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HP 84125A User Manual

Microwave emi measurement test system
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  • Page 1 Agilent Test & Measurement website, www.tm.agilent.com. HP References in this Manual This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-Packard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent Technologies. We have made no changes to this manual copy.
  • Page 2 HP 84125A/B User's Guide Microwave EMI Measurement Test System ABCDE HP Part No. 84125-90011 Printed in USA February 1999...
  • Page 3 Notice The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and tness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
  • Page 4 Certi cation Hewlett-Packard Company certi es that this product met its published speci cations at the time of shipment from the factory. Hewlett-Packard further certi es 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.
  • Page 5 Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packard products. For any assistance, contact your nearest Hewlett-Packard Sales and Service Oce. Compliance This instrument has been designed and tested in accordance with IEC Publication 348, Safety Requirements for Electronic Measuring Apparatus, and has been supplied in a safe condition.
  • Page 6 General Safety Considerations WARNING No operator serviceable parts inside. Refer servicing to quali ed personnel. To prevent electrical shock, do not remove covers. If this instrument is not used as speci ed, the protection provided by the equipment may be impaired. This instrument must be used in a normal condition (in which all means for protection are intact) only.

  • Page 8: Table Of Contents

    Test-Set Components ....Installing the HP 84125A/B System ..Assembling the Test Mobile Instrument Cart ..
  • Page 9 5. System Interface HP 84125A/B System Softkey Reference ..6. Making Measurements Con guring the Test Set ....Setting Up the HP 8593EM EMC Analyzer ..
  • Page 10 7-1. Replaceable Parts ....7-2. HP Sales and Service Oces ... . .

  • Page 12: Product Description

    It provides a system level solution to make measurements above 1 GHz. The HP 84125A/B system is designed to test products for EMI compliance to current FCC regulations governing emissions and has the performance necessary for measuring to current ETSI and CISPR regulations in the same frequency band.

  • Page 13: Measurement Overview

    Measurement Overview The HP 84125A/B microwave EMI measurement test system may be used for a variety of measurements. To assure the best, most accurate measurements of your product, you should read and review the required product regulations. The following is a brief description of how to use the system to test a product to the FCC Part 15 regulation.

  • Page 14: Speci Cations And Characteristics

    HP 84125B 1 to 26.5 GHz HP 8593EM EMC Analyzer Additional instrument speci cations are described in HP 8590 EM Series EMC Analyzer Calibration Guide EMC Analyzer Display Average Noise Level Speci cation Typical (Measured at test-set input with 1 MHz RBW)

  • Page 15: Antenna Speci Cations And Characteristics

    HP part number 0.5 dB 84125-80008 For an HP 84125B only. VSWR (characteristic) 1 to 18 GHz (HP 11966E) 2.8 to 1.0 18 to 26.5 GHz (p/n 84125-80008) 1.4 to 1.0 For an HP 84125B only. Third Order Intercept (characteristic) >...

  • Page 16: Hp 84125A/B System Dimensions

    The weight includes the 1 to 18 GHz antenna horn. For an HP 84125B, with the 18 to 26.5 GHz antenna horn installed, the test-set weight is 7.5 lb or 16.5 kg. Includes EMC analyzer, instrument cart, and test set.

  • Page 17: Typical Sensitivity For An Hp 84125A/B System

    Typical Sensitivity for an HP 84125A/B System Note The values displayed by the HP 84125A/B system are the actual eld strength of the emission (in dB  V/m), corrected for all system gains and losses including the antenna transducer factors.

  • Page 18: Amplitude Accuracy

    HP 84125A/B system. The following conditions must be met to assure the amplitude accuracy of your system. 1. The HP 84125A/B system has been warmed up for 30 minutes or more at a stable temperature between 20 C and 30 2.

  • Page 19: Declaration Of Conformity

    Declaration of Conformity Figure 2-4. Declaration of Conformity 2-6 Speci cations and Characteristics...

  • Page 20: System Setup And Functional Tests

    The following procedure will assist you in setting up your HP 84125A/B system. Initial Inspection Your HP 84125A/B system is sent to you in three shipping containers. Inspect the shipping containers for damage. Use Table 3-1 to verify that the contents are complete. It is important that you retain the shipping containers for returning the system in one year for recalibration.

