Solartron 1287 - Drift Corr; Averaging

[sync.]
Synchronized measurement triggering
is selected when the DVMs
measure
only during
the actual sweep segments, not during sweep initialization
or delay,
etc.
During
a
ramp
sweep the DVMs measure continuously,
at a rate determined
by
the
measurement resolution.
During a stepped sweep a measurement is
made at each
voltage
level within
the
sweep. Each, measurement is made
as
late
as possible, to give
the cell the
maximum settling time. Any
drift correction (see Section
7.4)
is made just after
the measurement and is applied before the result
is output.
Should the requested
sweep step time be too short
for the DVMs to complete
a
measurement
within each step, then an error
code is made available for
output
and the original step time is retained.
The remedy is either to select parameters
that will increase the
measurement
rate, or
to
increase
the step time. See Section 8.8 for
details of minimum
step
time versus the
measurement resolution.
Problems may also arise if
a GPIB controller, or peripheral
equipment,
is
being
used which operates too slowly for the
chosen sweep step time.
Eg. the
controller cannot process
a
DVM
measurement.
7.4
{DRIFT CORR.}
>
> Remote
command is DC/. Refer
to
Chapter
4,
Section 6.16.
With drift correct
is switched [on], correction is
applied
every
ten seconds to the
DVM(s)
presently engaged in measuring. For
the
voltage
measuring DVM,
correction is applied only
to the
particular
range(s) in use. With drift
correct [off]
is selected,
correction is no longer applied.
In either case,
a drift correction is performed automatically whenever
a greater
reading precision
is selected or a DVM range is changed.
7.5
{AVERAGING}
> >
Remote command is AVI. Refer
to
Chapter
4,
Section 6.
1
6.
With averaging is switched
[on] the DVM results are output
as a cumulative
arithmetic mean.
The mean value develops over the
first ten measurements and
thereafter is output, once per measurement
cycle, as a running mean
of the last ten
results. (This is sometimes known
as "walking window" averaging.)
JWS /
SI1287
User
Guide / issue AF
3.19