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干擾類(lèi)型通常按干擾產(chǎn)生的原因、噪聲的干擾模式和噪聲的波形性質(zhì)的不同劃分。其中：按噪聲產(chǎn)生的原因不同，分為放電噪聲、浪涌噪聲、高頻振蕩噪聲等；按噪聲的波形、性質(zhì)不同，分為持續(xù)噪聲、偶發(fā)噪聲等；按聲音干擾模式不同，分為共模干擾和差模干擾。共模干擾和差模干擾是一種比較常用的分類(lèi)方法。共模干擾是信號(hào)對(duì)地面的電位差，主要由電網(wǎng)串入、地電位差及空間電磁輻射在信號(hào)線上感應(yīng)的共態(tài)（同方向）電壓送加所形成。

：張亮（工程師）    專(zhuān)線：
24小時(shí)移動(dòng)專(zhuān)線：         【】

共模電壓有時(shí)較大，特別是采用隔離性能差的電器供電室，變送器輸出信號(hào)的共模電壓普遍較高，有的可高達(dá)130V以上。共模電壓通過(guò)不對(duì)稱(chēng)電路可轉(zhuǎn)換成差模電壓，直接影響測(cè)控信號(hào)，造成元器件損壞（這就是一些系統(tǒng)I/O模件損壞率較高的原因），這種共模干擾可為直流、亦可為交流。差模干擾是指用于信號(hào)兩極間得干擾電壓，主要由空間電磁場(chǎng)在信號(hào)間耦合感應(yīng)及由不平衡電路轉(zhuǎn)換共模干擾所形成的電壓，這種讓直接疊加在信號(hào)上，直接影響測(cè)量與控制精度。

