Philips PM 6303 - 3.4.2. Component Connection; 3.4.3. Compensation of the Zero-Capacitance; 3.4.4. RCL AUTO, parameter menu

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