-SCS Pulse Card (PGU and PMU) User's Manual Section 3:
Setting up PMUs and PGUs in Clarius
4200A-PMU-900-01 Rev. B March 2023 3-21
Period
The pulse period is the time interval between the start of the rising transition edge of consecutive
output pulses, as shown in the following figure. To minimize self-heating effects, set a pulse period
that is 10 to 100 times longer than the pulse width to produce a duty cycle that is 1 percent to
10 percent.
Figure 48: Pulse period
Width
The pulse width is the interval between the rising-edge and falling-edge medians. For a pulse with
fast edges (a short transition time), the pulse width is essentially equal to the interval from the start of
the rising edge to the start of the falling edge.
Rise and fall times are set independently. The pulse width is not affected by a change to the transition
time. However, start points may shift with changes in transition time.
The dashed line pulse in the following figure shows how increased transition time can affect the rising
edge and falling edge of the pulse. The shaded areas of the pulse show the changes in the slopes.
Notice that the pulse width interval is not affected. If the transition time is increased, the pulse would
not reach its programmed amplitude (100%).
Figure 49: Pulse width
Rise Time
The rise transition time for the pulse output.
Fall Time
The fall transition time for the pulse output.
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