 V, the
result is shown in
10OUTPUT 722;"PRESET DIG" !DCV DIGITIZING, 10 V RANGE
20OUTPUT 722;"TRIG LEVEL" !SELECT LEVEL TRIGGER EVENT
30OUTPUT 722;"SLOPE NEG"!TRIGGER ON NEGATIVE SLOPE OF SIGNAL
40OUTPUT 722;"LEVEL 50, AC" !LEVEL TRIGGER AT 50% OF 10 V RANGE,
45!AC-COUPLED
50END
198
Figure 5-6 merely by specifying the LEVEL trigger event (TRIG
Figure 5-6.
Keysight 3458A User's Guide