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Model
4342A
Section
V
Paragraphs
5-l
to
5-8
SECTION
V
MAINTENANCE
5-1.
INTRODUCTION.
5-2.
This
section
provides
the
instructions
and
information
required
to
maintain
the
HP
Model
4342A
Q Meter.
Included
are
Performance
Checks,
Adjustment
and
Calibration
Procedures,
Servicing
and
Troubleshooting
guides.
5-3.
TEST EQUIPMENT REQUIRED.
5-4.
The
equipment
required
to maintain
the
Model
4342A
are
listed
in
Table
S-l.
The
table
lists
the
type
of
equipment
to
be used,
the
performance
requirements
and
recommended
model.
If
the
recommended
model
is
not
available,
equipment
which
meets
or
exceeds
the
critical
performance
may be substituted.
5-5.
Q ACCURACY CONSIDERATIONS.
5-6.
A Q Meter
theoretically
measures
the
comprehensive
Q of
a circuit.
In practice,
residual
circuit
parameters,
which
do not
exist
in
ideal
circuits,
contribute
to meas-
ured
Q values.
Insertion
resistance,
residual
inductance
in
series
with
the
COIL
terminals,
Table 5-2.
Q Correlation
Factors.
30
MHz
1.17
45
MHz
1.37
* Correlation
Factor x Indicated
Q - Value on513/
518 = 4342A Indicated Q-Value.
Q voltmeter
input
conductance,
and
tuning
capacitor
loss
are
some of
the
factors
that
contribute
to
measurement
errors
in
the
prac-
tical
measurement
of
Q in
a typical
circuit.
These
errors
can
be minimized
by the
use
of
a
low
output
impedance
injection
transformer
system,
a low
loss
tuning
capacitor,
and
a Q
voltmeter
which
has
a low
input
conductance,
as in
the
Model
4342A.
Consequently,
the
4342A
will
indicate
higher
Q values
than
other
currently
available
Q meters.
By assuming
that
no
internal
circuit
loss
exists
in
the
Q Meter,
the
specified
Q ac-
curacy
can
be guaranteed
by performing
the
adjustment
and
calibration
procedures
in
this
section.
If
a Q calibration,
which
takes
the
actual
internal
loss
of
the
instrument
into
account
is
required,
a Q value
reading
check
with
Q standards
(inductors)
should
be done
in
addition
to
the
adjustment
and
calibration
procedures
described
in
paragraphs
5-9
and
those
which
follow.
At the
present
time,
no Q standards
are
available
for
users,
thus
a Q accuracy
check
with
Q standards
can
not
be performed
at
the
facility
where
the
instrument
is
used.
Since,
Hewlett-Packard,
however,
maintains
Q standards
traceable
to NBS (National
Bureau
of
Standards)
in
its
major
service
offices,
a calibration
service
with
authorized
Q standards
for
the
4342A
is
always
available.
If
a Q accuracy
check
is
needed,
contact
your
nearest
Hewlett-
Packard
office.
If
HP Models
513A/518A
Q
standards
are
owned
and maintained,
a Q ac-
curacy
check
for
the
4342A
can
be done
at
the
user's
location.
Refer
to
Table
5-2
for
Q
Correction
Factors.
5-7.
OPTION.
5-8.
The
calibration
and
adjustment
pro-
cedures
for
Option
001
instruments
(that
differ
from
the
standard
Model
4342A)
are
provided
in
paragraphs
5-25
and below.
5-1
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Troubleshooting
