Tektronix 465B User Manual

Options—
465B Service
Option
07
Inverter
Circuit
The
starting surge
is applied
to the
bases
of
Q1652,
Q1662. Q1654. and
Q1664 through T1631.
R1652, R1662.
R1654,
and R1664.
Since the transistors
do not have
identical
parameters,
one pair will
conduct before the
other
and will
start the inverter.
Operating base current
is
provided through
CR1643.
The
main frequency-determining
components for the
inverter
are R1626, R1631,
andT1631 primary
and secon-
dary windings.
Four base resistors
(R1652, R1662,
R1654,
and R1664) distribute
the drive
evenly between the
four
transistors.
C1652, C1662,
C1654 and
C1664 degenerate
the high frequency
response and reduce
transients.
Feedback
to maintain inverter
operation
is provided
from T1
4500
primary to
T1631 primary
through R1626,
R1631,
R1633, CR1632
and CR1634.
R1626 and R1631
provide
frequency
stability and current
limiting. R1633,
CR1632,
and
CR1634 compensate
for differences
in
transistors and components CR1632
and CR1634 con-
duct during different inverter half-cycles and
permit
R1633
to balance
the drive to T14500.
Capacitors C4503,
C4502, C4513,
C4517, and C4501
are added
to the secondary
of Tt4500 with
Option 07 to
provide
optimum
reduction of transients
during inverter
operation.
DC Input
External power
is
applied
through P1 1601. Diode
CR1601 is normally reverse biased If the wrong polarity
external power
is
applied,
CR1601 becomes forward
biased
and blows fuse F1 1601. A low-pass network
comprised
of
T1601,
C1601,
C1603,
and
C1609
acts as a
filter to reduce
transients to the
dc
source.
465B
Figure 6-10.
465B
Option
07
primary
winding.
6-26
REV
A SEP
1979

Tektronix 465B Specifications

General

Brand	Tektronix
Model	465B
Category	Test Equipment
Language	English