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HP 8970B Service Manual

Option 020
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HP 8970B Option 020
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Summary of Contents for HP 8970B

  • Page 1 HP 8970B Option 020 Service Manual Supplement...
  • Page 3 Service Manual Supplement HP 8970B Option 020 HP Part no. 08970-90115 Edition 1 May 1998...
  • Page 4 Open Software Foundation, Inc. in the USA and other countries. © Copyright Hewlett-Packard Company May 1998 All rights reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Printed in the UK. HP 8970B Option 020 Service Manual Supplement...

  • Page 5: Printing History

    Printing History Printing History Manual Date Notes Edition May 1998 08970-90115 HP 8970B Option 020 Service Manual Supplement...

  • Page 6: List Of Related Publications

    HP 8970B Noise Figure Meter Service Manual About this Manual This document is a supplement to the HP 8970B Noise Figure Meter Service Manual (08970-90054) and provides information useful for operating the HP 8970B Option 020. It also gives some troubleshooting tips.

  • Page 7: Table Of Contents

    Table of Contents Page Printing History .....................iii List of Related Publications .................. iv About this Manual ....................iv Block Diagram and Parts List..................1-1 Block Diagram......................1-2 Front End ........................ 1-3 Material List ......................1-5 Theory of Operation ..................... 2-1 General ........................
  • Page 8 Contents-2 HP 8970B Option 020 Service Manual Supplement...

  • Page 9: Block Diagram And Parts List

    Block Diagram and Parts List...

  • Page 10: Block Diagram

    Block Diagram and Parts List Block Diagram Block Diagram Figure 1-1: HP 8970B Option 020 Front End Schematic 2.05 GHz Low Pass Filter 4 - 6 GHz Y.T.O PAD 1 (924) (925) PAD 2 PAD 3 (926) INPUT ASSEMBLY ISOLATOR...

  • Page 11: Front End

    Block Diagram and Parts List Front End Front End Figure 1-2: HP 8970B Front End Schematic 2050 MHz LPF 2 dB 10 dB 20 dB 10 dB 10 dB Limiter Detector INPUT ASSEMBLY Diode 10 - 2047 MHz Output Limiter (on 08970-60125 YTO Output Input Assembly only).
  • Page 12 In Figure 1-1 the numbers in brackets inside the input assembly refer to the wire colors. The numbers at the side of the second convertor refer to the wire colors attached to the connector which connects up to the second convertor. HP 8970B Option 020 Service Manual Supplement...

  • Page 13: Material List

    Block Diagram and Parts List Material List Material List Table 1-1: HP 8970B Option 020 Material List - main differences for Option 020 Description Part Number Quantity 2.05 GHz Low Pass Filter 0955-0634 Semi-rigid cable W1 08970-20082 Input Assembly 08970-60097...
  • Page 14 Block Diagram and Parts List Material List HP 8970B Option 020 Service Manual Supplement...

  • Page 15: Theory Of Operation

    Theory of Operation...

  • Page 16: General

    The 3600 MHz can be monitored at the LO Monitor port. The 600 MHz supplied to the second convertor comes from a 600 MHz SAW Oscillator. The frequency is adjusted for 600 MHz 50 KHz. The power should be > -3 dBm. HP 8970B Option 020 Service Manual Supplement...

  • Page 17: Adjustments

    Adjustments...

  • Page 18: General

    2. The 600 MHz SAW oscillator frequency adjustment. Input power detector Gain and Offset Adjustment Follow the adjustment procedure in section 5-13 of the Adjustments Chapter in the 8970B Service Manual with the following exceptions. Figure 3-1: Input detector gain and offset adjustment...

  • Page 19: 600 Mhz Saw Oscillator Frequency Adjustment

    2. On the 8568A. Press PRESET, CENTRE FREQUENCY 600 MHz, SPAN 500 KHz. 3. Connect the 600 MHz SAW Resonator to the 8568A RF Input. 4. Adjust R6 until the signal on the screen is 600 MHz 50 KHz. HP 8970B Option 020 Service Manual Supplement...
  • Page 20 Adjustments 600 MHz SAW Oscillator Frequency Adjustment HP 8970B Option 020 Service Manual Supplement...

  • Page 21: Board Differences

    Board Differences...