  • Page 21: Test-Set Components

    Test-Set Components Table 3-1. HP 84125A/B System Accessories Description HP Part Number Comments System Rack Box (largest carton) Testmobile Instrument Cart HP 1182A Shipped assembled except for the handle and casters. The handle and hardware are contained in a carton within the system rack carton.
  • Page 22 Table 3-1. HP 84125A/B System Accessories (continued) Description HP Part Number Comments EMC Analyzer Box (medium-sized carton) Memory Card (RAM) 08591-10008 Blank RAM memory card Memory Card (ROM) 08590-10027 ROM memory card with EMC setups, limit lines, and correction factors...

  • Page 23: Installing The Hp 84125A/B System

    The instrument strap will not be used for this installation. 2. Assemble the casters (that is,wheels) and the cart handle to the cart as shown in the HP 1182A Testmobile Instrument Cart and Accessories Operating Guide. Installing the EMC Analyzer Refer to Figure 3-1 to assist you with the following procedure.
  • Page 24 Figure 3-1. EMC Analyzer Installation b. Slide the rubberized bumpers on the back of the analyzer under the folded tabs on the back of the bracket. c. Lower the front of the analyzer into the bracket so that the front lower bumpers t behind the front tabs of the bracket. 4.

  • Page 25: Attaching The Power Module And Power Cords

    Position the analyzer handle so that it rests against the back of the analyzer. 4. The test-set carton also contains the HP 84125A/B RAM card for the EMC analyzer. Install the RAM card into the memory card slot located underneath the analyzer display. To install the RAM card: a.

  • Page 26: Connecting The Rf Cable Assembly To The Emc Analyzer

    Note Since the system functional tests also require the RF cable assembly to be removed from the INPUT 50 of the analyzer, you may elect to perform the system functional tests at this time. Additional equipment and accessories will be required to perform these tests. Refer to \System Functional Tests"...
  • Page 27 1. Use a #15 torx driver and two 4.0 mm X 12.0 mm torx screws to attach the strain-relief support bracket to the EMC analyzer mounting bracket. Notice that the strain-relief bracket has four holes in the bottom surface. Use the two holes furthest from the strain relief.
  • Page 28 Figure 3-3. Strain Relief Installation System Setup and Functional Tests 3-9...

  • Page 29: Connecting The Dc Ampli Ers To The Rf Cable Assembly

    Connecting the DC Ampli ers to the RF Cable Assembly Refer to Figure 3-4 for the following procedure. Figure 3-4. DC Ampli ers Cable Routing 1. Locate the two DC ampli er cables where they separate from the RF cable assembly. Position the DC ampli er cables so that they loop around the edge of the shelf.

  • Page 30: System Functional Tests

    18 to 26.5 GHz range (that is, HP 84125B only). In this range, a 20 GHz reference point is used. The beginning of this procedure requires the EMC analyzer portion of the system (that is, the test set) is bypassed.

  • Page 31: Recommended Test Equipment And Accessories

    24 inches long Termination, 50 Connector: APC 3.5 (m) HP 909D Frequency Range: 1 to 26.5 GHz Option 12 For use with an HP 84125A only. For use with either an HP 84125A or HP 84125B. 3-12 System Setup and Functional Tests...

  • Page 32: Procedure

    \Calibrating the HP 8593EM EMC Analyzer" in Chapter 6 and perform the frequency and amplitude calibration. When completed, DO NOT reconnect the test set output to the EMC analyzer INPUT 50 . Verify that the HP 8593EM EMC analyzer is in EMC analyzer mode. 4. Press, MODE...
  • Page 33 Note NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN When either the 1GHZ to 18GHZ or 1.5GHZ to 18GHZ softkeys are selected, the EMC analyzer start and stop frequencies will default to 2.68 to 18 GHz. This is normal operation of the EMC analyzer and is due to the internal RF switching paths of the EMC analyzer. Therefore, if the signal of interest is below 2.68 GHz, you must change the start frequency of the analyzer to the desired frequency NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN...

