Keysight Technologies U2020 X Series Service Manual
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Keysight Technologies U2020 X Series Service Manual

Keysight Technologies U2020 X Series Service Manual

Usb peak and average power sensors
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Keysight U2020 X-Series
USB Peak and Average
Power Sensors
Service Guide

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Summary of Contents for Keysight Technologies U2020 X Series

  • Page 1 Keysight U2020 X-Series USB Peak and Average Power Sensors Service Guide...
  • Page 2 DOCUMENT IS PROVIDED “AS IS,” sition Regulation (“FAR”) 2.101. Pursu- AND IS SUBJECT TO BEING © Keysight Technologies 2012 - 2018 ant to FAR 12.212 and 27.405-3 and CHANGED, WITHOUT NOTICE, IN No part of this manual may be repro- Department of Defense FAR Supple- FUTURE EDITIONS.

  • Page 3: Safety Considerations

    Safety Considerations Read the information below before using this instrument. The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument.

  • Page 4: Environmental Conditions

    Environmental Conditions The U2020 X-Series is designed for indoor use and in an area with low condensation. The table below shows the general environmental requirements for this instrument. Environmental cond ition Requirement Operating condition – 0 °C to 55 °C Temperature Storage condition –...

  • Page 5: Regulatory Information

    Regulatory Information The U2020 X-Series complies with the following Electromagnetic Compatibility (EMC) compliances: EMC compliance – IEC 61326-1:2005/EN 61326-1:2006 – Canada: ICES/NMB-001:Issue 4, June 2006 – Australia/New Zealand: AS/NZS CISPR11:2004 Keysight U2020 X-Series Service Guide...

  • Page 6: Regulatory Markings

    Regulatory Markings This instrument complies with the WEEE Directive (2002/96/EC) marking The RCM mark is a registered requirement. This affixed product label trademark of the Australian indicates that you must not discard Communications and Media Authority. this electrical or electronic product in domestic household waste.

  • Page 7: Waste Electrical And Electronic Equipment (Weee) Directive

    Waste Electrical and Electronic Equipment (WEEE) Directive This instrument complies with the WEEE Directive marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste. Product category: With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument”...

  • Page 8: In This Guide

    In This Guide... Chapter 1, "General Information" Chapter 1 provides the specifications and maintenance information of the U2020 X-Series. Chapter 2, "Performance Verification and Ad justments" Chapter 2 contains the performance verification procedures which verify that the U2020 X-Series is operating within its published specifications. This chapter also provides information on adjustments performed after a performance verification fails.

  • Page 9: Table Of Contents

    Table of Contents Safety Considerations ........3 Environmental Conditions .
  • Page 10 Troubleshooting ......... . . 42 Repair .

  • Page 11: List Of Figures

    List of Figures Figure 2-1 Measured rise time percentage error versus signal-un- der-test rise time ......25 Figure 3-1 Internal zeroing and calibration block diagram .
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  • Page 13: List Of Tables

    List of Tables Table 4-1 Replaceable parts list for the U2020 X-Series ..44 Keysight U2020 X-Series Service Guide...
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  • Page 15 Keysight U2020 X-Series USB Peak and Average Power Sensors Service Guide General Information Specifications and Characteristics Cleaning This chapter provides the specifications and maintenance information of the U2020 X-Series USB peak and average power sensors.

  • Page 16: General Information

    General Information Specifications and Characteristics For the U2020 X-Series specifications and characteristics, refer to the U2020 X-Series Data Sheet at http://literature.cdn.keysight.com/litweb/pdf/ 5991-0310EN.pdf. Keysight U2020 X-Series Service Guide...

