HP 85027A Operating And Service Manual
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HP 85027A Operating And Service Manual

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~irector
US
P!avy Cahbrat!on Laboratory
Box 16 US
Naval Air Station
FPO San Francisco 96654-2901
OPERATING AND SERVICE MANUAL
HP 85027A/B/C
DIRECTIONAL
BRIDGE
H EWLETT
(bgI
PACKARD
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  • Page 1 OPERATING AND SERVICE MANUAL HP 85027A/B/C DIRECTIONAL BRIDGE ~irector P!avy Cahbrat!on Laboratory Box 16 US Naval Air Station FPO San Francisco 96654-2901 é~ > H EWLETT (bgI PACKARD...
  • Page 2 ‘Copyright Hewlett-Packard Company (HF). Reproduced with HP permission. Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
  • Page 3 HP Number: HP 85027A/B/C current and accurate as possible. Hewlett-Packard recommends that you periodically request the latest edition of this supplement. Free copies are available from all HP Date Printed: July 1985 offices. When requesting copies, quote the manual identification information from your Part Number: 85027-90001 supplement, or the model number and print date from the title page of the manual.
  • Page 4 HP 85027A/B/C General Information Table 1-1. Specifications HP 85027A HP 85027B HP 85027C 0.01 -1 8.0 Frequency Range (GHz)1 0.01 -26.5 0.01 -1 8.0 3.5mm (f) Type N (1) Type N (f) Connector: Input Test Port APC-7 3.5mm (f) Type N (f) Max.
  • Page 5 Connect the 50 ohm load to the input port of the directional bridge under test. 6. On the HP 8757A turn on the cursor and press the [MAX]softkeyto find the point of minimum return loss (highest point) on the trace. Enter this value on the Performance Test Record.
  • Page 6 Disconnect the power sensor from the attenuator. Turn on modulation. Con- nect the bridge input port to the attenuator, leaving the test port open. On the analyzer, turn on averaging (avg. factor =8), and the cursor. On the HP 8757A, turn on smoothing (5%).
  • Page 7 HP 85027A/B/C Adjustments DC Mode RF Adjustment Check 21. On the source, turn on the RF power. 22. Set the attenuator to 0 dB. 23. On the analyzer, verify DC mode, averaging, smoothing, and the cursor are still on. Allow the trace to settle. Press [DISPLAY] [MEAS-.MEM] [MEAS-MEM].
  • Page 8 HP 85027A/B,/C DIRECTIONAL BRIDGE SERIAL NUMBERS This manual applies directly to the HP 85027A/B/C directional bridge with serial numbers prefixed as follows: Model Serial Prefix HP 85027A 2522A HP 85027B 2522A HP 85027C 2522A For additional information about serial numbers, refer to INSTRUMENTS COVERED BY MANUAL in Section 1 and BACKDATING, Section 7.

  • Page 9: Table Of Contents

    HP 85027A/B/C Table of Contents CONTENTS Section Page GENERAL INFORMATION Introduction Specifications Safety Considerations Instruments Covered by Manual Description Equipment Required But Not Supplied Scalar Network Analyzer HP 8757A HP 8756A HP 8755C Swept Signal Source HP 8350B HP 8340A...
  • Page 10 HP 85027A/B/C Table of Contents PERFORMANCE TESTS Introduction Performance Test Record Directivity Description Equipment Procedure Below 2 GHz 4..3 Above 2 0Hz Test Port Match Specifications Description Equipment Procedure Dynamic Power Accuracy (AC and DC) Specifications Description Equipment Procedure 4-10...
  • Page 11 HP 85027A/B/C Table of Contents FIGURES Figure Title Page HP 85027A Directional Bridge in Accessory Case Supplied HP 85027A, 85027B and 85027C Directional Bridges HP 85027B with Connector Saver HP 85027 Features (Rear View) Typical Operator’s Check Using HP 8757A...
  • Page 12 HP 85027A/B/C Table of Contents TABLES Table Title Page Specifications Supplemental Characteristics System Verification Kits Accessories Available (Adapters and General) Recommended Test Equipment 1-10 Contents of HP 85027 Directional Bridges Directivity Performance Test Record Test Port Match Performance Test Record...
  • Page 13 HP 85027A/B/C General Information Figure 1-1. 1-IP 85027B in Accessory Case Supplied...

