A06B-0512-B003現貨 in stock! 歡迎來電咨詢~！！

A06B-0512-B003,

A06B-0512-B003

杜塞爾多夫/上海，2019年9月24日——中國正在引領電動汽車領域的潮流。世界上沒有任何一個地方有這么多正在行駛的電動汽車和電動汽車制造商。9月23日至25日在上海舉行的第8屆國際CTI論壇上，這一話題也成為了重要議題。此次CTI論壇的主題是“汽車動力系統，智能化，電動化”。600名汽車行業的專家將以傳動技術為主題，通過8個平行會議的71個專業報告對其最新的發展趨勢展開討論。
電動汽車不斷發展

國際CTI論壇顧問委員會、德國布倫瑞克工業大學教授 (Technischen Universitt Braunschweig)Ferit Küükay博士說：“根據相關法律規定，待產新能源汽車（NEV）的份額從2018年的8%增加到2019年的10%，到2020年將達到12%。”他認為這是中國電動汽車行業的決定性驅動力。出席此次CTI論壇并發表演講的中國主要汽車制造商也在著力推動新能源汽車的發展。來自SEAT科技有限公司上汽科技中心EDS部門的總監王健稱，中國最大的汽車集團上汽集團于今年年初在寧德開設了新的汽車工廠，專門生產其自主品牌榮威和名爵的電動汽車。吉利汽車研究院電子驅動系統副總監阮鷗女士介紹，吉利正在努力降低電動汽車的成本。東風汽車公司希望借助其綠色2022計劃將電動汽車的份額提高到30%。對于如何做到這一點，東風汽車動力總成發展部總監張社民博士在CTI論壇的全會中做出了解答。
人工智能，固態電池和其他發展趨勢

在CTI論壇上除了主要議題電動汽車外，專家們還討論了行業內的其他發展。人工智能如何讓汽車更智能？中興通訊Unlimited AI總經理田鋒向與會者們闡釋了現今人工智能在汽車中的應用以及未來我們可以期待的功能。另一個熱門話題是固態電池。雖然鋰離子電池目前仍被認為是首選的解決方案，但專家認為這只是一種過渡技術，最終將被固態電池所取代。清陶（昆山）能源發展有限公司總經理李崢博士描繪了未來的前景并揭示了為什么憑借這項新技術每次行程范圍可以達到800公里。有關潤滑油的話題目前也受到了更多關注。英國石油嘉實多公司OEM技術副總裁兼杰出顧問David Hall博士展示了嘉實多2019年的能源展望和先進的移動解決方案。此外，來自道達爾，殼牌，大慶勞特和雅富頓的專家們還在單獨的會議中對現代輕質機油如何在保護發動機的同時幫助減少排放進行了討論。
中國CTI論壇——汽車行業的專家盛會

CTI論壇現已在中國舉辦了八次。CTI論壇歐洲，美國和中國常務董事Sylvia Zenzinger對此次大會作出了積極的評價：“今年的CTI論壇再次迎來了來自15個國家的600余名與會者。毫無疑問，除了德國和美國之外，此次盛會也在中國汽車行業的專家們心中留下了深刻印象。過去幾天的會議氣氛非常熱烈，我們已經開始期待第九屆CTI論壇再次在中國召開。”

上億庫存，國內外近千個倉庫，公司部分產品型號如下，歡迎聯系哦~！

1738-IE4CM12 ArmorPoint 4 Point Input Module

1769-CJC CompactLogix CJC Temperature Sensor

193-EPD E1 Plus Panel Mount Adaptor

194L-A16-1755 16 A 194L Load Switch

2090-CPBM7DF-04AA50 MP-Series 50 m Length Cable

2090-XXTPMP-16S60 MP-Series 60 m Length Power Cable

GC646MBPS99 Proficy GlobalCare Complete for ME Professional Development Suite - Site License

GFK-1868 CIMPLICITY Machine Edition Getting Started

IC200ALG240 Analog input 16 bit voltage/current 8 isolated channels

IC646DUR001 Durus Controller Programming and Simulation Software

IC647IFPLSR00300K iFIX Plus SCADA 300 I/O Server (M1 Kit Part)

IC660MLD023 Label for IC660BBD023 (Qty 100)

IC697BEM713RR Bus Transmitter (Also Provides Parallel Programming Port)

