NF ZM2371 - Page 239

9.1 Specifications
9-4 ZM2371/ZM2372
 Measurement accuracy
 Basic accuracy 0.08%
 Impedance measurement accuracy
Zr: Measurement range (100m to 1M)
Zx: Measured value of impedance magnitude|Z|
With the above definision, the impedance measurement accuracy is
obtained as follows:
Accuracy of impedance magnitude|Z| Az [%]
Az = ( A + B×U + Kz + Ky) × V × K
T
+ K
B
× U
Accuracy of phase angle  of impedance Pz []
Pz = 0.573 × Az
The measurement accuracy when Az exceeds 10 [%] is a
supplementary value.
Unless otherwise noted, the measurement accuracy of the measured
value smaller than half the lower limit of each recommended
measurement range or larger than twice the upper limit is a
supplementary value.
Each parameter value in the expression is listed below.
 U: Ratio coefficient
Zx
U
> 100
Zx / Zr (however, 1 when Zx / Zr < 1)
≦ 100
Zr / Zx (however, 1 when Zr / Zx < 1)
 V: Signal level coefficient
Measurement signal
level [Vrms]
V
Zr = 1M,
100k
(> 20kHz)
Zr = 100k
(≦20kHz),
10k, 1k,
100）
Zr = 10, 1
Zr = 100m
2 < Level≦5
1.3 1.3 1.3
1.3 1.3 1.3
1.3 1.3 1.3
3 2 1.3
1 < Level≦2
1.2 1.2 1.2
1.2 1.2 1.2
1.2 1.2 1.2
1.8 1.5 1.2
1
1 1 1
1 1 1
1 1 1
1 1 1
0.5 < Level < 1
1.4 1.2 1.2
1.4 1.2 1.2
1.5 1.5 1.2
2.5 2 1.2
0.2 < Level≦0.5
1.4 1.3 1.3
1.4 1.3 1.3
2.5 2.2 1.3
3 3 1.3
× ( 0.5Vrms /
Meas. signal
level [Vrms] )
0.1 < Level≦0.2
2.2 2.2 1.4
1.4 1.4 1.4
3.5 3.5 1.4
× ( 0.2Vrms /
Meas. signal
level [Vrms] )
0.05 < Level≦0.1
2.5 2.5 1.6
× ( 0.1Vrms /
Meas. signal
level [Vrms] )
1.8 1.6 1.6
0.02 < Level≦0.05
4 2.8 2
0.01≦Level≦0.02
8 5 3
Three coefficients in each column are applied to the measurement speeds RAP, FAST,
MED from the left in order.
The coefficient for measurement speeds SLOW and VSLO is same as MED.
For FAST, the coefficient of MED is applied when measurement frequency≦40Hz.
For RAP, the coefficient of FAST when measurement frequency≦250Hz, or that of
MED when measurement frequency≦40Hz is applied.
The coefficient varies depending on the frequency when measurement range Zr =
100k. At all times, V = 1 for the direct-current resistance Rdc.