N1921A Operating Guide
Contents
1. to N type m adapter is intended for use only on the 1 mW 50 MHz power reference of the power meter Its function as a calibration reference may be compromised if used for other purposes 10 Performance Tests and Adjustments Test Equipment The following equipment are required for the performance tests Instrument Critical specification Recommended Agilent model number part number Signal generator Power range 50 dBm to 22 dBm at 1 GHz N5182A E8257D E8267D Rise fall time Output resistance 50 Q Signal Generator Power range 50 dBm to 20 dBm at 1 GHz E4438C E8257D E8267D Zero set Output resistance 50 Q Oscilloscope Analog Bandwidth 1 GHz and above Infiniium MSO 9104A Network analyzer Frequency Range 10 MHz to 40 GHz or above 94 dB of dynamic range 0 006 dB trace noise E8361A E8361C E8363B E8363C Calibration kit Frequency Range DC to 18 GHz or above 85054A 85054D 85056A 85056D Diode detector SMB connector 33334EZ Negative Power splitter Two Resistor type Power Splitter N type f 11667A Max Frequency 18 GHz Power meter Dual Channel Peak Power Meter N1912A Compatible with P Series and N8480 Series Power Sensor Absolute Accuracy 0 8 Power sensor Frequency 50 MHz or above N8481A N8487A Power range 30 dBm to 20 dBm SWR 1 15 at 50 MHz Wideband power sensor Power range 30 dBm to 20 dBm N1921A N1922A SWR lt 12. 14 System Level Rise and Fall Time Performance Test 2 0 0 0 cece cece eee nes 19 Zero Set Performance Test in System Level 00 ccc tte enn 22 Adjustment ERE 24 3 Theory of Operation Theory of Operation sse regere ee eye eee Segoe doen RENE TER REY 26 4 Specifications and Characteristics Introduction i s esI ae ea ea bea I PILAE ee Neat 30 Specification Definitions e a a E a aa e rr 30 Specifications e eed ia e wea baa eae Bago edie i SR 32 Frequency and Dynamic Power Range 0 ce cee eh 32 Damage Level and RF Connector Type 0 0 2 0 ccc eee ne 32 Power Sensor Maximum SWR 0 0 cee cece een ett nent E 33 Power Sensor Calibration Uncertainty 0 00 0 cece en 34 Physical Characteristics e ne eeina e EUM eae e oie ens 35 Declaration of Conformity ico REOR OE OR S DR TER Y ROS 36 5 Service What You ll Find In This Chapter 20 0 0 ccc I ene 38 General Informations 05s aes pets RR uence pe leh He dier aed ede RNC e Ed ae 39 Cleaning eo et o be ute Use SD ERDEVERSRTUUES yee hes ALL DO MEE oes 39 Connector Cleaning sasise i sch e breton wed buns TEN TR ERUNT EE spes 39 vii Contents Performance Test Agilent Sales and Service Offices viii Introduction What You ll Find In This Chapter This Chapter introduces you to the P Series Wideband Power Sensors It contains the following sections e General Information on page 3 n
3. 20 at 1 GHz Cable adapter 11730A sensor cable adapter N1911A 200 12 Instrument Critical specification Recommended Agilent model number part number N type to SMA adapter N type m to 2 4 mm f SMA 11903D 50 Q characteristic impedance Trigger cable 50 Q characteristic impedance U2032A BNC m to SMB f Voltage Standing Wave Ratio VSWR Performance Test VSWR Voltage Standing Wave Ratio is a measure of how efficiently 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 Test equipment e Network analyzer E8361A 3B 4B Agilent calibration kit 85054A D or 85056A D Test procedure Turn on the network analyzer and allow it to warm up for approximately an hour 2 Set the start frequency of the network analyzer to 50 MHz and the stop frequency to 18 GHz for the N1921A and 40 GHz for the N1922A 3 Calibrate the network analyzer using the appropriate calibration kit 85054A D for the N1921A and 85056A D for the N1922A Perform calibration for the open short and load circuits of the network analyzer 4 After calibration connect the N1923 4A to the test port of the network analyzer Turn on Correction on the network analyzer to perform the VSWR measurement 5 Compare the measured results to the specifications in Table 2 1