IC800ABK002 Built-In lithium encoder battery kit for Alpha HVi amplifiers (except Alpha SVM1-180HVi)

FlexLogix System 1756-BA1 LOGIX5000 BATTERY ASSEMBLY

GuardPLC Systems D1755-RM001BENP GUARDPLC CONTROLLER SYSTEMS SAFETY REF MANUAL

Process Control 1757-UPGSR100 UPGRADE 100 PT RED SERVER

Operator Interface 2711P-B15C4B1 PV PLUS 1500, KEY/TOUCH, ENET, AC PS, STD MEM

Support 9230-IOLINXSDKS SUPT RENEWAL CONTRACT FOR 9230IOLINXSDK

Support 6300-MSR 6300-MS SOFTWARE SUPPORT REINSTATEMENT

Support F1785-V80BSERE FIRMWARE UPGRADE FOR 1785-V80B PLC5 PROCESSOR MODU

RSI Software Products 9301-2SE2350PTU3 RSVIEW32 WORKS 1500-5K UPGRADE IN-SUPT (PT)

RSI Software Products 9701-VWSTPU2 RSVIEW STUDIO TO RSVIEW STUDIO WITH PE

RSI Software Products 9399-WABUG WINTELLIGENT LINX FOR A-B PROG. CONTROL USER GUIDE

Motion Control 8720MC-LR03-032B 3%,32AMP,460VAC LINE REACTOR

BC646MRC700 Logic PC & View Runtime 700 I/O

IC300RCS075 14 DC Inputs (12/24vdc), 10 Relay Outputs (2.5A per point). Built-in network interface for CsCAN or DeviceNet slave.

IC754VBI06STD 6" Color-STN QuickPanel View, Intermediate, Touch, 24VDC, Blank Label

MTR-3T55-H-R-0-M-0 MTR series metric servo motor with resolver

20AC8P7C0AYNANC0 PowerFlex 70 AC Drive 8.7 A at 4 kW 20A

20DC030A0EYNANASE PowerFlex 700S AC Drive 20D

20G1ANC170AN0NNNNN PowerFlex 755 AC Packaged Drive

25B-E032N104 PowerFlex 525 22kW (30Hp) AC Drive

2715-T9WA PanelView 5500 9 in. Graphic Terminal

FR-A740-55K 84KVA 110A 55KW

1492-LG16 IEC Term Blck 12.1x82.5x43.5mm Spr Clp

1494F-N21 Auxiliary Door Interlock Kit

軟啟動器 3RW44356BC36

ET 200SP 6ES7131-6BF00-0CA0 DI 8x24VDC 高性能型，基座單元類型 A0

1585D-E4UB-10 1585D Ethernet Media Cordset

1753-IB16XOB8 GuardPLC Digital Combo Module

1794-IB16XT Flex XT 16 Point Digital Input Module

194E-AA32E 194E Load switch

2080-LC20-20QWBR Micro820 20 I/O ENet/IP Controller (RTB)

2090-CSWM1DF-14AA32 Kinetix Cable Single DSL 2090-Series

20AC3P5A0AYYANC0 PowerFlex 70 AC Drive 20A

GC646MPS001 Proficy GlobalCare Complete for Logic Developer - PLC Standard

HE693PBS105 Profibus DP slave module for Series 90-30.

IC610CHS111RR U.L. Listed Rack, 115Vac Power Supply (5 Slots)

IC647HSTSC3KM Server to Server Collector for Historian - Standard Server 2500 Points (M4 Key)

IC660BBA105 Block 115Vac/125Vdc Analog Current Source 6 Outputs

IC694MDL930 Output module, relay 4 amp, 8 point isolated per point.

IC756WDJ009K-99 DV Development Sys VB and Java, Korean, Version 9.9

MicroLogix 1500/1769 System D1762-RM001CENP MICROLOGIX 1200&1500 INSTR.SET REFERENCE MAN.

