MPL-B520K-MJ74AA步進電機噪音和振動的另外一個來源是傳統(tǒng)的斬波方式和脈寬調制(PWM)模式，因為比較粗的步距分辨率是產生振動和噪音的主要因素，我們通常忽視了斬波和PWM帶來的問題。傳統(tǒng)的恒定PWM斬波模式是電流控制的PWM斬波模式，該模式在快速衰減和慢速衰減之間有個固定關系，在其大數值的時候，電流才會達到規(guī)定的目標電流，終導致平均電流是小于預期目標電流的。

MPL-B520K-MJ74AA 

Balzers TSU 065D 

Koolant Koolers KV2000 

Blue M WSP-109B-3 

ENI POWER SYSTEMS OEM-25 

HP 35665A

HP 4380A 500 

Dukane 410 

Millipore Waters Quanta 4000E

HP Agilent 5183U 

Edwards High Vacuum Pump 

Knight Tool Co. KTC-FT-62 Press

HP 55300A

Ideal 3915-95 Guilotine,

Union Special 35800 

Agilent E1439A 

Standard Environmental Systems STB/1C

Patterson Kelley LB-10555

HP 16190A Performance Test Kit, Complete

HP 16453A Dielectric Material Test Fixture

Orec Model 03DM-100 

HP/Agilent 8566A 

ZES Zimmer LMG95 Single Phase Precision Power Meter

Beijing Huija Automation Component Counter

Wiltron 6647A Programmable Sweep Generator

Tektronix SJ300E SDHv

Ultratech 602

Olympus SZ6045 

Dukane Lot of Qty 2 43A240

Agilent 53310A 

Rheometrics RSA 2 Solids Dynamic Mechanical Analyzer

Schlumberger Solartron 7081 Precision Voltmeter

Microtrac FRA 9250 Particle Size Analyzer

JetStat CPI VKU-7820A8

Buehler Fibrmet Optical 

LeCroy 9354M Digital Oscilloscope 

IRD 350 Vibration Analyzer 

HP Agilent 8760A K72 Performance Test Matrix

Budzar BTU Multi-Zone Electrically HeatedTemp

HP Agilent 8591E 

HP / Agilent 81685A 

HP 8146A opt 003 

Tektronix GB1400

LeCroy DDA-120 1.0 GHz

HP/Agilent 89431A 

Pelco Model 3 Sputter Coater

Despatch LBB2-12-1

Tektronix A6909 

Solartron 1254 Frequency Response Analyzer 

HP 11729C Carrier Noise Test Set

HP 8643A 

Spellman RHSR15PN60 High Voltage Power Supply

Giga-tronics 6082A opt 130 Synth Sig Gen 

Spellman RHR30PM60

Knight Tool Co. KTC-FT-54 

Molecular Devices Cytosensor Microphysiometer

Toddco General Inc CH200 

Gramatech GVS3100R 

Micro-Quad 8000 

Lydall Affinity RAA-002H-BB06C-BD3 

Tektronix VM700A opt's 

Unadyn UDC-55 Mini Dryer with 300 Modular Hopper

Advanced Energy MDX Magnetron Drive 2172

GCI DE1AC Air Conensing Chiller

EG&G 1461 Detector Interface

Tensile Testers, Inc JDH Tensile Strength Tester

Schaffner NSG 431 Electrostatic Discharge System

Jouan CR 412 Refrigerated Centrifuge

Seven Associates B-1A Induction Heating Unit

Gorman Bobbineer Wire Winding Machine

Advanced Energy PDW 600 

Instrument Systems RPA2000 

Teledyne Taber V-5 150-B Electric Stiffness Tester

Watson PS2-CB-2 Dual Position Payoff

Tektronix 1502B 

NoiseCom UFX 7907 Prog. Noise Generator

Vestil 4853 / Scale Hydrolic Scissor Lift

Beckman Multimek 96 Automated Pipettor

Wavetek 21117 

Labline 4628 

Danly 2 Ton Air Press

Appleton AH360-188

Clinton STB-10G 

K&E Vectron Transit Theodolite

Blue M POM7-206C-2X 

Solartron 7151

DRANETZ PP1-R

Lydall Affinity RAA-002H-BB06C-CBS Chiller

Tektronix VM700 Video Test Set 

Vickers Hydraulic Power Unit, 10 Gal Per Minute

Analogic / Data Precision 3001 AC Power Source

Microautomation M-150 Mounting Station

HP 70842B Error Detector Module w/ Opt H50 

HP Agilent 3709B Constellation Analyzer

Lot of 240 CITI PLUS II 

HP 85027A Directional Bridge

Systron Donner 6530 Microwave Frequency Counter

Noisecom UFX-BER 892 / 1850 Precision C/N Generator

Wavetek 4600 Autocal Amp 

Valhalla 2301 Power Analyzer, 2 Available

ESI 231C

HP/Agilent 89411A Network Analyzer Downconverter

Tektronix CTS 710 w/ Opts 004 / 022 

Tektronix AVG1 Multiformat Analog Test Signal Generator

Anritsu MG3670B Modulation Signal Generator w/ opt's

Noise/Com Model UFX-BER 892/1850 Precision CN Generator

Agilent J1421A SpectralBER Clock Source

Hankison HPRP0.75CU Compressed Air Dryer

HP 70621A 2.9 GHz Preamplifier Module 

HP 8757A Scalar Network Analyzer

DLS Test Works DLS400 ADSL Wireline Simulator

Ebara / Varian 323-0014 Cryocompressor 2.1

ENI ACG-3 RF Power Generator

HP/Agilent 5508A Laser Measurement Display

Tektronix 80C02 Optical Sampling Module

LeCroy LC574A 1 FGz DSO

HP 4191A 

NHI NHI-2040MW-10L 

Beckman L5B-CT Ultracentrifuge with Rotor 

HP 5183T Precision Digitizing Oscilloscope

HP Agilent 53310A Communication Analyzer

Anelva PRF-153B

Rapid-Air R34F

Mystaire 2450 Ductless Fume Enclosure

HP 3585A Spectrum Analyzer

Lindberg / Blue M Thermo GO1330A-1 Gravity Oven

Ruska DDR 6000

HP 83470A K71 Lightwave Reference Transmitter

Weinschel 8310 Series 6268 

Tek-Temp NRH450 Recirculating Heater with Options

Captair Filtair XL 9156 Ductless Fume Cabinet

EXFO FTB-300 w/opt's D2/M1/W1/N4 

Marconi 2305

Graphtec DMS1000 Data Management System

Vestil EHLTX-4855-1-39 

Fargo HDP720 High-Definition Card Printer

HP Agilent 8590B 

Quadtech 1870 AC DC Dielectric Analyzer

Tektronix TDS520B 500 MHz Oscilloscope

Watson PS2-CB-1 

Watson KRPS2-CB-1 

MetOne A2408-1-115-1 

Perkin Elmer Series 410

Perkin Elmer Sigma 10 Chromatography Data Station

Continental CMA-202R