Fluke 6060B - Frequency Reference Control; Temperature Compensation; Modulation On;Off; Reverse Power Protector

THEORY
OF
OPERATION
I
I
I
L
The LEVEL
DAC is programmed
to zero.
2. The new
Attenuators are
programmed in
addition to the
old Attenuators.
3,
After a 5-ms
wait to allow
the
Attenuators
to settle, the
new
Attenuator
and
LEVEL DAC
settings are
programmed.
3-16.
Temperature
Compensation
The
temperature
compensation
DAC (TC DAC)
data is stored in
the
Generator
software
as a function
of the
output
frequency (Fo).
This data is
the same for each
Generator.
3-1
7.
Reverse Power
Protector
The
Reverse Power
Protector (RPP)
A2A5
protects the
Generator from
damaging
voltages
applied
to the RF
OUTPUT
connector. The
status line
RPTRPL
indicates
whether
the RPP
circuitry
has tripped.
If the RPP
trips, the RF
output is
programmed
off, and the RF
OFF indicator
flashes. The
RPP circuitry
is
reset by
the
operator
turning
the RF
OUTPUT on.
This
causes the
Controller to
reset the RPP by
toggling
RPRSTL,
and programming
the RF on.
3-18. Frequency
Reference
Control
•
r
i.
Programming of
the
frequency
reference
control
bits
depends
on the
setting
of
the
INT/EXT
reference switch as
well
as
whether the
High-Stability
Reference
or
the
Medium-Stability
Reference
option is
installed.
3-19. Frequency
Control
. .
The output
frequency (Fo) is
programmable
with
10-Hz
resolution.
The
nunimum
calibrated
output
frequency
is 0.01 MHz,
and the
maximum
calibrated
output
frequency
is
1050 MHz. The
filter and band
control bits
are
programmed
in five
bands and
are
determined by
the output
frequency (Fo),
For each band,
a
synthesizer
frequency
is
determined.
The
programming
data of
the
KV and KN
DACs are
calculated from
the
synthesizer
frequency
and the
instrument-specific
VCO
Calibration
EPROM
data. The
KV
DAC
settings
on the high
and low bands
are one
half
the
settings
on the
mid-band
to
compensate
for
the effective
doubling
of the
FM
deviation
that
occurs
on the
high
and
low bands.
3-20. Modulation
On/Off
The four
modulation modes
are:
Internal
AM
External AM
Internal
FM
External
FM
The
modulation
modes
can be
programmed
separately
or
in any
combination.
The
AM
depth
and FM
deviation DACs
are always
programmed
regardless
of
whether or
not
modulation is
enabled.
When
enabling
or disabling
modulation,
only
the
modulation
control
bits are
programmed.
Table
4D-17,
Modulation
ON/OFF
Control, lists
the
control
states
for each
modulation
choice.
3-21.
Modulation
Frequency
The two
internal
modulation
frequencies
of 400
Hz and 1000 Hz
are
programmed
with a
single control
bit MF400L.
Table
4D-18
Modulation
Frequency
Control
lists
the
MF400L
control
states.
3-5