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HP 85325A Operating And Service Manual
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HP 85325A Operating And Service Manual

HP 85325A Operating And Service Manual

R/q/u/v/w millimeter subsystem, millimeter-wave interface kit
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HP 85325A R/Q/U/V/W Millimeter Subsystem
HP 85326A Millimeter-Wave Interface Kit
Operating and Service Manual

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  • Page 1 HP 85325A R/Q/U/V/W Millimeter Subsystem HP 85326A Millimeter-Wave Interface Kit Operating and Service Manual...
  • Page 3 HP 85325A R/Q/U/V/W Millimeter Subsystem HP 85326A Millimeter-Wave Interface Kit Operating and Service Manual HP part number: 85325-90061 Printed in USA 08 December 1998 Edition 2.0...
  • Page 4 (c)(1) and (c)(2) of the Commercial Computer Software Restricted Rights clause at FAR 52.227-19 for other agencies. Hewlett-Packard Company Santa Rosa Systems Division 1400 Fountaingrove Parkway Santa Rosa, CA 95403-1799, U.S.A. © Copyright Hewlett-Packard Company 1998 iv HP 85325A Operating and Service Manual...
  • Page 5 • Chapter 4 Performance Verification • Chapter 5 Timebase Check and Adjustment • Chapter 6 Service • Appendix A Using the HP 8340/41 in Your System • Appendix B Connecting the Waveguide Properly HP 85325A Operating and Service Manual v...
  • Page 6 Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP from another country. HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument.
  • Page 7 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). HP 85325A Operating and Service Manual vii...
  • Page 8 Any adjustment, maintenance, or repair of this product must be performed by qualified personnel. Contact your customer engineer through your local HP Service Center. You can find a list of HP Service Centers on the web at http://www.hp.com/go/tmdir If you do not have access to the Internet, one of these HP centers can direct...
  • Page 9 This text indicates that the instrument is an Industrial Scientific and Medical Group 1 Class A product (CISPER 11, Clause 4). This symbol indicates that the power line switch is ON. This symbol indicates that the power line switch is OFF or in STANDBY position. HP 85325A Operating and Service Manual ix...
  • Page 10 If this product is to be powered by autotransformer, make sure the common terminal is connected to the neutral (grounded) side of the ac power supply. x HP 85325A Operating and Service Manual...

  • Page 11: Declaration Of Conformity

    Einhaltung der Bestimmungen eingerumt. Zustzinformation fr Mess-und Testgerte: Werden Mess- und Testgerte mit ungeschirmten Kabeln und/oder in offenen Messaufbauten verwendet, so ist vom Betreiber sicherzustellen, dass die Funk-Entst"rbestimmungen unter Betriebsbedingungen an seiner Grund- stcksgrenze eingehalten werden. HP 85325A Operating and Service Manual xi...
  • Page 12 Typeface Conventions • Italics Used to emphasize important information: Use this software only with the HP xxxxxX system. • Used for the title of a publication: Refer to the HP xxxxxX System-Level User’s Guide. • Used to indicate a variable: Type filename.

  • Page 13: Table Of Contents

    Figure 1-1. Initial Setup ....... . . 1-3 Using an HP 8340/41 RF Source ......1-3 Connecting the Waveguide .
  • Page 14 Starting The Program ........4-11 Contents-ii HP 85325A Operating and Service Manual...
  • Page 15 The Purpose of Each Device in the Transmitter Section ..6-3 Allowable HP-IB Cable Lengths ......6-3 Extender Recommendations .
  • Page 16 Using the HP 8340/41 in Your System Figure A-1. HP 8340/41 RF Source ......A-1 Connecting the Waveguide Properly Handling and Storing .

  • Page 17: Installation

    WEB site: www.ansi.org CAUTION Do not connect LO power to the HP 11970 mixers until you adjust the LO power in “Mixer LO Power Level Adjustment” on page 1-8. If you connect LO power before adjusting it you could permanently damage the mixers.

