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E
3-4
3.4,2.
Component
Connection,
see
Fig.
32-36
By means
of the supplied 2-terminai
test
fixture
common
components
are
connected.
For
precise results
low-ohmic
impedances
should
be
measured
applying
4
-wire
system. For
this
a
4-wire
test
cable
with
Kelvin
clamps (PM 9541)
and
the
RCL
adapter
(PM
9542)
are
optional
available
as
well
as
the
test
fixture
PM
9542
SMD
for
measurements
of
SMD
components
(Surface
Mounted
Devices).
Furthermore
it
is
possible to
connect
components
to
the 4
mm
input sockets
of the
RCL
meter
via
single
line
cables.
When
measuring high-ohmic
CUTs
the
zero-capacitance
must
be considered.
If
screened cables
(single
screened
wires) are
used
to
reduce
additional zero-capacitance the screens
must
be connected
to
the
GUARD.
ATTENTION:
Capacitors with
high
residual
charge
(> 5 V)
must
be
discharged before connecting
to
the
measuring
input.
3.4.3.
Compensation
of
the
Zero-Capacitance
When
measuring high-ohmic
components
the
indicated
zero-capacitance
must
be taken
into
account
or
compensated by
Co
TRIM:
-
Apply
appropriate
test fixture
or
test
adapter
without
CUT
to
the
instrument.
—
Select
"Cp
or
Lp" by
the
step
buttons
V
or
A
.
—
Adjust
trimmer
Co
TRIM
by
screwdriver
for 0.0
pF
display.
On
adjustments
<
0.0
pF
overrange
is
indicated.
If
Co
TRIM
is
turned
more
clockwise an inductance
(kH)
may
be
displayed.
3.4.4.
RCL AUTO,
parameter
menu
RCL
AUTO
is
the default
mode
of the instrument
after
POWER
ON.
If
necessary,
perform
compen-
sation of
the zero-capacitance
by
Co
TRIM
according
to
chapter
3.4.3.
In this
RCL
AUTO
mode
the numerical
value
and dimension
of the
dominating
component
of the
CUT
are
displayed.
In
addition the appropriate
equivalent-circuit
symbol
is
indicated.
Q
=
D
=
1
is
the
deci-
sion
threshold of the
RCL
meter
for defining the
dominating
component,
see
Fig. 5.
It
must be
noticed
that
Q
and
D
are related to
the instruments'
internal
1
kHz
test
frequency.
G-500
D-0002
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