174
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7.5 Test Accuracy
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Zmin = 1.0144 k
Ω
×
(1 - 0.08/100
）
1.0136k
Ω
Zmax = 1.0144 k
Ω
×
(1 + 0.08/100
）
1.0152k
Ω
θ
min = 78.69 - 0.05 = 78.64
°
(
θ: |θ|
absolute value)
θ
max = 78.69 + 0.05 = 78.74
°
Csmin = 1/(Zmax
x
ω
x
sin
θ
max)
159.85 nF ........ -0.09%
Csmax = 1/(Zmin
x
ω
x
sin
θ
min)
160.15 nF ....... +0.09%
ω
= 2
x
π
x
f
f: frequency [Hz]
Test speed
FAST
NORMAL
SLOW
SLOW2
C
5
2
1.5
1
Cable length
0 m
1 m
D
1
(100 kHz max) 1.5 + 0.015 f [kHz]
(100.1 kHz min) 1.5 + 0.3 f [MHz]
f: measurement frequency
Temperature
Operating temperature = T
E
0.1
basic accuracy
|T-23|
From the basic accuracy, find ranges that each of Z and
θ
can take.
From the ranges of Z and
θ,
determine ranges of Cs can take.
Hence the accuracy of Cs is
0.009
2. Test speed coefficient (C)
3. Test cable length coefficient (D)
(When using a 1.5C-V coaxial cable)
4. Temperature coefficient (E)
Note The above mesurment specification was determined using a 1.5C-
2V coaxial cable with an established cable length for the unit.
Using a cable other than a 1.5C-2V, or a cable that not an
established length for the unit in question increases the chance of
measurement inaccuracy. A large capacitance between the H
terminal and grounding capacitance (GND) or the L terminal and
GND may result in mesurement inaccuracy. Please set the GND to
10pF or less.
