Regulator; Power Supplies - HP 8340B Manual
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A52 POSITIVE REGULATOR
The
A52
positive regulator contains circuitry for the:
+20V
supply
+12V
supply
+5.2V
supply
Voltage accuracy sensing
circuitry
ON/STANDBY
and
SHUTDOWN
functions
The
+20V
supply
is
a
self-starting regulator, with
a
precision reference to accurately set the output
voltage. With the exception of the independent
+22V
standby supply (see the A35 assembly),
all
supplies are
dependent
on the
+20V
output.
NOTE:
The
+20
and
+5.2V
supplies are critical, low noise supplies with
a
specified periodic and
random deviation (PARD) less than 100
nV peak. The
+12V
supply
is
non-critical, with
a
specified
PARD
less than
5
mV peak.
ASS
NEGATIVE REGULATOR
The A53
assembly contains
all
circuitry
for the —10V, —5.2V, and —40V power
supplies,
as well
as
voltage sensing circuitry to flag the A52 positive regulator assembly
if
one of these supplies
goes
out
of tolerance.
NOTE:
The
—10 and
—40V
supplies
are
critical,
low-noise supplies. They are
limited to
a
periodic
and random deviation (PARD) of less than 100
nV
peak.
The —5.2V
supply
is
primarily
a
digital
(ECL)
supply, and
has
a
PARD specification of
5mV.
A56
-15V
REGULATOR
The A56 assembly
contains the —15V regulator and voltage sense circuitry
to flag
the A52 positive
regulator
if
an out-of-tolerance condition occurs
in
the supply.
POWER SUPPLIES
The 20V secondary
is
rectified and used by both the
+20
and
+22V
regulators.
The
+22V
supply
is
used for things that require
power when the
instrument
is in
standby (the 10
MHz
standard oven,
standby relay, and
memory backup).
+20V
is
used
to:
•
Power the reference oscillator supply.
•
Power
the+12V
supply.
•
Provide
a
reference voltage for the
+5.2,
—10, and
—40V supplies.
The —10V supply
powers
the —5.2V supply.
The —40V supply
powers
the —15V supply.
1-4
Power Supplies/Fan
Theory
of Operation
HP 8340B/41B
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