ESI 250-DA - Parallel Capacitance Measurement with External Q Rheostat

2.
4. 8.
2
PARALLEL.
CABAC^i/i^CE
BRIDGE
This
completes
the
parallel
capacitance
bridge.
TURN
THE D-Q
DIAL
COUNTER-
This
shorts
the internal D-Q
CLOCKWISE
UNTIL
IT
HITS
THE
rheostat.
MECHANICAL
STOP
AND
LEAVE
IT
THERE
DURING
THE
ENTIRE
MEASUREMEN’T.
BALANCE
THE
BRIDGE.
Use the
range
switch,
the MAIN
DIALS
and
the external
rheostat.
READ
Cp
(EQUIVALENT
PARALLEL
This
reading
does not
depend on
CAPACITANCE)
from
the
dials.
frequency.
CONNECT
AN
EXTERNAL
RHEOSTAT
”R"
BETWEEN
THE
HI
"C”
TERMINAL
AND
THE
EXT D-Q
TERMINAL
MARKED
G.
CALCULATE
D
D
=
1.592
D
-
Dissipation
factor in per
unit
fj^P
-
Frequency in
kilocycles
Rj^
-
External D-Q
reheostat
resistance in
kilohms.
C
P
C
s
[elsl
i
I
250-DA
10
/59
(1 + D^)