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可用万用表的R×1k或R×100挡测量任意两极之问的正、反向电阻，如果找到一对极的电阻为低阻值(100Ω～lkΩ)，则此时黑表笔所接的为控制极，红表笔所接为阴极，另一个极为阳极。晶闸管共有3个PN结，我们可以通过测量PN结正、反向电阻的大小来判别它的好坏。测量控制极(G)与阴极【C)之间的电阻时，如果正、反向电阻均为零或无穷大，表明控制极短路或断路；测量控制极(G)与阳极(A)之间的电阻时，正、反向电阻读数均应很大；
测量阳极(A)与阴极(C)之间的电阻时，正、反向电阻都应很大。
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订单配送查询 R8C1D7 17-7/8X1IN STAINLESS GEAR DRIVE SHAFT D416382
MARTIN S1027-14 SPUR GEAR 3/4 IN ROUGH BORE 27 TOOTH D435424
DOUGLAS MACHINE F207276 STAINLESS 34-1/2IN LENGTH SHAFT D335791
WORCESTER ConTROLS 1/2CRK44 PM REPAIR KIT D244414
GLR282 STAINLESS 18-7/8IN LENGTH 1-3/8X1-3/16IN OD SHAFT D411592
GLR282 STAINLESS 18-7/8IN LENGTH 1-3/8X1-3/16IN OD SHAFT D411592
STAINLESS VALVE STEM 14-5/8 IN 3-1/16 IN OD D424766
27-1/2X1-9/16IN STEEL SHAFT REPLACEMENT PART D247794
GRACO 167479 VALVE PLATE 3-1/4X7/8X1/8IN STAINLESS REPLACEMENT PART D264309
ALVEY 7007757 27-1/2X1-7/8IN ConVEYOR ROLLER G196 GH N 13 28.00 NC G D297515
TRIPLE S DYNAMICS 11000-1454-1 ALUMINUM OPEN END ConVEYOR COVER 4IN OD D412454
BOSTON GEAR 55227 XBP-157 BORE PLUG 1-9/16X1/4IN REPLACEMENT PART D330693
WSG 10MTX20 CARBON ELEMENT FOR FILTER 20X2.5 IN REPLACEMENT PART B251328
DOUGLAS MACHINE F26907A ARM 1-1/2 IN X 7 IN X 5/8 IN ZINC PLATED CS D393951
VANTON PUMP B3007878 PUMP SHAFT W/SLEEVE D481808
BIKON 4000-IN LOCKING ASSEMBLY 2-3/8IN REPLACEMENT PART D367055
OSBORN 26047 SET OF 12 KNOTTED WIRE WHEELS 6IN 1/2X0.025X5/8IN 11AH D515122
MARTIN TS872NI 72 TOOTH 5-1/2IN BORE 9-1/4IN OD GEAR D245599
TGW-ERMANC 90895000 UNIVERSAL JOINT ConVEYOR REPLACEMENT PART 1IN D244876
DIAMOND A-83334-28-2 ROLLER link STEEL CHAIN REPLACEMENT PART D319191
URSCHEL 53201 21-7/8X1-1/8IN STEEL SHAFT REPLACEMENT PART D247173
RA JonES 452795 28-1/8X1-3/8IN STEEL SPLINE CARTON SHAFT D269566
SIGNODE 275131 71 X 10MM STUB SHAFT D438861
PARKER 200389 A4A/S4A REPLACEMENT PART D419046
PARKER L065120000 CUSH KIT GRP 1 PNEUMATIC CYLINDER REPLACEMENT PART B397041
ATLAS ABRASIVE C16-PB1 TAPERED GRINDING WHEEL D483635
FORMAX 3027-1002 CASE COVER ALUMINUM 6IN GEAR REPLACEMENT PART D262676
42C368S-3 48TOOTH 1IN BORE GEAR D340788
PRATER INDUSTRIES 3NA320201 ROTOR SHAFT KEYWAY STEEL D271655
910723103901 D-0 2-1/8IN BORE STEEL HELICAL GEAR REPLACEMENT PART D358961
FORMAX 15101 STEEL SPUR GEAR 1-1/2IN BORE D321556
SKF SNW 117X2-15/16 ADAPTER D325627
SP230AF 6K25 646793400 10 TON HOIST BRAKE SHOE SET D480535
ATRA-FLEX A-2 COUPLING RING D435050
REULAND 43203-830 1-3/8IN SPUR GEAR D503863
KHS-BARTELT 12341-6 ConTROL CAM 1-1/2IN BORE D223434
JORDAN PLEV89630 108963B DIAPHRAGM SET D424251
ATRA-FLEX M1 MILLENNIUM RED HIGH TEMP FLEXIBLE INSERT D499801
TAYLOR INSTRUMENT 61S738-20 PRESSURE TRANSMITTER REPLACEMENT PART D418756
MAC 100983 VALVE SLEEVE 6IN ID 8IN OD 13 IN LONG REPLACEMENT PART D231153
ERMANCO 40215909 12-3/4IN ROLLER ConVEYOR REPLACEMENT PART D360860
REEVES D4100-006 VARIABLE SPEED DRIVE DISC PULLEYS D366885
PHILIPS 705B-60L SPRING 33X26X100X4MM D252354