10
Cable length factor
Add the following cable length factor A
c
to the
measurement accuracy when the cable length is set
to 1 m (for 16048A) or 2 m (for 16048D) in CABLE
field, after performing the cable correction and the
OPEN/SHORT correction. When the cable length is
0 m, A
c
is 0 percent.
A
c
=
f
m
+ A
co
[%]
15
A
co
is the additional error when the impedance
range is above 5 kΩ.
A
co
=
|Z
m
|
.
f
m
.
K
t
[%]
1000
where:
f
m
= Test frequency in [MHz]
Z
m
= Absolute value of measured impedance in [kΩ]
K
l
= Test cable length in [m]
Temperature factor
Multiply the sum of the basic accuracy and the
cable length factor by the following temperature
induced error K
t
, when the temperature range is
0 °C to 55 °C. The boundary belongs to the smaller
multiplier.
Figure 1-5. Temperature factor K
t
Measurement Accuracy Calculation Example
Example of L
s
-Q accuracy calculation
Measurement conditions
Measured inductance L
x
of DUT: 220 nH
Measured Q value of DUT: 30
Test signal level: 1 V
rms
Test frequency f
m
: 25.2 MHz
Integration time: LONG
Cable length: 0 m
Operating temperature: 28 °C
Determine inductance measurement accuracy A
e
1. From |Z|, |Y|, L, C, R, X, G, and B Accuracy
(see page 6), measurement accuracy A
e
is deter-
mined as below:
A
e
= ±(A
n
+ A
c
) K
t
2. First of all, to determine the measurement
accuracy A
e
, calculate the impedance value from
the DUT’s inductance value. So the measurement
impedance Z
m
is:
Z
m
= 2 πf
m
L
x
≈ 35 [Ω]
where:
f
m
= Test frequency [Hz]
L
x
= Measured inductance value of the DUT [H]
3. Choose an accuracy chart from Figure 1-3 and
Figure 1-4. The oscillator level is 1 V
rms
, then
Figure 1-3 is chosen for this measurement.
4. Find the frequency point of f
m
(25.2 MHz) along
the X axis in Figure 1-3. Both axes are in log for-
mat. Interpolation may be required.
5. Find the impedance point of Z
m
(35 Ω) along the
Y axis in Figure 1-3 determined in step 2. Both
axes are in log format. Interpolation may be
required.
6. Mark the intersection of above two steps and
determine the basic accuracy equation A
n
, integra-
tion factor K
i
, and oscillator level factor K
osc
.
From:
Test frequency f
m
: 25.2 MHz
DUT’s impedance Z
m
: 35 Ω
Integration time: LONG
Test signal level: 1 V
rms
Then, A
n
= A
1
, K
i
= 1, and K
osc
= 1 (rounded from
0.02).
(46 Seiten)
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