Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/~phil/rfi/miscdevice/trlaser/luisQuintero_llb500_20110615_laser.pdf Дата изменения: Tue Jun 21 01:52:05 2011 Дата индексирования: Tue Feb 5 23:03:35 2013 Кодировка: Поисковые слова: mdi

RFI Test - TR Electronic LLB500 Laser Luis Quintero, Yolian Amaro NAIC Arecib o Observatory 15 June 2011
1 Equipment list

Equipment: · TR Electronic LLB500-00600 · Serial Number: 04140014 Spectrum Analyzer: · Agilent E4445A Spectrum Analyzer, 601 channels, pre-amp on. ETS Model 7405 probes[1]:

Table 1: Frequency Ranges, CF=Center Freq. Band No. CF (GHz) BW (GHz) 18 0.1250 0.2500 19 0.3750 0.2500 20 0.6250 0.2500 0.8750 0.2500 21 22 1.1250 0.2500 1.3750 0.2500 23 24 1.6250 0.2500 1.8750 0.2500 25 26 2.1250 0.2500 2.3750 0.2500 27

Figure 2 shows the results obtained with the previous · Magnetic field, No. 902, Res. Freq. 1.5GH z , H/E model of the LLB500 (RFI test of 23 Apr 2010) and the LLB500. Figure 3 show the results of electric field only Rejection 29dB. · Electric field, No. 904, Res. Freq. > 1GH z , H/E for the LLB500. Rejection 30dB. 4 Conclusions Pro cedure and Frequency Ranges · Make sure that your coax cable is ok before the test!! · RFI everywhere, take care with this equipment, it can produce cancer...

2

Figure 1 shows the TR Electronic LLB500-00600 laser ranging system. We used a DC Power Supply regulated to 24VDC, and a laptop computer was taking power readings of the laser while the RFI test was running. References Blue circles show RFI hot-spots. [1] ETS LINDGREN, ETS Near-Field Probe Set Model 7405.

Figure 1: TR Electronic LLB500-00600. The LLB500 was tested in the frequency ranges of Table 1. All the spans were fixed to 250MHz (416kHz channel bandwidth - BW) for this test. 3 Results

Please, check the results in these files: · Probe No. 902: 20110615 laser 902.pdf · Probe No. 904: 20110615 laser 904.pdf


(a)

(b)

Figure 2: Magnetic Field, (a) Previous model, (b) LLB500.


Figure 3: Electric Field of LLB500