无论是哪一种变频器，都大量使用了晶闸管等非线性电力电子元件，不管采用哪种整流方式，变频器从电网中吸取能量的方式都不是连续的正弦波，而是从脉动的断续方式向电网索取电流，这种脉动电流和电网的沿路阻抗共同形成脉动电压降叠加在电网的电压上，使电压发生畸变，经傅立叶原理分析可知，这种非同期正弦波电流是由于频率相同的基波和频率大于基波频率的谐波组成。

SPECTRA PHYSICS LASER NEWPORT POLARIZER MOTORIZED STAGE

NEWPORT THK MOTORIZED LM GUIDE ACTUATOR LASER MOUNT

DIALOGIC CPI/400-1T1 PCI VOIP DM3 BOARD CPI/400-T1

INDUSTRIAL HAND PUNCH PRESS MACHINE / TEMP CONTROLLERS

LINOS POCKELS CELL KDP LASER Q-SWITCH NdiYag LM10-SG-SP

CISCO PIX-515E-R-DMZ FIREWALL VPN WITH CABLES COMPLETE

CHAMPION 7-BAY TOWER CD BURNER DUPLICATOR / FREE SHIP

KLA TENCOR LOADER BRUSHLESS DC SERVO MOTOR RELIANCE

DAINIPPON SCREEN OPERATOR LCD MonITOR KEYBOARD PORTABLE

HARVARD APPARATUS PHD-2000 HPSI SYRINGE PUMP CONTROLLER

BLUE-M STABIL-THERM OV-472A-2 LAB OVEN POWER-O-MATIC 70

LOT 5 TECAN CAVRO SYRINGE PUMP MOTORIZED INJECTOR VALVE

CHAMPION 7-BAY TOWER CD DUPLICATOR BURNER / FREE SHIP

LOT 3 SORRENTO GigaMux MODULES GMMD-G8 GMCR-2.5G GMAD

ArthroCare ARTHROSCOPIC ELECTROSURGERY 2000 /FOOT PEDAL

ABB ACH501 ADJUSTABLE FREQUENCY AC DRIVE 3-HP ACH500

NEW Duncan Ceramic Kiln Crafter Oven Pottery Craft Auto