HP 6177B Operating And Service Manual
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Table
5-4.
Isolation:
Guard
and
.\1ain
Feedback
Loop
(Continued)
---
OBSERVATIONS ANI)
CONCLUSIONS
---
1.
I:
the
meter
varies
from
zero
to
within
shaded
cree
on
meter
face,
this
indicates
that
the
guard
supply
is
operable
ane
the
source
of
trouble
lic!O
elsewhere.
Ii
original
trouble
symptom
was
out-
put
current
higher
than
the
programmed
value
according
to
front
panel
meter,
reconnect
guard
and
proceed
to
Table
5-6.
I:
original
symptom
was
m.:t;:lUt
current
lower
than
the
programmed
value,
reCOfmect
guard
and
proceed
to
Table
5-S.
2.
If
meter
does
not
vary
proportionally
to
the
CUR?EKT
control
setting,
the
source
of
trouble
lies
within
the
:;.mare
circuit.
Proceee
to
Table
5-9.
Table
5-5.
Isolation:
Main
FeedbccK
Loop
and
Voltage
Limit
Circuit
---
PURPOSE
To
isolate
the
voltage
limit
circuit.
PROCEDURE
---
1.
Disconnect
diode
CR13
and
resistor
R19.
2.
Disconnect
Zener
diode
VR4.
3.
Connect
load
resistor
shown
in
Figure
5-3.
4.
Connect
voltmeter
across
load.
S. Vary
front
panel
CURRENT
control,
observlna
both
external
voltmeter
and
UTIlt's
ammeter
readings.
Calculate
actual
output
current
and
compare
results
with
supply
meter
reading.
---
OBSERVATIONS
AND
CONCLUSICNS
---
1.
If
actual
output
current
(according
to
calculated
values)
varies
proportionally
to
programmed
output
(according
to
unit's
ammeter),
this
indicates
that
the
source
of
trouble
is
within
the
voltage
limit
circuit
or
overshoot
control
circuit.
Proceed
to
Table
5-7.
2.
If
actual
output
current
does
not
vary
proportionally
to
programmed
output.
this
indicates
voltage
limit
circuit
is
operable
and
trouble
lies
elsewhere.
Reconnect
components
and
proceed
to
Table
5-6.
Table
5-6.
Isolation:
Series
Regulator
and
Constant
Current
Comparator
NOTE
Because
of
the
high
current
flowing
through
and
around
the
series
regulator,
a
slip
0:
the
hand
while
testing
a
component
in
thiS
section
may
cause
unpredictable
reac-
tions
in
other
circuits.
The
following
procedure
describes
a
way
to
test
the
operation
of
the
regulator
and
driver
without
endangering
any
other
circuits,
~
---
PURPOSE
---
To
isolate
the
series
regulator
and
driver.
PROCEDURE
1.
Disconnect
ZI
by
pulling
it
out
of
its
socket.
2.
Connect
a
SOKr~
potentiometer
between
common
(A3)
and
Test
Point
18.
See
Figure
7-2
for
location
of
TPlS.
5-li