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MODE
Selection
keys
(
FREQUENCY RANGE
Store
100
Ik
10k
100k
1M
The
MODE
selection
keys
are located
on
the
lower
left
of
the
front
panel
The Remote
Guard and
Remote
Sense keys
are
described
under
T+,
I-,
Hi,
Lo,
Guard and
4"
'•
STD, SET, ±0
and
CAL
are calibration
modes,
printed
in
red
and
described
in
Section
8.
SPEC
MODE
The Spec
key
controls the toggle-action 'Specification' func-
tion.
By
pressing the key,
the
4708
specification tolerances are
displayed
on
the
MODE
display, referred to
its
current
FUNC-
TION,
OUTPUT,
FREQUENCY
and
CALIBRATION
IN-
TERVAL
selection.
A
second
press cancels the
function.
For
24-hour
calibration
intervals,
the
'accuracy
relative to calibra-
tion
standards' figures are
displayed but
for
90 days and
1
year
intervals
they
are 'Traceable'
accuracy
figures
which
include
Datron's
Calibration Uncertainty.
Rear Panel
CALIBRATION INTERVAL
switch
While
in
Spec mode,
all
primary
functions
of
the other
MODE
keys
are cancelled (although the selected
Guard and
Sense
connections remain).
The
keys
are reassigned
to their
secon-
dary
functions:
+Iim,
-lim,
%
and
ppm
become
active.
When
Spec
mode
is
intiated,
the
magnitude of
the specification
toler-
ance
itself
determines whether
ppm
or
%
is
selected.
The
double-ended arrow above
the
Spec key shows
that
all
four
sec-
ondary
modes
are
available.
ERROR AND
OFFSET
MODES
These keys
are
used
to
deviate the
output
at
the terminals
from
the
value
on
the
OUTPUT
display.
The two modes may
be
selected together.
Error
and
Offset
Modes
NOT
Selected
The
terminal value
is
a
linear
function
of
the
OUTPUT
DIS-
PLAY
value:
Error
mode
selected
This
mode
allows a gain
error deviation
of
up
to
±10%
of
displayed value
to
be
applied
to the terminals. Full
details
are
given
in
Section
4.
Full
details
of
the operation
of
Specification
mode
are
given
in
Section
4.
3-9
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