HP 6177B Operating And Service Manual
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p-p
(Model
6177B)
or
40mV
p-p
(Model
6l8lB),
8.
Se';:
range
switches
to
medium
range
and
adjust
fo:-
rated
output
current
0:
that
range.
Observec
noise
shotile
be
less
than
40mV
p-p
(Mociel
G177B)
or
32mV
p-p
(Mociel
SlSlE).
g.
S8:
range
switches
to
lowest
range
and
adjus:
for
ralec
output
curren:
of
low
range.
h.
ODse:-ved
noise
should
be
less
than
50mV
p-p
(Model
6177B)
or
20mV
p-p
(Model
6181B).
5-24
LOAD TH.hNSIENT
RLCOVER'::.-
TIME
Definition:
The
time
"X"
for
output
current
recovery
to
within
"Y"
mil-
liamps
of
the
nomina
1
output current
following
a liZ"
amp
stet:
change
in
load
voltage
-
where:
"Y"
is
generally
of
the
Seme
order
as
the
load
regulation
specification.
The
nOC1inal
output
cuaen!
is
defined
as
the
de
level
half
way
between
the
static
output
current
before
and
after
the
imposed
load
change,
and
uz"
is
the
specified
load
voltage
change,
normally
equal
to
the
full
load
voltage
rating
of
the
supply.
5-25
Transient
recovery
time
may
be
measured
at
any
input
line
voltage
combined
with
any
output
voltage
and
load
current
within
rating.
5-26
Reasonable
care
must
be
taken
in
switching
,the
load
resistance
on
and
off.
A
hano-operateci
switch
in
series
with
the
load
is
not
adequate,
since
the
resulting
one-shot
displays
are
difficult
to
observe
on
most
oscilloscopes,
and
the
arc
energy
occurring
during
switching
action
complete-
ly
masks
the
display
with
a
noise
burst.
Transis-
tor
load
switching
devices
are
expensive
if
reason-
a,.bly
rapid
load
current
changes
are
to
be
achieved.
5-27
A
mercury-wetted
relay,
as
connected
in
the
logd
switching
circuit
of
Figure
5-5
should
be
used
for
loading
and
unloading
the
supply.
Vlhen
L"1is
load
switch
is
connected
to
a
60Hz
ac
input,
the
mercury-wetted
relay
will
open
and
close
60
times
per
second.
Adjustment
of
the
25K
control
permits
adjustment
of
the
duty
cycle
of
the
load
current
switching
and
reduction
in
jitter
of
the
os-
cilloscope
display.
5-28
To
check
the
load
transient
recovery
time<)
proceed
as
follows:
c.
Connect
test
setup
shown
in
Figure
5-5.
b.
Turn
VOLTAGE
control
fully
clockwise.
c.
Set
meter
switch
to
AMPS
and
range
switch
to
highest
current
range.
d.
Adjust
CURRENT
control
until
front
panel
meter
indicates
exactly
the
maximum
rated
output
current.
e.
Close
line
switch
on
repetitive
load
switch
setup.
5-6
f.
Adjus:
2SK
potentiometer
until
a
stable
display
is
obtained
on
oscilloscope.
VJaveform
should
be
within
the
tolerances
shown
in
Figure
5-6.
Output
should
return
to
within
::!::lOmV
(Model
6177B)
or
::!::25mV
(Model
61813)
of
nominal
value
in
less
than
200
mIcroseconds.
POWER
SUoPL
'(
UNDER
TES-:-
115VAC
60Hz
+
o 0 I
aSCILLOSCOP::
hp
140A
9\L9
~
- + G
RSI
v===~1
I~
i
RES!SIANCE
i MODEL
NO.
r--::-,-,W:::HC;M",S':-'_-I
H
i
"SI
FlLl
I
61778
2
98
! - - -
-o--,±..i
l
i==6=1=81=B=====I=O==~=3=9=O=
I I J
NOTES:
! l IN:: I I
I
SWITCH
I
:.
THIS
DRAWING SHOWS A
I
iN3253
SUGGESTED METHOD
OF
I
BUilDING
A LOAD SWITCH.
HOW:::VER, OTH:::R METHODS
COULD
B::
USED; SUCH
AS
A TRANSISTOR SWITCHING
NETWORK. MAX IMUM
LOAD
RATINGS
OF
LOAD SWITCH
ARE;
5AMPS
50av,250w
{NOT
2500Wl.
US:::
M:::RCURY
RELAY,
CLARE: TYP:::
HGO
1002
OR
W.E.
TYPE
2768
Figure
5-5.
Load
Transient
Recovery
Time,
Ie
st
Setup
1
NOM
-';---.,-<---'-""""-
r+
l
%
--'--
INOM-+----~-rc+=:"""-
I_-
I
l_I"I<>
I I
r-200uSEc-l
UNLOADING TRANS
lENT.
L
1
%
LOADING
TRANSIENT
Figure
5-6.
Loae.
Transient
Recovery
Time,
Vlaveforms
•
•