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HP 8511A Test Set Operating and Service Manual

General Information

Miscellaneous

Miscellaneous

Adjustments

The HP 8511A has no adjustments. Specifically, no attempt should be made
to adjust the samplers.

Replacement Parts

The replaceable parts are listed in Chapter 6, “Service and Replaceable
Parts” of this manual.

Summary of Contents for 8511A

Page 1: ...upport your product This manual provides the best information we could find It may be incomplete or contain dated information and the scan quality may not be ideal If we find a better copy in the future we will add it to the Agilent website Support for Your Product Agilent no longer sells or supports this product You will find any other available product information on the Agilent Test Measurement...

Page 2: ...HP 8511A Frequency Converter Test Set Operating and Service Manual HP part number 08511 90072 Printed in USA 23 September 1999 Revision 1 0 ...

Page 3: ...is not furnished by Hewlett Packard This document contains proprietary information which is protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated to another language without prior written consent of Hewlett Packard Company Restricted Rights Legend Use duplication or disclosure by the U S Government is subject to restrictions as set fort...

Page 4: ...and accessory information Chapter 2 Specifications and definitions Chapter 3 Installation environmental and preparation information Chapter 4 Information on the operation of this test set Chapter 5 How to do performance tests and other performance information Chapter 6 Servicing and replaceable parts information ...

Page 5: ...rformed at Buyer s facility only upon HP s prior agreement and Buyer shall pay HP s round trip travel expenses In all other areas products must be returned to a service facility designated by HP For products returned to HP for warranty service Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duti...

Page 6: ...UENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For assistance call your local Hewlett Packard Sales and Service Office refer to Service and Support on page viii ...

Page 7: ...d 5150 Spectrum Way Mississauga Ontario L4W 5G1 905 206 4725 Europe Hewlett Packard European Marketing Centre Postbox 999 1180 AZ Amstelveen The Netherlands 31 20 547 9900 Japan Hewlett Packard Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 Japan 81 426 56 7832 81 426 56 7840 FAX Latin America Hewlett Packard Latin American Region Headquarters 5200 Blue Lagoon Drive 9th ...

Page 8: ...age to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met Instrument Markings When you see this symbol on your instrument you should refer to the instrument s instruction manual for important information This symbol indicates hazardous voltages The laser radiation symbol is marked on products that have a laser ou...

Page 9: ...pplied power cord set Whenever it is likely that the protection has been impaired the product must be made inoperative and secured against any unintended operation Before Applying Power Verify that the product is configured to match the available main power source as described in the input power configuration instructions in this manual If this product is to be powered by autotransformer make sure...

Page 10: ...HP 8511A Test Set Operating and Service Manual xi ...

Page 11: ...eyboard Press Return Softkey Used for simulated keys that appear on an instrument display Press Prior Menu User Entry Used to indicate text that you will enter using the computer keyboard text shown in this typeface must be typed exactly as printed Type LOAD PARMFILE Used for examples of programming code endif ifndef NO_CLASS Path Name Used for a subdirectory name or file path Edit the file usr lo...

Page 12: ...0 1 9 Option W31 1 9 Option 1BN 1 9 Option 1BP 1 9 Accessories 1 10 Accessories Supplied 1 10 Accessories Available 1 10 Cables 1 10 Operating and Safety Precautions 1 11 Electrostatic Discharge ESD 1 11 Service 1 11 Additional Equipment Required 1 11 Miscellaneous 1 12 Adjustments 1 12 Replacement Parts 1 12 2 Specifications Definitions 2 1 Table 2 1 HP 8510 HP 8511A Performance 2 1 Figure 2 1 Co...

Page 13: ...g Connectors 3 4 Power and Control Connections 3 4 Signal Path Connections 3 4 Figure 3 3 HP 8511A System Connections 3 5 Packaging 3 6 4 Operation Introduction 4 1 Front Panel Features 4 1 Figure 4 1 Front Panel Features 4 1 Figure 4 2 Rear Panel Features 4 2 Operators Check 4 3 Equipment 4 3 Table 4 1 Necessary Equipment 4 3 Procedure 4 3 Figure 4 3 Hardware Configuration for Operator s Check 4 ...