  • Page 34: Displayed Average Noise Level (Danl) Description

    MARKER 1 amplitude in Table 3-4. 18. Repeat steps 5 through 17 for the remaining test frequencies listed in Table 3-4. You can also verify HP 84125A/B system functionality at other frequency points by repeating the above procedure at the frequency point of interest.

  • Page 35: Equipment Required

    Adapter Type N (f) to APC 3.5 (f) 1250-1745 Termination, 50 Connector: APC 3.5 (m) HP 909D Frequency Range: Option 12 1 to 26.5 GHz Procedure: Input 1 to 18 GHz (1 to 2.9 GHz, 2.68 to 18 GHz) 1.
  • Page 36 3. Press NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN 84125A/B PRESET , CONT , SELECT CONFIG . 4. Press NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN 1 GHZ to 18 GHZ to select the 1 to 18 GHz con guration. Ensure that the test set hardware is correct for the con guration selected.

  • Page 37: Input 18 To 26.5 Ghz (For An Hp 84125B Only)

    Input 18 to 26.5 GHz (For an HP 84125B only) 1. Connect equipment as shown in Figure 3-8. Figure 3-8. DANL Measurement Setup, 18 to 26.5 GHz 2. Press NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN and verify that EMC ANALYZER is underlined. If not, MODE...
  • Page 38 (GHz) (GHz) (dBm) (dB) (dB) 1 to 18 1.5 to 18 3.5 to 18 8.25 to 18 18 to 26.5 For an HP 84125B only. Table 3-5. Displayed Average Noise Level Frequency Marker Marker Limit Range Frequency Amplitude (GHz) (GHz) 1 to 2.9 GHz...

  • Page 40: Test Set Hardware Con Gurations

    This chapter describes how to set up and con gure your test set with the appropriate antenna and lters needed to make measurements over the entire frequency range of the HP 84125A/B system. When making measurements from 1 to 18 GHz, a high-pass lter can be installed.
  • Page 41 1. Attach the antenna (HP 11966E) to the front plate. Position the antenna so that the Type N connector on the test set is pointing to the right of the test set as viewed from the front. Use the 1/4 inch at washer, the split lock washer, and the 1/4-20 hex nut supplied in the accessories box, to attach the antenna.
  • Page 42 Position the lter or through cable in the space provided in front of the lter clamp. Push the lter clamp toward the lter while keeping the lter within the recessed area of the antenna mounting plate. When the lter is properly positioned, tighten the thumb clamp screw to secure the lter.

  • Page 43: To 26.5 Ghz Con Guration (For The Hp 84125B Only)

    18 to 26.5 GHz Con guration (For the HP 84125B only) Note If an antenna is already installed, you may need to remove the antenna and any associated cables or lters before installing another antenna. When performing the following antenna installation, only nger tighten connectors keeping all connections loose until the last step.

  • Page 44: Cable And Connector Care

    Connection Procedure 1. Visually inspect the connectors. 2. If necessary, clean the connectors. Use a 99.5% Isopropyl Alcohol solution (HP part number 8500-5344). 3. Carefully align the connectors. The male connector center pin must slip concentrically into the contact ngers of the female connector.

  • Page 45: Disconnection Procedure

    At this point all you want is a connection in which the outer conductors make gentle contact at all points on both mating surfaces. Very light nger pressure (no more than 2 inch{pounds of torque) is enough. 6. Torque nal connections to 8-inch lbs. Disconnection Procedure 1.

  • Page 46: System Interface

    Access the HP 84125A/B system softkeys by pressing the key. MODE There are two ways to access the HP 84125A/B system main menu: accesses the HP 84125A/B system main menu softkeys HP4125A/B and maintains the current settings of both the EMC MAIN MENU analyzer and HP 84125A/B system.
  • Page 47 EMC analyzer settings are automatically loaded. The functionality of the HP 84125A/B system softkeys is described below. Note When correction data is loaded and turned on, the letter \A" and the word \CORR"...
  • Page 48 EMC analyzer settings for making an EMI measurement. For an HP 84125B only Note The 18 to 26.5 GHz waveguide horn antenna serves as a high-pass lter providing high rejection to fundamental frequencies below 18 GHz.

