Measurement-computing LGR-5320 Series Bedienungsanleitung PDF herunterladen (Seite 19)

LGR-5320 Series User's Guide Functional Details

The first step in both multichannel and analog triggering is to examine the input signals. To determine trigger

validity, the FPGA can examine each input signal in one of eight ways. Refer to the following table.

LGR-5325, LGR-5327, LGR-5329 trigger signal attributes

Trigger type Slope Duration Initialization

Above-level N/A Instantaneous Level

Below-level N/A Instantaneous Level

Above-level-with-latch N/A Latched Level

Below-level-with-latch N/A Latched Level

Rising-edge Rising Instantaneous Edge

Falling-edge Falling Instantaneous Edge

Rising-edge-with-latch Rising Latched Edge

Falling-edge-with-latch Falling Latched Edge

The input signals are compared a specified signal level.

Above-level trigger—This trigger is valid whenever the signal goes above the specified level, and stays valid

until the signal goes below the level.

In Figure 12, the channel trigger is valid during the two shaded intervals.

With the LGR-5327 and LGR-5329, whether or not this condition triggers an acquisition depends on the type of

multichannel triggering (AND or OR) and on the state of other trigger channels.

 With OR multichannel triggering, the LGR-5327 and LGR-5329 triggers a scan when the signal first rises

above the threshold. If the device is ready and the condition is met, the scan is triggered.

 With AND multichannel triggering, the LGR-5327 and LGR-5329 does not trigger a scan until every

specified trigger channel is valid. If all other trigger channels are valid, the device triggers an acquisition

when the signal reaches the shaded region. If some channels are not valid, however, this channel has no

effect.

Figure 12. Above level initialization, instantaneous duration

Below-level trigger

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

signal goes above the level—the opposite of above-level triggering.

With the LGR-5327 and LGR-5329, as with all multichannel trigger types, the acquisition's actual trigger

depends on the combination of this trigger with the other channels' trigger states.

Figure 13. . Below level initialization, instantaneous duration

Above-level-with-latch trigger—With this trigger type, the channel becomes valid when the signal level is

above the threshold, and remains valid until the acquisition is complete and re-armed.

Figure 14. Above level initialization, latched duration

Level

Trigger Trigger

Trigger

Level

Trigger

Level

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 42 43

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Measurement-computing LGR-5320 Series Bedienungsanleitung Seite 19