  • Page 18: Required Equipment

    8710-1623 (supplied with HP 85326A) 1/4 inch Wrench 8710-0510 (supplied with HP 85325A) 3/16 inch Wrench 8710-0013 (supplied with HP 85325A) 3/32 Hex Ball Driver 8710-1539 (supplied with HP 85325A) Adapter, 3.5 mm (f) to (f) 1250-1749 1-2 HP 85325A Operating and Service Manual...

  • Page 19: Initial Setup

    RF source so it will accept mm-wave band start and stop frequency commands from the receiver. Using an HP 8340/41 If you are using an HP 8340/41 as an RF source, refer to Appendix A for setup information. RF Source Connecting the When connecting the waveguide, refer to Appendix B, “Connecting the...

  • Page 20: Optional 10 Mhz Reference Connection

    This procedure assumes at least one source has a front panel. Procedure 1. Set up the sources so that they are not under HP 8530 control. 2. Connect the 10 MHz cable between the LO and RF source 10 MHz REF jacks.

  • Page 21: Receiver Settings

    {Braces} Setting Up the 1. Turn ON the RF source. Make sure it is set to HP-IB address 19. Receiver 2. Turn ON the LO source. Make sure it is set to HP-IB address 18.
  • Page 22 10. Press and do one of the following: {MULTIPLIER DENOM.} a. If source 1 (the RF source) is an HP 836xx, and the source interface cable is connected: press [1] [x1] b. If source 1 is an HP 836xx and the source interface cable is not connected, enter the DENOM.

  • Page 23: Table 1-3. Multiplier Denom Table

    Installation Receiver Settings c. If source 1 is an HP 8340/41, enter the DENOM value (in Table 1-2 on page 1-6) for your band. Terminate with [x1] 11. Press: {OFFSET FREQUENCY} [0] [x1] {DONE} 12. Press: {DEFINE: SOURCE #2} {MULTIPLIER NUMER.} [1] [x1] 13.

  • Page 24: Mixer Lo Power Level Adjustment

    [Brackets] indicate a display softkey selection. {Braces} CAUTION It is critical that you set LO power before connecting the HP 11970 mixers. Initial Setup 1. If using an HP 8530A, press: https://tracking.spaoa.org {FREQUENCY} 2. Place the receiver in the single point (CW) mode by pressing:...

  • Page 25: How To Use The Chart

    3 dB 1. Assumes use of HP 85381A cable type. 2. A standard HP 85325A system uses 8, 6, or 4 meter cables. How to Use the Chart Determine the length of the LO cable that goes from the HP 85309A REF LO OUT connector to the reference module's LO IN connector.

  • Page 26: Figure 1-2. Reference Attenuator Installation

    (8 to 10 in-lbs of torque is recommended). 8. Replace the module covers and screws. Tighten the screws until they are snug. Do not over-tighten. Figure 1-2 Reference Attenuator Installation Figure 1-3 Test Attenuator Installation 1-10 HP 85325A Operating and Service Manual...

  • Page 27: Adjustment Procedures

    LO power must be adjusted before connecting the HP 85325A mixers to avoid damaging them. Use Procedure 1 or 2, as appropriate: • Procedure 1 Use this procedure if you are only going to use the HP 85325A/HP 85325A mixer configuration. • Procedure 2 Use this procedure if you are going to reconfigure your system between...
  • Page 28 17 and 17.8 dBm. The “LO POWER OUT OF RANGE” light should be off. 2. Note the reading of the HP 85309A display and write it down here: HP 85326A DETECTOR VOLTAGE SETTING:______________ millivolts If the LO power adjust setting is ever changed, you can return to the appropriate power level for the millimeter system by referring to this setting.

  • Page 29: Figure 1-6. Lo Power Measurement Point For Test Module

    Use various combinations of the 1, 2, and 4 dB attenuators to adjust the LO power to the required range. 4. If you have more than one test module, repeat power measurement for each test channel module as explained above. HP 85325A Operating and Service Manual 1-13...

