1734-OW4+++1734-OW4

+++

干扰类型通常按干扰产生的原因、噪声的干扰模式和噪声的波形性质的不同划分。其中：按噪声产生的原因不同，分为放电噪声、浪涌噪声、高频振荡噪声等；按噪声的波形、性质不同，分为持续噪声、偶发噪声等；按声音干扰模式不同，分为共模干扰和差模干扰。共模干扰和差模干扰是一种比较常用的分类方法。共模干扰是信号对地面的电位差，主要由电网串入、地电位差及空间电磁辐射在信号线上感应的共态（同方向）电压送加所形成。

：张亮（工程师）    专线：
24小时移动专线：         【】

共模电压有时较大，特别是采用隔离性能差的电器供电室，变送器输出信号的共模电压普遍较高，有的可高达130V以上。共模电压通过不对称电路可转换成差模电压，直接影响测控信号，造成元器件损坏（这就是一些系统I/O模件损坏率较高的原因），这种共模干扰可为直流、亦可为交流。差模干扰是指用于信号两极间得干扰电压，主要由空间电磁场在信号间耦合感应及由不平衡电路转换共模干扰所形成的电压，这种让直接叠加在信号上，直接影响测量与控制精度。

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