Page 14: ...le Parts 6 3 Replacement Procedures 6 6 Replacing the T1 Power Transformer 6 6 Procedure 6 6 Figure 6 1 Wire Connections to Line Module FL1 6 7 Replacing the B1 Fan 6 8 Procedure 6 8 Replacing the Frequency Converter 6 9 Procedure 6 9 Figure 6 2 HP 8511A Major Assemblies 6 10 Figure 6 3 HP 8511A Miscellaneous Mechanical Chassis and Electrical Parts 6 11 Table 6 2 HP 8511A Option 001 Replaceable Pa...

Page 15: ... iv HP 8511A Test Set Operating and Service Manual ...

Page 16: ...8510 measurement system The HP 8511A documentation is to be used with the HP 8510 documentation and may be inserted into the HP 8510 test accessories binder provided with your HP 8510 manual set The HP 8511A Operating portion consists of General Information Installation Operation Performance Tests The HP 8511A Service portion consists of Replaceable parts Service information ...

Page 17: ...lied Reference Designator HP Part Number Qty Description 1 08511 60024 2 HP 8511A B and Antenna Measurement System Performance Verification Software Assembly 2 08510 20006 1 Semi rigid cable 3 08510 20005 1 Semi rigid cable 4 08510 60102 1 Test set cable assembly 5 8120 1348 1 Power cord USA only 6 8120 3445 1 GPIB cable ...

Page 18: ...urn to Chapter 3 Installation of this manual To check the proper operation of the HP 8511A see Operators Check on page 4 3 of this manual To verify that the instrument meets its published specifications use the HP 8511A B and Antenna Measurement System Performance Verification Software HP part number 08511 60024 To troubleshoot the HP 8511A begin with the Service and Equipment Overview chapter of ...

Page 19: ...ccessories like couplers and power splitters The HP 8511A provides a convenient means of customizing a test configuration for a variety of applications within the frequency range of 45 MHz to 26 5 GHz In addition to configurations for measuring reflection and transmission parameters of one port or two port devices you can build configurations to characterize antenna parameters radar cross sections...

Page 20: ...HP 8511A Test Set Operating and Service Manual 1 5 General Information Description and Operating Characteristics Figure 1 2 Example of an HP 8511A Measurement Set up ...

Page 21: ...cription and Operating Characteristics Table 2 1 on page 2 1 lists the operating specifications and characteristics of the HP 8511A Note that the performance of the HP 8511A is verifiable only as part of an HP 8510 system Verification is performed at the ports of the HP 8511A ...

Page 22: ...and operate the software are as follows 100 IBM PC compatible computer Pentium 133 or better Windows 95 Windows 98 or Windows NT 4 0 installed GPIB interface card and cable or Hewlett Packard GPIB card and cable HP BASIC for Windows version 6 32 or later installed A CD ROM drive HP 8511A B and Antenna Measurement System Performance Verification Software Internet Explorer 43 0 or higher or Netscape...

Page 23: ...e option 001 test set to the HP 8510 IF switching is performed automatically by the option 001 test set without reconnections Option 908 Option 908 supplies the test set with the parts required to rack mount it with the handles removed Refer to Chapter 3 Installation of this manual for additional information Option 910 Provides a duplicate test set manual at the time of purchase Option 913 Option ...

Page 24: ... at the time of sale Instruments ordered with option W30 are identified on the serial number label or on a special identification label supplied with the instrument Option W31 Extended Service On Site Option W30 adds two additional years of on site repair coverage to follow the first year of warranty Option W31 can be ordered only at the time of sale Option 1BN Certificate of Calibration Option 1B...

Page 25: ...pplicable for any given system Please consult with your local HP Field Engineer for specific recommendations Additional information is included in the HP 8510 manual set and the HP 8510 data sheet Cables The choice of cables depends on the type of signal separation device s used and the system configuration A twenty foot long IF interconnect cable can be ordered using HP part number 08510 60103 Co...

Page 26: ... Service The voltages in this test set warrant normal caution for operator safety Service should be performed only by qualified personnel For more information on service strategy troubleshooting procedures replaceable parts and similar information refer to the HP 8510 On Site Service Manual Additional Equipment Required Table 2 6 on page 2 6 lists additional equipment and accessories required for ...

