OMICRON Lab
11
Application Information
4.6
Measurement Range and Accuracy
Measurement accuracy and measurable impedance range are limited by the following factors:
•
Open / Short / Load calibration respectively correction:
The measurement is relative to the calibration elements. Hence, accuracy depends on the
accuracy of the calibration elements.
•
Noise:
Especially when reducing the signal level or increasing receiver bandwidth values, noise can be
the limiting factor. To reduce noise, use a higher signal level and lower receiver bandwidth
setting.
•
Contact resistance:
Both, the
B
‑
WIC and B
‑
SMC
are subject to contact resistance. The gold plating of the
electrodes lowers the contact resistance to
around 0.5 mΩ. Make sure to have clean contacts
before performing Short calibration and low value impedance measurements!
The following figure shows the measurement range and the typical relative accuracy that can be
expected when measuring impedance with
B
‑
WIC and B
‑
SMC
:
Figure 4-6: Typical relative accuracy achievable with
B
‑
WIC and B
‑
SMC
Note
: The relative accuracy results were determined using an Agilent E4980A precision LCR meter as
reference. The measurements were done using 10 Hz receiver bandwidth setting to reduce noise.
Note
: Accuracy rating can change without notice.
