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Racal Instruments 9916 User Manual

Racal Instruments 9916
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4.29
,The
10 kHz
control
signal
from
IC4/7
is
counted
in
the
b.c.d.
counter
IC23,
the
count
being
decoded
to
decimal
in
IC28.
In
states
0
to
7
of
IC23
the
numerical
indicators
are
enabled
in
turn
by
the
transistor
switches
018
to
25.
Since
the
indicator
enabling
signal
and
the
store
readout
are
controlled
by
the
same
10
kHz
signal
each
indicator
shows
the
contents
of
one
store.
4.30
To
ensure
that
each
numerical
indicator
shows
the
contents
of
the
correct
store
a
pulse
R(o)
is
produced
coincident
with
the
reading
of
the
10
0
store.
This
pulse,
available
at
[C4/14
is
used
to
set
IC23
to
state
0
at
the
time
of
the
100
store
readout.
Resolution
and
Decimal
Point
Sel
ection
4.31
The
resolution
of
the
instrument
is
governed
by
the
period
of
opening
of
the
main
gate,
whether
the
direct
or
prescaled
input
is
being
measured
and
whether
or
not
the
LF
multipl
ier
is
in
use.
4.32
The
period
of
opening
of
the
main
gate
is
controlled
by
the
.RESOLUTION
switch,
which
controls
the
logic
on
the
x,
y
and
z I
ines
to
IC4.
TfJe
logic
is
shown
in
Table
2
of
the
Technical
Specification.
lncreasing
the
gate
time
by
a
factor
of
10
effectively
shifts
~he
whole
display
to
the
left
by
one
digit,
and
the
decimal
point
must
be
shi
fted
to
correspond.
4.33
The
use
of
~he
'A'
Channel,
which
is
prescaled
by 10,
requires
the
movement
of
the
decimal
point
to
the
right
by
one
position,
while
use
of
the
LF
multiplier
requires
a
shift
to
the
left
of
two
positions.
4.34
The
decimal
point
occurs
in
the
numerical
indicator
which
is
enabled
when
028,
the
common
decimal
point
driver,
is
switched
on.
This
occurs
when
IC24q/3,
IC24b/6
and
IC24c/8
ore
at
'1'
simultaneously.
A
'I'
applied
to
one
gate
from
the
RESOLUTION
switch
ensures
this
is
not
achieved
except
when
the
desired
display
enable
I
ine
from IC28
goes
to
'0'.
4.35
The
display
enable
line
is
selected
by
the
multiplexers
1C20
and
IC27.
IC20
1 2
selects
the
B
inputs
when
LF
is
selected,
and
the
decimal
point
appears
in
the
10
, 10 ,
or
10
3
numerical
indicators.
When
LF
is
not
selected
IC20
accepts
~he
output
of
IC27.
When
the
'A'
Channel
is
selected
IC27/1
is
at
'0'
and
the
A
inputs
are
chosen.
The
decimal
point
therefore
appears
in
the
10
3
,
10
4
or
10
5
position
Eor
the'
A'
Channel
and
the
10
4
,10
5
or
10
6
positions
for
the
'B'
Channel.
t;
4.36
Decimal
point
information
relative
to
the
information
in
the
stores
in IC4
is
available
in
state
9
of
IC23
on
the
b.c.d.
output
lines.
This
information
is
modified
to
account
for
the
use
of
prescaling'or
LF
multiplication
before
it
is
made
available
at
the
Data
Output panel.
Modification
is
made
in
IC16,
where
information
from
IC22b,
c
and
d
is
added
to
that
from I
C4.
4-5
9916
Vol.
2

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Racal Instruments 9916 Specifications

General IconGeneral
BrandRacal Instruments
Model9916
CategoryMeasuring Instruments
LanguageEnglish