HP 548A Service manual
A
ND
SERVICE
M
ANUA
AL
LOGIC
CLIP
l
HEWLETT
|hfi_,
PACKARD
CERTIFICATION
Hewlett-Packard
Company
certifies
that
this
instrument
met
its
published
specifications
at
the
time
of
shipment
from
the
factory.
Hewlett-Packard
Company
further
certifies
that
its
calibration
measure-
ments
are
traceable
to
the
United
States
National
Bureau
of
Standards,
to
the
extent
allowed
by
the
Bureau’s
calibration
facility,
and
to
the
calibration
facilities
of
other
International
Standards
Organi-
zation
members.
WARRANTY
AND
ASSISTANCE
This
Hewlett-Packard
product
is
warranted
against defects
in
materials
and
workmanship
for
a
period
of
one
year
from
the
date
of
shipment
except
that
in
the
case
of
certain
components
listed
in
Section
|
of
this
manual,
the
warranty
shall be
for
the
specified
period.
Hewlett-Packard
will,
at
its
option,
repair
or
replace
products
which
prove
to
be
defective
during
the
warranty
period
provided
they
are
returned
to
Hewlett-Packard,
and
provided
the
preventive
maintenance
procedures
in
this
manual
are
followed.
Repairs
necessitated
by
misuse
of
the
product
are not
covered
by
this
warranty.
NO
OTHER
WARRAN-
TIES
ARE
EXPRESSED
OR
IMPLIED,
INCLUDING,
BUT
NOT
LIMITED
TO,
ThHE
IMPLIED
WARRAN-
TIES
OF
MERCHANTABILITY
AND
FITNESS
FOR
A
PARTICULAR
PURPOSE.
HEWLETT-PACKARD
IS
NOT
LIABLE
FOR
CONSEQUENTIAL
DAMAGES.
If
this
product
is
sold
as
part
of
a
Hewlett-Packard
integrated
instrument
system,
the
above
warranty
shall
not
be
applicable,
and
this
product
shall
be
covered
only
by
the
system
warranty.
Service
contracts
or
customer
assistance
agreements
are
available
for
Hewlett-Packard
products.
For
any
assistance,
contact
your
nearest
Hewlett-Packard
Sales
and
Service
Office.
Addresses
are
pro-
vided
at
the
back
of
this
manual.
010000-A~238
OPERATING
AND
SERVICE
MANUAL
LOGIC
CLIP
548A
548A
LOGIC
CLIP
INSTRUCTIONS
Printed:
JUN
1977
Manual
Part
No.
00548-90009
Microfiche
Part
No.
00548-90010
Printed
in
U.S.A.
Page
0
Model
548A
AUXILIARY
POWER
CONNECTOR
CAUTION
The
30
volts
maximum
input
to
the
548A
Logic
Clip
is
an
absolute
value
which
must
not
be
exceeded.
Any
application
of
a
dc
voltage
or
a
pulse
greater
than
30
volts
may
cause
permanent
damage
not
cov-
ered
by
warranty.
No
damge
will
occur
if
the
548A
is
clipped
directly
to
an
integrated
e
T
circuit
with
dc
voltages
up
to
30
volts
P
—
if
the
clip
is
removed
within
1
minute.
|
Test
leads
should
not
be
used
to
make
connections
to
the
548A
if
there
is
any
possibility
of
encoun-
tering
a
voltage
greater
than
18
volts
dc.
Test
lead
inductance
may
cause
noise
spikes
or
pulses
in
excess
of
30
volts
and
permanently
damage
the
logic
clip.
Figure
1.
HP
Model
548A
Logic
Clip
Model
548A
Page
1
APPLICATION
The
548A
Logic
Clip
light-emitting-diodes
(LED’s)
will
indicate
logic
levels
on
most
integrated
circuit
(IC)
logic
families,
including
TTL,
HTL, DTL,
CMQOS,
and
NMOS.
It
displays,
simultaneously,
logic
levels
for
all
8,
14
or
16
pins
of
a
dual
in-line
IC
which
operates
from
a
supply
of
4
to
18
volts.
