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Auto-Increment/Decrement
When
a
1
4
key
is
pressed
for
more
than
1/2
second,
its
digit
is
increased or
decreased
at
a
rate
of approximately
3
digits
per
second
until
the
key
is
released.
Overflow
and
Underflow
As
a
digit
is
stepped
from 9
to 0,
the
value of
the
next higher-
order
digit
is
increased
by
1
.
Stepping
from 0
to
9
decreases
the
value
by
1
.
The
whole
display therefore
acts as
a
counter,
with
full
'carry'
and
'borrow'
action.
Range
of
Adjustment
for
DC
Functions
The
t4
keys
adjust the readings
between
a
minimum
of
00000000 and 19999999
full
scale
on
lOOmV
-
lOOV
and
between
0000000 and 1999999
for
CumentRanges.
ThelOOOV
Range
has a
Full
Scale of
1
100.0000;
on
the
lOOpY,
ImV
and
lOmV
ranges
the resolution
is
truncated.
Range
of
Adjustment
for
AC
Functions
The
1 4
keys
adjust the
reading
between
a
minimum
of
0090000
(9%
of
Nominal
Range),
and
maximum
of
1999999
full
scale
on
lOOmV
-
lOOV
and
Current Ranges.
The lOOOV Range
has a
Full
Scale of 1100.000;
on
the
ImV
and
lOmV
ranges
the
resolution
is
truncated.
N.B,
There
is
no
range of adjustment
on
Resistance
functions.
Leading Zeroes
For
fractional
readings,
a leading zero
is
presented
to
the
left
of
the
decimal
point
to
emphasise
its
position,
except
for
OUT-
PUT
RANGE
selections
Im
and
L
DC ZERO
and
polarity.
On
DC
voltage
and
current, a
polarity sign
is
present except
at
zero.
The
numerical
display
represents the
magnitude of
the output.
As
the
display
value
is
stepped
to
zero, the polarity sign
disappears,
and
the
opposite
sign
appears
as stepping continues
in
the
same
direction.
If
the
OUTPUT
is
ON
during
the
sequence,
the
change
in
output
polarity
is
signalled
by
a change-
over
from one
polarity
ON
LED
to
the
other.
N.B.
If
the
4708
is
in
Offset
Mode,
with an
offset present,
the
display
and
output zeroes
do
not
coincide.
It is
therefore possible
to
have a
positive sign
on
the display,
and
the
ON
-
LED
Ut;
and
vice-versa.
When
using
the
1 4
keys
or
Zero
key
to
obtain a
zero, the
polarity
is
not
changed
over and
the
same
OUTPUT ON
LED
remains
lit.
The
polarity
LEDs
change over
only
when
the
opposite
polarity
appears
at
the
output
terminals.
Full
Range Key
When
the Full
Range
key
is
pressed, the display
reverts
to
the
nominal
value of
the
range
selected.
If
OUTPUT
is
already
ON,
the
terminal value follows
the
display value
unless:
1.
The
combination of
output voltage
and
frequency
would
exceed
the instrument's
internally
defined
limits.
(Refer
to
Section
6).
2.
OFFSET
or
ERROR
Mode
is
selected: the user-
input
offset
or gain
error
is
not cancelled
from
the
output.
Zero
Key
This reduces
the display
value
to zero.
If
OUTPUT
is
ON,
the terminal
value
is
also
set to zero:
DC
Voltage
—
an
active
zero
is
presented
to
the
output
terminals.
AC
Voltage
—
an
internal
short
circuit
is
connected
across
the
output
terminals.
DC
and
AC
Current
—
output terminals
are
open-
circuited.
On
Q
ranges
in
Remote
Sense
with
OUTPUT
ON,
the
Zero
key
connects a
true
4-wire
internal
short
circuit to
the
OUTPUT
terminals as
shown
below.
With
Remote
Sense
LED
UNLIT,
the
same
short
is
connected, but
the actual
resistive
value
of
this
short
may
be
calibrated
(See
Section 8
and diagram
below).
3-5
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