HP 6177B Operating And Service Manual

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Brand: HP

Category: Power Supply

Type: Operating and service manual for HP 6177B

Pages: 48

Download HP 6177B Operating and service manual

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48
changes
due
to
thermal
fluctuations.
If
the
user
expenences
difficulty
in
obtaining
adequate
sam-
pling
resistors,
it
is
recommendec.
that
he
obtain
duplicates
of
the
sampling
resistors
(Rl,
R2,
and
R3)
that
are
used
in
the
unit.
5-9
'Ine
monitoring
device
is
connected
across
the
sampling
resistors
as
shown
in
Figure
5-3,
As
indicated
in
this
illustration
neither
output
terminal
0:
the
power
supply
is
grounded
and
the
measuring
device
case
is
connected
to
the
junction
of
the
loa
a
ana
sampling
resistors.
This
arrangement
prevents
grounc
loop
paths
ane
shunt
current
paths.
Notice
that
shunt
resistance
paths
be-
tweer;
the
external
switches
and
ground
can
exist.
However,
since
the
shunt
resistance
appears
across
only
one
of
the
external
resistors
and
not
across
the
entire
output
termina.ls
of
the
supply,
the
performance
of
the
supply
is
no:
degraded.
5-10
RATED OUTPUT AND METER ACCURACY
5-11
Current.
To
check
the
output
current
for
all
three
ranges,
proceed
as
follows:
a.
Connect
test
setup
shown
in
Figure
5-3,
leaving
switch
32
open
throughout
test.
b.
Turn
VOLTAGE
control
fully
clockwise.
c,
Set
range
switch
on
iront
panel
to
high-
est
current
position
(500mA Mode1 6177
A,
or
250mA
Model
6181Al.
d.
Set
range
switch
31
on
external
test
set-
up
to
high
range
and
connect
+
terminal
of
differ-
ential
voltmeter
to
RS1.
e.
Set
front
panel
meter
switch
to
AMPS
and
adjust
CURRENT
control
until
iront
panel
meter
in-
dicates
exactly
the
maximum
rated
output
current
for
this
particular
range.
L
Differential
voltmeter
should
read
as
follows:
Model
Reading
61778
2.5
±O.
05Vdc
61818
1 ±Q. 02Vdc
If
it
does
not,
refer
to
adjustment
procedure
at
rear.
g. To
check
the
medium
current
range,
set
the
range
switches
on
the
front
panel
and
the
ex-
terna
1
test
setup
to
their
middle
position
and
dif-
ferential
voltmeter
to
Rsz.
Then,
repeat
Steps
e
and
f.
(Readings
of
Step
f
apply
to
every
current
range.)
h. To
~heck
the
low
current
range,
set
both
range
switches
to
the
low
current
position
a"'nd
re-
peat
Steps
e
and
f.
5-12
Voltaae.
To
check
the
output
voltage
pro-
ceed
as
follows:
a.
Connect
test
setup
of
Figure
5-3
except
connect
the
differential
voltmeter
between
the
guard
(tenninai
AO)
and
-
output
terminals
(see
Figure
3:-7
for
voltmeter
connections).
5-3
LOAD
POWER
Sl}PPL Y
RESISTORS
UNDER
TEST
lO
R
lo
? °
D--
-O~
~~
! I
I
~J
I
I
i
I
I
I
I
I
CURRENT
SAMPLING
I
RESISTORS
,
I
RS3
I
.~
I
lO
0
I MED
RS2
I
51
I
c~
RANGE
HI
0p
(MAK::-8EFOR::
- BREAK CONTACTS)
R5
I
) Y
DiFFERENTiA:...
VOLTMETER
U?
I
I
I
HIGH
MED!UM
I
lOW
RANGE
RANGE
RANGE
MODEL
NO.
I
RS2j
RL2
I
RS3
,
RSI
Rl1
RU
6177il
I
2D
98n
zon
i980ni
200n
9.8K
,
6t81B
I
jon
390nl
:0001 3.9K I
IK
39K
, ,
Figure
5-,3.
Output
Current
Test
Setup
b.
Set
range
switches
to
highe
st
current
positions
and
meter
switch
to
VOLTS
position.
c.
TUrn VOLTAGE
control
fully
clockwise
and
tum
on
supply
d.
Adjust
CURRENT
control
until
iront
panel
meter
indicates.
exactly
the
maximum
rated
output
voltage.
e.
Differential
voltmeter
should
indicate
the
maximum
rated
output
voltage
within
±2%.
If
it
does
not,
refer
to
adjustment
procedure
at
rear.
5-13
LOAD REGULATION
Definition:
The
change,
.0.IOUT
in
the
static
value
of
the
de
output
current
resulting
from a
change
in
load
resistance
from
short
circuit
to
a
value
Which
yields
maximum
rated
output
voltage.
5-14
To checr.:.
the
constant
current
load
regula-