4. agreement will control Certification Agilent Technologies certifies that this product met its published specifications at the time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument The Instruction Documentation Symbol The product is marked with this symbol when it is necessary for the user to refer to the instructions in the supplied documentation This symbol indicates that a device or part of a device may be susceptible to electrostatic discharges ESD which can result in damage to the product Observe ESD precautions given on the product or its user documentation when handling equipment ESD bearing this mark ISM GRP 1 This is the symbol of an Industrial Scientific and Medical Group 1 CLASS A Class A product The CE mark shows that the product complies with all relevant C European Legal Directives ICES NMB 001 This ISM device complies with Canadian ICES 001 Cet appareil ISM est conforme la norme NMB 001 du Canada N10149 The C Tick mark is a registered trad
5. rise and fall time performance test setup N5182A Power meter 5 Generate the same pulse signal as previous 6 Zero the DUT on the N1911 2A 7 Setthe channel frequency of the N1911 2A to 1 GHz and the trigger mode to Continuous Trigger Mode 8 Set the N1911 2A video bandwidth to LOW and the video average to 64 9 Setthe N1911 2A display to Trace Display mode from Numerical mode Disp gt Disp Type gt Trace 10 Expand the N1911 2A display window and select Trace Control to view the rise fall time readings 11 Turn on the N5182A RF output 12 Select Auto Scale to capture the N1911 2A pulse signal 20 13 Measure and record the rise fall time of the pulse signal from the N1911 2A in Table 2 3 14 Repeat the above steps for the pulse signal with different pulse periods and different video bandwidth settings Record all the readings in Table 2 3 15 Compare the recorded readings to the specifications in the table If the test fails refer to Adjustment on page 24 Table 2 4 System level rise and fall time performance test Measured points Specification MORE nise Pass Fail time s Bandwidth LOW Power level 10 dBm 56 ns Pulse period 2 us Duty cycle 50 Bandwidth LOW Power level 10 dBm 56 ns Pulse period 10 us Duty cycle 50 Bandwidth MED Power level 10 dBm 25 ns Pulse period 2 us Duty cycle 5096 Bandwidth MED Power level 10 dBm 25 ns Pulse period 10 us Duty c
6. you run tests in which the frequency changes often such as testing multi carrier amplifiers on different bands you will notice a marked improvement in measurement speed 26 Figure 3 2 Measured rise time percentage error versus signal under test rise time E oe BB Percentage error 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Signal under test rise time nS Although the rise time specification is lt 13 ns this does not mean that the combination of P Series power meter and power sensor 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 rise time and the system rise time 13 ns 2 2 Measured rise time SignalUnderTestRiseTime SystemRiseTime The error is MeasuredRiseTime SignalUnderTestRiseTime i nder x 100 Error SignalUnderTestRiseTime 27 28 Specifications and Characteristics Introduction The P Series Wideband Power Sensors are designed for use with the P Series power meters Specification Definitions There are two types of product specifications e Warranted specifications e Characteristic specifications Warranted specifications Warranted specifications are covered by the product warranty and apply over 0 C to 55 C unless otherwise noted Warranted specifications include Measurement Uncertainty calculated with 95 confidence Characteristic specifica
7. 0 Repeat steps 5 to 19 by sweeping through the power level from 25 dBm to 10 dBm with a frequency of 50 MHz 16 Table 2 2 Power Sensor Calibration Uncertainty Sensor model N1921A N1922A Frequency band Calibration uncertainty 50 MHz to 500 MHz 4 5 500 MHz to 1 GHz 4 0 1 GHz to 10 GHz 4 0 10 GHz to 18 GHz 5 0 50 MHz to 500 MHz 4 3 500 MHz to 1 GHz 4 2 1 GHz to 10 GHz 44 10 GHz to 18 GHz 4 7 18 GHz to 26 5 GHz 5 9 26 5 GHz to 40 GHz 6 0 a In humidity gt 70 additional 0 6 should be added into the uncertainty Table 2 3 Recommended Frequency Points Frequency points for N1921A Frequency points for N1922A MR TO uae error at 0 dBm 50 MHz 50 MHz 200 MHz 300 MHz 300 MHz 500 MHz 499 MHz 1 GHz 500 MHz 7 GHz 800 MHz 12 GHz 1 5 GHz 14 GHz 17 Table 2 3 Recommended Frequency Points Frequency points for N1921A Frequency points for N1922A Calculated sensor accuracy error at 0 dBm 3 GHz 16 GHz 6 GHz 17 GHz 7 GHz 18 GHz 9 GHz 19 5 GHz 10 GHz 22 GHz 12 GHz 23 GHz 12 4 GHz 24 GHz 13 GHz 26 GHz 14 GHz 26 5 GHz 15 GHz 28 GHz 16 GHz 30 GHz 17 GHz 32 GHz 18 GHz 33 GHz 34 GHz 35 GHz 36 GHz 37 GHz 38 GHz 39 GHz 40 GHz a The accuracy error measured in this test includes the combination of errors for linearity calibration factor and tempe