PLC-5/1771 System 1771-P4RK CONFORMALLY COATED, POWER SUPPLY, REDUNDANT, SLOT

Distributed I/O 1794-CJC2 COLD JUNCTION COMPENSATION KIT (2 PIECES)

Operator Interface 2711P-B6M1A PV PLUS 600 GRAYSCALE, KEY/TOUCH, SRIO, AC PS

Support 9323-PA2FS SUPT RENEWAL CONTRACT FOR 9323PA2F

Support 9358-MTRCK03R SUPT REINSTATEMENT CONTRACT FOR 9358MTRCK03ENE

Support F1772-LZPSERA FIRMWARE UPGRADE FOR 1772-LZP PLC2 PROCESSOR MODUL

RSI Software Products 9324-RLD600ITE RSLOGIX 5000 FULL EDITION, ITALIAN

RSI Software Products 9305-RSVADFCESE RSVIEW32 ACTIVE DISPLAY FLOATING CLIENT (SPANISH)

RSI Software Products 9358-SPCSEE SPC STANDARD EDITION

Motion Control 2094-ANCON-1 230V CONVERTER CONNECTORS UP TO 6KW

A06B-0147-B175#7076 A22/2000 Servo Motor, IP67 Sealing, Holding Brake, 64K Serial Encoder

IC200UDR002 14 point (8) 24VDC In, (6) Relay Out, 24VDC Power Supply

IC752CBT010 Mature, order QuickPanel instead. DataPanel 320T ME (Mono Expansion): 320x240 1/4 VGA Monochrome LCD with 80386SX/40 PC processor. Analog touch screen with text, bitmaps, bar graphs, real time clock. With 2M memory and PC/104 capability.

MTR-1N31-N-A-S-0RR Stepping Motor Nema34

ZA06B-0116-B075#0008 BM1/4000 servo motor with 32k serial encoder

20BD481A0ANNNNC0 PowerFlex 700 AC Drive 20B

20G11TF330JN0NNNNN PowerFlex 755 AC Packaged Drive

25-PM1-D013 PowerFlex 520 5.5kW (7.5Hp) Power Module

372SPU47431V26 Quantum Concept 軟件,XL 版本,多用戶,V2.6

FRN 1.5E1S-7C 3.0 KVA 8.0A 1.5KW 單相AC220V/50Hz/60Hz

K8AB-PH1 三相相序及缺相保護200-500VAC

1492-SPM3D010 MCB Supplementary Protector 1 A

軟啟動器 3RW40282TB05

輸入仿真器 6ES7 274-1XK30-0XA0 模擬器

150-SD1NBR SMC-50 SOLID STATE MOTOR CONTROLLER 361A

1738-8CFGM12 ArmorPoint 8 Point Combination Module

1783-US5T Stratix 2000 5 port unmanaged switch

193-EXP-CBL-1M E300/E200 1 Meter Expansion Bus Cable

20-750-MNT3-F8 PF755 FR8,IP00,FLOOR MOUNTING KIT

2090-CPWM7DF-16AF01 MP-Series 1 m Length Power Cable

20AB-DB1-B PowerFlex 70 Resistor Kit

GA647IFESGRN00300 GCA iFIX Optn: ESig & ERec 300 I/O Run

GP-3102NTSB GagePort Combo NT 2-port input - Sales BOM.

IC600BF800RR Local I/O Receiver Module

IC647HSTCC15KM Calculation Collector for Historian - Standard Server 15000 Points (M4 Key)

IC647TAR000 CIMPLICITY Advanced Viewer Runtime Only - No Development

IC693MDL752RR 5/12 Vdc (TTL) Output, Negative Logic, (32 points), requires (2) CBL3

IC756LDV000J-99 DV Development - Intel/Linux RedHat Op Sys, Japanese, Version 9.9

Pico Controllers 1760-CBL-PM02 PROGRAMMMING CABLE FOR PICO CONTROLLER

PLC-5/1771 System 1771-OD 120V AC ISOLATED OUTPUT MODULE, 6 OUTPUTS

Distributed I/O 1791R-RIOSCON RIO 6 PSITION CONNECTOR, LOCK SCREWS (LOT OF 5)

Communications 1786-RG6 CONTROLNET RG6 QUAD SHIELD COAX CABLE

Operator Interface 2706-PENETM ETHERNET/IP COMMUNICATION MODULE FOR 2706-P4X

Support 9701-VWSCRAS SUPT RENEWAL CONTRACT FOR 9701VWSCRAENE

Support 9324-RL0100ENR SUPT REINSTATEMENT CONTRACT FOR 9324RL0100EN

EtherNet/IP Products 2711P-K12C4D1 PV PLUS 1250, KEYPAD, RIO/DH, DC PS, STD MEM

RSI Software Products 9301-2SE340KOU3R RSVIEW32 RUNTIME 150-32K UPGRADE OUT-SUPT (KO)

