HP 10811A Operating & Service Manual
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HP 10811A Operating & Service Manual

HP 10811A Operating & Service Manual

Quartz crystal oscillator
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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.
No changes have been made to this manual, with the exception of correcting the odd
spelling and grammatical errors. In some places original photographs may be replaced
or augmented with modern digital photographs. (it's weird looking at an old BW HP
manual and seeing a color photograph... still gets me)
All pages are scan at 600 DPI and in some cases (schematics) scaled down to fit
8½x11 page. If you wish to print on 11x17 or larger just print the page and scale to fit.
This manual is reproduced from scans of an original document, which is then converted
using my own custom designed OCR software, and then edited in Microsoft
This means that what you see here is not a scan of a scan/copy with text overlays.
OCR errors may exist and as such the user of this document should take care and use
common sense when referencing this documentation.
This documentation is © Copyright 1980 Hewlett Packard and © Copyright 2006, Jack
Hudler, hpdocs@hudler.org.
Permission to use and redistribute this documentation for non-commercial and internal
corporate purposes is hereby granted, free of charge.
Any redistribution of this documentation or its derivates must include this copyright
notice.
You may not sell this documentation or its derivations without written consent.
You may modify this documentation as necessary, but you may not sell derivative works
based on it.
You may include this documentation with the equipment/hardware on which it is used
for the purposes of selling the equipment/hardware. If you advertise that a copy of this
documentation is included in the sale, you must state that is for "Free".
Meaning if you want to gratuitously toss in a copy of the manual on an eBay sale, it's ok
with me as long as you state it's for free. No you can't sell a digital archive of manuals
and say it includes a free copy of this documentation. You must give it away with
equipment.
I think you get the spirit of the copyright; it takes a lot of hours to scan and replicate a
manual. I just want this used in the spirit in which is it given.
Agilent if you have questions or wish to include this in your archive, please email me.
Errata
10811A/B Quartz Crystal Oscillator Operating &
Service Manual
10811-90002
2028
August 1980
HP References in this Manual
Changes to this Manual
About this Manual
Copyright Notice
Model 10811A/B
®
Word 2003.

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Summary of Contents for HP 10811A

  • Page 1 No changes have been made to this manual, with the exception of correcting the odd spelling and grammatical errors. In some places original photographs may be replaced or augmented with modern digital photographs. (it’s weird looking at an old BW HP manual and seeing a color photograph… still gets me) All pages are scan at 600 DPI and in some cases (schematics) scaled down to fit 8½x11 page.
  • Page 2 Model 10811A/B Page Intentionally Left Blank...
  • Page 3 Model 10811A/B...
  • Page 4 OPERATING AND SERVICE MANUAL SERIAL PREFIX: 2028 This manual applies to Hewlett-Packard Model 10811 A/B Oscillators with serial prefix number 2028. Also covers oscillators with HP Part Numbers 10811- 60101 and 10811-60105. OTHER SERIAL PREFIXES For serial prefixes above 2028, a "Manual Change"...

  • Page 5: Table Of Contents

    SPECIFICATIONS ....................2 1-6. SAFETY CONSIDERATIONS................2 1-8. INSTRUMENTS COVERED BY THIS MANUAL ........... 2 1-13. DESCRIPTION....................... 4 1-19. HP Part Number 10811-60101 and 10811-60105 .......... 4 1-22. RECOMMENDED TEST EQUIPMENT ..............4 II. INSTALLATION....................6 2-1. INTRODUCTION....................6 2-3. INITIAL INSPECTION.................... 6 2-5.
  • Page 6 Printed Circuit Component Replacement ............49 8-47. Replacing Integrated Circuits ................49 8-50. TROUBLESHOOTING ..................50 8-57. DISASSEMBLY FOR TROUBLESHOOTING AND REPAIR.......51 8-61. SPECIAL TEST CONNECTOR FOR 10811A .............52 8-65. SPECIAL CABLE FOR THE 10811 B..............53 8-67. SPECIAL PARTS REPLACEMENT CONSIDERATIONS ........53 8-69. OVEN CONTROLLER TROUBLESHOOTING............55 8-70.
  • Page 7 Figure 1-1. 10811A and 108118 Oscillators ................... 1 Figure 2-1. Single Source Regulated Power Supply................7 Figure 2-3. 10811A Supply and Output Connections ................8 Figure 2-4. 10811B Supply and Output Connections ................9 Figure 2-5. Mechanical Mounting Dimensions..................10 Figure 3-1.
  • Page 8 NIST Time and Frequency Publication Database. The 10811A/B Quartz Crystal Oscillator has two manuals available. The Operating Instruction Manual is supplied with the oscillator and is intended for the user that desires only operating information. The Operating and Service Manual is a complete document containing both operating and servicing information.

