Logic Gate Testing - HP LOGIC PULSER 546A Operating And Service Manual

Model 546A
Page 9
Logic Gate Testing
A
logic gate may be tested by pulsing the gate's input, while monitoring the output with a Logic Probe
(see
Figure 3).
The Logic Pulser generates a pulse opposite to the state of the input line and can
change the gate output's state. This assumes the output of the gate is not clamped in its state by an-
other input, e.g., a
HIGH
on the other input of an
OR
gate.
H
SL
PULSER
H
L
PULSER
PROBE LIGHT
BLINKS OFF
GATE OK.
NO CHANGE OF
STATE, INVERTER
IS FAULTY
GATE UNDER
TEST
Figure 3. Logic
Gate
Testing