  • Page 14: General Information

    85027B and 85027C directional bridges in this manual. When the three different bridges share a common trait or procedure, they will be referred to as the HP 85027. The HP 85027B in its case is illustrated in Figure 1-1. Figure 1-2 shows all three directional bridges.
  • Page 15 HP 85027A/B/C General Information Figure 1-2. LIP 85027A, 85027B arid 85027C Directional Bridges...

  • Page 16: Description

    The HP 8757A is completely programmable through HP-lB (Hewlett-Packard Interface Bus, HP’s hardware, software, documentation and support for IEEE-488 and IEC 625). Additionally the HP 8757A can control a plotter, a printer, such as the Thinkjet printer, and a swept source through the 8757 System Interface.

  • Page 17: Swept Signal Source

    Power Splitter Ratio measurements can be made with the addition of a power splitter. The HP 1 1667A has a frequency range of DC to 18 GHz; the HP 11667B, DC to 26.5 GHz. EQUIPMENT AVAILABLE Additional equipment available for use with the HP 85027 directional bridges and the HP 8757A scalar network analyzer is listed in Section 1 of the analyzer’s Operating and...

  • Page 18: Recommended Test Equipment

    Performing any disassembly or repair procedure not included in Section 8, Service, of this manual will void the warranty. Subjecting a HP 85027 bridge to RF input power levels in excess of +23 dBm or ±10 volts will likewise void the warranty.
  • Page 19 HP 85027A/B/C General Information Table i-i. Specijications HP 85027A HP 85027B HP 85027C Frequency Range (0Hz) 1 0.01-18.0 0.01-26.0 0.01-18.0 Type N (f) Connector: Input Type N (f) 3.5mm (f) Test port APC-7 3.5mm (f) Type N (f) +23 dB or +23 dB or Max.
  • Page 20 HP 85027A/B/C General Information Dimensions 26 mm high x 124 mm wide x 118 mm deep (1.0” x 4.9” x 4.4”) 1219 mm (48”) cable length Weight net: 0.5 kg (12 lb) shipping: 2.3 kg (5 lb) 1 Unless otherwise noted, all specifications apply from 0°Cto +55°C.
  • Page 21 HP 85027A/B/C General Information Table 1-2. Sup pleinenlal Characteristics Values in this table are not specifications but are typical, non-warranted performance parameters included for user information. Typical Directivity with Connector Savers (Adapters) (To 3.5mm male or female) .—. Bridge Only (Specification) ~hCennete~verlYPic.l~H...
  • Page 22 HP 85027A/B/C General Information Table System Verification Kits 1-3. HP 85023A (APC-7) for use with HP 85027A HP Part or Model No. Accessory APC-7 open/short 85021-60001 N (m) to N (m) adapter 1250-1475 APC-7 50 ohm termination 909A APC-7 10 dB pad...
  • Page 23 HP 85027A/B/C General Information Table 1- 5. Recommended Test Equipment Instrument Critical Specifications 8502 7A 8502 7B 8502 7C 85027 AC/DC compatible Scalar 8757A 8757A 8757A Network Analyzer 8757A compatible 8350B 8350B 8350B Sweep Oscillator with with with Frequency: 0.01...

  • Page 24: Installation

    (see Section 8, “Mechanical Inspection”) and use connector savers whenever possible (see Figure 3-1). CAUTION Do not apply more than +23 dBm RF power or more than ±10 volts DC to the HP 85027. More power or voltage will damage the bridge.

  • Page 25: Preparation For Use

    Power for the HP 85027 is supplied by the network analyzer. Connecting the HP 85027 Insert the connector of the bridge’s power cable (Wl) into the A, B, (C if HP 8757A, Option 001) or R mating connector of the analyzer and turn the outer sleeve clockwise to tighten it.

  • Page 26: Storage And Shipment

    Hewlett-Packard offices. Alternatively, comparable packaging materials may be used. in any case, please observe the following guidelines: Wrap the bridge in heavy paper or anti-static plastic. If shipping to a HP Office or Service Center complete and attach a service tag (HP P/N 9320-3896, see Section 6 of this manual or another system component manual).

