ESI 250-DA - Extending D and Q Ranges with External Rheostat; Parallel Inductance Measurement with External Q Rheostat

2.3.
8 TO USE
AN EXTERNAL
Q
RHEOSTAT
The
D and
Q
ranges of
the bridge can
be
extended
by use of an external
rheostat.
The
curve below shows the
ranges
of D
and
Q
for
which
tnis
technique
is advisable.
1000
100
lOKC
DISSIPATION FACTOR
(D)
1.0 0.1
0.01
Q.OOl
0.0001
0.01 KC
0.001 0,01
100
1000
10,000
STORAGE
FACTOR
(0)
ALWAYS SET
THE CIRCUIT
This
bridge
circuit
gives the best
SELECTOR TO
L PARALLEL,
results
for
both
the series and
parallel bridge
connections
when
using
an external
D-Q
rheostat.
ALWAYS TURN
THE D-Q DIAL
This
shorts
out
the internal
D-Q
CLOCKWISE UNTIL IT HITS THE rheostat.
MECHANICAL STOP
AND LEAVE IT
THERE DURING THE ENTIRE
MEASUREMENT,
2. 3.
8.1
PARALLEL
INDUCTANCE
BRIDGE
REPLACE THE
EXT
D-Q
JUMPER BY
AN
EXTERNAL
RHEOSTAT "R".
BALANCE
THE
BRIDGE,
mmi
250-DA
7/59
This completes
the parallel
inductance
circuit.
Use
the
range switch, the
MAIN
DIALS and the
external
rheostat.