HP 6177B Operating And Service Manual
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tion
for
all
three
output
ranges
proceed
as
follows:
2.
Connect
test
setup
shown
in
Figure
5-3.
D,
Turn
VOLTAGE
control
fully
clockwise,
Set
imernal
and
ezternal
range
switches
to
highest
curren:
positions.
Connect
+
side
of
differential
voltmeter
to
Rsl.
'-.
Set
meter
switch
to
AMPS
anc
adjust
CURRENT
control
until
front
pane
1
mete:"
reads
ex-
actly'
the
maximuIT:
rated
outPUt
current.
e.
Read
end
record
voltage
indicated
on
differenT_iel
volt:l~eter.
l.
Shon
o...:t
load
resiSlor
(R::..l)
by
closing
switch
S2.
g.
Reaoinr;
on
differential
voltmeter
should
not
vary
from
reeding
recorcied
in
Step
e
by
more
than
the
following:
Model
No.
Variatio:l
(U'I"0C)
Gl77B
=30
61B1B
=75
h.
To
check
the
load
regulation
for
the
mid-
dle
current
range,
open
shorting
switch
82
and
set
range
switches
on
front
panel
and
external
test
setup
to
their
middle
position.
Connect
differen-
tial
voltmete:-
te
;:;'S2.
L
Next,
repeat
Steps
d
through
g.
Varia-
tion
should
not
exceed
the
reading
of
Step
g.
j.
To
check
the
load
regulation
for
the
low-
es:
current
range,
open
switch
82
and
set
both
range
switches
to
their
low
current
position.
Then
repeat
Steps
d
through
g.
5-15
LINE
REGULATION
Definition:
The
change,
LIOUT
in
the
static
value
of
dc
output
cur-
rent
resulting
from
a
change
in
ac
input
voltage
over
the
specified
range
irom
low
line
(usually
103
Volts)
to
high
line
(usually
127
Volts),
or
from
high
line
to
low
line.
5-16
To
check
tloe
constant
current
line
regulation
for
all
three
ranges
proceec
as
follows:
a.
Utilize
test
setup
shown
in
Figure
5-3.
except
connect
variable
auto-transformer
between
input
power
source
and
power
input
to
supply.
Leave
switch
S2
open
throughout
test.
b.
Turn
VOLTAGE
control
fully
clockwise.
c.'
Set
range
switches
on
front
panel
and
external
test
set:
...
rp
to
highest
current
positions
and
connect
+
lead
of
differential
voltmeter
to
RSI''l'>
d.
Set
meter
switch
to
AMPS
and
adjust
auto
transformer
for
10
3Vac
input.
e.
Adjust
CURRENT
control
for
maximum
rated
output
current
on
front
panel
meter.
f.
Read
and
record
voltage
indicated
on
dif-
ferential
voltmeter.
g.
Adjust
auto
transformer
for
1 27Vac
input.
h.
Reading
on
differential
voltmeter
should
not
vary
from
reading
recorded
in
Step
f
by
more
5-4
than
the
following:
Model
No.
Vanatior:
(f.lVdc)
6177B
=.:25
61B1E
±63
J..
To
check
line
regulation
for
medium
cur-
ren~
renge
5e:
both
range
switches
to
their
middle
position
ano
connect
differential
voltmeter
to
RS2'
j...
Next
repeat
Steps
d
through
h.
Varia-
tion
should
no'c
exceed
the
reading
of
Step
h.
l:. Fo:-
the
lowest
cu:-rent
range,
set
Doth
range
sWhches
to
the
appropriete
positions
and
repeat
Ste!)s
d
through
h.
,-17
RIPPLE AND NOISE
Definition:
The
residual
ac
CUTTent
\'\'hich
is
superimposed
on
the
dc
output
current
0:
a
regulated
supply.
Ripple
e.nci
r:oise
may
be
specified
anc
measured
in
terms
0:
its
RMS
or
(preferably)
peak-to-peak
value.
5-18
RMS
Measurement.
To
check
the
rms
ripple
and
noise,
proceed
as
follows:
a.
Use
test
setup
of
?igure
5-3,
except
connec:
ac
voltmeter
across
sampling
resistors
in-
stead
of
differential
voltmeter.
Ensure
that
power
supply
output
is
floating
to
avoid
ground
loops.
NOTE
To
prevent
extraneous
60Hz
pickup,
the
externa
1
range
switch
and
loa
d
re-
sistors
(RL
and
RS)
should
be
enclosed
in
c
shielded
box.
Also.
the
sampling
leads
connected
to
the
ac
meter
shou1ci
be
twisted
or
shielded.
b.
Rotate
VOLTAGE
control
fully
clockwise.
c.
Set
range
switches
to
highest
current
range.
Connect
+
side
of
ac
voltmeter
to
RSI-
C.
Set
meter
switch
to
AMPS
and
adjust
CURRENT
control
until
front
panel
meter
indicates
exactly
the
maximum
rated
output
current.
e.
The
ac
voltmeter
should
read
less
than
the
following:
Model
No.
Reading
6177B
80J-lV
rms
61818
200!'-V
rms
f.
To
check
ripple
and
noise
for
the
medium
and
low
current
ranges,
set
both
range
switches
to
their
appropriate
positions,
and
ac
voltmeter
to
appropriate
current
sampling
resistor.
Then
repeat
Steps
d
and
e.
5-19
Hiah
Freguencv
NOise
Measurement.
VJhen
measuring
high
frequency
noise,
an
oscilloscope
of
sufficient
bandwidth
(up
to
ZOMHz)
must
be
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