RSI Software Products 9356-PRO2350U5R UPGRADE: OUT-SUPT: RSSQL PROF.150 TO PROF.5000 TAG

Motion Control F-4050-Q-H00AA BRUSHLESS MOTOR/ENCODER

4360 PANEL METER. 4 1/2 DIGIT, UNIVERSAL INPUT AND POWER

IC200ACC301 I/O FILLER MODULE

IC693CSE331 Series 90-30 Modular State Logic CPU 331

TGT-DI0L-32-0 Target Digital I/O 16 Inputs/Outputs

VDNC-SH8 External Ethernet 8 Port Serial Hub

20BD014A3AYNAND0 PowerFlex 700 AC Drive 14 A at 10 Hp 20B

20G11BF1K4JN0NNNNN PowerFlex 755 AC Packaged Drive

22C-B090A103 PowerFlex 400- 22 kW (30 HP) AC Drive

140XCA71703 Quantum 背板擴展電纜, 1M

285-BRC24-M3D Source Brake Patchcord Cable, 3M, M24

H7ET-N 7位液晶顯示累積計時器,觸點輸入、外部/手動復位、量程999999.9h-3999d23.9h可切換

1492-SPM1D080-N MCB Supplementary Protector 8 A

通用型變頻器 6SE6 440-2UD23-0BA1 3.0 KW,149 x 202 x 172

電機啟動器 3VU13403NJ00

150-C43NBD SMC-3 43A Smart Motor Controller

1609-PXBP 1609 External Battery Pack UPS Accessory

1771-DBMEM2 1771 Memory Module

193-EC2DE E3 Plus 9-45 A Overload Relay

198-MS22 ModCenter IEC Push-Button

2090-CPBM7E7-16AF09 MP-Series 9m Length Pwr and Brake Cable

2094-AL50S Kinetix Line Interface Module

CQPKSTDN0000 6 inch Color STN/ TCP Label/ No Ethernet/ CF/ 24VDC/ UL/ cUL/ CE/ UL1604

GFK-0466 Logicmaster 90 Series 90-30/20/Micro Programming S/W User's Man.

IC200UEX626-24 Qty of 24, 6 channel Analog expansion. (4) Analog inputs & (2) Analog Outputs, 24VDC Power Supply (includes IC200CBL501)

IC647APS001 PA Production Server

IC647PFL100 Proficy Process Systems Standard Edition 1000 I/O with iFIX

IC693CHS398 Base, Expansion, 5 Slots

IC754PIF001 90-30 I/O INTERFACE FOR QP CONTROL

KIT-PACPROD Kit-PACPROD includes one each of the following,(GE Fanuc will ship the items below in bulk and not in shrink wrap packaging) GFS-557 PAC Productivity Workshop Presentation handouts; GFA-406 Controller <(>&<)> I/O; Solutions Product Catalog GFS-384 PA

SLC/1746 System D1747-UM010BENP BACKUP SCANNET USER MANUAL

Distributed I/O 1734D-IB8XOB8E 24 VDC 8 SINK IN 8 SOURCE OUT, DNET COMMS, SCREW

Application-specific products 1803-EEM01E12 EEM, 8 ANALOG, 4 TO 20 MA, NEMA 12 ENCLOSURE

Operator Interface 2711-T10G10 PV1000 GRAYSCALE TOUCH, DNET & RS232 PRINT

Support 9301-2SE3500ITS SUPT RENEWAL CONTRACT FOR 93012SE3500IT

Support 9381-PA5KENR SUPT REINSTATEMENT CONTRACT FOR 9381PA5KEN

DeviceNet Products 1790D-4R0 DNET LDX, 4 INPUT RTD BSE,D-SHELL CONN

RSI Software Products 9301-2SE330FRU1R RSVIEW32 RUNTIME 300-1500 UPGRADE OUT-SUPT (FR)

RSI Software Products 9358-PBEPB03ENE RSBIZWARE BATCH & EPROCEDURE BNDLE PLX 03 UNITS

Motion Control MPL-B580J-MK24AA MOTOR,SERVO,34.0NM,3800RPM,MULTI,460V,BRK,32MMSHAF

