BK Precision 1405 User Manual

\,
SENVICE
HINIS
IODIFICAITON
TO ADD
SCHEiIAIIC
DfiASI
RETBACE
BLANKING SYIIBOL
DESCRIPNON
PART
The
Model 1403A and
1405
Oseilloseopes
do
C131
0.1
HF,
2
kV
not inelude eireuitry
to
blank
the
eleetron
Capaeitor
.
.
. . .
. 024'006-9
beam during
retraee
of
the sweep.
At
brighter
intensity settings,
retraee
may be visible.
Q118
2SC1507
NPN
This
is not objeetionable
to most users,
and Transistor
. . .
. . o
1?6'055-!
helps to reduce
the eost
of
the
instrument.
R158
100 kn
t10%,
l/2 W
However,
if visible
retraee
is
eonsidered
Resistor..o.....
002'102-6
objeetionable,
a retraee
blanking eireuit
may
be
added.
A
sehematie
diagram
of the eireuit R172
680
kn
t10%,
L/2 W
is shown below.
The standard
eireuit board
is Resistor....
o.. o
002-102-f
designed
to aeeept
this eireuit
on a
drop-in
basis, and the
eireuit
board
legend
identifies
R173
1
kO
t10%,
l/2
W
the
proper
loeation
for eaeh
of the added
Resistor.r.ror.o
002-102-t
parts.
A
parts
list
for
the
retraee
blanking
eireuit
follows:
R174
22
kn
t10%'
2
W
Resistor.
o o . .
. r .
011-003'5'223
x65
-il20
-
OO
--\.
/
+l7OV
\
/
Rl72
/
680K
1/2W
\
if
:iil.
Qil8
2SCt507
R173
IK
t/?w
./
./
^,u4^
CHANGE
FROM
47K,
l/2W
TO
tooK,
l/2w
T_
I
t-
netnacE
BLANKII{G
CIRCUIT
NOTE:
PCB IS
DESIGNED
TO
ACCEPT
THESE
PARTS
Modifieation
to Add
Retraee
Blanking.
33

BK Precision 1405 Specifications

General

Brand	BK Precision
Model	1405
Category	Test Equipment
Language	English