  • Page 30: Procedure 2

    3. Determine the power sensor calibration factor at 4 GHz, and set the power meter accordingly. 4. Connect the power sensor to the LO output of the HP 85326A reference module (refer to Figure 1-4 on page 1-11). Be sure to connect the power sensor to the end of the LO cable.
  • Page 31 HP 85325A mixers and your other mixers without readjusting LO power each time. Perform “Procedure 1" on page 1-11 to adjust LO power for the HP 85325A mixers. To adjust LO power for the other mixers, refer to the operating manual for those mixers.

  • Page 32: Mixer Operational Check

    [REF VALUE] 7. Write down the reference value, you will need it later in this procedure: REF VALUE = ____________________________ 8. Set display scale to 1 dB/division, press: [SCALE] [1] [x1] 1-16 HP 85325A Operating and Service Manual...
  • Page 33 Mixer Operational Check 9. Make sure the signal is at anticipated levels. The coupled arm attenuates the output of the HP 8355xA by 30 dB (this can vary depending on the type of coupler used). Power flatness should be approximately +/-3 dB across the band.

  • Page 34: When Using An Hp 8350 Lo Source

    Mixer Operational Check 13. Determine which receiver input has the test signal connected to it (b1, b2, or a2). 14. Measure that input using the USER softkeys (on HP 8510) or SERVICE PARAMETER softkeys (on HP 8530). 15. Press: [DISPLAY]...

  • Page 35: Saving The Setup

    {Braces} Press to save the current instrument setup. Whenever [SAVE] {USER PRESET 8} you press or turn the receiver on, the proper settings for this [USER PRESET] system will be recalled. HP 85325A Operating and Service Manual 1-19...

  • Page 36: Final Installation

    LO power occurs then both millimeter-wave mixers may be destroyed. Do not connect LO power to the HP 11970 mixers until you adjust the LO power. Refer to the “Mixer LO Power Level Adjustment” on page 1-8 If you connect LO power before adjusting it you could permanently damage the mixers.
  • Page 37 If you are using a radiated reference, connect as shown in Figure 1-11 on page 1-23. Refer to Figure 1-1 on page 1-3 for system-level connections. Figure 1-9 HP 85325A/85326A Installation Block Diagram (Coupled Reference) HP 85325A Operating and Service Manual 1-21...
  • Page 38 Installation Final Installation Figure 1-10 HP 85325A/85326A Visual Installation Diagram (Coupled Reference) 1-22 HP 85325A Operating and Service Manual...

  • Page 39: If Using An Hp 8340/41 Rf Source

    Final Installation Figure 1-11 HP 85325A/85326A Installation Block Diagram (Radiated Reference) If Using an HP 8340/41 If you are using an HP 8340/41 as an RF source, refer to Appendix A for setup information. RF Source Connecting the When connecting a waveguide, refer to Appendix B, “Connecting the Waveguide Properly.”...

  • Page 40: Proper Torque For Coax Connections

    Turn ON AC Power Turn ON the AC power for all of the components in the following order: 1. RF and LO sources, RF power amplifier 2. HP 85309A LO/IF unit 3. Receiver 1-24 HP 85325A Operating and Service Manual...

  • Page 41: Operation

    This will minimize the danger of an electrostatic discharge damaging the mixers. NOTE The HP 85325 millimeter wave system is designed to be used with a HP 85310A or HP 85301B. Refer to these instrument manuals for system level operating information.

  • Page 42: Mixer Operating Parameters

    No greater than +20 dBm Power Required LO Power The HP 11970 mixers require +14 to +18 dBm at the LO input. Connector Care Leave the plastic waveguide flange cap on whenever the system waveguide connectors are not connected together. This protects the mating surface from scratches, which can degrade performance.

