A low-noise multiresolution high-dynamic ultra-broad-band time-domain EMI measurement system

2005 ◽  
Vol 53 (11) ◽  
pp. 3354-3363 ◽  
Author(s):  
S. Braun ◽  
P. Russer
Keyword(s):  
Measurement System ◽  
Time Domain ◽  
Broad Band ◽  
Low Noise ◽  
High Dynamic

scholarly journals A low-noise high dynamic-range time-domain EMI measurement system for CISPR Band E

2011 ◽  
Vol 9 ◽  
pp. 309-315
Author(s):  
C. Hoffmann ◽  
P. Russer
Keyword(s):  
Real Time ◽  
Measurement System ◽  
Time Domain ◽  
Dynamic Range ◽  
Digital Signal ◽  
High Dynamic Range ◽  
Low Noise ◽  
Noise Floor ◽  
Multi Stage ◽  
Analog To Digital Conversion

Abstract. In this paper, a broadband time-domain EMI measurement system for measurements from 9 kHz to 18 GHz is presented that allows for compliant EMI measurements in CISPR Band E. Combining ultra-fast analog-to-digital-conversion and real-time digital signal processing on a field-programmable-gate-array (FPGA) with ultra-broadband multi-stage down-conversion, scan times can be reduced by several orders of magnitude in comparison to a traditional heterodyne EMI-receiver. The ultra-low system noise floor of 6–8 dB and the real-time spectrogram allow for the characterisation of the time-behaviour of EMI near the noise floor. EMI measurements of electronic consumer devices and electric household appliances are presented.

scholarly journals Measurement of electromagnetic interference in time-domain

2008 ◽  
Vol 6 ◽  
pp. 311-313 ◽  
Author(s):  
S. Braun ◽  
A. Frech ◽  
P. Russer
Keyword(s):  
Real Time ◽  
Measurement System ◽  
Time Domain ◽  
Electromagnetic Interference ◽  
Dynamic Range ◽  
Operating Time ◽  
Low Noise ◽  
Measurement Time ◽  
Noise Power ◽  
Processing Unit

Abstract. Time-domain EMI measurement systems allow measurement time to be reduced by several orders of magnitude. In this paper a novel real-time operating time-domain EMI measurement system is presented. By the use of several analog-to-digital converters the dynamic range requested by the international EMC standards is achieved. A real-time operating digital signal processing unit is presented. The frequency band that is investigated is subdivided into several sub-bands. A novel implementation of the 9 kHz IF filter for the frequency 150 kHz to 1 GHz is presented. By this way the measurement time has been reduced by a factor of 8000 in comparison to conventional EMI receivers. During emission measurements performed with a modelled IF-bandwidth of 9 kHz the noise floor is decreased to −19 dBµV in the average detector mode by the implemented low noise power splitter. Measurements have been performed with the improved measurement system in the frequency range 30 MHz–1 GHz.

Low Noise Closed-Cycle Helium Re-Condensing for SQUID Biomagnetic Measurement System

2015 ◽  
Author(s):  
Yoshiaki Adachi ◽  
Daisuke Oyama ◽  
Jun Kawai ◽  
Jun-ichi Fujihira ◽  
Gen Uehara ◽  
...  
Keyword(s):  
Measurement System ◽  
Low Noise ◽  
Closed Cycle
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