CAL LABS (CH)
Dielectric Probe
DIELECTRIC PROBE CALIBRATION (e.g., DAK PROBES)
| Measured Quantity |
Range |
Condition of measurement | Best Measurement Capability CMC for 7 mm probe (k = 2)* |
Remarks |
| Permittivity (relative) |
1 – 15 |
4 MHz ... 67 GHz |
2.0% ... 24.3% |
Low tangent < 0.1 |
|
10 – 40 |
4 MHz ... 67 GHz |
1.8% ... 6.4% |
Conductivity < 0.1 ... >10 S/m | |
|
35 - 100 |
4 MHz ... 20 MHz |
1.7% ... 6.7% |
Conductivity 0.1 ... >10 S/m | |
| Conductivity |
0.1 – >10 S/m |
4 MHz ... 67 GHz |
2.5% ... 4.7% |
Permittivity 1 ...100 |
| Loss Tangent | 0 – 0.1 |
4 MHz ... 67 GHz |
0.03 ... 0.46 |
Permittivity 1-15 |
| * Short summary of measurement capability of the dielectric probe dependent on TSL parameters. More details are specified in the Scope of Calibration. Open coaxial probes (OCP) with a diameter smaller than 7 mm have inherently larger uncertainty. |
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| Calibration Procedure | SPEAG has been accredited by the Swiss Accreditation Service METAS according to ISO 17025 to conduct traceable calibration of OCP from 4 MHz to 67 GHz (range dependent on DAK probe type). Dielectric measurements with known uncertainty are important for many applications, e.g., for SAR measurements and therefore calibration is required. The dielectric materials used during the evaluation have been carefully selected to cover the range of interest and have known parameters verified with traceable measurements. At low frequencies for low loss materials, the Loss Tangent is evaluated instead of the Conductivity which has a high uncertainty. Modular calibration packages allow to obtain the optimum calibration as required for a specific laboratory. Each calibration for the probe and optional accessories (cable, short circuit) includes: - Inspection of probe and accessories (if provided) - Conduction of the specific probe calibration sequence - Evaluation of the short calibration capability and performance - Evaluation of validation liquid measurement according to the package - Evaluation of material measurements according to package - Calibration document with the detailed results (material and frequency specific uncertainties) The following packages are available: * liquids package SAR/MRI (4 MHz – 10 GHz); head tissue simulating liquids (TSL), MRI saline solution * Semi-solid/Solid add-on package (300 MHz – 3 GHz); tissue simulating gel and low-loss planar material |
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| Contact |
For questions and quotations, please contact info@speag.swiss | |||
| Sample Certificate |
Open Coaxial Probe OCP-DAK3.5 | |||