8. 6 If the test fails refer to Adjustment on page 24 13 Table 2 1 Voltage Standing Wave Ratio VSWR Performance Test Sensor model Frequency band Maximum SWR N1921A 50 MHz to 10 GHz 1 2 10 GHz to 18 GHz 1 26 N1922A 50 MHz to 10 GHz 1 2 10 GHz to 18 GHz 1 26 18 GHz to 26 5 GHz 1 3 26 5 GHz to 40 GHz 1 3 Sensor Accuracy Performance Test The purpose of this test is to verify the accuracy of the N1921 2A after a period of usage to ensure that the N1921 2A is still within its published specifications Test equipment Signal generator N5182A Power meter N1912A e Wideband power sensor N1921 2A Power sensors N8481A N8487A e Cable adapter N1911A 200 Power splitter 11667A Test procedure 1 Turn on the N5182A and N1912A Allow them to warm up for approximately an hour 2 Connect the standard sensor N8481A 7A to the N1912A channel A and the incident sensor N1921 2A to the N1912A channel B 3 The test equipment setup is as shown in Figure 2 1 14 Figure 2 1 Sensor accuracy performance test setup Signal source x Incident sensor QD Standard sensor 4 Zero and calibrate the standard and incident sensors on channels A and B respectively 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 7 Measure
9. Operating and Service Guide P Series Wideband Power Sensor N1921A and N1922A se 2 Agilent Technologies Manufacturing Part Number N1920 90007 Printed in Malaysia Fifth Edition October 10 2012 Copyright Agilent Technologies Inc 2005 2012 Notices No part of this manual may be reproduced in any form or by any means including electronic storage and retrieval or translation into a foreign language without prior agreement and written consent from Agilent Technologies Inc as governed by United States and international copyright laws Agilent Technologies Inc Bayan Lepas Free Industrial Zone 11900 Penang Malaysia General Warranty The material contained in this document is provided as is and is subject to being changed without notice in future editions Further to the maximum extent permitted by applicable law Agilent disclaims all warranties either express or implied with regard to this manual and any information contained herein including but not limited to the implied warranties of merchantability and fitness for a particular purpose Agilent shall not be liable for errors or for incidental or consequential damages in connection with the furnishing use or performance of this document or any information contained herein Should Agilent and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate
10. bination of traditional linearity calibration factor temperature specifications and the uncertainty associated with the internal calibration process Power Sensor Calibration Uncertainty Sensor Frequency Band Calibration Model Uncertainty N1921A 50 0 MHz to 500 0 MHz 4 596 500 0 MHz to 1 0 GHz 4 096 1 0 GHz to 10 0 GHz 4 096 10 0 GHz to 18 0 GHz 5 096 N1922A 50 0 MHz to 500 0 MHz 4 396 500 0 MHz to 1 0 GHz 4 2 1 0 GHz to 10 0 GHz 4 496 10 0 GHz to 18 0 GHz 4 7 18 0 GHz to 26 5 GHz 5 9 26 5 GHz to 40 0 GHz 6 0 a In humidity greater than 70 an additional 0 6 should be added to these values 34 Table 4 6 Physical Characteristics Table 4 5 Physical Dimensions Sensor Dimensions Model N1921A Length 137 mm 5 4 in Width 42 mm 1 65 in Height 28 mm 1 1 in N1922A Length 129 mm 5 1 in Width 42 mm 1 65 in Height 28 mm 1 1 in Sensor Cable Lengths and Weights Option Length Weight with cable Option 105 standard 1 5 m 5 feet 0 4 kg 0 88 Ib Option 106 3 0 m 10 feet 0 6 kg 1 32 Ib Option 107 10 m 31 feet 1 4 kg 3 01 Ib 35 NOTE Declaration of Conformity The Declaration of Conformity DoC for this instrument is available on the Agilent Web site You can search the DoC by its product model or description at the Web address below http regulations corporat
