Fluke 5205A Instruction Manual page 57

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Figure 4-9.
CALIBRATOR
MODE
INTERCONNECTIONS
4-131. Logic Trip
Adjustment
NOTE
This setting monitors
the logic supply voltage
and
is
adjusted
at
the factory.
It
should not
require
normal
calibration,
however, adjustment
could be required
if drift
within the
circuit
is
sufficient to trip
the instrument
into
FAULT.
4-1 30
If
required, adjust the
logic trip circuit using the
following procedure;
a.
Verify that
there are
no jumper
pcbs
or
jumpers
installed in the
5205
A
and both power
cords
are
connected
to the
line source.
b.
Connect
the
DVM
Hi
input
to
TP
409
(+5)
and
the
LO
input
to
TP 407
(GND).
Prepare the
DVM
to read
+5
volts dc.
Both
test points are located
on
the
logic pcb.
c.
Connect
a
jumper between TP 418
and
TP
417.
(Located
near the
FAULT
and
OVERLOAD
in-
dicators
on
the Logic pcb.)
d.
Set the
POWER
switch
to
ON
and
wait
30
seconds
for
the
warm-up
period to expire.
e.
The
DVM
should read
between
4.75 and 5.25V
dc.
f.
Rotate
R47
fully
clockwise and
then very slowly
adjust
until the
fault
indicator extinguishes.
g.
Check
at
high
&
low
line
voltage
limits
(nominal
±10%)
that the Logic
circuits
+5
Volts
is
between
+4.75 and +5.25
Volts dc and the
instrument does
not
trip into
FAULT.
h.
Set the
POWER
switch
to
OFF
and
disconnect
the
test
equipment and jumper.
4-133.
TROUBLESHOOTING
4-134.
Troubleshooting
for the
5205A
consists of the tab-
ular
flow
chart
in
Table
4-3.
When
a step
on
the
flow
chart
is
completed
check
for a decision transfer.
If
no
decision
is
required perform
the next
step
of
the table in
sequence.
WARNING!
Lethal
vollages
up
to
2.5K
Volts are present
within
the instrument during troubleshooting. In addition,
the voltage
may
be
present
for
up
to
30 seconds
after
power
is
removed from
the instrument.
Before
coming
into physical contact with
any component
use a voltmeter and
5kV
probe
to insure
there
is
no
voltage present between tp502 (+2.5kV) and
tpS03(LO), between tpS04 (— 2.5kV) and tp506
LO), and between tp505 (-2.5kV) and tp506 (LO).
All test points are
on
the
Power Supply
pcb.
Extreme
caution should be
exercised
at
all
times
when
working with
this
instrument.
4/76
4-23