  • Page 50: Making Measurements

    Making Measurements The HP 84125A/B microwave EMI measurement test system may be used for a variety of measurements. To assure the best, most accurate measurements of your product, you should read and review the required product regulations. The following example describes one method for measuring the intentional radiation of a cellular telephone in accordance with the current FCC, Part 15 regulation.

  • Page 51: Con Guring The Test Set

    Refer to Figure 4-2 to assist you with this procedure. Note For an HP 84125B system, make sure that the 1 to 18 GHz antenna (HP 11966E) is installed in the test set. Refer to Chapter 4 to assist you with this procedure.

  • Page 52: Setting Up The Hp 8593Em Emc Analyzer

    Make sure that the cellular telephone is on. To streamline your measurement process, place the EUT on a nonconductive turntable and position the test set on an HP 11968C tripod. Rotate the EUT instead of the test set to nd the worst case emissions.

  • Page 53: Making A Measurement Using Average Detection

    Ensure that the appropriate printer or plotter is connected and con gured. For more information, refer to the HP 8590 EM-Series EMC Analyzer User's Guide . Making a Measurement Using Average Detection 1. To make a measurement using average detection, the frequency span must be reduced around the signal to be measured.

  • Page 54: Calibrating The Hp 8593Em Emc Analyzer

    (corrected) appears on the left side of the screen. Warm-up time In order for the HP 8593EM EMC analyzer to meet its speci cations, allow the EMC analyzer to warm up for 30 minutes after being turned on, before attempting to make any calibrated measurements. Be sure to calibrate the EMC analyzer only after it has met operating temperature conditions.

  • Page 55: Preparing The Hp 8593Em Emc Analyzer For Calibration

    Preparing the HP 8593EM EMC Analyzer for Calibration To prepare the EMC analyzer for calibration, the bracket assembly that secures the harness cable assembly to the EMC analyzer must rst be removed. To remove the harness cable assembly from the EMC analyzer: 1.
  • Page 56 Note NNNNNNNNNNNNNNNNNNNNNNNNNN To interrupt the calibration routines started by CAL FREQ , NNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN CAL AMPTD , or CAL FREQ & AMPTD , press PRESET NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNN More 1 of 4 , and CAL FETCH . CAL FETCH retrieves the previous correction factors.

  • Page 57: Performing The Ytf Self-Calibration Routine

    Refer to \When Is Self-Calibration Needed?" in the following section for some helpful guidelines on how often the self-calibration routines should be performed. 1. Connect a low-loss cable (such as HP part number 8120-5148) from 100 MHz COMB OUT to the EMC analyzer input. 2. To calibrate, press:...
  • Page 58 3. To achieve optimal amplitude accuracy for relative measurements: a. Keep the EMC analyzer in a stable environment. b. Use NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN CAL FREQ & AMPTD before beginning the rst measurement. c. Keep the EMC analyzer turned on between measurements. d. Do not use NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN CAL FREQ &...

  • Page 60: Customer Support

    Return the FAX Cover Sheet A FAX sheet is provided at the end of this chapter as a method in which to directly contact the HP EMC support team in the event of a problem. The FAX cover sheet provides the EMC support team with information about your company, the product, and a detailed description about the problem.

  • Page 61: Calibration Information

    Changing the memory card battery Note The battery will be replaced in the RAM card when the HP 84125A/B system is sent back to Hewlett-Packard for the recommended yearly calibration. In this case, you will not need to replace the battery.

  • Page 62: Procedure To Change The Memory Card Battery

    Figure 7-1. Memory Card Battery Date Code Location Procedure to change the memory card battery The battery is located beside the card's write-protect switch on the end opposite the connector. CAUTION The battery power enables the memory card's memory to retain data. You can lose the data when the battery is removed.

  • Page 63: Replaceable Parts

    Clamp Thumb Screw 0515-2212 RF Cable, semirigid 84125-20041 RF Cable, semirigid 84125-20042 RF Cable, semirigid 84125-20043 RF Cable, semirigid (for an HP 84125B only) 84125-20044 RF Cable, semirigid 84125-20045 RF Cable, semirigid 84125-20019 RF Cable, assembly 84125-60002 Adapter, SMA (m) to (m) 1250-1159 Adapter, 2.4 mm (f) to (f)

  • Page 64: Returning The Hp 84125A/B System For Calibration Or Service

    Use the following steps to package the HP 84125A/B system for shipment to Hewlett-Packard for calibration or service: 1. If the HP 84125A/B system is being sent in for repair, include the following information: Any speci c information regarding the nature of the problem.

