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HP 437B Service Manual

HP 437B
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$0394
.
15,128
+1
5g
——
oF
ama
Digital
Board
Check
HP
437B
Service
Sheet
BD1
5.
Calculate
the
difference
between
the
absolute
values
of
the
-15.0V
and
10.
11.
12.
+15.0V
power
supplies.
The
difference
must
be
no
greater
than
+2.00%
(-300
mV
to
+300
mV).
/3<06%
(Absolute
value
of
-15.0V)
~_1494(___
(Absolute
value
of
+15.0V)
21/4
(-300mV
<
calculated
value
<
+300mV)
(at
If
any
of
the
voltages
do
not
meet
the
specification,
go
to
Service
Sheet
A3d
to
troubleshoot
the
power
supply.
Disconnect
the
DVM
from
the
Power
Meter.
Set
the
oscilloscope
as
follows:
Vertical
Sensitivity
..........
ccc
cc
ccc
eee
e
ence
eevee
10
mV/div
SWECD!
padre
teks
betcas
ecothaadadia
teaeanaaantes
5
ms/div
S/div
TTTIS
BOLING.
owsceeeien
Dao
Hes
oa
as
ins
eeeum
aoe
ines
internal
Coupling?
6iseein
och
a
aes:
doradleasavedethan
Seats si
elexes
AC
Connect
the
ground
lead
of
the
oscilloscope
to
J3
pin
8
(DGND).
Connect
the
oscilloscope
probe
to
J3
pin
7
(+5
REG)
and
observe
the
waveform.
Ripple
on
the
power
supply
should
be
less
than
+5
mV.
Repeat
steps
9
and
10
for
J3
pin
6
(-1S
REG)
and
J3
pin
5
(+15
REG).
If
the
amount
of
ripple
on
the
power
supply
is
not
within
the
specification,
go
to
Service
Sheet
A3d
to
troubleshoot
the
power
supply.
When
the
LINE
switch
is
set
to
ON,
the
Digital
Board
runs
a
series
of
self
tests
to
check
for
possible
failures.
If
the
Digital
and
Analog
boards
pass
the
self
tests,
the
display
will
read
"SELF
TEST
OK".
If
the
Digital
or
Analog
boards
do
not
pass
one
of
the
self
tests,
the
front
panel
will
display
one
or
more
error
codes.
In
case
the
display
is
inoperative,
the
service
LEDs
will
indicate
the
error
code
by
(a)
blinking
LED
|
rapidly,
and
(b)
displaying
the
error
code
of
the
failed
test
on
LEDs
2
through
8.
To
invoke
the
self-tests
(and
set
the
meter
to
display
all
errors):
1.
2.
Set
the
LINE
switch
to
STBY.
Set
the
switches
in
A3S4
to
the
following
positions:
Noni
die
sf
$7
=
ON
a
S6
=
OFF
a
S5
=
OFF
a
S4
=
ON
a
S3
=
OFF
S2
=
OFF
os
S1
=
OFF
en
SERVICE
8-23

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HP 437B Specifications

General IconGeneral
BrandHP
Model437B
CategoryMeasuring Instruments
LanguageEnglish

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