11. cause a potential shock hazard that could result in personal injury Sound Emission Herstellerbescheinigung Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenlarminformationsverordnung vom 18 Januar 1991 Sound Pressure LpA lt 70 dB Am Arbeitsplatz e Normaler Betrieb e Nach DIN 45635 T 19 Typprufung Manufacturers Declaration This statement is provided to comply with the requirements of the German Sound DIN 45635 T 19 Typprufung Sound Pressure LpA lt 70 dB At operator position e Normal operation e According to ISO 7779 Type Test vi Contents 1 Introduction What You ll Find In This Chapter 2 0 0 0 0c c ccc teen ent e eas 2 General Information s REM end oo aad Hain See tee es 3 Initial Inspection o5 poi REPRE RE ee Be ee ee ee 3 Power Meter and Sensor Cable Requirements 00 0c cece ccc ene eens 4 Interconn ctions ine iee a oo USER RUE RR AER RE CE RR 4 Recommended Calibration Interval l l 4 Calibration 9 wes e o Rd tt ed ets boe ed E 6 Overview of the P Series Wideband Power Sensors llle eese 7 The Internal Zero and Calibration 00 0 0 eect ene 7 2 Performance Tests and Adjustments Rest Equipment 2 mE ee te a A BS Ree AG ete ge as 12 Voltage Standing Wave Ratio VSWR Performance Test 00 cece eee eee eee 13 Sensor Accuracy Performance Test nunun cece ccc t teen tenn n ees
12. e agilent com DoC search htm If you are unable to search for the respective DoC please contact your local Agilent representative 36 Service 37 What You ll Find In This Chapter This Chapter introduces you to the P Series Wideband Power Sensors It contains the following sections e General Information on page 39 Agilent Sales and Service Offices on page 40 38 General Information This chapter contains information about general maintenance performance tests troubleshooting and repair of the P Series Wideband Power Sensors Cleaning Use a clean damp cloth to clean the body of the P Series Wideband Power Sensor Connector Cleaning The RF connector beads deteriorate when contacted by hydrocarbon compounds such as acetone trichloroethylene carbon tetrachloride and benzene Clean the connector only at a static free workstation Electrostatic discharge to the center pin of the connector will render the power sensor inoperative Keeping in mind its flammable nature a solution of pure isopropyl or ethyl alcohol can be used to clean the connector Clean the connector face using a cotton swab dipped in isopropyl alcohol If the swab is too big use a round wooden toothpick wrapped in a lint free cotton cloth dipped in isopropyl alcohol Performance Test The Performance and Calibration Tests require the sensor to be returned to the factory To arrange this contact the service centre See Agile
13. e source Agilent s patented technology integrates a DC reference source and switching circuits into each N1921 2A so you can zero and calibrate the N1921 2A while it is connected to a device under test This feature removes the need for connection and disconnection from the calibration source thereby reducing test times measurement uncertainty and wear and tear on connectors It is especially useful in manufacturing and automated test environments where every second and every connection counts The N1921 2A can be embedded within test fixtures without the need to switch in reference signals Simplified Sensor Block Diagram From CAL DAC Zero and Cal To wideband Path Switching amplifier and 100 MHz Sampler Diode Detectors To ensure the accuracy of power measurements and improve measurement speed the N1921 2A uses a four dimensional 4 D modeling technique that measures input power frequency temperature and output voltage across the N1921 2A specified measurement ranges Data from this 4 D model is generated during Agilent s initial factory calibration of the N1921 2A and stored in EEPROM All the compensation data is downloaded to the power meter peak power analyzer at power on or when the N1921 2A is connected Advanced algorithms are used to quickly and accurately evaluate the N1921 2A against this model without requiring the power meter peak power analyzer to interpolate the calibration factors and linearity curves If
