Measurement-computing WaveBook rev.3.0 Manual de usuario descargar pdf (Pagina 147)

WaveBook User’s Manual.

6-24-99

Theory of Operation 8-13

Above-Level Trigger

Rising slope

Instantaneous duration

Level initialization

Tri

er Level

Hysteresis

Tri

er Tri

Trigger

This trigger is valid whenever the signal level is above the trigger level and stays valid until the signal level

goes below the hysteresis range. In the figure, the channel trigger is valid during the 2 shaded intervals.

Whether this condition triggers WaveBook or not, depends on the type of multi-channel triggering ("AND"

or "OR") and on the state of other trigger channels. With "OR" multi-channel triggering, WaveBook will

trigger when the signal first rises above the trigger level—if ready for a new trigger, WaveBook will also

trigger the second time the signal rises above the trigger level. With "AND" multi-level triggering,

WaveBook will not trigger until every specified trigger channel is valid. If all other trigger channels are

valid, WaveBook will trigger when the signal reaches the shaded region; but if some channels are not valid,

this channel will have no effect.

Below-Level Trigger

Falling slope

Instantaneous duration

Level initialization

Tri

er Level

Hysteresis

No Tri

erNo Tri

Trigger Trigger

This trigger is valid whenever the signal level is below the trigger level and stays valid until the signal level

goes above the hysteresis range (the reverse of above-level triggering). As with all multi-channel trigger

types, WaveBook's actual trigger depends on the combination of this trigger with the other channels' trigger

states.

Above-Level-With-Latch Trigger

Rising slope

Latched duration

Level initialization

Tri

er Level

In this trigger type, the channel becomes valid when the signal level rises above the trigger level and stays

valid until the acquisition is complete and WaveBook is re-armed.

Below-Level-With-Latch Trigger

Falling slope

Latched duration

Level initialization

Trigger

Tri

er Level

The channel becomes valid when the signal level rises above the trigger level and stays valid until the

acquisition is complete and WaveBook is re-armed (the reverse of above-level-with-latch triggering).

Latched triggers are often used in multi-channel "AND" triggering, where WaveBook will not trigger until

all trigger channels are valid. After a latched trigger becomes valid, it stays valid (waiting for the other

triggers to become valid) until WaveBook is triggered and the acquisition completes. If the trigger is non-

latched instead of latched, the channel may not stay valid and WaveBook will not trigger until the channel

becomes valid again and all channels simultaneously reach their trigger levels. In other words,

latched

triggering is used to trigger after something has occurred, but non-latched triggering is used only during

the simultaneous occurrence of desired signal levels.

It is possible to combine different trigger types in a

single multi-channel trigger. For example, WaveBook could trigger when channel 3 is below 0.9 volts after

channel 2 has gone above -1.3 volts (by configuring channel 3 for below-level triggering and channel 2 for

above-level-with-latch triggering).

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