  • Page 17: Cleaning

    General Information Cleaning Use a clean, water-dampened cloth to clean the body of the U2020 X-Series. Connector care A solution of pure isopropyl or ethyl alchohol can be used to clean the connector but make sure to keep in mind on its flammable nature. –...
  • Page 18 General Information THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2020 X-Series Service Guide...
  • Page 19 Keysight U2020 X-Series USB Peak and Average Power Sensors Service Guide Performance Verification and Adjustments Equipment List Voltage Standing Wave Ratio (VSWR) Performance Verification Sensor Accuracy Performance Verification Rise Time and Overshoot Performance Verification Zero Set Performance Verification 10 MHz Timebase Accuracy Performance Verification Adjustments This chapter contains the performance verification procedures which verify that the U2020 X-Series is operating within its published specifications.

  • Page 20: Performance Verification And Adjustments

    Performance Verification and Adjustments Equipment List The following equipment are required for performance verification: Recommended Keysight model Equipment Critical specification number/part number Frequency range: 10 MHz to 40 GHz or above Network analyzer Dynamic range: 94 dB E8361A/E8361C/E8363B/E8363C Trace noise: <0.006 dB Calibration kit Frequency range: DC to 18 GHz or above 85054A/85054D/85056A/85056D...

  • Page 21: Voltage Standing Wave Ratio (Vswr) Performance Verification

    Performance Verification and Adjustments Voltage Standing Wave Ratio (VSWR) Performance Verification VSWR is a measure of how efficiently an RF power is transmitted from an RF power source. In real systems, mismatched impedances between the RF source and load can cause some of the power to be reflected back towards the source and vary the VSWR.

  • Page 22: Sensor Accuracy Performance Verification

    Performance Verification and Adjustments Sensor Accuracy Performance Verification The purpose of this verification is to verify the accuracy of the U2020 X-Series after a period of usage to ensure that the U2020 X-Series is still within its published specifications. This performance verification requires the following equipment: –...
  • Page 23 Performance Verification and Adjustments 5 Set the frequency of the signal source to 50 MHz and power level to 0 dBm. Turn on the RF output. 6 Set the frequency of the N1912A channels A and B to the same frequency as the signal source.
  • Page 24 Performance Verification and Adjustments The accuracy error measured in this verification includes a combination of errors NOTE for linearity, calibration factor, and temperature compensation. Frequency band U2021XA U2022XA 50 MHz to 500 MHz 4.2% 4.3% >500 MHz to 1 GHz 4.0% 4.3% >1 GHz to 10 GHz...

  • Page 25: Rise Time And Overshoot Performance Verification

    Performance Verification and Adjustments Rise Time and Overshoot Performance Verification Rise time verification is required to verify the system rise time of the analog measurement path, from the bulkhead to the inputs of the analog-to-digital converter (ADC). A pulse generator is used to modulate an RF signal generator with fast rise time, and this is captured by the ADC.
  • Page 26 Performance Verification and Adjustments Although the rise time specification is 13 ns, this does not mean that the U2020 ≤ X-Series can accurately measure a signal with a known rise time of 13 ns. The measured rise time is the root sum of the squares (RSS) of the signal-under-test (SUT) rise time and the system rise time (13 ns): √...
  • Page 27 Performance Verification and Adjustments Equipment Key setting Trace mode, undecimated U2020 X-Series Trace length: <1.2 ms 81130A SCPI commands *RST *CLS VOLT1 1.5V VOLT1:OFFS 750mV DIG:PATT:SEGM1:LENG 26 DIG:PATT:SEGM1:PRES1 1,26 DIG:PATT:SEGM1:PRES2 1,26 DIG:PATT:SEGM2:LENG 24 DIG:PATT:SEGM2:PRES 0,24 DIG:PATT:SEGM2:PRES 0,24 DIG:PATT:LOOP:INF ON DIG:PATT:LOOP:INF:STAR SEGM1 TRIG:SOUR INT DIG:PATT ON DIG:SIGN1:FORM NRZ...
  • Page 28 Performance Verification and Adjustments U2020 X-Series SCPI commands (Repeat for all frequency test points.) SENS:FREQ 50E6/100E6/499E6/500E6/1E9 INIT:CONT OFF CAL:ALL TRIG:SOUR EXT INIT:CONT OFF TRAC:STAT ON SENS:TRAC:TIME 200E-6 SENS:TRAC:OFFS:TIME 0 TRAC:UNIT W TRIG:DEL 0 SENS:AVER OFF E8257D SCPI commands "FREQ 1E9" "POW 0"...
  • Page 29 Performance Verification and Adjustments MATLAB code (calculate the rise time of the captured trace using the equivalent time sampling method) data=A; eff_data_hi=zeros(1250,1); n=0; for j=1:50 for k=1:25 n=n+1; m=j + (k-1)*50 eff_data_hi(n)=eff_data_hi(n)+data(m); X=eff_data_hi The pulse top and pulse bottom are determined by histogramming the captured trace.

