Table of Contents
Advertisement
~
__ TY_P_E_l_60_8_-A-,--' M _P_E..:....O_A_N_C_E_B_R_'_O_G_E
_
The residual resistance of the bridge is approxi-
mately 0.9.0.
This can cause a small Q error when Lx
is small.
If long leads are used, the Q error becomes
more important (see Table 2-5).
The residual bridge
capacitance of 0.25 pf can cause an L error when Lx is
very large.
However, this capacitance is usually neg-
ligible compared with the capacitance of a large induc-
tor. Long leads to the inductor may appreciably change
the total capacitance.
The corrections for these lead
effects are given in Table 2-5.
When inductors with low Q's are measured, an ad-
ditional error term of ±0.5%
~
2 is added to the specifi-
cations (ref er to paragraph
1.
5.
3).
This error is neglig-
ible when Q is greater than 5.
TABLE
2-5
CORRECTIONS FOR ERRORS CAUSED BY TERMINAL AND LEAD IMPEDANCES
(Add or subtract from the measured value as indicated.)
Measured
Series Resi stance
Series Inductance
Parallel Capacitance
R o = 0.9 mD t leads
L o =0.14 J.1.h tleads
Co = 0.25 pf t leads
C s
NO ERROR
-u.;2L o C x 2
-C o (1-D x 2)
D
-u.;CxRc
-w 2 L o C x D x
+ D Co (1 + D2)
ex
C
p
+2R o D x u.;C x 2
-w 2 L o
Cx
2 (1 - D
x 2)
-Co
D
-u.;C x R o (1 + D/)
-w 2 L o C x D x (1 + D x 2)
+ Co D
x
C x
G
p
+G x 2R o (1 + Qx 2 )
+u.;2L 2G 3(1 -
~)
NO ERROR
o
x
u.;GxL o
Q
+QxGxRo(1 - Qx 2 )
+wLoG x (1 + Qx 2 )
- u.;C o
G x
2Qx
R s
-R o
NO ERROR
+u.;2C
2R 3(1-
-~)
o
x
u.; CoR x
R o
u.;L
Q
QXR
_ _ _ 0
+u.; Co R x (1 + Qx 2 )
x
R x
1
L s
NO ERROR
-L o
-w
2 C
L 2(1 - - )
o x
Q
x
2
Q
2 Ro
_ L o Q
1
+Q
- -
+u.;2C
L (Q +-)
x u;L
L
x
o x
x
Q
x
x
x
2R o
1
L
p
+--
-L ( 1 - - )
-u.;2C o L x 2
Qw
o
Q
x
2
Q
R o
L o
1
+u;2C o
LxQx
I
+ -
(1 +Q2)
-
CQ x + Q}
wL x
Lx
14
Advertisement
Table of Contents