Page 27: ...ral Information Miscellaneous Miscellaneous Adjustments The HP 8511A has no adjustments Specifically no attempt should be made to adjust the samplers Replacement Parts The replaceable parts are listed in Chapter 6 Service and Replaceable Parts of this manual ...

Page 28: ...0 dBm 85 dBm Conversion Gain7 2 dB to 12 dB 1 These performance parameters are field verifiable using the supplied software and the performance tests documented in the HP 8511A B and Antenna Measurement System Performance Verification Software Installation and Getting Started Guide HP part number 5962 0493 2 Deviation from a least squares straight line fit excluding noise and slope Ratio measureme...

Page 29: ...113 dBm Accuracy Enhanced Crosstalk3 115 dB 115 dB 113 dB 1 The performance parameters listed are characteristic of the HP 8511A HP 8510 They are typical or nominal figures and are not field verifiable 2 Determined by 0 1 dB compression level and system low level noise Low level noise measured with 50 ohm load at port and 1024 averaging factor Noise floor varies with averaging factor 10 log averag...

Page 30: ...istics1 part 2 Tracking Drift typical Magnitude 0 001 x V C Linear Phase 0 1 f GHz x V C degrees Input Ports Connector type Impedance Damage level Port input power for phase lock female 3 5 mm 50 ohms nominal 13 dBm 20 mW CW RF input2 Frequency 0 045 to 8 GHz 8 to 20 GHz 20 to 26 5 GHz Minimum 40 dBm 38 dBm 35 dBm Maximum 5 dBm 5 dBm 5 dBm 1 The performance parameters listed are characteristic of ...

Page 31: ...wer Range1 Maximum Gain Error dB 10 to 34 dBm 0 34 to 46 dB 0 005 46 to 58 dB 0 010 58 to 70 dB 0 015 70 0 025 Detector Circularity Error 0 003 dB peak IF Residuals 140 dBm1 IF Linearity 0 003 dB Incremental Phase Accuracy Phase versus Phase at Measurement Reference 0 001 degrees degree not to exceed 0 02 degrees peak 1 Measured at the IF input to the HP 8510 not at the test set test ports Table 2...

Page 32: ...rmance Test procedures may be used for verification within the frequency limits of those sources When used with another recommended source the performance specifications may differ from those for the HP 8510 HP 8511A HP 8360 series configuration The performance test software will display and print the limits for the chosen configuration Performance verification temperature 23 3 C RF source power l...

Page 33: ... Meter HP 436 Option 022 HP 437 HP 438 HP E4418 HP E4419 Power sensor dc to 26 5 GHz APC 3 5 HP 8485A Power splitter dc to 26 5 GHz APC 3 5 HP 11667B 5086 7408 Female to female adapter dc to 26 5 GHz APC 3 5 1250 1749 Male to male adapter dc to 26 5 GHz APC 3 5 1250 1748 50 ohm load male connector dc to 26 5 GHz APC 3 5 HP 909D option 040 Torque wrench 8 in lb 5 16 in 8710 1765 RF cable 1 m RF sou...

Page 34: ...ck in Chapter 4 Operation should suffice for incoming inspection If the test set does not pass the Operator s Check refer to the troubleshooting procedures in the HP 8510 On Site Service Manual or call your local HP Customer Engineer If the shipping container is damaged or defective keep the shipping materials and notify both the carrier and the nearest Hewlett Packard office The HP office will ar...

Page 35: ...tres 50 000 feet Preparation for Use Positioning the Test Set Typically the HP 8511A is placed under the HP 8510 network analyzer or the source whether it is rack mounted or used on a bench To install the flanges to rack mount the instrument with or without handles in a standard 19 inch rack refer to Figure 3 2 on page 3 3 Static free Workstation When installing the test set for use on a bench pla...

Page 36: ...he Rack Mounting Hardware The recommended system rack is the HP 85043C Instructions for rack mounting the HP 8511A in a system configuration with the HP 8510 are provided in the Installation section of the HP 8510 On Site Service Manual and in the HP 85043C System Rack Installation Manual HP part number 85043 90022 ...