  • Page 65: Hewlett-Packard Sales And Service OCes

    CAUTION Damage to the HP 84125A/B system can result from using packaging materials other than those speci ed. Never use styrene pellets in any shape as packaging materials. They do not adequately cushion the instrument or prevent it from shifting in the carton. Styrene pellets cause equipment damage by generating static electricity and by lodging in the fan.
  • Page 66 Table 7-2. HP Sales and Service Oces US Field Operation Headquarters Georgia Hewlett-Packard Company Hewlett-Packard Company 19320 Pruneridge Avenue 2000 South Park Place Cupertino, CA 95014 USA Atlanta, GA 30339 (800) 752-0900 (404) 955-1500 Southern California Illinois Hewlett-Packard Company Hewlett-Packard Company...
  • Page 67 7-8 Customer Support...

  • Page 68: Amplitude Accuracy

    Amplitude Accuracy The amplitude accuracy of the HP 84125A/B system is a combination of the accuracy of the measuring receiver and the accuracy of the test set including the RF cable assembly. In general, the amplitude error is calculated by: [EMC Analyzer Uncertainty] + [Test-Set Uncertainty] + [Temperature Drift*]= Total Uncertainty *Where temperature drift is the maximum speci ed test set temperature drift.

  • Page 69: Hp 84125A/B Test-Set Uncertainties

    Test-set maximum temperature drift uncertainty is a maximum amplitude error that will occur due to temperature drift. This error is valid when the HP 84125A/B system is used in an ambient temperature range of 20 C to 30 To calculate the total amplitude uncertainty, the individual uncertainties described above must be combined.
  • Page 70 More 1 of 4 , CORRECT ON OFF with OFF underlined). The measurement uncertainties are found in HP 8590 EM Series EMC Analyzer Calibration Guide . The measurement uncertainties for the EMC analyzer using the instrument settings above are: Calibrator uncertainty: 0.4 dB...
  • Page 71 Receiver Scale EMC analyzer 3 sigma normal 0.42 dB 0.14 dB Fidelity Uncertainty speci cations speci cation HP 84125A/B Test Set and System Uncertainties Antenna Factor HP 84125A/B speci cation assumed 2.0 dB 1.16 dB Uncertainty speci cations uniform Antenna to Test Set...
  • Page 72 2*(2.43) + 1.5 = 6.36 dB This is the total amplitude uncertainty in the measured eld strength of the HP 84125A/B system for these measurement settings. The uncertainty for each set of measurement conditions must be calculated separately. It is recommended that you follow the procedure in NAMAS, Publication NIS 81 for a complete understanding of your measurement uncertainties.
  • Page 74 Index 1 - 18 GHz test set con guration, 4-1 18 - 26.5 GHz test set con guration, 4-4 3.5 mm connecting, 4-5 analyzer calibration, 6-5 antenna, installing, 4-1 antenna speci cations and characteristics, 2-2 battery changing the battery, 7-2 cable care, 4-5 CAL, 6-5 CAL AMPTD, 6-7 CAL FETCH, 6-7...
  • Page 75 DLP, 7-2 operation veri cation, 3-11 packaging information, 7-5 parts list, replaceable, 7-4 product description, 1-1 regulatory information, 2-6 reloading the DLP, 7-2 repairing, system, 7-6 replaceable parts, 7-4 returning for repair, 7-6 returning the system, 7-5 returning to HP, 7-5 Index-2...
  • Page 76 6-5{8 service oces, HP, 7-6 service, returning for, 7-5 setting up the system, 3-1 shipping the system, 7-5 softkeys, system, 5-1 speci cations, 2-1 storage, 4-6 system calibration, 7-2 characteristics, 2-1 components list, 3-2 description, 1-1 DLP, 5-1 functional test, 3-11...

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