HP 5300A - Page 21

Model 5300A
Theory of Operation
Figure 4-4. 5300A Simplified Block Diagram
5300
MAINFRAME
to
U2
CHARACTER
GENERATOR
OVERFLOW
LIGHT
SAMPLE
RATE
\
i i
TT max
__j_ OUT TIME
A IMHz 8
rf
|
|
TIMEBASE
FUNCTION
7
ae
SELECTOR
SWITCHING
|
optionat
|
SWITCH CONTROLS
{5310 BATTERY] REGULATED
Le
PACK __ 5 POWER TO
PLUG-ON
YPICAL PLUG-
ON MODULE
IN FREQ.
MODE
e. Time base (ALU4). An eight-decade 10 MHz,
automatic time-base divider.
f.
Control
(A1U5).
Provides
the
basic
control
functions
and
gating
for
counting
and
timing
measure-
ment
cycles,
including
auto-ranging,
transfer,
reset,
and
sample
rate
control.
g.
Reference
Oscillator
(A1U8
and
Y1).
A
10
MHz
crystal-controlled
oscillator
which
provides
the
basic
frequency
and
time
references
for
the
system.
h.
Power
Supply.
Provides
regulated
voltages
to
the
mainframe
and
all
plug-on
modules
and
charging
power
to
the
optional
battery
pack
module.
Power
Supply
Input
can
be
115
Vac
or
230
Vac
line
voltage
or
dc
power
from
the
battery
pack.
4-19.
These
basic
functional
blocks
of
the
mainframe
may
be
interconnected
in
many
ways
to
provide
dif-
ferent
measurement
capabilities.
A
typical
system
interconnected
for
frequency
measurement
is
shown
6- DIGIT LEO
OISPLAY
Ui
SCANNER
AMPLIFIER/
TRIGGER
DS2-6
UNITS
0S7
DECIMAL
ANNUNCIATOR
POINTS
LRLRLRLRLALR
DIGITAL
RECORDER
SURFER OUTPUT
a U6, U7
DATA A,B,C, D,
MANUAL RESET
"ey
pc/oc u4 us U3 us
oc/0 REFERENCE
CONVERTER TIMEBASE fd CONTROL COUNTER OSCILLATOR
3
7.8.
MAINFRAME /
/ PLUG-ON
50 PIN
CONNECTOR
DIGIT DIGIT
PLUG-ON
ADDRESS SELECT DATA
X,Y,Z X,Y, Z
EXPONENT COUNT EXPONENT
REGISTER
in the block diagram, Figure 4-4. The major signal and
control lines are all routed via the plug-on connector
and the plug-on module, which determines measure-
ment function as well as providing the input signal
interfaces.
4-20. The four-wire data bus carries the system data
between modules in a binary-coded-decimal, digit-
serial format. Data can flow from A1U3 counter to
DS7 display, to the digital recorder output, and to the
plug-on module, or from the plug-on module to DS7
display and to the digital recorder output. The trans-
fer of data to the display is controlled by a 3-bit
binary code (Digit Address) which is generated by the
scanner, Al1U1. A 3-bit code (Digit Select) controls
the data output from the counter. With most plug-on
modules the displayed information is the stored con-
tents of AlU3 counter. In these modules, the digit
address lines are wired directly to the digit select
lines with the modules.
4-3