ESI 250-DA - Page 17

Z.3.1
MEASURING
INDUCTORS
(cont.)
SET
THE
DETECTOR
SWITCH
TO
AC
OR
EXT
DET
This
connects
the
detector
to
the
bridge •
SET
THE
GENERATOR
SWITCH
TO
INTERNAL
AC
This
connects
the
generator
to
the
bridge
.
ADJUST
THE
MULTIPLIER
SWITCH
FOR
MINIMUM
DETECTOR
SIGNAL
This
sets
the
range
so
that
the
value
can
be
found
with
maximum
reso-
lution
on
the
main
dial
.
The
ANIP
and
OSC
controls
can
be
changed
to
give
optimum
sensitivity.
ADJUST
THE
MAIN
DIAL
AND
THE
D-Q
DIAL
ALTERNATELY
FOR
THE
WIDEST
AND
SHARPEST
POSSIBLE
SHADOW
ON
THE
NULL
INDICATOR
If
more
or
less
sensitivity
is
needed,
adjust
the
AMP
control
and/or
the
OSC
control.
Changing
the
OSC
control
may
change
the
inductance
of
iron
core
inductors.
IF
THE
MAIN
DIAL
READING
AT
balance
is
LESS
THAN
1.200,
USE
THE
NEXT
LOWER
SETTING
OF
THE
MULTIPLIER
SWITCH
AND
READJUST
THE
MAIN
DIAL
FOR
A
NULL
This
takes
advantage
of
the
increased
resolution
near
full
scale
of
the
dial.
THE
MEASURED
L
IS
THE
PRODUCT
OF
THE
READINGS
OF
THE
MULTI-
PLIER
SWITCH
AND
THE
MAIN
DIAL
AT
1
KC
THE
MEASURED Q
IS
THE
PRODUCT
OF
THE
READINGS
OF
THE
CIRCUIT
SELECTOR
SWITCH
AND
THE
D-Q
DIAL.
USE
BLACK
SCALE
FOR
L-S
FRIES
USE
RED
SCALE
FOR
L-PARALLEL
FOR
OTHER
FREQUENCIES:
MULTIPLY
Ogeries
in
kc;
or
DIVIDE
Q
arallel
frequency
in
before
DISCONNECTING
THE
INDUCTOR
SET
THE
GENERATOR
SWITCH
TO
EXT
GEN
This
disconnects
the
generator.
before
leaving
the
bridge
SET
THE
AMP
SWITCH
TO
OFF
This
turns
off
the
power
supply.
lelsTTl
250-DA
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