Heathkit IB-5281 - Page 38

Page 36
9. Read the resistance, indicated by the dial
est _ ona re.
pointer, on the “B”’ scale. If the dial pointer
indicates “‘1’’ (center scale), the resistors are
of equal value. If the pointer is to the right or
left of center scale, the resistors are not of
equal value. To determine the value of the
unequal resistor (or any component being
tested), use the formulas shown inside the
““B” scale. If the pointer is tothe left of center
scale, use the formulas inside the left scale.
This
part
of
the
Manual
provides
you
with
informa-
tion
that
will
help
you
locate
and
correct
difficulties
which
may
occur
in
your
RLC
Bridge.
This
informa-
tion
is
divided
into
two
sections.
The
first
section,
“General,”
contains
suggestions
of
a
lnaturein
@ Visual check and inspection.
e@ Precautions to observe when bench testing.
The
second
section
contains
a
“Troubleshooting
Chart”
that
hasa
series
of
“Conditions”
and
“Possible
Causes.”
Start
your
troubleshooting
procedure
by
first
reading
the
following
“General”
section.
Then
proceed
to
the
appropriate
“Condition”
and
“Possi-
ble
Cause.”’
GENERAL
Visual Checks
1. About 90% of thekits that are returned for repair
do not function properly due to poor soldering.
Therefore, you can eliminate many troubles by a
careful inspection of connections to make sure
they are soldered as described in the “‘Solder-
ing” section of the “Assembly Notes.” Re-heat
any doubtful connections and be sure all the
wires are soldered at places where several wires
are connected. Check carefully for solder
Ge guearHxKire
If the pointer is to the right of center scale,
use the formulas inside the right scale. It is
normal when you measure extreme values,
to have the null occur at a mich higher
point on the null meter.
NOTE: If you use batteries with your RLC Bridge,
measure them with a voltmeter occasionally to make
sure they are 7 volts or higher. This will insure the
best operation for your bri
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proper locations, and installed correctly.
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3. Check the value of each part. Be sure that the
1 da ints the rirenit
proper part has been wired into the circuit
shown in the Pictorial diagrams and is called
out in the wiring instructions. It would be easv
eet shit AsED 448084 wv ARRAN Rt EOYs
for example,to install a 200 © (red-black-brown)
resistor in a step that calls for a 1000 2 (brown-
black-red) resistor. _
4. Recheck the wiring. Trace each lead in colored
pencil on the Pictorial as you check it. It is fre-
quently helpful to have a friend check your
work. Someone who is not familiar with the unit
may notice something you have consistently
overlooked.
on
Q
os
0 ie) =
i?)
2, = o
8
circuit board or switches to be sure the wires do
not touch each other or other lugs. Make sure all
wires are properly soldered.
ll is not cured, read the “Pre-
Bench Te esting,” then refer to the
“J