HP 54540 Series - Edge Trigger Mode

Figure 5-2
Trigger
Edge Trigger Mode
Edge Trigger Mode
Edge is the basic trigger mode, all the other trigger modes are a variation of
the edge mode.
The edge trigger mode identifies a trigger point by looking for a specified
slope and voltage level on a waveform on one source only. This process is
accomplished by arming the trigger on a voltage either slightly higher or
slightly lower than the trigger level. The difference between the arming
voltage and the trigger level is hysteresis. The arming voltage is set slightly
lower than the trigger level for a positive slope and slightly higher than the
trigger level for a negative slope. Then, a signal with the correct slope and
voltage level triggers the oscilloscope. You can use the edge trigger mode to
easily detect logic level transitions.
The trigger level (threshold) for each channel is set in the edge trigger menu
and is independent for each channel. It is carried over to all other modes,
except for the TV and glitch trigger modes. These levels are important
settings because the high and low levels in the pattern, state, and delay
modes are defined as being greater than or less than the trigger level.
EUGE TRIGGER
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5-5