14. emark of the Australian Communications Authority This signifies compliance with the Australian EMC Framework Regulations under the terms of the Radio Communications Act of 1992 E Safety Notices This guide uses warnings and cautions to denote hazards WARNING A warning calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning until the indicated conditions are fully understood and met CAUTION WARNING A caution calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in damage to or the destruction of part or all of the equipment Do not proceed beyond a caution until the indicated conditions are fully understood and met General Safety Information 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 of design manufacture and intended use of the instrument Agilent Technologies assumes no liability for the customer s failure to comply with these requirements BEFORE CONNECTING THE POWER SENSOR TO OTHER INSTRUMENTS ensure that all instruments are connected to the protective earth ground Any interruption of the protective earth grounding will
15. he Internal Zero and Calibration explains how three objectives in this process are achieved Simplified Sensor Block Diagram From CAL DAC Voltage Reference To wideband 100 MHz Sampler Diode Detectors 1 To account for the environment that the system is working in the temperature and the presence of electromagnetic signals This is achieved during the nternal Zero process where the Diode Detectors are isolated from the active amplifier circuitry The process allows the zero measurement to be made regardless of the RF input signal thus allowing the sensor to remain connected to the DUT The isolation is achieved by a network of transistor switches in the zero and calibration path switching 2 To account for the combining of the sensor and meter as these may never have been used together as a system NOTE This is achieved during the Internal Calibration the Amplifier Circuitry is isolated from the Diode Detectors by a network of transistor switches and the sensor s voltage reference is routed to the Amplifier Circuitry 3 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 sensor is individually characterized during its production procedure To achieve optimal accuracy a 3 dimensional correction is generated across power frequency and temperature T
16. his uses advanced modeling techniques and is superior in accuracy and speed of evaluation to the overlaying of linearity temperature corrections and calibration factors As a confidence check of the connector integrity the P Series Wideband Power Sensor can be connected to any known good signal source for example the 50 MHz 0 dBm reference and a comparison made The calibration factors are stored in the EEPROM during the manufacturing process All the compensation data is downloaded to the P series power meter at power on or when the power sensor is connected Between 50 MHz and 500 MHz the sensor is sensitive to the RF signal propagating through onto the Detector Amplifier Circuitry and resulting in distorted power measurements To reduce this effect additional filtering is switched into the measurement path which results in a 15 MHz video bandwidth limitation for signals below 500 MHz The P Series Wideband Power Sensor performs internal zero and calibration automatically upon AC power up However to perform a manual confidence check with an external reference power source 1 mW 50 Mhz a2 4 mm f to N type m adapter is needed as the P Series Wideband Power Sensor is fitted with a2 4 mm m connector This adapter is not shipped together with the P Series Wideband Power Sensor Table 1 3 NOTE Adapter Part number Description Item 08487 60001 Adapter 50 MHz 2 4 mm deme The 2 4 mm f
17. inimum of two hours at a stable temperature within the operating temperature range and turned on for at least 30 minutes The power meter and power sensor are within their recommended calibration periods Used in accordance to the information provided in the Power Meter s User s Guide 31 Specifications Frequency and Dynamic Power Range Table 4 1 Frequency and Dynamic Power Range Sensor Frequency Range Dynamic Power Range Model N1921A 50 MHz to 18 GHz 35 dBm to 20 dBm gt 500 MHz 30 dBm to 20 dBm 50 MHz 500 MHz N1922A 50 MHz to 40 GHz 35 dBm to 20 dBm 2500 MHz 30 dBm to 20 dBm 50 MHz 500 MHz Damage Level and RF Connector Type Table 4 2 Damage Level and RF Connector Type Sensor Damage Level Damage Level RF Connector Model Average Power Peak Power Type N1921A 23 dBm 30 dBm 1us duration Type N m N1922A 23 dBm 30 dBm lt lus duration 2 4 mm m 32 Power Sensor Maximum SWR Table 4 3 Power Sensor Maximum SWR Sensor Frequency Band Maximum SWR Model N1921A 50 0 MHz to 10 0 GHz 1 2 10 0 GHz to 18 0 GHz 1 26 N1922A 50 0 MHz to 10 0 GHz 1 2 10 0 GHz to 18 0 GHz 1 26 18 0 GHz to 26 5 GHz 1 3 26 5 GHz to 40 0 GHz 1 5 33 Table 4 4 Power Sensor Calibration Uncertainty Definition Uncertainty resulting from non linearity in the sensor detection and correction process This can be considered as a com
