Tektronix 500C Manuel d'utilisateur télécharger pdf (Page 146)

Triggering on Waveforms

TDS 500C, TDS 600B, & TDS 700C User Manual

3–85

When you select the logic class State, the oscilloscope uses channel 4 as a clock

and triggers on a logic circuit made from the rest of the channels (pages 3–76

through 3–78 describe how state triggers work). To use state triggering, do the

following procedures.

Select State Triggering. Press TRIGGER MENU ➞ Type (main) ➞ Logic

(pop-up) ➞ Class (main) ➞ State (pop-up).

Define Inputs. To set the logic state for each of the input channels (Ch1, Ch2, ...):

1. Press TRIGGER MENU ➞ Type (main) ➞ Logic (pop-up) ➞

Class (main) ➞ State (pop-up) ➞ Define Inputs (main).

2. Choose either High (H), Low (L), or Don’t Care (X) (side) for the first three

channels. The choices for Ch4 are rising edge and falling edge.

Set Thresholds. To set the logic threshold for each channel:

1. Press TRIGGER MENU ➞ Type (main) ➞ Logic (pop-up) ➞

Class (main) ➞ State (pop-up) ➞ Set Thresholds (main) ➞ Ch1, Ch2,

Ch3, or Ch4 (side).

2. Use the MAIN TRIGGER LEVEL knob, the general purpose knob, or the

keypad to set each threshold.

Define Logic. To choose the type of logic function you want applied to the input

channels:

Press TRIGGER MENU ➞ Type (main) ➞ Logic (pop-up) ➞ Class (main) ➞

State (pop-up) ➞ Define Logic (main) ➞ AND, OR, NAND, or NOR (side).

Set Trigger When. To choose to trigger when the logic condition is met (Goes

TRUE) or when the logic condition is not met (Goes FALSE):

Press TRIGGER MENU ➞ Type (main) ➞ Logic (pop-up) ➞ Class (main) ➞

State (pop-up) ➞ Trigger When (main) ➞ Goes TRUE or Goes FALSE (side).

To State Trigger

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Tektronix 500C Manuel d'utilisateur Page 146