RELIANCE 45C400反射計(jì)電路

　　用RELIANCE 45C400還可構(gòu)成反射計(jì)（Reflect Meter），通過(guò)測(cè)量入射到負(fù)載的信號(hào)和從負(fù)載反射的信號(hào)的增益及相位差，zui終計(jì)算出反射系數(shù)γ。反射系數(shù)的計(jì)算公式為

　　RELIANCE 45C400式中，ZL是用復(fù)數(shù)表示的負(fù)載阻抗，Z0是系統(tǒng)的特征阻抗。反射系數(shù)常常用來(lái)計(jì)算阻抗失配程度及駐波比（SWR）。反射系數(shù)通常用分貝表示。

　　由RELIANCE 45C400構(gòu)成反射計(jì)的電路如圖5所示，該電路可以測(cè)量反射系數(shù)。反射計(jì)包括20dB電阻衰減器和1dB電阻衰減器，由阻容元件構(gòu)成的一對(duì)定向耦合器A和B可對(duì)入射信號(hào)和反射信號(hào)進(jìn)行采樣。A、B通道的耦合系數(shù)和衰減系數(shù)分別由下式確定：

　　RELIANCE 45C400式中，γNOM為標(biāo)定反射系數(shù)，單位是dB，對(duì)無(wú)源負(fù)載而言，該系數(shù)為負(fù)值。當(dāng)輸入信號(hào)為10dB和標(biāo)定反射系數(shù)為－19dB時(shí)，可使用一對(duì)20dB的耦合器，當(dāng)POPT＝330dBm時(shí)，衰減器A和B的衰減量分別為1dB和2dB。當(dāng)增益靈敏度為30mV/dB，相位差靈敏度為10mV/度時(shí)，UMAC端和UPHS端分別輸出被測(cè)反射系數(shù)γ的幅度信號(hào)和相位信號(hào)。當(dāng)γ＝－19dB時(shí)，UMAG端的輸出為900mV。

ABB DSQC 253 PLC Board 3HNE 01695-1 3E 042808

ABB Soft Starter PSR45-600-81 (PSR4560081) NIB

ABB 3HAA3563-ARA SEVO BACKPLANE 3HAA3563ARA 

ABB ACS143-4K1-1-U 240V AC DRIVE 3HP 3PH. NEW.

ABB Contactor, EK175 SK826-400AL, 220-230V, 50Hz

ABB S203UP-Z2

ABB Across Contactor A210-30-11 AC220V (A2103011AC220V?)

ABB Power Capacitor C484D3.5-3FI, 3 Phase, #7144 

ABB Mechanical Motor Kit, ISDAO1416R1, S7, 120-127V

ABB Power Factor Controller RVC-6 RVC 6 Free Ship

One ACS400 Series ABB Inverter CPU Board SNAT4041C 

One ABB ACS800 Driver Board RINT-5311C 

ABB Inverter ACS101-K75-1-C w/ Operator

ABB Commander 100 C100 Controller Free Ship

Display Mannequin Manikin Manequin Dress Form ABB-Group

Enlarge
ABB Digital I/O Board YB560103BD Circuit Board

ABB Capacitor, 10KVAR, #C484G10-3LE, 3 PH 480 VAC Used

ABB 70 Amp Circuit Breaker

ABB Parajust F00332A40 AC Drive S7

ABB EHW 160 SIZE W4 WELDING ISOLATION CONTACTOR

ABB Circuit Board DSQC 129 YB161102-BV Used

Asea ABB SLCE 12-25 478S 040-RG 300VAC Transformer NIB

?