2.4
[INPUT I]
Parameters
of the analyzer
CURRENT
input.
2.4.1
RANGE
Auto ranging or
a fixed, range can
be
used:
•
[auto]
Auto
ranging selects the most accurate
range
for the signal amplitude
being
measured. Each measurement
starts
on the most sensitive
range.
If an
overload is detected the
result is
discarded and
measurement
restarts
on the
next
range up; this
procedure
is continued until a
valid
result
is obtained.
Auto
ranging
should
be used
when the input
signal amplitudes
cover more
than one
range, or are
unpredictable.
•
[6pA] to
[60mA]
A
fixed
range
provides for the measurement
of signal amplitudes
in the
range:
0A to 6pA,
0A to
60pA,
0A to
600pA,
0A to 6mA,
0A
to
60mA,
The use of a
fixed range
avoids the range
search time penalty
incurred
with auto
ranging. Select the
most sensitive
range possible, to obtain the
finest
measurement resolution.
2.4.2 COUPLING
Coupling of the measured
signal to
the analyzer
CURRENT input.
• [dc]
Dc
coupling introduces
minimum phase
shift and
should
be used
whenever possible, particularly
on low frequency
work.
• [ac]
Ac coupling can be used to
reject an
unwanted dc
component. This may
allow
a
more sensitive
input range to be
selected.
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