NF ZM2376 - Page 202

7.1 Specification
7-6 ZM2376
 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 definitions, the impedance measurement accuracy is
obtained as follows:
Accuracy of impedance magnitude |Z| ±Az[%]
Az = ( A + B×U + Kz + Ky) × K
T
+ ( Kv + K
B
)× U (Level ≤ 1V)
Az = ( A + B×U + Kz + Ky) × K
T
+ Kv + K
B
× U (Level > 1V)
Accuracy of phase angle  of impedance ±Pz[°]
Pz = 0.573 × Az
The measurement accuracy when Az exceeds 10[%] is a supplementary
value. Excluding the highest and the lowest ranges available for each
frequency, the measurement accuracy for the measured value smaller than
half the lower limit of each recommended measurement range or larger than
twice the upper limit is a typical value.
Each parameter value in the expression is listed below.
• U: Ratio coefficient
Zx
U
> 100Ω
Zx / Zr (however, 1 when Zx / Zr < 1)
≤ 100Ω
Zr / Zx (however, 1 when Zr / Zx < 1)
If the measureable range for the 10 range becomes unlimited depending on the minimum
output impedance setting, the following values should be used.
Zx
U
> 10Ω
Zx / Zr (however, 1 when Zx / Zr < 1)
≤ 10Ω
Zr / Zx (however, 1 when Zr / Zx < 1)