電機運行電磁噪音增加。變頻器輸出的是矩形波電壓，存在高頻分量，因此電機會產生刺耳的高頻噪音，該噪音明顯大于風機的噪音，給噪音測量帶來了難題。

廈門岳航計算機工程有限公司

聯系人：李素云

企業QQ：2851195446，2851195466

手機：18965423501

座機：0592-5165501

(3)電機溫升升高。變頻器輸出電壓波形不是正弦波，而是畸形波，在額定扭矩下的電機電流比工頻時要多出約10%左右，所以溫升比工頻時略有提高(低次電流諧波使銅損增大，高次諧波使鐵損增大)，給電機溫升試驗帶來不便，使得溫升試驗結果偏差較大。

(4)普通電磁、數字測試儀表失靈。變頻器的輸入電流和輸出電流中都有頻率較高的高次諧波成分，高次諧波電流所產生的電磁場具有輻射能力，使其他設備(尤其是通信設備)因接收到電磁波信號而受到干擾，使得電磁式儀表、數字式儀表都不能用來直接測量交流電壓和電流，必須采用整流式儀表才能進行較為準確的測量。

變頻器是可以改變頻率和電壓的電源。變頻器是由交流-直流-交流(調制波)等電路構成的，將電網三相交流電經過三相橋式整流成脈動直流，再通過電解電容和電感濾波成平滑直流，*后通過逆變器，逆變成電壓和頻率可調的三相交流電。變頻器標準叫法為變頻調速器。

變頻器的輸入電路是三相交流電源經全波整流后向濾波電容器充電的電路，輸入電流總是出現在電壓的振幅值附近，呈不連續的沖擊波形式，如圖2所示，變頻器的輸出電路是把直流變成頻率連續可調的三相調制交流電壓的逆變橋電路，其輸出電壓波形是正弦調制spwm波，如圖3所示。

Olympus HMTV-1 X1.5 C-Mount Lens

Justrite 10208 Plunger Can, 2 QT CAP(US) / 1.9 Liters

Honeywell CR71B1054 Four Stage Chiller, 120V, 60Hz

Melles Griot 59 LGF 412-S Lens

Melles Griot 59 LGF 412-L Lens

New Box of 6 CART-GAC20-IND-SHR 155111-03 Granular Activated Carbon Filter

Olympus H100-012-090 HMTV-1 Probe

Mitutoyo 378-801 M Plan Apo 2 Lens (for parts)

Olympus PE 3.3X 125 Microscope Photo Eyepiece 27mm x 51mm Overall

Flanders Pureform 0-007-F-02-03 HEPA Filter 1000CFM 24" x 24" x 11.75"Thick

Combustion Engineering Fulscope ER/C Circular Chart Recorder 120/240V 50/60Hz

Electrothermal CM1000C Heating Mantle 110/120V 50/60Hz, 300W, 450C Max

R&D BOX OVEN 36" x 36" x 22.5" 120V

JPSA Mask Mount Block Adjustable 2-Axis 6.5mm Range 1 3/4" Aperture

JPSA A00014-MIC Focus Lens Mount 3-Axis Control 1 1/2" Aperture Diameter

JPSA A00560 Homogenizer Lens in Mount 1/2" x 1" 2" ID Mount

Opto Sigma 014-1400 Fused Silica liano Convex Lens with Mount 500mm Focal Length

JPSA UVM-2-.375-248HR45 Turning Mirror 90° 2-Axis Adjustable 1 3/4" Diameter

SPX / Blue M Oven Door 29 3/4" x 42 3/4" x 4 1/2" Thick 3 Latch 1 Handle 3 Hinge

Vented Enclosure Attached to Workbench 41" x 28" x 16 3/4" Enclosure 3/4" Thick

Parker LT10V Single Filter Cartridge Vessel 3" Inner Diameter 10" Depth 3/4" NPT

Filter Housing 3" Inner Diameter, 10" Depth 3/4" NPT Outlet/Inlet w/Metal Filter

Filter Housing 5-1/4" Inner Diameter, 10-1/4" Depth, 1" NPT Outlet/Inlet

Filter Housing 3" Inner Diameter, 9" Depth, 1/2" NPT Outlet/Inlet

Filter Housing 3-1/2" Inner Diameter, 9" Depth, 3/4" NPT Outlet/Inlet

Associated Environmental Systems SD601SLC Environmental Chamber w/AES 86648

Winthrop Pharmaceuticals 712214 Contrast Media Warmer *For Parts, Not Working*

Drucker 853VES Fisher Heal Horizon Plasmafuge-12 *For Parts, Not Working*

Lab-Line 4682 Digital Reciprocating Water Bath Shaker, 120VAC, 11.66A, 1400W

Neslab Shandon Histobath 2 Low Temperature Freezing Bath *Parts Only*330106-05-30-05-02-00

330106-05-30-10-02-05

330130-040-00-00

330130-040-01-00

330130-045-00-00

9563-810

9853-610

DSAI110 57120001-DP

M3575R-H33BF

M68CPU CPU

MC-4/11/01/400

S-D4006-D

S-D4006-D S-D4006

S-D4008-A S-D4008

SM 25/50-TCT DC 560V 25A 06231-103

SR 469 469-P5-HI-A20

1336F-BRF200-AN-EN

1336F-BRF200-AN-EN

BS206 BIO420 BIO420/00

BS204 BIO246 BIO246/00

BS205 BIO413 BIO413/00

1336-BDB-SP6A

Olympus Training Adapter for Microscopes (no eyepieces)

Techniquip TLC-5 Fluorescent Ring Light 120V

Nikon 10x/21 10x Microscope Eyepiece (light scratches on lens)

Nikon 10x/21 10x Microscope Eyepiece

Aerotech A0M105-2 Gimbal Optical Mount for 2" Dielectric Lens

Aerotech A0M105-2 Gimbal Optical Mount with 2" Dielectric Lens

NIB Cleanline M3636-6B Blue Cleanroom Mats 36" x 36" 6 Packs of 40 240 Total

WF20X/10 Microscope Eyepiece 20x Widefield