Figure
3-26.
Precision
Q
Measurement
Setup
Operation
Procedure
1.
Turn
the
4285A
and
the
42851A
ON.
2.
T
o
perform
the
Precision
Q
measurement,
set
the
accessory
control
interface
to
the
Q
AD
APTER
mode
.
a.
Press
4
CA
T
ALOG/SYSTEM
5
and
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM
CONFIG
.
SY
STEM
CONFIG
page
will
be
displayed
b.
Move
the
CURSOR
to
the
CONFIG
eld.
NNNNNNNNNNNNNNNNNNNN
I
BIAS
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Q
ADAPTER
,
and
NNNNNNNNNNN
OFF
are
displayed.
c.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Q
ADAPTER
to
perform
a
precision
Q
measurement
using
the
resonant
measuring
method.
3.
Setup
the
4285A
measurement
conditions
by
lling
in
the
elds
on
the
MEAS
DISPLA
Y
page
.
4.
Set
FREQ
to
2.52
MHz.
(Other
functions
are
left
as
the
default
settings
.)
a.
Move
the
CURSOR
to
the
FREQ
eld.
The
default
measurement
frequency
,
1.0000
MHz ,
will
be
displayed
in
this
eld.
b.
Press
4
2
5 ,
4
.
5 ,
4
5
5 ,
and
4
2
5 .
2.52
will
be
displayed
on
the
system
message
line
,
and
the
softkey
labels
change
to
the
available
units
NNNNNNNNNNN
kHz
and
NNNNNNNNNNN
MHz
.
Press
NNNNNNNNNNN
MHz
.
2.5200MHz
will
be
displayed
on
the
FREQ
eld.
5.
P
erform
SHORT
correction.
SHORT
correction
is
required
to
compensate
for
the
residuals
of
the
42851A
internal
circuit
and
the
BNC
coaxial
cables
.
Connect
the
shorting
bar
furnished
to
the
42851A
between
HIGH
and
LOW
terminals
of
the
42851A
as
shown
in
Figure
3-27.
3-28
Basic
Measurement
Examples