The
clip
can
test
flip-flops,
gates,
counters,
buffers,
adders,
and
shift
registers.
All
16
input
gates
are
electronically
buffered
to
minimize
loading
on
any
IC
being
tested.
Sixteen
high-efficiency
LED’s
provide
HIGH
(LED
on)
and
LOW
(LED
off)
logic
level
indication.
No
power
supply
connections
are
necessary;
the
Logic
Clip
powers
itself
from
the
V.
and
ground
pins
of
the
IC
under
test.
NOTE:
Accidental
connection
of
up
to
+30
volts
on
548A
clip
pins
for
a
minute
will
not
damage
548A
circuits.
SPECIFICATIONS
Input
Protection:
30V
absolute
maximum
for
one minute.
Input
Current:
=15
uA
maximum
over
the
range
of
+0.5V
to
Vsupply
-
0-5V.
Supply
Voltage:
4
to
18V
across
any
two
pins.
Supply
Current:
50
mA
maximum
with
15
LED’s
on.
Auxiliary
Positive
Supply
Voltage:
+4.5
to
+20V
applied
to
connector
on
top
of
clip
(ground
supplied
by
IC
under
test).
Supply
must
be
at
least
1.5V
more
positive
than
any
pin
on
IC
under
test
to
prevent
drawing
power
from
the
IC.
Input
Threshold
Voltage
Range:
V55|,
x
(0.4
+
0.06).
Example:
at
+5Vgypply
LED’s
will
be
off
below
1.7V
and
on
above
2.3V.
Logic
Family
Compatibility:
DTL,
TTL,
HTL,
CMOS
and
NMOS
in
dual
in-line
packages
up
to
16
pins.
Operating
Temperature
Range:
0
to
55°C.
Indications:
LED
Indication
On
Pin
voltage
above
threshold
or
no
connection
(open)
Off
Pin
voltage
below
threshold
Dim
Pin
voltage
pulsating
Page
2
Model
548A
OPERATION
(See
Photo)
Squeeze
the
Logic
Clip
to
open
the
contact
jaws
and
place
the
clip
on
the
pins
of
the
IC
to
be
tested.
Pin-to-pin
contact
must
be
good.
The
LED’s
will
indicate
the
logic
level
(LED
on
=
logic
HIGH
and
LED
off
=
logic
LOW)
on
the
corresponding
IC
pin.
There
are
no
operating
controls
or
service
adjustments
on
the
clip.
OPERATION
WITH
AUXILIARY
POWER
SUPPLY
If
the
IC’s
being
tested
use
low
voltage
(below
4V)
or
if
power
may
not
be
drawn
from
circuit
under
test,
an
external
voltage
applied
to
the
548A
top
terminal
(see
photo)
allows
complete
use
of
the
clip.
Refer
to
the
“Specifications”
for
details.
An
auxiliary
power
cable
is
supplied
with
the
clip.
NOTE:
Input
threshold
with
auxiliary
power
supply
is
nominally
0.4
x
(Vgypply
-
0.8).
TESTING
If
faulty
operation
of
the
Logic
Clip
is
suspected,
each
pin
network
should
be
tested.
A
4
to
18
volt
supply
can
be
used
to
check
for
correct
operation.
With
the
supply
connected
across
any
two
pins,
the
V¢
LED
and
the
remaining
14
LED’s
should
light.
Ground
each
pin
separately
(except
the
V.
LED),
and
each
LED,
when
that
pin
is
grounded,
should
go
off.
A
separate
adjustable
voltage
power
supply
can
be
used
to
check
the
threshold
voltage
of
each
Logic
Clip
pin.
Test
leads
can
be
used
for
testing
provided
the
applied
voltage
does
not
exceed
18V
dc
maximum.
The
threshold
voltage
which
will
switch
one
LED
on
is
variable,
and
it
depends
on
the
IC
supply
voltage.
See
the
specifications.
Test
the
threshold
by
applying
a
steady
monitored
supply
voltage
to
a
pair
of
548A
pins
(e.g.,
+5
volts),
and
connect
a
monitored
variable
threshold
test
voltage
to
each
LED
pin
to
be
tested.
