AT2811 User
’
s Guide
16
4.
Specification
This chapter provides the following information:
Technical
Specifications
General
Specifications
Dimension
4.1
Technical Specifications
The following data are measured under the following conditions：
Temperature：23℃
±
5℃
Humidity:
65% R.H.
Zero Correction: OPEN and SHORT Zeroing before testing
Warm up：60 minutes and more
Calibration Time：12 months
Test frequency accuracy:： 0.02%
Basic accuracy：0.25%
C
：
0.25% (1+ Cx/Cmax+ Cmin/Cx )(1+Dx )( 2+kf )
；
L
：
0.25% (1+ Lx/Lmax+ Lmin/Lx )(1+1/Qx )( 2+kf )
；
Z
：
0.25% (1+ Zx/Zmax+ Zmin/Zx )(2+kf )
；
R
：
0.25%(1+ Rx/Rmax+ Rmin/Rx )(1+Qx)(2+kf )
；
D
：
0.0025(1+ Zx/Zmax+ Zmin/Zx )(1+Dx+Dx
2
)(2+ kf )
；
Q
：
0.0030(1+ Zx/Zmax+ Zmin/Zx )(Qx+1/Qx )(2+ kf )
；
Where
：
1
．
L
，
C
，
R
，
Z is relative error; D
，
Q is absolute error.
2
．
Subscript that is X is this parameter’s measured value, Subscript that is max is maximum value,
min is minimum value.
3
．
kf frequency factor
Measured parameter maximum value and minimum value that affect accuracy
100Hz
120Hz
1kHz
10kHz
Cmax
800
F
667
F
80
F
8
F
Cmin
1500pF
1250pF
150pF
15pF
Lmax
1590H
1325H
159H
15.9H
Lmin
3.2mH
2.6mH
0.32mH
0.032mH
Zmax/ Rmax
1M
Zmin/ Rmin
1.59
Test frequency error factor kf
When f = 100Hz
、
120Hz
、
1kHz
kf=0
；
when f = 10kHz
kf=0.5