Page 37: ...cal outlet and the line module to supply power to the frequency converter 2 Connect the test set IF interconnect cable from the J11 TEST SET INTERCONNECT connector on the rear panel of the HP 8511A to the J1 TEST SET INTERCONNECT connector on the rear panel of the HP 85102 IF detector 3 Connect the system bus cable from the HP 8511A J12 HP 8510 SYSTEM BUS connector to the HP 8510 INTERCONNECT conn...

Page 38: ...HP 8511A Test Set Operating and Service Manual 3 5 Installation Connecting the Test Set Figure 3 3 HP 8511A System Connections ...

Page 39: ...erials are used wrap the test set in heavy paper or anti static material If shipping to an HP Office or Service Center complete and attach a service tag refer to the Installation chapter in the HP 8510 On Site Service Manual Use sufficient shock absorbing material on all sides of the HP 85llA to provide a thick firm cushion and to prevent movement Seat the shipping container securely and mark it F...

Page 40: ...input ports 13 dBm 20 mW or 1 0 Vdc Front Panel Features Figure 4 1 Front Panel Features 1 Line Switch This switch turns the test set on and off When the side of the switch labeled O is depressed the test set is off l is on 2 Line LED This LED goes on and off with the test set 3 Active LED This LED lights about two seconds after power is turned on following the successful conclusion of self test 4...

Page 41: ... only in test sets with Option 001 It allows connecting a second test set to an HP 8510 system and automatically selecting the IF output from either test set for processing by the HP 8510 7 J11 Test Set Interconnect This connector transmits the IF signal from the test set to the HP 85102 IF Detector It also transmits control signals bidirectionally 8 HP 8510 System Bus Address Switch This five gan...

Page 42: ... Those indications mean that the instrument has passed its self test In case of difficulty refer to the Main Troubleshooting Procedure chapter in the n the HP 8510 On Site Service Manual or contact your local HP Service Office Turn on the source and then the HP 8510 1 Press PRESET on the HP 85102 to preset the HP 8510 HP 8360 series systems Press STIMULUS MENU STEP and then use the entry keys to s...

Page 43: ... RF source cable to the pad as shown in Figure 4 3 on page 4 4 Connect the other end of the RF source cable to the output of the source Rotate the semi rigid cables to the required position for connection to ports a1 and b1 Tighten all connections Figure 4 3 Hardware Configuration for Operator s Check 3 Press PARAMETER MENU User 1 a1 to observe the a1 power level trace Figure 4 4 Typical Operator ...

Page 44: ...ress User 3 a2 REDEFINE PARAMETER PHASE LOCK a2 REDEFINE DONE to observe the a2 power level trace 7 Press User 2 b2 REDEFINE PARAMETER PHASE LOCK a2 REDEFINE DONE to see the b2 trace 8 If any of the traces are not within the limits noted in this procedure check all of the connections and repeat the procedure If symptoms persist refer to the Service and Equipment Overview chapter in the HP 8510 On ...

Page 45: ...1 unless another test set is to be connected When the measurement on test set number 1 is complete then the HP 8510 can control test set number 2 In a standard test set the 20 MHz IF and control signals are applied directly to J11 TEST SET INTERCONNECT which connects to the HP 8510 Option 001 adds a set of IF switches control switches and the JIO TEST SET INTERCONNECT connector This allows the sel...

Page 46: ...ration Controlling Multiple Test Sets Figure 4 5 RF and IF Switching with Two Test Sets Table 4 2 HP 33311C Coaxial Switch Positions with Two Test Sets New ADDRESS of Test Set Test Set Selected HP 33311C Coaxial Switch Port Selected 20 1 Port 1 21 2 Port 2 ...

Page 47: ... to connect test set number 1 J11 to the HP 8510 Use the supplied test set interconnect cable to connect test set number 2 J11 to test set number 1 J10 You may continue this test set daisy chain to include up to four test sets if the total length of all test set interconnect cables does not exceed 13 meters about 40 feet The last test set in the chain does not require option 001 If the RF coaxial ...

Page 48: ... IF signals from the test set are applied directly to J11 TEST SET INTERCONNECT When the test set is inactive the IF signals appearing at J10 are passed through to J11and on to the next test set or the HP 8510 The address of the test set can be changed manually from the HP 8510 front panel by selecting the ADDRESS of TEST SET function then entering the address of the test set and pressing XI or it...