GE FANUC IC697BEM731L GENIUS BUS CONTROLLER 1 CHANNEL I

INDRAMAT 109-0785-4814-06 PC BOARD X11RX S2 LOW S3 HIGH

CONTINENTAL HYDRAULICS ED05M-3A10-GB-24L-C VALVE 

WESTINGHOUSE 233P734H01H CONTROLLER MODULE H15A 1870A76

VAN DORN 330021 TEMPERATURE BOARD REV. B

VAN DORN 330034 PC BOARD ASSEMBLY REV. C

ALLEN BRADLEY 505V-COD-23 SER. C 505VCOD23 STARTER NIB

POLYSPEDE FHP-100 ADJUSTABLE SPEED DRIVE SYSTEM HP SERI

BIHLER PR-5007-P MODULE

NIB SIEMENS 6GK73431EX000XE0 COMMUNICATION MODULE

ADVANTAGE ELECTRONICS 3025 CPU BOARD REV. A

RELIANCE ELECTRIC 0-52859-2 DRIVE BOARD 0528592  IN 

CKD NAB1W-80F-0 VALVE NAB1W80F0 NIB

ORMEC ORN-DSP-AQ/2D SERVOWIRE AXIS MODULE ORNDSPAQ2D

NIB ALLEN BRADLEY 512-BJB-6PA STARTER NEMA1 512BJB6PA

PC INDUSTRIES ELS400 ELECTRONIC LINE SHAFT

MODICON DIVISION AS-M485-004 MEMORY BOARD 4K W/BATTERIE

HOHNER PA021791000 ENCODER PA02179/1000

 IDI 101043-001 TEST SPRING PROBE CAT. NO: SH-5-H-18

ALLEN BRADLEY 1772-ME16 RAM MEMORY MODULE 16K WORDS 177

 SIEMENS 6ES73552CH000AE0 TEMPERATURE CONTROL FM355-

VALMET M851004 M2 CPU MODULE M851004M2

SANKYO AC SERVO SYSTEM W-L01170DM20R04 POWER SUPPLY

RAYTEK RAYET2LTSFJ THERMOPILE SENSOR

 SIEMENS 6ES7326-2BF01-0AB0 SIMATIC S7 MODULE DO 10x

GUARDSCAN DIAGNOSTIC KIT 231991

RELIANCE ELECTRIC CARDPAK D-49011-6A DRIVER

NIB EMECANIQUE XGPA312D70 ANTENNA XGP A312D70

LINCOLN ELECTRIC G2862-1 DISPLAY/KEYPAD BOARD G28621

CKD NAB2W-80F-0 VALVE NAB2W80F0 NIB

 CONTRAVES 707961-1 POSITION CONTROLLER

PARKER P5T-H100DHSE075 CYLINDER P5TH100DHSE075 

HUBBELL HBL430MIF7W CIRCUIT-LOCK PIN & SLEEVE F ME

ENERPAC MV722B PO CHECK VALVE W/ ACCUMULATOR NIB

SIEMENS SIMATIC 6ES5434-4UA11 INPUT MODULE 32 POINT

 HARDINGE TT0001990GA PLATE GUIDE ASSEMBLY

ABB SNAT-7070 CONTROL BOARD 7070IHH3520094 TYPE: SNAT70

NIB MITSUBISHI FX2N-32MR-UA1/UL PROGRAMMABLE CONTROLLER

NIB SCHNEIDER ELECTRIC TSX-FPP-20 COMMUNICATION FIPWAY 
  

FANUC A20B-1000-0560/11F SERVO ANALOG BOARD

NSK N1016BTKRCC1P4 SUPER PRECISION CYLINDRICAL ROLLER B

TEDEA HUNTLEIGH MODEL 9010 DAMPED LOAD CELL NIB

INGERSOLL RAND 93969939 DC MOTOR SYSTEM

NORGREN VMS-2110-24 VMS 2110 SMART PUMP VACUUM PUMP VMS

IDC TM90CPU REV. H PROCESSING BOARD 9/2001 TM90CPU-94 N

PULSAFEEDER BOILER PROBE 16-972-13 16-972-14 

PROSOFT 1560-MBP MODBUS PLUS INTERFACE 1560MBP 

MEDAR 900-6454-6M1 FIRING BOARD 3000/200 15POS 90064546

MEDAR 900-6454-5M4 FIRING BOARD 90064545M4 

 EMERSON TP-30H X1 POWER TRANSMISSION PART TP30HX1

EAGLE SIGNAL CP713L1 LOAD TRACK DRIVER

MARPOSS 3404995829 SWITCH 34-04995-829 REPAIRED

NIB F/S CONTROL TECHNIQUES NTE-207-CONS-0000 SERVO MOTO

AERO-MOTIVE SR-306 SLIP RING ASSEMBLY SR306 

ISSC 300-344-24D ID/N D-16-12-275 REV. B M/N 344-24D2-P

NARDA 8850 INDUCED CURRENT METER 3KHz TO 110MHz

NIB BELL & GOSSETT 169092 POWER PACK AC MOTOR

FANUC A16B-1212-0930/06B CONTROL BOARD E-STOP REPAIRED

VALMET METSO AUTOMATION A413042 40 32M CPU BOARD

RELIANCE ELECTRIC 0-51847-4 VLDE MODULE 0518474 NIB

GE FANUC IC600CM548K 8K LOGIC MEMORY MODULE IC600-CM548

GE FUJI ELECTRIC OPC-G11S-PDP PROFIBUS-DP CARD OPCG11SP

TRIAC CONTROLS ETI-700 ELECTRIC ACTUATOR ETI700 

SET OF STI MS4300 LIGHT CURTAINS MS4324BX / MS4324BR

GE FANUC IC610CCM105D UL DATA COMMUNICATIONS UNIT NIB

BETA TECH BC-FSC-072-001/BC-NULL-011-001 SPINDLE CARD B

BETA TECH BC-FSC-071-003/BC-NULL-011-001 SPINDLE CARD B

ALLEN BRADLEY 1756-ENBT A ETHERNET/IP 10/100 Mb/s A02 1

ALLEN BRADLEY 1756-ENBT A ETHERNET/IP 10/100 Mb/s A03 1

MKS BARATRON 120AD-00001RCU MANOMETER 120AD00001RCU

CSR CONTRAVES A1521 NC 400 DC SERVO CONTROLLER

 BRUNSWICK SCIENTIFIC M1181-3022 DO/PH AMP ASSEMBLY 

RELIANCE ELECTRIC 0-57160 REGULATOR CARD 057160

NIB MARS 48 INCH AIR DOOR MODEL 48 STYLE 2448 (97)

CHROMALOX RADD-6604 480V 600W RADIANT HEATER RADD6604

ALLEN BRADLEY 1336F-BRF10-AN-EN DRIVE 1336FBRF10ANEN

NEXEN 910211 5H45P-1 1.438 BORE PILOT MOUNT NIB

STANLEY AF-SERVO-040-001 SERVO DRIVE S/N: 053100119, 10

MKS 937A GAUGE CONTROLLER 937A-120V60TR-CCPRPR-PF 120VA

 SQUARE D FAL340601380 MOLDED CASE CIRCUIT BREAKER 4

JOHNSON 3500SB 1-1/2 RH D.I. SUPER-B JOINT 16A66600 NIB

LOT OF 7  WATLOW AF-2019479 THERMO COUPLES AF2019479

IAI ROBO CYLINDER RCP2-RMA-I-PM-8-100-P1-S-FT ACTUATOR

Z AXIS INC V209AM020 MONITOR CRT 12VDC 1.50ADC MAX 9IN 

BROWNING POWERLINE STYLE C140, SIZE 2203, MTG B, POS H1