  • Page 43: General Information

    • Maximum Cable Lengths Product Description The HP 85325A millimeter subsystem is designed for use with the HP 85309A distributed frequency converter. The subsystem (in conjunction with the transmit RF source, source amplifier, and HP 85309A) downconverts mm-wave frequencies to a 20 MHz IF signal. This IF signal is required by the HP 8510 or HP 8530 receiver.

  • Page 44: Specifications

    General Information Specifications Specifications • About Specifications All millimeter bands are specified with HP 11970 harmonic mixers. • Sensitivity is defined as signal equals noise. Averaging will improve sensitivity by 10 log x (averaging factor). • Channel isolation is the coherent RF leakage from the reference mixer to the test mixer with inputs terminated.

  • Page 45: Table 3-2. V And W Band System Level Specifications

    Dynamic Range (dB) (0 averages) (68 typical) (62 typical) Compression Lvl (dBm) (at 0.1 dB) Channel Isolation (dB) -100 -100 (reference to test) Typical Match (dB) 1. At the input of test and reference isolators. HP 85325A Operating and Service Manual 3-3...

  • Page 46: Mm-Wave Source And Mixer Characteristics

    MM-Wave Source and Mixer Characteristics MM-Wave Source and Mixer Characteristics The following tables identify the INPUT and OUTPUT characteristics of the HP 8355xA series millimeter-wave sources and HP 11970x mixers. Table 3-3 MM-Wave Source Information MM Source Model # Output Frequency MM-Wave Output...

  • Page 47: Supplied Equipment

    General Information Supplied Equipment Supplied Equipment The following items are supplied with the HP x85325A and the HP 85326A. Table 3-5 Supplied Parts Description Standard Option 001 Option 002 Model or Part Quantity Quantity Quantity Number With the HP x85325A:...

  • Page 48: Maximum Rf Cable Lengths

    Maximum RF Cable Lengths In millimeter-wave systems, there is a length limit on the HP 85381A LO cable that goes from the LO source to the LO INPUT of the HP 85309A (L and the L cable (the cable that goes between the REF LO OUT of the HP 85309A and the LO IN on the reference module).

  • Page 49: Formulas For Cable Length Maximums

    NOTE Test and reference cables must be the same length. The output LO power of the HP 85309A is normally greater than +20.8 dBm between 3 and 6 GHz. The mixers require a nominal +16 dBm (+14 dBm minimum). The difference between these two LO power levels (+ 20.8 dBm and +16 dBm) determines the maximum loss of the test and reference path.
  • Page 50 If using an HP 85381A type cable, the length should not exceed 5 meters. CAUTION The damage level for the HP 11970x mixer is +20 dBm. This can occur if the ALC loop is broken and the proper setup procedure was not used for the HP 85325A internal attenuator values.

  • Page 51: System Performance Verification

    To determine the recommended equipment for testing each of the millimeter wave system instruments, refer to the manual for that instrument. HP 85325A Operating and Service Manual 4-1...

  • Page 52: Non-Banded Equipment

    1. Located in the HP 85310A manual. 2. Not all antenna test systems will use an amplifier. 3. Requires HP BASIC revision 6.0 or higher with 3 Mbytes of RAM memory. 4. A hard disk with one 3.5inch floppy disk may be used.

  • Page 53: Band-Dependent Equipment

    R band: HP R752C Q band: HP Q752C U band: HP U752C V band: HP V752C W band: HP W752C 1. You must have a fixed termination for each test channel of your system HP 85325A Operating and Service Manual 4-3...

  • Page 54: Transmitter Performance Verification

    CW Frequency Accuracy Checks the frequency accuracy of the transmitter source. The Self Test performs the HP 8360 series full self test. Maximum Leveled Power Ensures that the RF source and the optional amplifier produce the specified leveled power.