18. itial Inspection on page 3 Power Meter and Sensor Cable Requirements on page 4 Interconnections on page 4 Calibration on page 6 Overview of the P Series Wideband Power Sensors on page 7 Figure 1 1 General Information Welcome to the P Series Wideband Power Sensors Operating and Service Guide This guide contains information about the initial inspection connection and specifications of the P Series Wideband Power Sensors You can also find a copy of this guide on the Documentation CD ROM supplied with the P series power meters P Series Wideband Power Sensors e Agilent N1922A so SoMHz 4s0GHz Power Meters only e M EH E E Earth ground Use with Agilent Technologies P Series must be connected at meter Oniy turn connector nut to tighten SON cm Bib an To make best use of your sensor refer to the chapter Using P Series Power Sensors in the P Series Power Meter User s Guide Initial Inspection Inspect the shipping container for damage If the shipping container or packaging material is damaged it should be kept until the contents of the shipment have been checked mechanically and electrically If there is mechanical damage notify the nearest Agilent office Keep the damaged shipping materials if any for inspection by the carrier and an Agilent representative See Agilent Sales and Service Offices on page 40 Table 1 1 WARNING Power Meter and Sensor Cable Re
19. lity from the link below http www home agilent com agilent redirector jspx action ref amp cname A GIL ENT EDITORIAL amp ckey 1956605 amp lc eng amp cc M Y amp nfr 536902922 53689 4476 Go through the readme file Establish a GPIB connection between the signal generator power meter and the PC by using the USB GPIB interface and a GPIB cable Download and install Agilent VEE Pro Runtime 9 0 or above The power meter N1911 2A and the signal generator E4438C must be added to the Instrument Manager Go to Start gt Program gt Agilent VEE Pro 9 0 or above Runtime Config gt IO Configuration Select Find to find the connected instrument and Save to save the configuration 10 Run the Wideband Power Sensor Zero Set Verification Utility 23 Adjustment Adjustments are usually required on a yearly basis They are normally performed only after a performance test has indicated that some parameters are out of specification Performance tests must be completed after any repairs that may have altered the characteristics of the N1921 2A The N1921 2A is required to be returned to Agilent for adjustments To arrange this contact the Agilent Service Center Refer to the last page of this guide for information 24 Theory of Operation Figure 3 1 Theory of Operation The N1921 2A is integrated with the internal zeroing and calibration capability which eliminates the need for sensor calibration using an external referenc
20. nt Sales and Service Offices on page 40 for this information Repair of Defective Sensor There are no serviceable parts inside the P Series Wideband Power Sensors If the sensor is defective it needs to be returned to an Agilent service center 39 Agilent Sales and Service Offices In any correspondence or telephone conversations refer to the power meter by its model number and full serial number With this information the Agilent representative can quickly determine whether your unit is still within its warranty period UNITED STATES Agilent Technologies tel 1 800 829 4444 CANADA EUROPE JAPAN Agilent Technologies Canada Inc Test amp Measurement tel 1 877 894 4414 Agilent Technologies Test amp Measurement European Marketing Organization tel 31 20 547 2000 Agilent Technologies Japan Ltd tel 81 426 56 7832 fax 81 426 56 7840 LATIN AMERICA AUSTRALIA and NEW ZEALAND ASIA PACIFIC Agilent Technologies Latin America Region Headquarters USA tel 305 267 4245 fax 305 267 4286 Agilent Technologies Australia Pty Ltd tel 1 800 629 4852 Australia fax 61 3 9272 0749 Australia tel 0 800 738 378 New Zealand fax 64 4 802 6881 New Zealand Agilent Technologies Hong Kong tel 852 3197 7777 fax 852 2506 9284 You can visit our Web site http www agilent com find assist 40