  • Page 27: Operation

    Operating manual. Figure 3-2 of this manual illustrates the features of the bridges. Figure 3-2 shows a typical measurement setup with the HP 8757A. When you use the bridge with the HP 8757A, set the configuration switch on the bridge to the...
  • Page 28 HP 85027A/B/C Operation [HP8757] position. If you are using the HP 8756A or 8755C with the HP 85027, set the bridge configuration switch to [HP8756/HP8755] a nd refer to that analyzer’s manual for the corresponding setups. Figure 3-5 shows a typical measurement setup using a power splitter.
  • Page 29 DUT. 4. Configuration switch Si. This switch sets the bridge for use with either the HP 8757A or HP 8756A/8755C. 5. Test port connector J2 (3.5 mm). Connect the DUT, calibration short or open here.

  • Page 30: Operator's Check

    Incorrect results may be caused by any portion of the system, but if the HP 85027 is suspected use the performance tests in Section 4 to determine whether the bridge is operating correctly. If the bridge fails those tests, turn to Section 8 to isolate the problem.
  • Page 31 HP 85027A/B/C Operation PRESET the HP 8757A and turn off channel 2. Set the HP 8350B to output 50 MHz swept CW. Perform a short/open calibration and then press [DISPLAY][MEAS-MEM] on the HP 8757A for normalized measurements. Turn on the cursor.
  • Page 32 HP 85027A/B/C Operation POS Z BLANK POS Z BLANK ONLY REQUIRED IF HP B3SOB HAS SERIAL PREFIX 2436 OR BELOW. Figure 3-4. Typical Measurement Setup using LIP 8757A POS 2 BLANK POS 2 BLANK ONLY REOUIRED IF HP 8350B HAS SERIAL PREFIX 2436 OR BELOW.

  • Page 33: Performance Tests

    DIRECTIVITY Description Directivity is a measure of the ability of a directive device (in this case the HP 85027) to discriminate between incident and ref lected signals. In principle directivity can be measured when the test port is terminated with a perfect load to absorb (and thereby eliminate) all reflected signals.

  • Page 34: Equipment

    Connect the equipment as shown in Figure 4-1. Do not connect anything to the bridge test port. On the HP 8757A, press [PRESET] to configure the system. The HP 8757A PRESET will also (I) set the sweep time and turn on the modulation of the sweep oscillator and (2) turn on the RF output and set the power level of the RF plug-in.

  • Page 35: Below 2 Ghz

    Perform a short/open calibration by pressing [CAL] on the HP 8757A and then following the prompts on the CRT. Attach the fixed load to the test port of the HP 85027. On the analyzer, press [CURSOR] and softkeys [CURSOR ON] and [MAX] to find the point of minimum return loss (the high point on the trace).

  • Page 36: Above 2 0Hz

    Connect the sliding load to the test port of the bridge. (Refer to the sliding load’s Operating and Service Manual if need be.) On the HP 8757A press [AUTOSCALEI to position the trace on the display. Slowly move the sliding load back and forth: the trace should change slightly as the phase of the sliding load reflection changes.
  • Page 37 Slowly retract the center conductor of the sliding load about 2mm. This will introduce a discontinuity at the HP 85027 test port and change the measured directivity. Repeat steps 10 and 11 above. After the signals are separated, one of the two should match one of the two separated signals from the first measurement.
  • Page 38 HP 85027A/B/C Performance Tests Table 4-1. Direc1ivit~’Performance Test Record HP 85027 Frequency Scalar Sum of Upper Limit Band (0Hz) Directivity Signals (from Figure 4-2) 0.01-2.0 2.0-12.4 12.4-18.0 I 8.0~20.0* 20.0~26.5* *HP 85027B only...

  • Page 39: Test Port Match

    Using a typical reflection measurement setup, as shown in Figure 4-4, a second directional bi-idge is used to measure the TEST PORT of the bridge under test. The bridge under test must be biased by the HP 8757A and its RF IN PORT must be properly terminated.

  • Page 40: Equipment

    Connect the 50 ohm load to the input port of the directional bridge under test. On the HP 8757A turn on the cursor and press the [MAX] softkey to find the point of minimum return loss (highest point) on the trace. Enter this value on the Performance Test Record.

