BIO RAD PER3800C
BIO RAD PER3800C
BIO RAD PER3800C
BIO RAD PER3800C增量編碼器信號(hào)絕大部分為方波高頻率脈沖信號(hào)(另有正余弦信號(hào)不在此討論),這樣的信號(hào)對(duì)增量編碼器信號(hào)電纜要求并非簡(jiǎn)單的線徑粗細(xì)和雙絞屏蔽的要求,而是對(duì)于線間電容、電感以及材質(zhì)對(duì)于波能量的吸收和反射,信號(hào)電纜都必須有專門的設(shè)計(jì)與試驗(yàn)。電纜芯線的粗細(xì)僅僅是針對(duì)電流的大小,而雙絞屏蔽(甚至雙層屏蔽)也僅僅是針對(duì)外部的影響。事實(shí)上編碼器信號(hào)(ABZ)本身在傳導(dǎo)與接收時(shí)就會(huì)發(fā)生物理變化,在傳導(dǎo)過(guò)程中由于線間電容與電感及材質(zhì)對(duì)于波能量吸收的影響,波形會(huì)變形失真,上升沿與下降沿不再陡直,方波變成了饅頭波;而當(dāng)信號(hào)進(jìn)入接收端會(huì)發(fā)生反射,事實(shí)上任何電磁波信號(hào)在兩個(gè)界面的過(guò)程中都會(huì)發(fā)生折射與反射,就好比光波進(jìn)入水面的折射和反射一樣,這樣的反射波會(huì)在原來(lái)脈沖信號(hào)上疊加出多出來(lái)的小脈沖;
另外當(dāng)A相的上升與下降會(huì)對(duì)于B相產(chǎn)生影響,同樣B相信號(hào)的上升與下降也會(huì)對(duì)于A相產(chǎn)生影響,上述在電纜傳導(dǎo)與接收端的內(nèi)部信號(hào)各種物理變化,隨著電纜線的長(zhǎng)度加長(zhǎng),或外部干擾的影響,失真會(huì)越來(lái)越嚴(yán)重,波形也會(huì)越來(lái)越雜亂,后造成接收端接收脈沖信號(hào)的不準(zhǔn)確。
這種現(xiàn)象好比在山谷中的回聲,當(dāng)反射距離達(dá)到一定回聲會(huì)很明顯,當(dāng)2個(gè)人以上的發(fā)聲回聲會(huì)雜亂,而當(dāng)距離很遠(yuǎn)或人更多時(shí),回聲已經(jīng)無(wú)法分辨了。
CUTLER HAMMER MCP03150R
WESTINGHOUSE MOLDED CASE CIRCUIT BREAKER 20A 480VAC 250VDC 2P EH2020 <854ER11
SWAGELOK SS-6PNDGM8-F8
CROSS 4" SCHEDULE 40 BUTTWELD WPB STEEL PIPE FITTING <169WH
CROSS 3" SCHEDULE 40 BUTTWELD WPB STEEL PIPE FITTING <168WH
CROSS 2" SCHEDULE 40 BUTTWELD WPB STEEL PIPE FITTING <167WH
SWAGELOK SS-600-4
GE TEB122015
PARKER FEMALE CONNECTOR 5/8" TUBE x 3/4" NPT 316SS TUBE FITTING <10CF12
NEEDLE 8A-V6LR-SS
NEEDLE VALVE MINI 1/4" MALE x MALE NPT CARBON STEEL 6000 PSI <560IN06
HOKE GYROLOK 4LF8-316
HOKE 4AF8-316
HOKE 6CF8-316
SWAGELOK SS-8-
HOKE 8SLP-316
THERMOMETER 3" FACE 2-1/2" STEM 0-250 DEGREE F/C 1/2 NPT BACK HOBREWING 945P4
THERMOMETER 3" FACE 2-1/2" STEM 50-550*F BBQ PITTS <940P4
Needle Valve 90° Angle 1/4" Male NPT x 1/4" Female NPT 6000 PSI STEEL <463IN06
BRASS BALL VALVE 1/2" FEMALE NPT 600# WOG FULL PORT PLUMBING, FLUIDS <843WH
ROSEMOUNT 3051 CD1A02A1AE5H2
ROSEMOUNT 3051S1CG3A2F12AB1E5
ASCO SOLENOID VALVE BRASS 2" NPT ASCO 8210G46 ORIFICE 1 3/4" 12V DC <637I1
SWAGELOK SS-400-9
90* HOSE BARB 5/8" HOSE ID X 1/2" MPT HEX BODY 316 SS HOBREWING <HB630
NEEDLE HNVS8M8FPK
SIGHT FLOW INDICATOR 2" 600 RF FLANGED 316SS JACOBY TARBOX F910HPA <900WH
11/4" X 1/2" 150 304 STAINLESS STEEL BELL REDUCER COUPLER FEMALE NPT <571WH
ROSEMOUNT 3051S1CG3A2A11A1AE5
ROSEMOUNT 3051S1CD5A2F12A1AE5
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3/8" NPT HOBREWING <717WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 2" NPT HOBREWING <718WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3/4" NPT HOBREWING <711WH
2-1/2" LONG RADIUS 90 DEGREE ELBOW SCHEDULE 40 BUTTWELD WPB PIPE FITTING <007WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1" NPT HOBREWING <712WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3" NPT HOBREWING <720WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1-1/4" NPT HOBREWING <715WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1-1/2" NPT HOMW BREWING <716WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1/4" NPT HOBREWING <714WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1/2" NPT HOBREWING <710WH