  • Page 30: Zero Set Performance Verification

    Performance Verification and Adjustments Zero Set Performance Verification The zero set verification is required to verify that a minimal amount of residual offset error is present after zeroing has been performed. The offset error is caused by contamination from several sources including the noise of the DUT itself. Zero set is the difference between the power levels indicated by the DUT, after executing zeroing and the true zero power.
  • Page 31 Performance Verification and Adjustments Connection diagram No RF present during zeroing Bulkhead U2020 X-Series To USB port RF present during zeroing ESG vector signal generator RF out Bulkhead U2020 X-Series To USB port Test equipment settings Equipment Key setting Free-run mode U2020 X-Series Auto-averaging enabled Keysight U2020 X-Series Service Guide...
  • Page 32 Performance Verification and Adjustments Procedure For zero set with no RF present during zeroing: 1 Ensure that the DUT has been allowed to warm up for approximately an hour before attempting to measure zero set. 2 Set the channel frequency of the DUT by sending " FREQ 50MHz/100MHz/ ".
  • Page 33 Performance Verification and Adjustments 10 Read the noise level of the DUT by sending " " and record the reading. READ? 11 Repeat steps 7 to 10 for 10 times and then calculate the mean value of the readings. 12 Compare the calculated mean value to the system specifications. If the verification fails, refer to “Adjustments”...

  • Page 34: 10 Mhz Timebase Accuracy Performance Verification

    Performance Verification and Adjustments 10 MHz Timebase Accuracy Performance Verification The 10 MHz timebase accuracy verification is required to verify the accuracy of time-based measurements made with the U2020 X-Series. This performance verification requires a frequency counter (53132A). System specifications: Timebase accuracy = ±25 ppm Connection diagram Frequency counter Bulkhead...
  • Page 35 Performance Verification and Adjustments 53132A SCPI commands *RST *CLS INP1:IMP 50 INIT FETC? Procedure 1 Ensure that the DUT has been allowed to warm up for approximately an hour before attempting to measure timebase accuracy. 2 Send the commands as provided above. The frequency from the 53132A must be within 10 MHz ±...

  • Page 36: Adjustments

    Performance Verification and Adjustments Adjustments Adjustments are usually required on a yearly basis. They are normally performed only after a performance verification has indicated that some parameters are out of specification. Performance verification must be completed after any repairs that may have altered the characteristics of the U2020 X-Series.
  • Page 37 Keysight U2020 X-Series USB Peak and Average Power Sensors Service Guide Theory of Operation Theory of Operation This chapter describes the operation and functions of the U2020 X-Series assembly.

