Triggering on Waveforms
3–80
TDS 500B, TDS 600B, & TDS 700A User Manual
Set the Level . Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞
Class (main) ➞ Width (pop-up) ➞ Level (main) ➞ Level, Set to TTL, Set to
ECL, or Set to 50% (side).
Set the Mode and Holdoff. Mode and holdoff can be set for all standard trigger
types and classes. To set mode and holdoff, refer to Set Mode & Holdoff on
page 3–61. To learn more about trigger mode and holdoff, see Trigger Modes
and Trigger Holdoff on page 3–53.
When you select the pulse class Slew Rate, the oscilloscope will trigger on a
pulse edge that traverses between an upper and lower threshold faster or slower
than a slew rate you specify. To set up for slew rate triggering, do the following
procedures.
Select Slew Rate Triggering. Press TRIGGER MENU ➞ Type (main) ➞ Pulse
(pop-up) ➞ Class (main) ➞ Slew Rate (pop-up). (See Figure 3–46 on
page 3–82.)
Select the Source. Press TRIGGER MENU ➞ Type (main) ➞ Pulse
(pop-up) ➞ Source (main) ➞ Ch1, Ch2, Ch3, or Ch4 (side). The source
selected becomes the trigger source for all four trigger classes.
Select Polarity. To specify the direction of the pulse edge, press TRIGGER
MENU ➞ Type (main) ➞ Pulse (pop-up) ➞ Class (main) ➞ Slew Rate
(pop-up) ➞ Polarity (main) ➞ Positive, Negative, or Either (side).
Positive monitors the slew rate of the positive-going edges of pulses. The edge
must first cross the lower threshold and then cross the upper threshold.
Negative monitors the slew rate of the negative-going edges of pulses. The edge
must first cross the upper threshold and then cross the lower threshold.
Either monitors positive- and negative-going edges of pulses. The edge may
first cross either threshold and then cross the other.
Set the Slew Rate. The threshold levels and the delta time setting determine the
slew rate setting. To set these parameters:
1. Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞
Class (main) ➞ Slew Rate (pop-up) ➞ Thresholds (main).
2. Press Set to TTL or Set to ECL (side) to set the upper and lower thresholds
to levels appropriate for those to logic families. ...OR...
To Trigger Based
on Slew Rate
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