Motion Control 2090-UXLF-HV323 AC LINE FILTER,ULTRA,23 AMPS, 460V, 3 PHASE

GQSI31200S2P QUICKSTART KIT 10.5" STN GE LABEL

IC646NHR000 Server Redundancy

MTR-3T66-H-R-B-M-0 MTR-Series Servo Motor, Resolver, Metric, 24V Brake

ST-1904 STXi input module 4 points, 220V AC (AC 170V ~ 264V)

20BC085A0AYNANA0 PowerFlex 700 AC Drive 85 A 45 kW 20B

20F11RD2P1AA0NNNNN PowerFlex 753 AC Packaged Drive

22A-A3P6N113 PowerFlex 4- 0.75 kW (1 HP) AC Drive

140SHS94500 Quantum 熱備功能可裝載軟件

284-MTRS22-M10 ArmorConnect Shielded Motor Cable

C200H-TC003 溫度控制,熱電偶輸入2路,電流輸出

1492-RCDA4B63 Residual Current Device 63 A

同步光纜 6ES7960-1AA04-5KA0 同步光纜 10m

變送器 3RS10 42-2GD70

1497-H-CXSX-0-N Control Circuit Transformer

1606-XLE240E Power Supply XLE 240 W Power Supply

1762-RPLRTB40 MicroLogix 40 Point Replacement TB

188-K3D130-N Miniature Circuit Breaker 13 A

194L-HE4A-250 194L Control and Load Switch Actuator

2090-CPBM7DF-08AA09 MP-Series 9m Power and Brake Cable

2090-XXNPMF-14S12 Kinetix Drives 12m Standard Cable

BC647TPR935 "CIMPLICITY HMI ProServer 35,000 I/O Runtime System with Proficy GlobalCare"

GC647PSC025 Global Care for Proficy Process Systems 250 I/O with CIMPLICITY

IC200MDL750CA Conformal Coated Output 12/24VDC POS LOGIC 0.5A per point (2 groups of 16) 32 points

IC646PME001 Proficy Change Management for ME 1 User

IC647MTLC MTL:Mettler Weighing Terminals

IC684TROLI603 CIMPLICITY HMI Plant Edition Online Course -Module 3

IC697VAL304 Discontinued future replacement with Embedded VME-6550. Contact GE IP Embedded for details.

IC800SSI228RP2RR 28A, 230V, Profibus S2K Servo Controller for MTR Series Motors

SLC/1746 System 1747-L553 SLC 5/05 CONTROLLER

Industrial Computers 6181P-12TP2KHDC VERSAVIEW INTEGRATED DISPLAY COMPUTER 12-INCH

Application-specific products 9358-PBBK10ENE RSBIZWARE BATCH FOR PLX BACK-UP KEY 10 UNITS

Operator Interface 2711-K5A10L3 PV550 MONOCHROME KEY, DNET & RS232 PRINT

Support 9306-4EXP02R SUPT REINSTATEMENT CONTRACT FOR 93064EXP02ENE

Support 9393-RSTCLXS SUPT RENEWAL CONTRACT FOR 9393RSTCLX, 9393RSTPCLX

ControlNet Products 2711-K10G15L1 PV1000 GRAYSCALE KEY, CNET & RS232 PRINT

RSI Software Products 9301-2SE2500PTU5 RSVIEW32 WORKS 5K-100K UPGRADE IN-SUPT (PT)

RSI Software Products 9358-BEPB30U1R UPGRADE: OUT-SUPT: RSBW BATCH & EPROCEDURE 03 TO30

Motion Control MPL-A4540C-SK22AA SOTOR,SERVO,10.2NM,1500RPM,SINGL,230V,9.5KG

Motion Control 2090-XXNFY-S03 CABLE,NON-FLEX,MOTOR FEEDBACK,Y,3M

CF3A-2MPB-0140-AZ Encoder Feedback Cable, Alpha 3 & Larger Motors, 14 Meters

IC641PCC126 Logic Engine (runtime) w/o GUI - Unlimited Points

IC800SSD228S1 28 Amp S2K Series Servo Amplifier, 230 VAC

PR-PAT-HS01 Proficy PAT - Driver For Ethernet-Coupled Hamilton Sundstrand Analect Ftir Spectrometers