FORGED STEEL 2" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING <FS2009
FORGED STEEL 1" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING <FS2006
FORGED STEEL 1/2" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING <FS2004
WESTINGHOUSE MOLDED CASE CIRCUIT BREAKER 20A 480VAC 250VDC 2P EH2020 <854ER11
SWAGELOK SS-6PNDGM8-F8
CROSS 4" SCHEDULE 40 BUTTWELD WPB STEEL PIPE FITTING <169WH
CROSS 3" SCHEDULE 40 BUTTWELD WPB STEEL PIPE FITTING <168WH
CROSS 2" SCHEDULE 40 BUTTWELD WPB STEEL PIPE FITTING <167WH
SWAGELOK SS-600-4
GE TEB122015
PARKER FEMALE CONNECTOR 5/8" TUBE x 3/4" NPT 316SS TUBE FITTING <10CF12
NEEDLE 8A-V6LR-SS
NEEDLE VALVE MINI 1/4" MALE x MALE NPT CARBON STEEL 6000 PSI <560IN06
HOKE GYROLOK 4LF8-316
HOKE 4AF8-316
HOKE 6CF8-316
SWAGELOK SS-8-
HOKE 8SLP-316
THERMOMETER 3" FACE 2-1/2" STEM 0-250 DEGREE F/C 1/2 NPT BACK HOBREWING 945P4
THERMOMETER 3" FACE 2-1/2" STEM 50-550*F BBQ PITTS <940P4
Needle Valve 90° Angle 1/4" Male NPT x 1/4" Female NPT 6000 PSI STEEL <463IN06
BRASS BALL VALVE 1/2" FEMALE NPT 600# WOG FULL PORT PLUMBING, FLUIDS <843WH
ROSEMOUNT 3051 CD1A02A1AE5H2
ROSEMOUNT 3051S1CG3A2F12AB1E5
ASCO SOLENOID VALVE BRASS 2" NPT ASCO 8210G46 ORIFICE 1 3/4" 12V DC <637I1
SWAGELOK SS-400-9
90* HOSE BARB 5/8" HOSE ID X 1/2" MPT HEX BODY 316 SS HOBREWING <HB630
NEEDLE HNVS8M8FPK
SIGHT FLOW INDICATOR 2" 600 RF FLANGED 316SS JACOBY TARBOX F910HPA <900WH
11/4" X 1/2" 150 304 STAINLESS STEEL BELL REDUCER COUPLER FEMALE NPT <571WH
ROSEMOUNT 3051S1CG3A2A11A1AE5
ROSEMOUNT 3051S1CD5A2F12A1AE5
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3/8" NPT HOBREWING <717WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 2" NPT HOBREWING <718WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3/4" NPT HOBREWING <711WH
2-1/2" LONG RADIUS 90 DEGREE ELBOW SCHEDULE 40 BUTTWELD WPB PIPE FITTING <007WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1" NPT HOBREWING <712WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 3" NPT HOBREWING <720WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1-1/4" NPT HOBREWING <715WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1-1/2" NPT HOMW BREWING <716WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1/4" NPT HOBREWING <714WH
90 DEGREE ELBOW 150# 304 STAINLESS STEEL 1/2" NPT HOBREWING <710WH
FORGED STEEL 2" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING <FS2009
FORGED STEEL 1" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING <FS2006
FORGED STEEL 1/2" 3000# SOCKET WELD 90 DEGREE ELBOW A105 PIPE FITTING <FS2004