NF ZM2371, Instruction Manual

Page: 242 / 255

9.1 Specifications
9-7 ZM2371/ZM2372

Other conditions
Warm-up 30 minutes or more
Zero correction Execute open correction and short correction.
Cable length correction Execute according to the cable length.
Measurement accuracy is not guaranteed in a range other than
the following applicable frequency range.
Cable
length
Applicable frequency range
0m, 1m All ranges including DC
2m DC, Frequency
≦
20kHz
4m DC, Frequency
≦
1kHz
Calibration cycle 1 year

Measurement accuracy of measurement parameters except Z and

From the measurement accuracy of impedance, obtain as follows.
Here, Qx is a measured value of Q, Dx is a measured value of D, and

x
is a measured
value of

.

x used for accuracy calculation may be obtained from (90

- tan
-1
|1/Qx|) or
(90  - tan
-1
|Dx|).
Parameter Measurement accuracy
|Y| ±Az [%]
Lp, Ls, X ±Az [%] (|Qx|
≧
10), ±Az / sin 
x
[%] (|Qx|< 10)
Cp, Cs, B ±Az [%] (|Dx|
≦
0.1), ±Az / sin 
x
[%] (|Dx|> 0.1)
Rp, Rs, G ±Az [%] (|Qx|
≦
0.1), ±Az / cos

x
[%] (|Qx|> 0.1)
Rdc ±Az [%]
Q ±Qx 2 × Pe / ( 1 - |Qx| × Pe ) (|Qx|
≧
10, |Qx| × Pe
≦
0.1)
Here, the phase angle error Pe [rad] = 0.01

Az [%].
It differs from Pz [

].
Measurement accuracy of Q is absolute value. It is not a % value.
D ±(0.01 × Az) (|Dx|
≦
0.1)
Measurement accuracy of D is absolute value. It is not a % value.
In general, a range of each measurement parameter (maximum value and minimum
value) can be calculated based on an error circle of the impedance.

= 2
  
Measurement frequency [Hz], Suffix “x” of the parameter indicates a measured value.
Figure 9
–1 Range of error
|Zx|
Rsx

Lsx = Xx
= -1/(

Csx )

x
Az [%]
±
Az / cos(

x ) [%]
±
Az / sin(

x ) [%]
Qx = tan(

x )

x
：
0
～
180
°
Phase accuracy
|Yx|
Gx = 1 / Rpx

Cpx = Bx
= -1/(

Lpx )

x
Az [%]
±
Az / cos(

x ) [%]
±
Az / sin(

x ) [%]

c
Dx = tan(

c)

c
：
±
90
°
Phase accuracy