Detailed Circuit Descriptions - Fluke 6060B Instruction Manual

THEORY OF
OPERATION
ROPTL
=
0
indicates
Option
-830
rear panel
RF OUTPUT
and
MOD
IN
connectors
is
installed.
The
status of the rear panel
REF
EXT/
INT
reference switch
is
continuously monitored
with the
EXREFL
bit.
The
slate
of
this bit
is
used
by
the Controller
to display the
'F.XTREF
indicator
on
the front panel
and
to
program
the reference source.
The
RF
output of
the
Generator
is
considered
calibrated
whenever
the
'UNCAi;
indicator
is
off.
The
'UNCAL'
indicator
is lit,
but not flashing, whenever
the calibrated
limit
of the
Generator
is
exceeded.
However,
the
RF
output
is still
considered
usable.
The
"UNCAL'
indicator flashes
when
the
output
of the instrument
is
considered
unusable. This
is
the
result of a severe overrange condition
or
when
one of the following
analog
status signals becomes
active.
RPTRPL
=
0
indicates that the
RPP
circuitry
has tripped.
If this
occurs, the
RF
output
is
programmed
off to
provide additional protection
to
the instrument. The 'RF OFF'
and 'UNCAL'
indicators flash to
indicate that
RPP
has
tripped.
UNLOKL =
0
indicates
one
of several conditions.
The
Synthesizer or the
reference
circuits could be out-ofdock.
If
FM
is
on,
it
could indicate
FM
over-modulation. The 'UNCAL'
indicator flashes for any
of
these circumstances.
UNLVLL
=
0
indicates that the output
is
unleveled.
This could
also be the
result
of
amplitude over-modulation.
With
this condition, the
'UNCAL'
indicator Hashes.
3-28.
DETAILED CIRCUIT DESCRIPTIONS
This
section contains
the detailed
circuit descriptions for the
following assemblies:
A1
Front
Section
AIAI
Display Assembly
A1A2
Switch Assembly
A2
Module
Section
A2A1
Synthesizer
Assembly
A2A2
VCO
Assembly
A2A4
Output Assembly
A2A5
Attenuator/
RPP
Assembly
A2A7
Controller Assembly
A2A8 Non
Volatile
Memory
Assembly
A3
Rear
Section
A3A1
Power
Supply Assembly
3-29.
FRONT
SECTION,
A1
The
Generator
front section,
Al,
consists of
the
Display
PCA
AlAl,
the Switch
PCA
AI
A2,
and
the
Elastomer switches mounted
in
a
sheet metal housing.
The
front section
also includes the
display
lens,
the
POWER
ON/OFF
switch,
and
the
MOD
INPUT
connector.
3-8