  • Page 41: Dynamic Power Accuracy (Ac And Dc)

    HP 85027A/B/C Performance Tests *Approxin-~ate uncertainity excluding effect of any adapter used. DYNAMIC POWER ACCURACY (AC and DC) Specifications The dynamic power accuracy specifications for the bridge in AC mode are incorporated in Table 4-3, Dynamic Power Accuracy, which follows.

  • Page 42: Procedure

    Section 8, Troubleshooting. If you are using an HP 8757A with the bridge and wish to test its DC dynamic power accuracy, return to the SYSTEM menu, select DC mode and perform a short/open calibration by pressing these keys: [SYSTEM] [MODE] [CAL] [SHORT/OPEN] [DISPLAY]and [MEAS-MEM].

  • Page 43: Adjustments

    ADJUSTMENTS INTRODUCTION You do not have to make any adjustments to the HP 85027 for regular calibration or normal use. However, if you repair oi- replace the internal bridge microcircuit assembly (Al) or the circuit board assembly (A2), you must make the following adjustments to match the preamplifier to the characteristics of the microcircuit.

  • Page 44: Ac Adjustment Procedure

    HP 85027A/B/C Adjustments Figure 5-2. Locations of A djustment Potentiometers AC Adjustment Procedure Set up the equipment as shown in Figure 5-1. Turn on the analyzer, source and power meter and allow 30 minutes for warm-up. Refer to Figure 5-2 for locations of the adjustments.

  • Page 45: Dc Adjustment Procedure

    Connect the input port of the bridge to the attenuator. Leave the test port open. On the HP 8757A or 8756A, turn on the averaging (8, default factor) and cursor. On the also HP 8757A turn on the smoothing (5%, default factor).

  • Page 46: Dc Mode Rf Adjustment Check

    HP 85027A/B/C Adjustments NOTE Steps 19 and 20 must be rel)eated until no further change is noted. DC Mode RF Adjustment Check Turn on the source RF. Connect the power meter sensor to the calibrated 10 dB step attenuatoi-. Set the attenuator for 0 dB.

  • Page 47: Replaceable Parts

    Tables 6-3A, 6-3B and 6-3C are the re- placeable parts lists for the HP 85027A, 85027B and 85027C respectively. They list the replaceable parts in reference designator order. Table 6-4 lists the replaceable pai-ts of A2 Circuit Board, common to all three bridges.

