Service Special Functions; Status Signals - Fluke 6060B Instruction Manual

THEORY OF
OPERATION
Test
5.
Each
memory
location of the
Non-Volatile
RAM
is
checked with a
checksum.
Test
6.
The
low-pass
filters
on
the
Output assembly
are tested
by
setting
the
frequency
at
the
top of each of the four half^octave
non-HET
bands and
verifying that the
output
is
leveled.
Then,
the
frequency
is
set
above
the
cutoff frequency,
and
the
output
is
checked
to see
if
the output
is
unleveled.
Test
7.
The
synthesizer
operation
is
verified
by programming
the
Generator
to
a
normal
operating frequency
and
checking to see that the
instrument
is
locked.
The Generator
is
then
programmed
to a synthesizer frequency
below
225
MHz
and then
above
550
MHz
and
is
checked
to see that the
instrument
becomes unlocked.
Finally,
all
frequency reference circuitry
is
turned off
and
checked to see that the
Generator
becomes
unlocked.
Test
8.
The
Generator
PLL
operation
is
verified
by forcing
a
large
change
in
frequency.
When
this
is
done,
the
Generator should
become
unlocked
and
then lock again.
Test
9,
Frequency modulation
is
verified
by overmodulating
the
carrier
and
then
checking the
unlocked
indicator.
This
is
done
by
programming
internal
FM
on and programming
the
KV
DAC
to
a higher than normal
value.
Test
10.
Amplitude modulation
is
verified
by
overmodulating
the
carrier
and then
checking
the
unleveled
indicator.
This
is
done by programming
a high
output
level
and programming
INT
AM
on
with a high
AM
depth.
3-26.
Service Special Functions
There are
two
special
function
self tests
for the front panel
indicators
and
keys.
These
special
function self tests
are described in
the following:
1.
The
front
panel displays are
checked
any
time by pressing the
[SPCL]
[0][3]
keys.
When
this
is
done
the
microprocessor
lights all
display
segments. This
test
is
terminated
by
pressing
any key
on
the instrument.
2.
Check
the
normally
open
front panel keys
by
pressing the
[SPCL]
[0][4]
keys.
Now,
each key
pressed has
its
row and column address displayed
in
the center of
the
FREQUENCY
display
field.
The
special
function
is
exited
by pressing the
[CLR/LCL]
key.
3-27. Status Signals
Five
status signals indicate the
Generator option complement, and these
status bits
are
interrogated at
power-on
self test
as follows:
HSOPTL
=
0
indicates
Option
-130 High-Stability Reference
is
installed.
MSREFL
=
0
indicates
Option -132 Medium-Stability Reference
is
installed.
lEINL
=
0
indicates
Option -488
IEEE-488
Interface
is
installed.
LRFML
=
0 indicates the
Option
-651
Low-Rate
FM
is
installed.
3-7