1.4.4 The user can observe signals with short dura-
tion that are expanded with special pulse stretching
circuits. The REN line is at logic one
(O
.8Y) when the
REN annuncia
tor
is displayed. The pulse stretcher
turns it OFF for a visible period of time if the REN
lines go to logic zero (2Y) for 2 /-IS or longer. The IFC
line is at logical one (O.8Y), when the IFC annunciator
is displayed. The pulse stretcher turns it ON for a
visible period of time if the IFC line goes to a logic
O IlC
(O
.8Y) for 2 Ji S or longer.
1.4.5 The 488 Analyzer provides a terminal with 17
Test Points (TP) which parallels the GPIB connector.
The 18th TP provides the trigger
output
for peripheral
device. These TP connections expand the diagnostic
applications of the unalyzer. The lest point assignments
are listed in Table 3.5.
J.4.6 The 488 operates from a battery pack con-
taining 4 C-typc cells.
1.5 MECHANICAL IJESCRIPTION
1.5.1 The physical dimensions of the 488 Analyzer
are
out
lined in Figure 1.1. The top view shows the
control panel with the control switches for TRIGGER
condition, MEMORY and POWER on/
of
f. The LCD
Memory Location and Data display with nine status
indicators are also located on the control panel.
1.5.2 The rear panel includes the GPIB connector
and the parallel test poi
nt
(TP) terminals. The bo
tto
m
panel of the analyzer provides the battery pack access
d
oor
and concise operating instru ctions.
1-3