21. or type for connection to DUT for the power sensor models A torque wrench must be used to tighten these connectors Only use a wrench set to the correct torque value Wrench Size and Torque Values Model Connector Wrench Size Torque Value N1921A Type N male 3 4 inch open end 12 in Ib 135 Nem N1922A 2 4 mm male 5 16 inch open end 8 in Ib 90 Nem Calibration When calibrating a P Series Wideband Power Sensor there is no need to disconnect it from the power source The power meter performs Internal Zero and Calibration routines The process used for this Internal Zero and Calibration is explained in Overview of the P Series Wideband Power Sensors on page 7 The chapter Using P Series Power Sensors in the P Series Power Meter Users Guide explains in more detail the methods used the perform the zero and calibration of the power sensor Figure 1 3 Zero and Cal us On r Path Switching amplifier and Overview of the P Series Wideband Power Sensors The P Series Wideband Power Sensors has two different models The N1921A has a frequency range of 50 MHz to 18 GHz The N1922A has a frequency range of 50 MHz to 40 GHz The 7nternal Zero and Calibration The P Series Wideband Power Sensor s nternal Zero and Calibration process is used to combine the power sensor and power meter to make accurate power measurements Referring to Figurel 3 Simplified Sensor Block Diagram the process for t
22. quirements The P Series Wideband Power Sensors are ONLY compatible with the P Series Power Meters Table 1 1 lists the length of cable option these have no interconnecting cable requirements as the cable is permanently connected hard wired to the P Series Wideband power sensor Cable Length Options Option Description N1921A 105 1 5m 5 ft cable length N1922A 105 N1921A 106 3m 10 ft cable length N1922A 106 N1921A 107 10m 31 ft cable length N1922A 107 Interconnections Connect the cable to the P Series power meter s channel input Figure 1 2 shows that you must align the red dot on the sensor s cable and the meter s connector BEFORE CONNECTING THE POWER SENSOR TO OTHER INSTRUMENTS ensure that all instruments are connected to the protective earth ground Any interruption of the protective earth grounding will cause a potential shock hazard that could result in personal injury Recommended Calibration Interval Agilent Technologies recommends a one year calibration cycle for the P Series power sensors Figure 1 2 NOTE Table 1 2 Connecting a Sensor Cable to a Power Meter Ensure you line up the red dots on the sensor cable and power meter s connector Allow a few seconds for the power meter to read the data contained in the power sensor s EEPROM Ensure power sensor cables are attached and removed in an indoor environment Torque Table 1 2 shows the connect
23. rature compensation 18 Figure 2 3 Percentage error System Level Rise and Fall Time Performance Test The rise and fall time performance of the instrument path must be quantified accurately This test however is more of a system level verification validating the rise and fall time with the N1911 2A using an actual RF pulse Test equipment Signal generator N5182A Power meter N1911 2A Diode detector e Oscilloscope with bandwidth gt 1 GHz Trigger cable U2032A e Wideband power sensor N1921 2A System specification e Rise fall time lt 13 ns error Overshoot lt 5 Measured rise time percentage error versus signal under test rise time 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Signal under test rise time nS Test procedure 1 Turn on the N5182A oscilloscope and N1911 2A 2 Allow the system to warm up for approximately an hour before starting the measurement 19 Figure 2 4 3 Generate an RF pulse signal with the following recommended signal profile from the N5182A Frequency 50 MHz Power level 10 dBm e Pulse period 10 us Duty cycle 50 The pulse signal is characterized using a diode detector which feeds to the oscilloscope This is to verify that the rise fall time of the RF pulse measured by the oscilloscope is 10 ns and its overshoot is 0 596 4 Connect the N1921 2A to the N5182A and N1911 2A as shown in Figure 2 4 System level
