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Heathkit IB-5281 - Operation; Using the Bridge

Heathkit IB-5281
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Page
35
(Geguesruxir:
OPERATION
This
RLC
Bridge
is
a
conventional
bridge
circuit
powered
by
a
1
kHz,
10
kHz,
or
100
kHz
oscillator.
It
has
a
resistance
rar
nee
of
10
ohms
to
10
megohms,
an
inductance
range
of
10
wH
to
10
H,
and
a
capacitance
range
of
10
pF
to
10
uF.
An
external
standard
range
increases
the
versatility
of
this
Bridge
for
the
experi-
menter.
Refer
to
Pictorial
6-1
(Illustration
Booklet,
Page
7)
for
a
brief
description
of
the
controls,
meter,
and
termi-
nals.
NOTE:
It
is
always
best
to
connect
the
component
under
test
directly
to
the
Z,
terminals.
Long
leads
may
pick
up
stray
AC
fields
and
give
inaccurate
read-
ings.
If
you
use
test
leads,
keep
them
as
short
as
possible.
USING
THE
BRIDGE
NOTE:
The
following
procedure
uses
a
resistance
measurement
as
an
exampie.
Inductance
or
capaci-
tance
measurements
are
made
with
the
same
proce-
dure.
Make
sure
you
change
the
RANGE
switch
to
the
appropriate
setting
when
you
measure
different
types
of
components.
Refer
to
Pictorial
O-L1
(lhustration
Booklet,
Page
7)
for
a
description
of
the
controls.
To
test
an
unknown
resistance,
perform
the
following
stens
teps.
iy
3
3
s
+
>
fae)
a
iz
<
iczl
_
ip)
©
s
oo
|
oe
terclockwise.
2.
Turn
the
RANGE
switch
knob
to
the
proper
“R”
multiplier.
If
you
do
not
know
the
resis-
tance
value,
switch
to
the
RX
1
position
as
a
start.
3.
Place
the
POWER
switch
to
ON.
4.
Connect
the
unknown
resistance
to
the
Z,
terminals.
5.
Advance
the
LEVEL
control
for
an
approxi-
mate
full-scale
meter
reading
(10).
6.
Adjust
the
BALANCE
control
for
a
null
(minimum
deflection)
on
the
meter.
If
you
do
not
obtain
a
null,
switch
to
the
next
high-
mot
61?
bee
de
Cot
NW
TLUILLpLeL.
7.
Turn
the
LEV
EL
control
clockwise
for
an
approximate
full-scale
reading
and
care-
fully
readiust
the
BALANCE
control
for
any
further
null
on
the
meter.
8.
Read
the
resistance,
indicated
by
the
dial
pointer,
onthe
“A”
scale
Multiply
t
the
read-
OListes,
Olli
at,
Veli
ps
20a
ing
by
the
RANGE
switch
setting.
USING
AN
EXTERNAL
STANDARD
The
following
description
gives
only
one
typical
example
for
the
external
standard
function.
You
may
want
to
use
the
external
standard
for
other
applica-
tions.
When
you
use
the
external
standard
function,
make
sure
you
keep
the
two
component
values
within
a
10:1
ratio;
otherwise,
you
will
not
obtain
a
null.
A
null
is
the
lowest
reading
obtained
on
the
meter.
You
will
not
always
obtain
a
“0”
reading
when
you
null
your
meter.
EXAMPLE:
To
match
several
100
2
resistors
of
an
unknown
value
with
a
100
12
resistor
of
a
known
value
to
obtain
a
matched
pair,
perform
the
following:
1.
Turn
the
LEVEL
terclockwise.
r
conirol
fully
coun-
2.
Set
the
RANGE
switch
to
the
Z,
position.
3.
Connect
the
100
2
resistor
of
a
Known
value
to
the
Z,
(extern:
5.
Connect
a
100
O
resistor
of
an
unknown
value
to
the
Z,
terminals.
6.
Advance
the
LEVEN
control
clockwise
for
an
approximate
full-scale
meter
reading
7.
Adjust
the
BALANCE
control
and
obtain
a
null
on
the
meter.
8.
Turn
the
LEVEL
control
clockwise
for
a
full-scale
meter reading
and
carefully
re-
adjust
the
BALANCE
control‘for
a
null
on
the
meter.

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