BK Precision 894 - Page 88

88
Medium
Slow
Fm  1.2 kHz
msm fVZ
100
)
200
1)(
101
(
3



ms
m
fV
Z
100
)
70
1)(103.0(
9


1.2 kHz  fm ≤ 8 kHz
)
200
1)(
101
(
3
sm VZ



)
70
1)(101(
9
s
m
V
Z 

8 kHz  fm ≤ 150 kHz
)
70
1)(103(
9
s
m
V
Z 

150 kHz  fm ≤ 1 MHz
)
70
1)(1010(
9
s
m
V
Z 

Fast
Fm  1.2 kHz
msm fVZ
100
)
400
1)(
105.2
(
3



ms
m
fV
Z
100
)
100
1)(106.0(
9


1.2 kHz  fm ≤ 8 kHz
)
400
1)(
105.2
(
3
sm VZ



)
100
1)(102(
9
s
m
V
Z 

8 kHz  fm ≤ 150 kHz
)
100
1)(106(
9
s
m
V
Z 

150 kHz  fm ≤ 1 MHz
)
400
2)(
105.2
(
3
sm VZ



)
100
1)(1020(
9
s
m
V
Z 

Table 13 - Impedance Rate Factors - Ka and Kb
Where, f
m
is the test frequency and the unit is [Hz].
Zm= Measured Impedance of DUT
The unit of the tested impedance is [Ω].
The unit of the test signal voltage is [mV
rms
].
When the impedance is smaller than 500 Ω, Ka applies and Kb is not specified.
When the impedance is bigger than 500 Ω, Kb applies and Ka is not specified.
If the cable length of the text fixture is extended, apply the following compensation to Ka and
Kb:
Ka Compensation
Determine the K
a
compensation and add it to the K
a
value obtained from the table above, the
result will be the new K
a
and it is this value what should be used in the accuracy calculation:
Cable length L [m]
0
1
2
Ka
0
0.0005
0.0010
Table 14 - Extended Cable Length – K
a
Compensation (Impendace Z
m
< 500 ohms)
)
200
3)(
101
(
3
sm VZ



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