  • Page 55: Receiver Performance Verification

    Noise and RF to IF Conversion measurements from the first section.This is a specified system performance parameter. Crosstalk Results Calculates the actual crosstalk between all channels using Crosstalk and RF to IF Conversion measurements from the first section. This is a specified system performance parameter. HP 85325A Operating and Service Manual 4-5...
  • Page 56 Calculates the dynamic range of the system using Compression, IF Noise, and RF to IF Conversion measurements from the first section. This is a specified system performance parameter. See “Detailed Test Description” on page 4-15 for additional information. 4-6 HP 85325A Operating and Service Manual...

  • Page 57: Setting Up The Equipment

    Setting Up The Equipment Setting Up The Equipment Procedure 1. Be sure that the correct HP BASIC operating system, drivers, and language extensions are loaded into the computer controller. 2. The receiver, LO/IF unit, mixers, LO source, and cables should be in the same configuration in which they are normally used.

  • Page 58: Figure 4-1. Initial Equipment Configuration

    In this case the mixers should be connected to the verification system with a backup set of HP 85381 cables of the same type and length as the cables normally used in the system.

  • Page 59: Table 4-4. Switch Positions For Analyzer Mode

    System Performance Verification Setting Up The Equipment 5. Make sure the HP 8360's languageswitches are set to the Analyzer Mode shown in Table 4-4. The HP 8360A will not work with your antenna measurement system while set to the TMSL mode.

  • Page 60: Install The Performance Verification Software Onto A Hard Disk

    Onto a Hard Disk The Performance Verification Software (p/n 85325-60001) is not shipped with the HP 85325A or the HP 85326A; however, this software can be ordered through your local sales and service office. See the Service and Support listing on page -viii in the front of the manual.

  • Page 61: Starting The Program

    Performance Verification Software Onto a Hard Disk” on page 10 then continue with the following procedure. Loading the Program 1. Turn on the computer and load HP BASIC. From a Hard Disk 2. Type, '(or an appropriate hard drive location) and MSI “ANT_PERF_VER:,700,0”...

  • Page 62: Running The Tests

    3. There is an option in the System Configuration Test window which allows you to print the data automatically after each test. Keep this data to document your test records. 4-12 HP 85325A Operating and Service Manual...

  • Page 63: Helpful Hints

    LO output. All attenuators should remain inside the test module housing. CW Frequency If you are using an HP 8360 series synthesizer as the LO source and the Accuracy Test timebase of the LO source, RF source, and receiver are not connected together, make sure you have performed the procedure in Chapter 5, “Synthesized LO Source Timebase Check and Adjustment”.
  • Page 64 NOTE When all tests and frequency bands are tested, you can archive the data on the hard disk by copying the test and data subdirectory onto a backup subdirectory. 4-14 HP 85325A Operating and Service Manual...

  • Page 65: Detailed Test Description

    Afterward, the self tests verify that Accuracy Test the internal hardware is maintaining frequency accuracy over the full frequency range. For greatest frequency accuracy, the HP 8360 family of synthesizers should be plugged in to an AC power outlet for 30 days. NOTE If the synthesizer is disconnected from AC power for more than 24 hours, the built-in timebase cools (and loses stability).

  • Page 66: Compression

    The data is then normalized to give a 0 dB reference, Next, the input level is increased until the normalized data changes by 0.1 dB. The test mixer power level is the 0.1 dB compression point. 4-16 HP 85325A Operating and Service Manual...

  • Page 67: Synthesized Lo Source Timebase Check And Adjustment

    Table 5-1 shows the required adjustment interval to maintain a given accuracy. If you know the aging rate, you can determine a more precise adjustment interval. See the HP 8360 series synthesizer service manual for more information. Table 5-1...
  • Page 68 (At instrument preset the synthesizers automatically choose the external standard as the reference if one is connected to the 10 MHz REF INPUT.) 2. On the oscilloscope, set: Channel 1: Display Volts/Division 200 mV Coupling Impedance 50 ohm Channel 2: Display 5-2 HP 85325A Operating and Service Manual...