Page 49: ... 6 RF and IF Switching with Four Test Sets Table 4 3 HP 33311C Coaxial Switch Positions with Four Test Sets New ADDRESS of Test Set Test Set Selected HP 33311C Coaxial Switch Port Selected Switch 1 Switch 2 20 1 Port 1 Port 1 21 2 Port 1 Port 2 22 3 Port 2 Port 1 23 4 Port 2 Port 2 ...

Page 50: ... to the current test set can be turned on without any HP 8510 caution messages appearing This will cause errors in the displayed data because incorrect error coefficients are applied to the measured data It may be convenient to store a hardware state file and an instrument state file for each combination of test set and cal set You may also store your hardware sate file on a disk for future use To...

Page 51: ...or later comparison 6 Use ADDRESS of TEST SET to select test set number 2 7 Switch back to test set number 1 8 Observe any difference in the response between the stored trace and the result after switching back and forth between the test sets Repeat for each of the test sets Any difference in the data believed due to the option 001 IF switch or RF switching must be investigated Performance Verific...

Page 52: ...ftware assembly HP part number 08511 60024 This assembly includes performance verification software with on line help and an installation and getting started manual HP part number 5962 0493 Follow the HP 8511A B and Antenna Measurement System Performance Verification Software assembly documentation to install the software and to verify the performance of your test set ...

Page 53: ...lace the HP 8515 test set on top of the HP 8511A Connect the HP 8515 test set in the system by connecting the GPIB the test set IF interconnect the RF source power and the line power to it 3 Turn on the HP 8511A and treat it like a device under test You will use the HP 8515 test set to make S11 measurements of each port on the HP 8511A 4 Perform the calibration at the end of the cable and take car...

Page 54: ...of the HP 8511A manual contains service information and replaceable parts lists Topics covered in this chapter include checks of the major assemblies and assembly removal procedures Other service information is also located in the MAIN TROUBLESHOOTING section of the HP 8510 On Site Service Manual ...

Page 55: ...ealize the cost savings Thus assemblies required for spare parts stock should be ordered by the new assembly part number which is included in the replaceable parts list of this section See the parts list for the orderable part numbers A2 IF multiplexer board assembly option 001 only A3 VTO summing amplifier board assembly A4 GPIB board assembly A10 A11 A12 13 sampler assembly inputs bl b2 a1 a2 A1...

Page 56: ...4 08511 20004 1 Cable RF A13J1 A2 W13 08511 60021 1 Cable SMA SMB 150C W15 08511 60022 1 Cable SMA SMB 150C W16 08513 60136 1 Cable SMB MSC 483W W18 08513 60138 1 Cable SMB MSC 457W W20 08513 60140 1 Cable SMB SMB 305W W13 08513 60133 1 Cable assembly A3J1 A14J1 W14 08513 60134 1 Cable assembly A3J2 J11A7 C22 23 26 08513 60144 1 Cable SMB MSC 457W W25 08513 60145 1 Cable SMB MSC 610W W26 08513 601...

Page 57: ...06 1 GPIB interface board assembly 08513 60156 2 ENC assembly doubler 08513 65002 1 INTMD board assembly 08514 60010 1 Rear panel 08515 80003 1 PROM program 0955 0207 1 Attenuator 5 dB 2 W SMA 1250 1251 1 Adapter F SMA F SMA 1252 4694 1 CAP PROT 50PIN F 1252 4695 1 CAP PROT 50PIN M 1252 5007 1 CAP PROT 24PIN F 1400 0054 1 CLP CA 07D 37W 1400 0650 2 CLP CA 25D 75W 1400 0757 1 CLP CA 25D 1 00W 1400 ...

Page 58: ...62 3757 1 Cover side 5062 3989 1 Front handle kit 5062 6618 4 3 5 mm bulkhead female connector 5087 7041 1 Frequency converter sampler assembly 6990 0028 5 Hole plug 438 DNY 6990 0086 5 Hole plug 375 DNY 8120 1348 1 Cable BNC 1 foot 8120 3445 1 Cable GPIB 1 meter 85102 00041 2 Cover blank 9220 4962 1 End cap Corr Flt 08510 10035 1 Test Set Performance Software Table 6 1 HP 8511A Replaceable Parts ...