  • Page 38: Theory Of Operation

    Theory of Operation Theory of Operation The U2020 X-Series internal zeroing and calibration process is used to combine the power sensor and power meter to make accurate power measurements. Figure 3-1 below shows the internal zeroing and calibration process, and explains how three objectives in this process are achieved.
  • Page 39 Theory of Operation – To verify traceability to National Standards, hence, verifying your measurements are going to perform to specification. To achieve traceable and accurate RF power measurements, each U2020 X-Series is individually characterized during its production procedure. To achieve optimal accuracy, a 3-dimensional correction is generated across power, frequency, and temperature.
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  • Page 41: Repair Guide

    Keysight U2020 X-Series USB Peak and Average Power Sensors Service Guide Repair Guide Troubleshooting Repair Replaceable Parts Disassembly/Reassembly Procedure This chapter contains information on troubleshooting, repair, and replaceable parts of the U2020 X-Series. This chapter also explains how to assemble and disassemble the U2020 X-Series.

  • Page 42: Troubleshooting

    Repair Guide Troubleshooting The U2020 X-Series represents a combination of a power meter and power sensor in one unit. If the LED is red and blinking, it indicates that there is a hardware error or operating system (OS) error in the U2020 X-Series. The LED will only blink red if the U2020 X-Series fails the self-test.

  • Page 43: Repair

    Repair Guide Repair There are no serviceable parts inside the U2020 X-Series. If the U2020 X-Series is defective, send it back to the nearest Keysight Service Center for repair. The entire “module” of the defective U2020 X-Series will be replaced with an appropriate replacement module listed in Table 4-1.

  • Page 44: Replaceable Parts

    Repair Guide Replaceable Parts Replaceable parts are only available for the use of Keysight Service Center NOTE personnel and are not available for trade sales. Table 4-1 Replaceable parts list for the U2020 X-Series Reference Part number Quantity Description designation U2021XA U2021-60002 U2021XA replacement sensor module...

  • Page 45: Disassembly/Reassembly Procedure

    Repair Guide Disassembly/Reassembly Procedure Disassemble the U2020 X-Series only in a static-free workstation. CAUTION Electrostatic discharge renders the U2020 X-Series inoperative. Disassembly procedure Use the following steps to disassemble the U2020 X-Series. 1 Remove the top label and bottom label as shown below. 2 Loosen two 0515-5012 screws on both the top and bottom housing by using the T8 torque bit (4 in.

  • Page 46: Reassembly Procedure

    Repair Guide 3 Replace the defective module with a new module. Reassembly procedure The reassembly procedure is simply the reversal of the disassembly procedure. Lock the 0515-5012 screws using the T8 torque bit at 4 in. lbs. Keysight U2020 X-Series Service Guide...
  • Page 47 Repair Guide Keysight U2020 X-Series Service Guide...
  • Page 48 Repair Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2020 X-Series Service Guide...
  • Page 49 Keysight U2020 X-Series USB Peak and Average Power Sensors Service Guide Contacting Keysight Introduction Returning the U2020 X-Series for Service This chapter explains the appropriate actions to take if you have a problem with your U2020 X-Series.

  • Page 50: Contacting Keysight

    Contacting Keysight Introduction This section provides the information on what to do if you encounter problems with your U2020 X-Series. If you wish to contact Keysight to enquire about the U2020 X-Series, from service problems to ordering information, refer to “Sales and Technical Support”...

  • Page 51: Recommended Calibration Interval

    Contacting Keysight – The suffix indicates an alphanumeric code which is used to ensure unique identification of each product throughout Keysight. SERIAL NUMBER SER MY12345678 Keysight MADE IN MALAYSIA Figure 5-1 Serial number Recommended calibration interval Keysight recommends a one-year calibration cycle for the U2020 X-Series. Keysight U2020 X-Series Service Guide...

  • Page 52: Returning The U2020 X-Series For Service

    Contacting Keysight Returning the U2020 X-Series for Service Use the information in this section if you need to return your U2020 X-Series to Keysight. Packaging the U2020 X-Series for shipment Use the following procedure to package the U2020 X-Series for shipment to Keysight for servicing: –...
  • Page 53 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2012 - 2018 Edition 4, September 1, 2018 Printed in Malaysia *U2021-90004* U2021-90004 www.keysight.com...

This manual is also suitable for:

U2021xaU2022xaU2021-60002U2022-60002

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