BK Precision 894 User Manual

86
Figure 30 depicts the basic accuracy using low or medium measurement speed. Whenever a
values falls on a range line use the larger accuracy value. Measurements tend to be less
accurate when high speed measurements are performed. When selecting fast measurements
speed, multiply by 2 the accuracy shown above.
Measurement Accuracy Ae
The Measurement Accuracy Ae includes the following: test voltage level, impedance of the DUT,
frequency used (directly calibrated or indirectly calibrated), cable length, temperature factor
and scan fixture modification error, in addition to the accuracy of the unit.
The accuracy Ae of Z, Y, L, C, R, X, G and B is expressed as:
A
e =
± [A
L
× A+（K
a
+K
b
+K
c
）×100+ K
d
+K
f
]×K
e
[%]
A： Measurement Accuracy (From Figure 30 )
A
L
: Level correction factor (Table 12)
K
a
：Impedance rate factor (Table 13)
K
b
：Impedance rate factor (Table 13)
K
c
：Calibrated interpolating factor (Table 16)
K
d
：Cable length factor (see Cable Length Factor: Kd)
K
e
：Temperature factor (Table 18)
K
f
：Scan fixture modification factor (no adding：K
f
= 0, adding：K
f
= 0.2)
Parameter
Condition
Measurement Accuracy Ae
L, C, X, B
D
x
≤ 0.1
Ae=Ae
R, G
Q
x
≤ 0.1
Ae=Ae
L, C, X, B
D
x
≥ 0.1
Ae=Ae(   


)
R, G
Q
x
≥ 0.1
Ae=Ae(   


)
Accuracy of G is only available in G-B combination.
Measurement Correction Factors
The basic accuracy A applies when the voltage test level range is between 500 mVrms to 1.0
Vrms. When the voltage test level is outside this range, select the value of A
L
according to Table
12 - Level Correction Factor (A
L
).
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BK Precision 894 Specifications

General

Brand	BK Precision
Model	894
Category	Measuring Instruments
Language	English