24. the standard power Popp of channel A and incident power Pryc 1 of channel B Compute and record the power ratio P ati of these channels for the current frequency and power level based on the following equation Patio B Psrp Pinc1 8 Repeat steps 5 to 7 for other frequencies with the same power level 9 Turn off the RF output of the signal source 10 Remove the standard sensor from the N1912A channel A 11 Connect the device under test DUT N1921 2A to the N1912A channel A 12 The test equipment setup is as shown in Figure 2 2 15 Figure 2 2 Sensor accuracy performance test setup Signal source Incident sensor 13 Zero and calibrate the DUT on the N1912A channel A 14 Repeat steps 5 and 6 15 Measure and record the power readings of channels A and B for the current frequency and power level as Ppyr for channel A and Pinca for channel B 16 Repeat steps 14 and 15 for other frequencies with the same power level 17 Turn off the RF output of the signal source 18 Compute the accuracy error of the DUT for each frequency being measured at the same power level using the following equations Accuracy error dB Pour Pince Psrp Pici Ppur Prc Psrp P inc _ 1 Accuracy error Anti log 70 x 100 19 Compare the computed accuracy errors to the calibration uncertainty values in Table 2 2 and record the accuracy error in Table 2 3 If the test fails refer to Adjustment on page 24 2
25. tions Characteristic specifications are not warranted They describe product performance that is useful in the application of the power sensors by giving typical but non warranted performance parameters These characteristics are shown in italics or denoted as typical nominal or approximate Characteristic information is representative of the product In many cases it may also be supplemental to a warranted specification Characteristic specifications are not verified on all power sensors The types of characteristic specifications can be placed in two groups The first group of characteristic types describes attributes common to all products of a given model or option Examples of characteristics that describe attributes are product weight and 50 Q input Type N connector In these examples product weight is an approximate value and a 50 Q input is nominal These two terms are most widely used when describing a product s attributes 30 The second group of characteristic types describes statistically the aggregate performance of the population of products These characteristics describe the expected behavior of the population of products They do not guarantee the performance of any individual product No measurement uncertainty value is accounted for in the specification These specifications are referred to as typical Conditions The power meter and sensor meet its specifications when Stored for a m
26. ycle 50 Bandwidth HIGH Power level 10 dBm 13 ns Pulse period 2 us Duty cycle 50 Bandwidth HIGH Power level 10 dBm 13 ns Pulse period 10 us Duty cycle 50 Bandwidth OFF Power level 10 dBm 13 ns Pulse period 2 us Duty cycle 5096 Bandwidth OFF Power level 10 dBm 13 ns Pulse period 10 us Duty cycle 50 21 Figure 2 5 Zero Set Performance Test in System Level Zero set is defined as the amount of residual offset error that is present following a zeroing operation This offset error is caused by contamination from several sources including circuit noise This test is a system level verification which requires N1911 2A Test equipment Signal generator E4438C Power meter N1911 2A Agilent USB GPIB interface 82357B GPIB cable e Wideband power sensor N1921 2A PC System specification No RF presence 200 nW RF presence 200 nW frequency gt 500 MHz 550 nW frequency 500 MHz Test procedure 1 Connect the N1921 2A to the N1911 2A 2 Turn on N1911 2A and E4438C 3 Setthe GPIB address of the power meter N1911 2A and the signal generator E4438C to 13 and 19 respectively 4 Connect the N1921 2A to the signal generator as shown in Figure 2 5 Allow the system to warm up for approximately an hour Zero set performance test in system level setup E4438C Power meter 22 Download the Wideband Power Sensor Zero Set Verification Uti
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