Page 59: ...screws and washers that hold the transformer onto the rear panel 4 Using a large pozidriv screwdriver remove the screw that holds the transformer angle bracket to the main deck The transformer wires soldered to the line module are short so do not pull the transformer out too far 5 Carefully remove the transformer from the test set and put it on the bench close to the test set 6 Strip the heat shri...

Page 60: ...HP 8511A Test Set Operating and Service Manual 6 7 Service and Replaceable Parts Replacement Procedures Figure 6 1 Wire Connections to Line Module FL1 ...

Page 61: ...v screwdriver remove the four screws and washers that hold the transformer onto the rear panel 4 Using a large pozidriv screwdriver remove the screw that holds the transformer angle bracket to the main deck The transformer wires soldered to the line module are short so do not pull the transformer out too far 5 Carefully remove the transformer from the test set and put it on the bench close to the ...

Page 62: ...ure 1 Remove the semi rigid cable attached to each of the four samplers 2 Remove the two in line attenuators from the samplers 3 Remove the six flexible cables from the frequency converter by gently pulling on the gold connector 4 Remove the four frequency converter mounting plate screws and the bracket screw that fastens the frequency converter to the chassis 5 Unplug the ribbon cable near the fr...

Page 63: ...6 10 HP 8511A Test Set Operating and Service Manual Service and Replaceable Parts Replacement Procedures Figure 6 2 HP 8511A Major Assemblies ...

Page 64: ...HP 8511A Test Set Operating and Service Manual 6 11 Service and Replaceable Parts Replacement Procedures Figure 6 3 HP 8511A Miscellaneous Mechanical Chassis and Electrical Parts ...

Page 65: ...2J7 W3 08513 60123 1 Cable assembly A10J3 A2J4 W4 08513 60124 1 Cable assembly A11J3 A2J10 W5 08513 60125 1 Cable SMB MSC 635W W6 08513 60126 1 Cable SMB MSC 533W W7 08513 60127 1 Cable SMB MSC 737W W8 08513 60128 1 Cable assembly A2J11 J11A3 W9 08513 60129 1 Cable SMB MSC 711W W10 08513 60130 1 Cable SMB MSC 546W W11 08513 60131 1 Cable SMB MSC 762W W12 08513 60132 1 Cable SMB MSC 457W W15 08513 ...

Page 66: ...HP 8511A Test Set Operating and Service Manual 6 13 Service and Replaceable Parts Replacement Procedures Figure 6 4 Parts Unique to HP 8511A Option 001 ...

Page 67: ...6 14 HP 8511A Test Set Operating and Service Manual Service and Replaceable Parts Replacement Procedures Figure 6 5 HP 8511A Motherboard ...

Page 68: ...n Attenuator 1 Section 3 Out XA5 24 XA5 3 XA5 23 XA5 2 9 3 5 11 A1S41 A1S40 A1S11 A1S10 Attenuator 1 Section 4 In Attenuator 1 Section 4 Out Attenuator 2 Section 1 In Attenuator 2 Section 1 Out XA5 25 XA5 1 XA5 44 XA5 22 10 4 2 13 A2S21 A2S20 A2S31 A2S30 Attenuator 2 Section 2 In Attenuator 2 Section 2 Out Attenuator 2 Section 3 In Attenuator 2 Section 3 Out XA5 18 XA5 42 XA5 40 XA5 20 9 3 5 11 A2...

Page 69: ... 1 Bias Voltage Out XA4 6 XA4 26 J8 Rear Panel Port 1 Front Panel 19 20 17 18 6 6 6 1 P2BIASIN P2BIASOUT SWEPTBIAS SBA1 Port 2 Bias Voltage In Port 2 Bias Voltage Out Swept Bias A1 Sampler On Off J6 Rear Panel Port 2 Front Panel XA3 24 XA3 4 15 16 13 14 1 1 5 1 SBA2 SBB1 SBB2 TEMP2 A2 Sampler On Off B1 Sampler On Off B2 Sampler On Off Analog Temperature Sensor XA3 26 XA3 3 XA3 25 XA3 1 5 1 VSET 5V...

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