  • Page 48: Ordering Information

    HP 85O27A/B/C Replaceable Parts The five digit code of the typical manufacturer of the part. The manufacturer’s part number for the part. NOTE The total quantity for each part is given only once, at the first appearance of the part in the list.
  • Page 49 HP 85027A/B/C Replaceable Parts ABBREVIATIONS adjustable root-mean-square ASSY assembly signal board silicon ceramic signal DBLHX double camfered, hex solder SLDR fixed straight giga (1O~) tantalum 1000 thread milli-amp terminal million (106) trimmer TRMR manufacturer turn megahertz microfarad picofarad volts, direct current...
  • Page 50 HP 85O27A/B/C Replaceable Parts Table 6-3A. HP 85027A Replaceable Parts Reference HP Part Description Mfr Part Number Designation Number Code 85027A REPLACEABLE PARTS 5086-7376 BRIDGE MICROCIRCUIT ASSEMBLY (NEW) 28480 5086-7376 5086-6 376 BRIDGE MICROCIRCUIT ASSEMBLY (REBUILT) 28480 5085-637 6 A2~~...
  • Page 51 Only the parts listed are replaceable. Any attempt to perform any disassembly or repair procedure not specifically outlined in Section 8 of this manual will void the warranty. Damaged con- nectors can be repaired or replaced only by Hewlett-Packard. Figure 6-lA. HP 85027A Replaceable Parts Identification...
  • Page 52 HP 85027A/B/C Replaceable Parts Table 6-3B. HP 85027B Replaceable Parts Reference HP Part Mfr Part Number Description Code Designation Number 85027B REPLACEABLE PARTS 5086-7377 BRIDGE MICROCIRCUIT ASSEMBLY (NEW) 28480 5086-7377 5088-0377 BRIDGE MICROCIRCUIT ASSEMBLY (REBUILT) 28480 5086-6 377 CIRCUIT BOARD ASSEMBLY...
  • Page 53 Only the parts listed are replaceable. Any attempt to perform any disassembly or repair procedure not specifically outlined in Section 8 of this mnanual will void the warranty. Damaged con- nectors can be repaired or replaced only by Hewlett-Packard. Figure 6-lB. HP 85027B Replaceable Parts Identification...
  • Page 54 HP 85027A/B/C Replaceable Parts Table 6-3C. HP 85027C Replaceable Paris Reference HP Part Description Mfr Part Number Designation Number Qt~/ Code 650270 REPLACEABLE PARTS BRIDGE MICROCIRCUIT ASSEMBLY (NEW) 5086-7399 28480 5086-7399 BRIDGE MICROCIRCUIT ASSEMBLY (REBUILT) 5086-6399 26480 5086-6399 CIRCUIT BOARD ASSEMBLY A2”...
  • Page 55 Only the parts listed are replaceable. Any attempt to perform any disassembly or repair procedure not specifically outlined in Section 8 of this manual will void the warranty. Damaged con- nectors can be repaired or replaced only by Hewlett-Packard. Figure 6-iC. HP 8502 7C Replaceable Parts Identification...
  • Page 56 HP 85027A/B/C Replaceable Parts Table 6-4. A 2 Bridge Circuit Board A ssembli’ Reference Description Mfr Part Number HP Part Code Designation Number A2 BRIDGE CIRCUIT BOARD ASSEMBLY 85027-60001 BRIDGE PC BOARD ASSEMBLY 28480 85027-60001 0160-5375 CAPACITOR-FXD .1UF *-l0°/o 50V0C CER...
  • Page 57 HP 85027A/B/C Replaceable Parts Figure 6-2. A 2 Circuit Board Component Location (Component Side) Figure 6-3. A 2 Circuit Board Component Location (Solder Side) 6-il...

  • Page 58: Manual Backdating Changes

    HP 85027A/B/C Manual Backdating Changes SECTION 7 MANUAL BACKDATING CHANGES INTRODUCTION By following the instructions on this page, you can adapt this manual to any instrument with a serial number prefix lower or higher than the one on the title ..page.

  • Page 59: Service

    You will find in this section information concerning troubleshooting and repair of the HP 85027. Heed the caution signs or risk damaging the bridge. You may wish to read the Theory of Operation with its associated diagrams as an aid to troubleshooting.
  • Page 60 To obtain access to the interior of the HP 85027, proceed as follows: Disconnect the bridge from the analyzer. With the HP 85027A only, use a thin 1/2 inch open-end wrench to remove the coupling nut from the APC-7 test port connector.
  • Page 61 Note that the pads on which the wires are soldered are labeled as indicated in Table 8-I. Input Port and Test Port Resistance Checks Disconnect the HP 85027 from the analyzer. Momentarily ground the leads of the DMM by touching them to its grounded chassis. CAUTION WORK STATIC-FREE.
  • Page 62 Reassembly the remaining parts of the bridge. Al Bridge Microcircuit Assembly Replacement Type the serial number of the HP 85027 on the rear panel label supplied with the new or replacement bridge assembly. On the HP 85027A only, remove the coupling nut from the APC-7 test port connector with a thin 1/2 inch open-end wrench.
  • Page 63 HP 85027A/B/C Service Turn the bridge over. Remove the four screws which fasten the microcircuit assembly. Take out the microcircuit assembly. Note the stainless steel spacer under it. Install the spacer over the screw holes and the bridge microcircuit assembly over the spacer.

  • Page 64: Connector Inspection

    O. 44Vrms. Clock/Control Check With the HP 85027 configuration switch set at [HP8756/HP8755], verify that there is no squarewave output at U2 pins 1, 2 and 4. Set the HP 85027 configuration switch to the [HP8757] position.
  • Page 65 HP 85027A/B/C Service WRAP THIN FOAM OR A LINT-FREE N OTE CLOTH AROUND A SLENDER WOODEN TRYTO CLEAN THE CONNECTOR WITH ROD (SUCH AS A TOOTHPICK) FOR CLEANING AREAS THAT ARE TOO COMPRESSEDAIR BEFORE RESORTING SMALL FOR THE SWABS. TO SWABS.