  • Page 69: Figure 5-2. 10 Mhz Standard Adjustment Location

    4. Using a non-metallic tool, adjust the LO source's A23 10 MHz standard (see Figure 5-2) for minimum horizontal movement of the oscilloscope waveform. Figure 5-2 10 MHz Standard Adjustment Location HP 85325A Operating and Service Manual 5-3...
  • Page 70 Synthesized LO Source Timebase Check and Adjustment 5-4 HP 85325A Operating and Service Manual...

  • Page 71: Service

    This chapter explains how to find and correct malfunctions in the millimeter-wave system. This chapter covers the following topics: • Theory of Operation • Recommended Test Equipment • Receiver Troubleshooting • Replaceable Parts • Adjustments HP 85325A Operating and Service Manual 6-1...

  • Page 72: Theory Of Operation

    Service Theory of Operation Theory of Operation A millimeter wave antenna measurement system (which uses an HP 85309A frequency converter) consists of a transmitter and receiver section. Figure 6-1 shows the block diagram of the antenna measurement system. Figure 6-1...

  • Page 73: Transmitter Section

    Allowable HP-IB Cable Lengths You are allowed 2 meters of cable length for each instrument that is connected to the main HP-IB bus (or to the system bus). A typical system has a computer, printer (or plotter), receiver, and positioner-controller connected to the main HP-IB bus (four devices).

  • Page 74: Extender Recommendations

    If using high speed “TURBO” (fast CW) modes, use fiber optic extenders for distances greater than 250 meters. Using coax at distances over 250 meters greatly slows the whole HP-IB bus. This slows the data transfer to the system computer which results in slow measurements.

  • Page 75: Receiver

    RF frequencies to a lower IF frequency. The LO signal is amplified by the HP 85309A LO/IF unit, which then splits the LO signal and routes it to both mixer modules. The LO source is controlled by the receiver using the system bus.

  • Page 76: Recommended Test Equipment

    Critical Specification shown in Table 6-1 on page 7 and Table 6-2 on page 8. “No substitute” means you must use the listed device. Miscellaneous adapters and cables are also required, and may not be listed in the tables. 6-6 HP 85325A Operating and Service Manual...

  • Page 77: Non-Banded Equipment

    No substitute HP 9000 series 300 Floppy Disk Drive Double-sided high density HP 9122D Power Meter No substitute HP 436A, 437B, (for R, Q, or W IP, T bands) Power Sensor No substitute HP 8485A or 8481A I, P, T Connector Adapters type-N and 3.5 mm...

  • Page 78: Band-Dependent Equipment

    1. I=installation; O = operation; P = performance verification; T = troubleshooting and repair 2. You must have one of these devices for each mm-wave band 3. Where x stands for the band R, Q, U, V, or W. 6-8 HP 85325A Operating and Service Manual...

  • Page 79: Troubleshooting

    Service Troubleshooting Troubleshooting To troubleshoot the mmW system, refer to the Service chapter of the HP 85310A Distributed Frequency Converter Operating and Service Manual. Special 5/16 Inch A specially-modified 5/16 wrench is supplied with this product. The “closed” end has been machined to be smaller, and has been slotted so it will Wrench fit over a cable.

  • Page 80: Replaceable Parts

    Replaceable Parts Replaceable Parts Ordering Information To order a part, contact the nearest Hewlett-Packard office (See “Service and Support” on page viii.), or you can find a list of HP Service Centers on the web at http://www.hp.com/go/tmdir How to Order Parts If you need to order a replacement part, contact you nearest Hewlett-Packard representative.

  • Page 81: Test Module

    The diplexer has a dot on its case. This dot is next to the diplexer's LO port. When you install the new diplexer, make sure the end with the dot is connected to the cable that goes to the LO OUT bulkhead connector. HP 85325A Operating and Service Manual 6-11...

  • Page 82: Reference Module

    J1, J2, J3 Connector, RF type-N 08340-60221 J4, J5 Connector, 3.5 mm bulkhead 5062-6618 Cable, IF through 85325-20006 Cable, detector voltage 85325-60004 Cable, reformable 85325-20004 Cable, LO out 85325-20005 Figure 6-3 HP 85356A (85326-60002) 6-12 HP 85325A Operating and Service Manual...