  • Page 22: General

    The same part number 08970-60033 is used in both instruments. However the firmware is different for the option 20 compared to the standard. Table 4-1: Firmware Part Numbers Options ROM #1 ROM #2 08970-80050 08970-80051 Option 20 08970-80070 08970-80071 HP 8970B Option 020 Service Manual Supplement...

  • Page 23: 20 Mhz If Assembly (08970-60050)

    0.01 uF 51.1 1000 4.7 pF 1.5 uH 56 pF 6.5 TO 01 uF 6.9 Vdc 7.3 TO 1000 7.7 Vdc 1780 0.01 uF -15V (F1) 1. Differences are highlighted with a shaded background. HP 8970B Option 020 Service Manual Supplement...

  • Page 24: Driver Assembly (08970-60089)

    Figure 4-2: Schematic differences in 08970-60089 1000 pF U33D 1ST LO DRIVE 3060 1 uF 1ST LO (SEE NOTE 9) 5V (F1) 6.8 uF -5 VOLT REGULATOR 1. Differences are highlighted with a shaded background. HP 8970B Option 020 Service Manual Supplement...

  • Page 25: Fault-Finding Tips

    Fault-Finding Tips...

  • Page 26: General

    The best way to measure this part is to use a network analyzer. An alternate way is to use a spectrum analyzer, e.g. 8593E with a tracking generator or a separate sweeper. Verify over the frequency ranges above that the insertion losses are correct. HP 8970B Option 020 Service Manual Supplement...

  • Page 27: Input Assembly (08970-60097 Or 08970-60125)

    From the functionality viewpoint it is possible to check that pads and amplifier are working individually by using Special 63.X. To verify the pads and amplifiers of with the 8970B completely boxed up use the procedure “RF Attenuator Checks” in the Service Sheet BD1 section of the standard 8970B manual.

  • Page 28: Yig Tuned Oscillator (0955-0630)

    In order for the mixer to work correctly the input level to the L.O port should be greater than 10 dBm. This can be tested over the frequency range by carrying out the test in section 5.3 but measured at J5 rather than the YTO output. HP 8970B Option 020 Service Manual Supplement...

  • Page 29: Isolator (0960-0638)

    The best way to do this is at spot frequencies say 100 MHz steps or if the problem is at a known frequency then do it there. The example is for 100 MHz. Setup the 8970B. Preset, Frequency 100 MHz, Special 63.0 Set the source for -20 dBm, 100 MHz Measure the signal level at J2 and record it.

  • Page 30: Second Convertor (5086-7909)

    600 MHz SAW Oscillator (08970-60093) This board delivers the 600 MHz to the second convertor. Figure 3-2 shows the adjustment procedure. The frequency should be 600 MHz 50 KHz The power should be > -3 dBm HP 8970B Option 020 Service Manual Supplement...

  • Page 31: Board Details

    Board Details...
  • Page 32 Board Details Figure 6-1: 600 MHz SAW Oscillator Component Layout Drawing HP 8970B Option 020 Service Manual Supplement...
  • Page 33 Board Details Figure 6-2: 600 MHz Schematic HP 8970B Option 020 Service Manual Supplement...
  • Page 34 Board Details Figure 6-3: Input Section Component Layout Drawing (for Assembly 08970-60097) HP 8970B Option 020 Service Manual Supplement...
  • Page 35 Board Details Figure 6-4: Input Section Schematic (for Assembly 08970-60097) HP 8970B Option 020 Service Manual Supplement...
  • Page 36 Board Details Figure 6-5: Input Section Component Layout Drawing (for Assembly 08970-60125) HP 8970B Option 020 Service Manual Supplement...
  • Page 37 Board Details Figure 6-6: Input Section Schematic (for Assembly 08970-60125) HP 8970B Option 020 Service Manual Supplement...
  • Page 38 Board Details Figure 6-7: HP 8970B Option 20 Hardware Mixer Input Section (A6) Isolator 600 MHz 4.5 GHz SAW Oscillator Second Convertor HP 8970B Option 020 Service Manual Supplement...
  • Page 40 © Copyright 1998 Hewlett-Packard Ltd Printed in UK May 1998 Manufacturing Reorder No. Part No. 08970-90115 08970-90115...

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