bedea – Rosenberger - Bedea Berkenhoff & Drebes GmbH

New developments and accessories for the CoMeT test set-up
bedea – Rosenberger
CoMeT- newsletter - 01/2003 - S. 2
There are different improvements, complements and accessories to the CoMeT test set-up
about which we want to inform you more detailed.
Due to the modular construction, the different components or complements may be assembled
without any restriction.
1 Stretching device
When measuring the screening attenuation in the tube, the cable under test shall be centred in
the middle of the tube to avoid changes of the characteristic impedance in the second system.
This may be achieved by maintain the measurement with vertical mounted tube but with
incumber handling
With the stretching device, one can keep the sample centred in the horizontal mounted tube.
Care should be taken not to apply to high stretching forces to the screen of the sample because
this will change its characteristics.
The stretching device is equipped with a torque wrench which allows to control the stretching
force.
Figure 2 – Stretching device for the CoMeT test set-up
Supply schedule: Stretching device, 1 set of contact slices, 2,2 to 9,8 mm, torque wrench
An investigation of the influence of stretching forces to the test results of screening
measurements may be ordered from bedea.
2 Extension set for 10mm to 15mm diameter
Measuring the screening attenuation and the transfer impedance up to 15mm diameter over
screen with the CoMeT 40/2 (standard application up to 9,8mm over screen).
The additional reflection due to the enlarged case shall be taken into account when evaluating
the test results.
An investigation of the influence of additional reflections to the test results of screening
measurements may be ordered from bedea.
Supply schedule: Enlarged contact case, contact slices from 9,8mm to 14,8 mm.
bedea Berkenhoff&Drebes GmbH, Postfach 1140, D-35607 Asslar, Germany, bmund@bedea.com