20BB-DB2-1 PowerFlex 700 Resistor Kit

20DD820ACENNBEASE PowerFlex 700S AC Drive 820 A 700 Hp 20D

20YF1K0N0ANNANA0 PF 700AFE,FR13,690 VAC,1030 A,IP00,W/LCL

2711P-K10C4A8 PanelView Plus Terminal

280-PWRM35C-M35 ArmorConnect 3-PH Power Media trnk cable

CPM2A-20CDR-D 20點主機 DC24V 12點入8點繼電器輸出 自帶RS232C口

1492-MS5X12V21-30 Connection Products

1495-N63 Protective Fuse Cover

行程開關 3SE53120SE13

運行版軟件 6AV2105-0BA14-0AA0 SIMATIC WinCC Runtime 專業版 128 PowerTags ASIA V14

1585J-M4TBJM-70 RJ45 Ethernet Media

1756-OF8K ControlLogix 8 Point Analog Output

188-K1C080-N Miniature Circuit Breaker 8 A

194E-HE8A-175 IEC Load Sw Actuator Type A Gray/Black

2090-CFBM7DF-CEAA15 MP-Series 15m Servo Feedback Cable

2090-UXLF-136 Ultra Series 36A AC Line Filter

BC646PEW120 OP EWS Development Software 300 I/O w/GC

GC647IFCLNTS001 GCC iFIX iClientTS Each Additional User

IC200ALG320LT ANALOG OUTPUT 12 BIT CURRENT 4CH (LT)

IC646IFCLNTCRO100C iFIX iClient Read Only 100 PK Keyless (M1Component Part)

IC647IFPRDV00300C iFIX Profsnl SCADA 300 I/O Development (M1Component Part)

IC660SLA024 Red Safety Label Kit for IC660BBA024 Genius Blocks

IC697CBL700 Cable Kit, Power Supply Exp. (Used for 2-Rack P/S Function)

IC800BPK020 BSVU-20 20 amp Beta series amplifier kit

ControlLogix/1756 System 1756-L63 LOGIX5563 PROCESSOR WITH 8MBYTE MEMORY

Industrial Computers 6182H-7BRH6D VVCE 700, KEY/TOUCH, STD MEM, RIO/DH, DC

Process Control 9358-PB60ENE RSBIZWARE BATCH FOR PROCESSLOGIX 60 UNITS

Operator Interface 2711P-K15C4D1 PV PLUS 1500, KEYPAD, ENET, DC PS, STD MEM

Support 9352-WABGWS SUPT RENEWAL CONTRACT FOR 9352WABGW

Support 9308-RSFBENU3 UPGRADE RSFIELDBUS CONFIG SW 256 TO 1024 FB

Support F5250-LP4 FIRMWARE UPGRADE FOR 5250-LP4 PLC5250 PROCESSOR MO

RSI Software Products 9301-2SE2353FRE RSVIEW32 WORKS 5K WITH RSLINX (FRENCH)

RSI Software Products 9351-VSRT INTERCHANGE FOR OPEN VMS RUNTIME

RSI Software Products 9399-WINIGPT INSTAL'ION GUIDE FOR WINDOWS-BASED PROD(PORTUGUESE

Motion Control 2090-CDNPBMP-8S15 CABLE,460V,NON-FLEX,MOTOR POWER,MP,8 GAUGE,15M

BC646MSP005 Logic Developer - State Professional w/1 Yr of SAFE 5 Pack

IC300TIU111 Operator Control Station, Two serial ports, (1) RS-232 and (1) RS-485/RS-232, (1) CAN port with keypad. No SmartStack or Control Support.

IC754VSI06STD 6" Color-STN QuickPanel View Intermediate, Touch, 24VDC

MTR-3T66-H-R-B-M-0 MTR series metric servo motor with resolver and brake

20AD011A3AYNACG0 PowerFlex 70 AC Drive 11 A at 7.5 Hp 20A

20DC043A0EYNANANE PowerFlex 700S AC Drive 20D

20G1ANC302JN0NNNNN PowerFlex 755 AC Packaged Drive

25C-A4P8N104 PowerFlex 527 0.75kW (1Hp) AC Drive

280-M35M-M3 Field Receptacle, Male, M35, 3M

FR-F740-55K 80.8KVA 106A 55KW 3相AC380V/50Hz/60Hz