Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/~phil/rfi/miscdevice/ivuloto_softek/20121015_ivu-loto_Softek_TxPort.pdf Дата изменения: Sun Mar 31 18:46:43 2013 Дата индексирования: Sun Mar 2 02:01:22 2014 Кодировка: Поисковые слова: trees

RFI Test - IVULOTO Softek TxPort Luis Quintero Arecib o Observatory 15 Oct 2012
1 Intro duction

ETS Model 7405[1] probe No.904: · · · · · Electric field. Res. Freq. >1.0GHz. H/E Rejection 30dB. Performance: Fig. 3. + 15ft coax cable

This document shows RFI test (electric field only) description and results for the two (2) IVULOTO Softek TxPort units for the Visitor Center. Figure 1 shows the device with power supply in the RFI/EMI shielded enclosure. Figure 2 shows the box closed. The numbers indicate the test points, where the electric field probe was located. Test requested by Jorge Rodriguez.

Figure 3: Probe No. 904 Performance.

3

Test Pro cedure · 1U rack mount shielded enclosure with Softek TxPort, power supply, AC filter and shielded Ethernet cables. Tested with the top cover open, and closed. Test points indicated in Figs. 1 and 2. Two Units tested. · Agilent E4445A Spectrum Analyzer preheated for more than 1hour. · Thirty (30) 100MHz bandwidth scans (12.207kHz per channel), from 0 to 3000MHz, electric and magnetic field. · Twenty (20) seconds "integration" time. · Screen/shielded room front door closed. Fluorescent lights OFF. · A/C ON, eth. switch ON, 10MHz buffer OFF, 10MHz ref. cable disconnected. · 430MHz and S-band transmitters OFF.

Figure 1: Shielding Open.

4 Figure 2: Shielding Closed.

Results

2

Test Equipment

Agilent E4445A Spectrum Analyzer: · · · · · · · Trace 1: Clear Write, Average ON, 20 spec. Trace 2: Max Hold. Trace 3: Min Hold. 8192 points per spec. Internal Amplifier ON. 6dB Attenuation. SCPI Commands from Python.

Figure 4 shows the results for the test points 1 (top, power supply) and 2 (bottom, Softek TxPort) for the Unit 1 with the top cover of the enclosure removed. Figure 5 shows the results of points 1 (rear panel, close to the TxPort) and 2 (front panel, close to the network connection) for Unit 1. Figures 6 and 7 show the results of Unit 2 for the open and closed enclosure configurations, respectively. References [1] ETS LINDGREN, ETS Near-Field Probe Set Model 7405.


Figure 4: Electric Field Results, Unit 1, open box. Top: Position 1 (PSU); Bottom: Position 2 (TxPort).


Figure 5: Electric Field Results, Unit 1, closed box. Top: Position 1 (rear); Bottom: Position 2 (front).


Figure 6: Electric Field Results, Unit 2, open box. Top: Position 1 (PSU); Bottom: Position 2 (TxPort).


Figure 7: Electric Field Results, Unit 2, closed box. Top: Position 1 (rear); Bottom: Position 2 (front).