Protek Z9216 - Range and Calibration Accuracy

For D > 0.1, the impedance accuracy must first be calculated. To do this, first calculate the
impedance of the DUT by adding the resistive and capacitive elements, either in series or parallel, as
appropriate. Use the impedance accuracy graph to obtain an impedance accuracy, and let it be
denoted A
z
. The accuracies of C and R are calculated from the impedance accuracy as follows:
Accuracy of C in % = ± [A
z
× (1 + |D|)] (6)
Accuracy of R in % = ± [A
z
× (1 + 1/|D|)] (7)
Accuracy When Holding a Nonoptimal Range
When a component is measured outside of its nominal range (in range hold), the accuracy of the
measurement is reduced. The nominal ranges are defined as approximately four times above and
below the nominal impedance value:
Range Nominal Impedance Range
R3 6.25 Ω to 100 Ω
R2 100 Ω to 1.6 kΩ
R1 1.6 kΩ to 25.6 kΩ
R0 (100 Hz to 10 kHz) 25.6 kΩ to 400 kΩ
(R0 is not defined for 100 kHz.) Components that are measured while auto ranging have only one set
of extreme range terms (K
h
, K
l
) per frequency.
For components measured in the range hold mode, the values of K
h
and K
l
are different for each
range. These values are calculated from parameters tabulated below in Tables 2-7 to 2-9 for
resistive, inductive, and capacitive measurements, respectively.
Table 2-7 - Parameters for Calculating K
l
and K
h
for Resistive Measurements
R
l
= K
l
× Z
m
R
h
= K
h
× Z
m
Frequency R3 R2 R1 R0 R3 R2 R1 R0
100, 120, 1 kHz
1 mΩ 0.02 Ω 0.2 Ω 4 Ω 400 kΩ 6.5 MΩ 100 MΩ 2 GΩ
10 kHz
1 mΩ 0.02 Ω 0.2 Ω 4 Ω 400 kΩ 6.5 MΩ 100 MΩ 1.5 GΩ
100 kHz
4 mΩ 0.03 Ω 0.4 Ω
---
200 kΩ 3 MΩ 50 MΩ
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1
2