EM TEST (Switzerland) GmbH CWS500 N1.3 / N1.4
User manual V 1.01 33 / 47
Calibration
Calibration files, generated with CWS500N1.x (*.cdx) are only applicable with standard test
who are based on the standard IEC 61000-4-6.
Tests based on other standards uses own calibration files (*.cal icd.control software)
General Information
A high frequency powermeter is included within the CWS500N1.x. This measuring device is used for calibration
purposes. The complete test setup, including insertion loss of coupling devices and cables, can be calibrated
with this powermeter.
The internal controller will compensate the frequency behavior of the test setup according to the requirements of
IEC 61000-4-6.
For each single CDN, a calibration file is generated and stored in the CWS500N1.x. During the test in process,
this file controls the output level of the RF-amplifier. Five Cal files may be stored and handled in the
CWS500N1.x . The EM clamp as well as the current injection clamp (BCI-Clamp) can be calibrated by using the
same method.
The advantage of this system can be explained as follows:
1. Different CDN’s can be calibrated and used together with the CWS500N1.x . The internal software of the
CWS500N1.x will compensate automatically for non-linear results during each calibration.
2. The operator can calibrate the complete test setup as necessary. The operation is easy and fast.
3. Changes in the test setup and in the cable layout will also be compensated with a new calibration.
4. The calibration function can be started by each internal program of the CWS 500N1.x. These Cal files are
valid for all test routines as long as the test setup is not changed. Cal files can be activated during each test
routine by pressing ”Change“.
5. If the operator needs more than five Cal files, he can use the icd.control software (delivered with the
CWS 500N1.x). icd.control can upload the calibration data to a computer to be saved on the hard drive. The
necessary files to conduct a test can also be downloaded to the CWS 500N1.x and stored in one of the five
memories (e.g. when a larger number of different CDN’s are used in the same test setup).
icd.control supports an almost unlimited number of CAL files. The CAL files can be displayed graphically.
It is recommended to calibrate the setup each time it was changed.
For calibration EM TEST propose to use the icd.control software. Do not use any other program. For a
calibration procedure use the CWS 500N1.x as measuring instrument. Please work only with the implemented
CAL routine (software or firmware). Icd.control software only handles these two functions.
For more information please consult your local EM TEST representatives.
150Ω to 50Ω adaptor
Reference plane of the 150Ω to 50Ω adaptor
New in IEC 61000-4-6 Ed. 4 is the size of the reference plane. The reference plane area depends on the
parameter h. (height of the CDN connector)
Dimension of the reference plane
Fig 7.5 : example of reference plane dimension
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