  • Page 66: Mechanical Inspection

    HP 85027A/B/C Service Mechanical Inspection Gaging the Precision 3.5mm Connector: Use a precision 3.5mm connector gage to check the mechanical dimensions of the connector. The tolerances are tight, but must be met to ensure perfect mating between the connector surfaces. Perfect mating both ensures a good electrical match and reduces the possibility of connector damage.
  • Page 67 Also take care with initial alignment: push the two connectors straight together without overtightening or rotating either center conductor. Use a torque wrench (HP part number 87 10-1582) for the final connection. This torque (5 lb-in, 60 N-cm) is less than is used when mating 3.5mm connectors together.
  • Page 68 HP 85027A/B/C Service GRASP THE GAGE HERE FOR MAXIMUM STABILITY. GAGE FOR MALE CONNEC- TORS HAS CIRCULAR BUSHING AROUND GAGE PLUNGER. USE PROTRUDING END OF GAGE CALIBRATION BLOCK TO ZERO MALE CONNECTOR GAGE. SCALE DIVISIONS 000025 EXAMPLE READING IS + 0.00425...
  • Page 69 HP 85027A/B/C Service USE PROTRUDING END OF GAGE GRASP THE GAGE HERE FOR MAXIMUM STABILITY. CALIBRATION BLOCK TO ZERO MALE CONNECTOR GAGE USE OTHER END (FLAT) TO ZERO FEMALE GAGE. CAREFULLY ALIGN CIRCULAR BUSH- ING AND PROTRUDING END. THEN FIRMLY SEAT GAGE CALIBRATION...
  • Page 70 HP 85027A/B/C Service OUTER CONDUCTOR MATING PLANE CAREFULLY ALIGN GAGE AND CON- BUSHING GRASP THE GAGE HERE NECTOR SO THAT CIRCULAR BUSHING FOR MAXIMUM STABILITY. AROUND GAGE PLUNGER WILL COME TO REST ON OUTER CONDUCTOR MATING PLANE. ALLOWABLE RANGE OUTER CONDUCTOR (—) 0.000 in...

  • Page 71: Gaging The Apc-7 Connector

    HP 85027A/B/C Service Gaging the APC-7 Connector: APC-7 connectors have 3 parts which determine the 2 critical diniensions in terms of mating surfaces. Figure 8-10 shows these parts and their critical dimensions. The outer conductor may be recessed or protruding from the extreme end of the connector coupling sleeve.
  • Page 72 HP 85027A/B/C Service (DO NOT USE AS A HANDLE) DIAL LOCK SCREW RELEASE SCREW TO ROTATE DIAL WHEN ZEROING GAGE. RANGE INDICATOR INDICATES FIRST TWO DIGITS OF ACTUAL READING. GRADUATED DIAL (RED) READINGS INDICATE — RECESSION OF CENTER CONDUCTOR + (BLACK)
  • Page 73 HP 85027A/B/C Service HOLD THE GAGE HERE, FOR MAXIMUM STABILITY. DO NOT HOLD THE GAGE HERE, BECAUSE THE GAGE TENDS TO CALIBRATION BLOCK WOBBLE USE THIS END WHEN THE ALIGNMENT PIN IS USED. FIRMLY SEAT CALIBRATION BLOCK. MAIN POINTER AND SMALLER RANGE POINTER MUST BOTH ALIGN WITH THE ZERO MARKS.
  • Page 74 HP 85027A/B/C Service ALLOWABLE RANGE (ALL CONNECTORS): +0.002 INCH TO +0.010 INCH CENTER COLLET MUST PROTRUDE BEYOND PLANE OF OUTER CONDUCTOR 0.002 —0.010 INCH (0.05 0.25mm). — ALLOWABLE RANGE (ALL CONNECTORS): +0.002 INCH TO PLANE OF OUTER CONDUCTOR +0.010 INCH...
  • Page 75 HP 85027A/B/C Service REMOVING OLD COLLET. REPLACING OLD COLLET, OR INSERTING NEW COLLET. PUSH LIGHTLY TO BLUNT PLASTIC FORCEPS SNAP INTO PLACE. Figure 8-11. Collet Removal and Replacement, APC- 7 Connectors 8-18...

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