  • Page 9: Figure 1-1. 10811A And 108118 Oscillators

    Model 10811A/B Figure 1-1. 10811A and 108118 Oscillators...

  • Page 10: General Information

    1-6. SAFETY CONSIDERATIONS 1-7. The Model 10811A/B Component Oscillator is a Safety Class III product and must be powered from a source which is electrically isolated from the mains (line circuits). Safety information pertinent to the operation and servicing of this instrument is included in the appropriate sections of this manual.

  • Page 11: Table 1-1. Specifications Table

    0.1 millitesla (1 Gauss) rms at 100 Hz. signal ratio per Hertz of bandwidth (a Connectors Humidity (typical): 1 X 10 for 95% RH at power spectral density). This ratio is 10811A: Mates with CINCH 250-15-30-210 40°C. analogous to a spectrum analyzer 1251-0160) equivalent (not Shock (survival): 30g, 11ms, ½...

  • Page 12: Description

    1-15. The 10811A/B has the ability to be adjusted over a range of 20 Hz (2 X 10 ), yet the control is sensitive enough to allow adjustment to better than 0.1 Hz (1 X 10 ).

  • Page 13: Table 1-2. Recommended Test Equipment

    Coax Adapter 15. Test Connector For testing 1 0811A See para. 8-61 *Not needed if items 2, 3, 4 are available. **Not needed if HP 5390A Frequency Stability Analyzer is available. ***If a 105A/B is used, its performance must be verified.

  • Page 14: Installation

    10 min. at 25°C with 20V dc applied. 2-8. Both the 10811A and 10811 B have separate ground return paths for each section (oscillator and oven circuits). Both grounds may be tied together or operated at any reasonable difference in potential.

  • Page 15: Single Source Regulated Power Supply

    The EFC input should be connected to oscillator circuit ground if not used. A shorting plug (1250- 0911) is supplied with 10811B for this purpose. The EFC input on the 10811A should be grounded at the printed circuit connector by wiring pins 5 and 6 together.

  • Page 16: Oven Monitor Output

    2-20. MATING CONNECTORS AND MOUNTING 2-21. The 10811A Oscillator requires a 15-pin printed circuit connector. The recommended connector is the CINCH 250-15-30-210 (HP 1251-0160). The 10811A can be secured with two 6-32 screws, 1/4-inch long. Figure 2-3 shows the power supply connection for the 10811A.

  • Page 17: Installation Instructions

    To optimize performance therefore: 1. The 10811A/B should be mounted in an area that has a minimum amount of vibration or shock accelerations. In addition, the 10811 A/B should be mounted so that the vibrational forces act along the "minimum G sensitivity"...

  • Page 18: Installation Instructions (Hp Instrument)

    90 dB from carrier. 2-32. ALTITUDE. The frequency change will be typically 2 for altitudes up to 15.2 km (50,000 ft.). 2-33. SHOCK. The 10811A/B can withstand a shock up to 30 Gs for 11 ms, 1/2 sine wave.

