Tektronix Blood Glucose Meter 524A User Manual

Logic Triggering

Reference

3Ć80

Table 3-4: Logic Triggers

Pattern

State

Definition

1,2

AND

Clocked AND

all the preconditions selected

for the logic inputs

are true,

then the oscilloscope triggers.

NAND

Clocked NAND

not all of the preconditions se-

lected for the logic inputs

are

true, then the oscilloscope trig-
gers.

Clocked OR

any of the preconditions se-

lected for the logic inputs

are

true, then the oscilloscope trig-
gers.

NOR

Clocked NOR

none of the preconditions se-

lected for the logic inputs

are

true, then the oscilloscope trig-
gers.

Note that for State class triggers, the definition must be met at the time the clock input

changes state. See the descriptions for Pattern and State in this section.

The definitions given here are correct for the Goes True setting in the Trigger When menu.

If that menu is set to Goes False, swap the definition for AND with that for NAND and for OR
with NOR for both pattern and state classes.

The logic inputs are channels 1, 2, 3, and 4 for the TDS 640A & TDS 644A and 1, 2, Aux 1

and Aux 2 for the TDS 620A & TDS 524A when using Pattern Logic Triggers. For State Logic
Triggers, channel 4 (Aux 2 for the TDS 620A & TDS 524A) becomes the clock input, leaving
the remaining channels as logic inputs.

The Logic Trigger menu (Figure 3-43) lets you select when to trigger (true or
false), set the thresholds for each channel, select the mode (auto or normal),
and adjust the holdoff.

Press TRIGGER MENU

➞

Type (main)

➞

Logic (pop-up)

➞

Class (main)

➞

Pattern or State (pop-up).

Operations Common
to Pattern and State