Increase
the
test
voltage
from
zero
and
note
the
threshold
voltage
(e.g.,
1.7
to
2.3
volts)
for
each
LED.
MAINTENANCE
The
Logic
Clip
internal
electronics
assembly
is
a
single
molded
part
and
is
not
repairable.
To
obtain
other
replace-
ment
parts,
address
inquiry
to
the
nearest
Hewlett-Packard
Sales
and
Service
Office.
Give
Logic
Clip
model
number
and
identify
parts
by
description.
HEWLETT-PACKARD
SALES
AND
SERVICE
OFFICES
To
obtain
servicing
information
and
order
replacement
parts,
contact
the
nearest
Hewlett-Packard
Sales
and
Service
Office
in
HP
Catalog,
or
contact
the
nearest
regional
office.
IN
THE
UNITED
STATES:
CALIFORNIA
3939
Lankershim
Blvd.
North
Hollywood
91604
GEORGIA
P.O.
Box
28234
450
Interstate
North
Atlanta
30328
ILLINOIS
5500
Howard
Street
Skokie
60076
NEW
JERSEY
W.
120
Century
Road
Paramus
07652
IN
CANADA:
QUEBEC
Hewlett-Packard
(Canada)
Ltd.
275
Hymus
Blvd.
Pointe
Claire
IN
EUROPE:
SWITZERLAND
Hewlett-Packard
(Schweiz)
AG
Rue
du
Bois-du-Lan
7
P.O.
Box
85
CH-1217
Meyrin
2
Geneva
IN
AFRICA,
ASIA,
AND
AUSTRALIA:
Hewlett-Packard
Intercontinental
3200
Hillview
Ave.
Palo
Alto,
California
94304
IN
CENTRAL
AND
SOUTH
AMERICA:
Hewlett-Packard
Intercontinental
3200
Hillview
Ave.
Palo
Alto,
California
94304
MARUAL
CHANGES
CHANGE
DATE:
Moy
5,
1983
MANUAL
DESCRIPTION
This
chonge
aupersedes
nll
ecarlier
EEEEREEEEEEEEEEEEEE
doted
changea,
®
INSTRUMENT:
518A
Logle
Clip
¥
.
Operating
and
Service
Monunl
*
#8%
Moke
all
changes
listed
as
"
"
ERRATA,
’
'
g
.
*
SERIAL
PREFIX:
None
'
.
0
*
DATE
PRINTED:t
JUN
1976
’
"
4P
PART
NO:
00548-90009
:
®
NICROFICHE
KOt
005/8-90010
.
N
EEEEREEEEEEE
NN
¢
INDICATES
NEW
OR
REVISED
ITEM
>
INDICATES
ACTION
TG
BE
TAKEN,
ERRATA
Page
|,
Specificutionst
>Change
"Input
Voltoge
Limit"
to
the
followling:
Input
Protection:
30V
asbsolute
maximum
for
1
minute,
>Change
"50
mA"
for
supply
current
to
"55
mAM,
Page
2,
Testing:
YAdd
the
following
sentence
at
the
end
of
the
[irst
paragraph
under
Testing
hend}
"Test
leads
caon
be
used
for
testing
provided
the
applied
voltage
does
not
exceced
18Y
dc
moximum,"
(é]
HEWLETT
P8
PACKARD
MANUAL
CHANGES
MODEL
%484
(00548-90009)
Page
&
Insert
this
Warning
nfter
the
Certificntfon/Warranty
and
Assistonce
which
is
on
the
inside
{'ront
cover,
WARN
ING
This
product
should
be
connected
to
o
power
source
that
is
sufficiently
isolnted
from
the
main
supply
to
prevent
the
risk
of
elnctriec
shack,
To
further
reduce
the
risk
of
eleastric
shock,
refer
to
the
service
manunl
for
the
equipment
under
test
(when
applicable)
nnd
follow
the
manufacturer's
service
and
snfety
precautions
particularly
when
voltoges
exceeding
30
VAMS
or
50°
VDC
are
present,
)
PACKARD
ai
Printed
in
U.S.A.
HEWLETT
|
Manual
Part
No.
00548-90009
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