  • Page 19: Storage And Shipment

    Model 10811A/B 2-34. STORAGE AND SHIPMENT 2-35. Environment 2-36. The 10811A/B may be stored or shipped in environments with the following limits: Temperature ····························· -55°C to +85°C Altitude ······································ 15.2 Km (50,000 feet) 2-37. PACKAGING 2-38. Original Packaging 2-39. Containers and materials identical to those used in factory packaging are available through Hewlett-Packard offices.

  • Page 20: Operation

    Connect reference frequency standard (multiple or submultiple of 10 MHz) to the EXTERNAL SYNC INPUT of the oscilloscope. b. Connect oscillator output (10811A/B) to Channel A. Set the sweep speed to .1 μs/div. c. Set the oscilloscope to EXTERNAL TRIGGER and adjust the oscilloscope so that its sweep is synchronized to the reference frequency.

  • Page 21: Accuracy Vs Adjustment Interval

    Model 10811A/B For example, if the trace moves 1 division in 10 seconds and the sweep speed is 0.01 μs/div., the oscillator's frequency is 1 x 10 different from that of the reference frequency, as can be seen from the calibration, 3-1.

  • Page 22: Table 3-1. Accuracy Vs Adjustment

    Model 10811A/B 3-12. Find the line on Table 3-1 corresponding to the oscillator's aging rate. Then find the maximum allowable error (accuracy) on the horizontal axis. Follow the maximum allowable error vertically until it crosses the oscillator's known aging rate. Move horizontally to the left and read the minimum calibration interval in days.
  • Page 23 Model 10811A/B Page Intentionally Left Blank...

  • Page 24: Operational Verification

    4-4. 4-9. If the 10811A/B Oscillator is to be tested outside its normal installation, a special test connector may be used for applying power to the oscillator. The connector also has a BNC connector for the 10 MHz output signal. A photo, parts list, and construction information is located in Section VIII.

  • Page 25: Table 4-1. Operational Verification Descriptions

    5065A Rubidium Vapor Frequency Standard 5061A Option 004, or 105A/B, See Table 1-2 HP Model 5390A may be used in place of the following: 10830A Mixer 5345A Electronic Frequency Counter with Option 011 9825A Calculator with 98210A and 98213A or 98214A or 98216A...

  • Page 26: Table 4-2. Operation Verification Procedure

    Press the CAL button and adjust the 3406A to read 1V by adjusting the CALIBRATE control on the front panel. e. Remove the probe from the 1-volt jack and conned to the 10811A/B output through a 50 ohm termination.
  • Page 27 Signals greater than -65 dB indicate possible spurious signals on 10811A/B output. Be sure there is no other equipment nearby that could be radiating signals into the measurement. Be sure power supplies meet noise specifications as...
  • Page 28 Connect reference frequency standard (multiple or submultiple of 10 MHz) to the EXTERNAL SYNC INPUT of the oscilloscope. b. Connect the output of the 10811A/B to CHANNEL A INPUT. Adjust sweep speed to 0.1 μs/div. c. Set oscilloscope to EXTERNAL TRIGGER and adjust it so that its sweep is synchronized with the reference frequency.

  • Page 29: Optional Controllers And Counters

    Model 10811A/B Figure 4-1. BASIC Program 4-13. OPTIONAL CONTROLLERS AND COUNTERS 4-14. Optional Controllers 4-15. Figure 4-2 lists the program for the 9825A Calculator. Figure 4-2. HPL Program...

  • Page 30: Optional Counters

    Model 10811A/B 4-16. Optional Counters 4-17. Table 4-3 shows the program codes set required when using the 5316A counter. Replace line 4 (HPL) or line 40 (BASIC) with the appropriate codes. Be sure the optional counter address is set to "18".
  • Page 31 Model 10811A/B Page Intentionally Left Blank...

  • Page 32: Table 4-4. Operational Verification Record

    Model 10811A/B Table 4-4. Operational Verification Record...

  • Page 33: Adjustments

    NECESSARY PARTS ARE CONNECTED TO THEIR PROTECTIVE GROUNDING MEANS. 5-11. OSCILLATOR FREQUENCY ADJUSTMENT 5-12. The following frequency adjustment procedure is the same for both the 10811A and 10811B. Allow the oscillator to warm up for 24 hours before making this adjustment. See Figure 5-1.

