Position Measurement of an Absorber Clamp
Position Measurement of an Absorber Clamp
Chun Hao Ng
University of South Australia/ School of Electrical and Information Engineering, Mawson Lakes, Australia
NGYCH007@students.unisa.edu.au
+61433180430
Abstract —This paper reports on the development of the Remote Sensing of an Absorber Clamp system. An overview of the implementation method and background reasoning is given on the developed system.
Index Terms— Rotary Encoders, Position Measurement, Electromagnetic Compatibility, Sensors, Transducer
I. INTRODUCTION
Electromagnetic compatibility (EMC) has been around since the early 1950s, predominantly regarding the motorised noise conducted over the power lines to sensitive equipments. [1] With the advancement of digital circuits, the switching speeds of equipments have increased dramatically. Since electromagnetic interference is caused by the changes in current with respect to time, the increase of switching frequency will cause false logic switching and improper operation of devices. [1] Wireless technologies and congestions of communication bands have also contribute to the awareness towards electromagnetic compatibility. [3]
The system being developed on is a motorised absorber clamp which moves along a rail detecting the radiated electromagnetic interferences (EMI) radiated from the equipment under test (EUT) trough its connecting cables. Given that the whole testing is done in a screen room, it is somewhat tedious to manually pin-point the exact location of maximum disturbance.
The absorber clamp consist of 36 sets of halved ferrite ring cores, 34 sets which acts as a current transformer and 2 sets which acts as an EMI measuring receivers, as seen in figure 1.
Figure 1. MDS-21 Absorbing Clamp
To measure the disturbance power, the cable under test is inserted horizontally so that the absorbing clamp surrounding the cable can be easily slid along the cable. Since there is no matching between the disturbance source, the
Chun Hao Ng
University of South Australia/ School of Electrical and Information Engineering, Mawson Lakes, Australia
NGYCH007@students.unisa.edu.au
+61433180430
Abstract —This paper reports on the development of the Remote Sensing of an Absorber Clamp system. An overview of the implementation method and background reasoning is given on the developed system.
Index Terms— Rotary Encoders, Position Measurement, Electromagnetic Compatibility, Sensors, Transducer
I. INTRODUCTION
Electromagnetic compatibility (EMC) has been around since the early 1950s, predominantly regarding the motorised noise conducted over the power lines to sensitive equipments. [1] With the advancement of digital circuits, the switching speeds of equipments have increased dramatically. Since electromagnetic interference is caused by the changes in current with respect to time, the increase of switching frequency will cause false logic switching and improper operation of devices. [1] Wireless technologies and congestions of communication bands have also contribute to the awareness towards electromagnetic compatibility. [3]
The system being developed on is a motorised absorber clamp which moves along a rail detecting the radiated electromagnetic interferences (EMI) radiated from the equipment under test (EUT) trough its connecting cables. Given that the whole testing is done in a screen room, it is somewhat tedious to manually pin-point the exact location of maximum disturbance.
The absorber clamp consist of 36 sets of halved ferrite ring cores, 34 sets which acts as a current transformer and 2 sets which acts as an EMI measuring receivers, as seen in figure 1.
Figure 1. MDS-21 Absorbing Clamp
To measure the disturbance power, the cable under test is inserted horizontally so that the absorbing clamp surrounding the cable can be easily slid along the cable. Since there is no matching between the disturbance source, the