Setup Improvements; Error Correction - Omicron Lab SPECTANO 100 User Manual

SPECTANO 100 User Manual
8

Setup improvements

8.1

Error correction

To eliminate, for example, the stray capacitances and unknown capacitances between the leads of the
used test cell, we recommend performing reference measurements by using a reference material with
a known permittivity (e.g. air). The following error correction is based on the air reference example and
proceeds as follows:
1. Depending on your test cell type, insert either a spacer between the electrodes or adjust
the electrodes with a locking screw so that you can measure the air gap height.
Note: We recommend using a small spacer (lower than 5 mm) consisting of a material with low
permittivity and especially low losses, for example PTFE or PE. Moreover, the spacer surface must be
flat at all points.
Electrode
Spacer ring
Electrode with guard
Figure 8-1
Electrode
Electrode with
guard ring
Figure 8-2
20
Input
Output
Adjusting the air gap height by using a spacer
Input
Output
Adjusting the air gap height by using a locking screw
Height adjustment
with locking screw
Air gap
height
Air gap height