The disturbance emitted by electrical appliances, machines, and systems must
comply with the limits specified by national and international standards.
Absorbing clamps (MDS clamps) in conjunction with EMI measuring receivers are
used to measure the disturbance power on cables in accordance with CISPR 13 or
EN 55013, in accordance with CISPR 14-1 or EN 55014-1, as well as in accordance
with EN 50083-2. They can also be used in conjunction with twoport measuring
devices to measure the screening effectiveness of cables in accordance with DIN
47250 Part 6, IEC 96-1, and EN 50083-2. The MDS clamps are also used to test the
efficiency of disturbance suppression devices for high voltage ignition systems
in accordance with CISPR 12 or EN 55012.
In the frequency range below 30 MHz, the interference stipulated in many
standards is defined by measuring the disturbance voltage produced by the EUT at
the terminals of a line-impedance stabilization network. This is important
because disturbance in this frequency range is mainly propagated via cables. In
the VHF/UHF range, where radiated disturbance is predominant, the interference
is defined by the disturbance field strength at a certain distance. Small EUTs
mainly emit disturbance via closed cables, e.g. power cables. For this reason
and also to reduce extensive field strength measurements to a minimum, many
standards stipulate the MDS clamp to measure the disturbance power.
Key Facts:
R&SMDS-21 for 30 MHz to 1000 MHz
Calibrated in accordance with CISPR Publ. 16-1-3
R&SMDS-21 with ball bearing rollers for
continuous use in automatic measurements
