Solartron 1287 - O;Ltype; Standby

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•
Auto-range
operates
by sensing
the cell
current and
connecting
the
appropriate
standard
resistor
just before
a measurement
is made.
Therefore
it is
possible for
a
rapidly
rising
current
to be measured
on
too low a range,
resulting
in
an off-limit
condition.
I Limit
> >
The remote
command
is IL7 .
Refer to Chapter
4,
Section
6.6.
The current
limit defines
the highest
current
range
to be used
in auto range
mode.
Should
the measured
current
exceed the
full scale value
of
this range
then an overload
action
is triggered
(see section
2.2);
enter after
selecting
[auto].
2.2
{O/L TYPE}
>
> The
remote
command is
OL«.
Refer
to Chapter
4,
Section
6.7.
If the
current flow
through the
cell exceeds
(by
more than
-25%
maximum)
the
full-scale
value
for that range,
an
overload
condition is triggered.
The
action
to be
taken
is
selected
by the
user via
this menu:
[warning]
A
’beep’ sounds,
and a warning
message
is displayed.
Caution:
[warning]
does not
itself
limit the current
in any way
and
so cannot
prevent
excessive
current
damaging
a cell.
If this
is
at
risk select
[limit] or
[cut-out].
[limit]
The current
is allowed
to rise
to the
full-scale value, or
ILimit
if in auto,
but it
is inhibited
from
exceeding
it by negative
feedback.
[cut-out]
Current flow
is cut off
completely
when
the overload
condition
arises,
by the
SI1287
switching
to the
’standby’
state.
2.3
{STANDBY}
>
>
The remote
command
is BY/.
Refer
to Chapter
4,
Section 6.2.
Selects which
cell
connections
are isolated
in the
’standby’ state.
Either
of two
states
may be
selected: "full
standby"
and "half
standby".
Full standby
is
the
default state.
Should
you require
half
standby, this
must be selected
prior
to
polarizing
the cell.
[all o/c]
Known
as "full
standby", in which
CE,
RE1 and RE2
are isolated,
leaving
only
WE
connected.
In full standby,
only
the following
measurements
are valid:
DVM I/P, POL,
EPOL, CE.
Invalid
measurements
are
not displayed
by the
SI 128
7;
the
measurement
title
only is shown
followed
by a space.
3.6
JWS /
S1 1287
User Guide
/
Issue
AF