  • Page 83: Band-Related Parts

    Repairing a Mixer or Source Module The mm source module and mixers can be repaired rather than replaced. Contact your nearest HP service center for instructions on returning a unit for repair. These items are not field-serviceable. HP 85325A Operating and Service Manual 6-13...

  • Page 84: Miscellaneous Parts

    Adjustments Only the HP 85309A LO/IF unit requires periodic circuitry adjustments. Refer to the HP 85310A or HP 85301B Operating and Service Manual for HP 85309A adjustment procedures. If the LO and RF source's timebases are not connected together, refer to either of the manuals (mentioned above) for adjustment instructions.

  • Page 85: Using The Hp 8340/41 In Your System

    Using the HP 8340/41 in Your System Using the HP 8340/41 in Your System Connect an HP 8340/41 RF source as shown in Figure A-1. Figure A-1 HP 8340/41 RF Source HP 85325A Operating and Service Manual A-1...
  • Page 86 Using the HP 8340/41 in Your System A-2 HP 85325A Operating and Service Manual...

  • Page 87: Connecting The Waveguide Properly

    A damaged mating surface can damage any good surface connected to it. If necessary, clean all mating surfaces using alcohol and a lint-free swab or cloth. HP 85325A Operating and Service Manual B-1...

  • Page 88: Precision Flanges

    If you wish to connect two precision flanges, refer to ““Aligning Two Precision Flanges” on page 3.” If you wish to connect a precision flange to a non-precision flange, refer to ““Aligning Precision and Non-Precision Flanges” on page 5” B-2 HP 85325A Operating and Service Manual...

  • Page 89: Aligning Two Precision Flanges

    4. Insert the remaining two screws. 5. Place a lock washer and nut on each screw, and finger tighten. 6. If necessary, remove the alignment pins. 7. Go to ““Tighten Flange Connections” on page 4.” HP 85325A Operating and Service Manual B-3...
  • Page 90 flanges, and the waveguide walls are flush (there is no step or offset). 12. Make sure that all four screws are equally torqued. NOTE Remember the most common cause of measurement error is a poor connection. B-4 HP 85325A Operating and Service Manual...

  • Page 91: Aligning Precision And Non-Precision Flanges

    5. Place a lock washer and nut on each screw and finger tighten. Tighten Flange 6. In an X pattern (for equal compression), tighten all four screws (see Connections figure below). Do not over-tighten. Figure B-6 Tighten Screws HP 85325A Operating and Service Manual B-5...
  • Page 92 flanges, and the waveguide walls are flush (there is no step or offset). 9. Make sure that all four screws are equally torqued. NOTE Remember the most common cause of measurement error is a poor connection. B-6 HP 85325A Operating and Service Manual...
  • Page 93 1-6 formulas for maximum lengths, 3-7 HP-IB address of LO source, 1-5 length of LO cable from HP 85309A to reference module, 1-9 Ls, Lr, Lt, 3-6 calculating system bus cable lengths, 6-3 changing attenuation, 1-9...
  • Page 94 R, Q, U bands, 3-2 RF to IF conversion, 4-5 V, W bands, 3-3 sensitivity results, 4-5 start and stop frequencies for HP 11970A, Q, U, V, W, 1-7 tracking results, 4-5 starting the program, 4-11 transmitter, 4-4 synthesized LO source timebase check and adjustment, 5-1...
  • Page 95 4-7 torque specifications for cables, 1-24 transmitter section, 6-3 purpose of each device, 6-3 using an HP 8350 LO power source, 1-18 using the HP 8340/41 RF source, 1-23 verification CW frequency accuracy, 4-4 maximum leveled power, 4-4 RF source calibration, 4-4 system configuration, 4-4...
  • Page 96 Index-iv HP 85325A Operating and Service Manual...

This manual is also suitable for:

85326a

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