Common Procedures ML248xA / ML249xA
13000-00162 5-53
September 2005
Measuring the Pulse Rise Time
The rise time of the pulse that the active marker is currently position on can be calculated
automatically as described below. The delta marker is set by default to the 90% linear
power point on the rising edge, and the active marker is set to the 10% linear power point.
These positions can be adjusted as required using the Search Set Up soft key. Refer to
the Setting the Search Target Levels later in this chapter.
1. Ensure that the active marker is positioned on top of the pulse for which
measurement is required. If it is not, use the right and left arrow keys on the numeric
keypad to position the active marker as required.
2. Press the Channel hard key followed by the Markers soft key to display the [Markers]
group of commands.
3. Press the Marker Functions soft key to display the [Mkr Funcs] group of commands.
4. Press the Advanced Functions soft key to display the [Adv Funcs] group of
commands.
5. Press the Pulse Rise Time soft key.
Note: Measurement is limited by a sampling resolution of 16 ns / point and a display
resolution of 200 / 400 points. For the highest resolution, the power meter must be set to
a capture time of 3.2 µs and 200 points, i.e. 200 x 16 ns = 3.2 µs, or 400 x 16 ns = 6.4 µs.
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