Logic Comparator - HP LOGIC PULSER 546A Operating And Service Manual

Page 12
Modei546A
Logic Comparator
The 10529A Logic Comparator (Figure 6) is an IC troubleshooting tool that electrically compares a
reference IC to an IC under test. The reference IC shares the power and input signals with the test
IC. When comparing the outputs of the two IC's, any level difference existing for 0.2
JJ.S
or more will
light an LED on the comparator, thereby indicating a fault.
The Logic Pulser allows in-cir-
cuit stimulation, so test pulses
may be introduced at circuit
nodes. Thus, reset or synchro-
nizing pulses may be injected to
reset the comparator's IC to the
same initial state as the test IC.
This allows the reference IC
and the test IC to begin oper-
ation from the same reference
point.
Figure
6.
Multi-pin Testing with Logic Comparator