Product Info
Report No: CCISE191202301-V01
Shenzhen Zhongjian Nanfang Testing Co., Ltd. Project No.: CCISE1912023
No. B-C, 1/F., Building 2, Laodong No.2 Industrial Park, Xixiang Road,
Bao’an District, Shenzhen, Guangdong, China
Telephone: +86 (0) 755 23118282 Fax: +86 (0) 755 23116366, E-mail: info@ccis-cb.com Page 16 of 171
8.8 Data storage and Evaluation
Data Storage
The DASY software stores the assessed data from the data acquisition electronics as raw data (in
microvolt readings from the probe sensors), together with all the necessary software parameters for the
data evaluation (probe calibration data, liquid parameters and device frequency and modulation data) in
measurement files. The post-processing software evaluates the desired unit and format for output each
time the data is visualized or exported. This allows verifications of the complete software setup even after
the measurement and allows correction of erroneous parameter settings. For example, if a measurement
has been performed with an incorrect crest factor parameter in the device setup, the parameter can be
corrected afterwards and the data can be reevaluated.
The measured data can be visualized or exported in different units or formats, depending on the selected
probe type (e.g., [V/m], [mW/g]). Some of these units are not available in certain situations or give
meaningless results, e.g., a SAR-output in a non-lose media, will always be zero. Raw data can also be
exported to perform the evaluation with other software packages.
Data Evaluation
The DASY post-processing software (SEMCAD) automatically executes the following procedures to
calculate the field units from the microvolt readings at the probe connector. The parameters used in the
evaluation are stored in the configuration modules of the software:
Probe Parameters:
- Sensitivity
Norm
i
, a
i0
, a
i1
, a
i2
- Conversion
ConvF
i
- Diode compression point
dcp
i
Device Parameters:
- Frequency
f
- Crest
cf
Media Parameters:
- Conductivity
σ
- Density
ρ
These parameters must be set correctly in the software. They can be found in the component documents
or they can be imported into the software from the configuration files issued for the DASY components. In
the direct measuring mode of the multi-meter option, the parameters of the actual system setup are used.
In the scan visualization and export modes, the parameters stored in the corresponding document files are
used.
The first step of the evaluation is a linearization of the filtered input signal to account for the compression
characteristics of the detector diode. The compensation depends on the input signal, the diode type and
the DC-transmission factor from the diode to the evaluation electronics. If the exciting field is pulsed, the
crest factor of the signal must be known to correctly compensate for peak power.