  • Page 34: Offset Calculation

    Connect oscillator output to Channel A of the oscilloscope. Adjust sweep speed so pattern movement can be seen. c. Adjust oscillator frequency adjustment (FREQ AD) on 10811A/B Crystal Oscillator unit) for minimum sideways movement of the 10 MHz displayed signal. Increase oscilloscope sweep speed for greater resolution.

  • Page 35: Output Amplitude Adjustment

    2. Remove bottom cover and allow oscillator to cool (if previously operated). To remove cover: a. For the 10811A, remove the three screws securing the bottom cover. Remove the two screws securing the P.c. edge connector to the outer can. Remove the top foam insulator to expose the oscillator circuits.

  • Page 36: Figure 5-3. 108118 Amplitude Adj Set-Up

    Model 10811A/B 5. For the 10811A, connect Model 6215A Power Supply to pins 2 Hand 3 (+) of a 15 pin printed circuit connector. Insert the 10811A P.c. edge connector into the 15 pin P.c. connector. (See Section VIII for a special 10811 A test connector.)

  • Page 37: Replaceable Parts

    This section contains information for ordering replacement parts. Table 6-1 lists parts in alphanumerical order of their reference designators and indicates the description and HP Part Number of each part, together with any applicable notes. The table includes the following information.

  • Page 38: Component Parts And Materials

    6-7. Component Parts and Materials 6-8. Generally, the prefix of HP part numbers identifies the type of device. Eight-digit part numbers are used, where the four-digit prefix identifies the type of component, part, or material and the four-digit suffix indicates the specific type. Following is a list of some of the more commonly used prefixes for component parts.

  • Page 39: General Usage Parts

    6-20. REPLACEABLE PARTS LIST LAYOUT 6-21. The 10811A and 10811 B Oscillators are identical internally, except that the 10811 B has had the 15-pin pc edge connector removed and a 7-pin connector (11) placed on the board for the 10811...

  • Page 40: Table 6-1. Replaceable Parts

    Model 10811A/B Table 6-1. Replaceable Parts Reference HP Part Description Mfr Part Number Designation Number Code 10811-60001 CIRCUIT BOARD COMPONENTS 10811A/B 28480 10811-60001 0121-0511 TUNING CAPACITOR 28480 0121-0511 0160-0576 5 11 CAPACITOR-FXD .1uF ±20% 50VDC CER 28480 0160-0576 0160-5109 CAPACITOR-FXD 15pF ±5% 50VDC CER 0±30...

  • Page 41: Table 6-1. Replaceable Parts (Continued)

    Model 10811A/B Table 6-1. Replaceable Parts (Continued) Reference HP Part Description Mfr Part Number Designation Number Code R20* 0698-3700 RESISTOR 715 1% .125W F TC=0±100 24546 C4-1/8-T0-715R-F R20* 0698-4014 RESISTOR 787 1% .125W F TC=0±100 24546 C4-1/8-T0-787R-F R20* 0696-4196 RESISTOR 1.07K 1% .125W F TC=0±100...
  • Page 42 Model 10811A/B Table 6-1. Replaceable Parts (Continued) Reference HP Part Description Mfr Part Number Designation Code Number 10811A/B CIRCUIT BOARD MISCELLANEOUS PARTS 1200-0868 SOCKET-STRP 7-CONT DIP-SLDR 28480 1200-0868 0360-1244 TERMINAL-SPCL FEEDTHRU 28480 0360-1244 3050-0588 WASHER-FL NM NO. 6 145-IN-ID .23-IN-OD...

  • Page 43: Table 6-2. Manufacturers Code List

    Model 10811A/B Table 6-2. Manufacturers Code List MFR. NO. MANUFACTURER NAME ADDRESS ZIP CODE 00000 ANY SATISFACTORY SUPPLIER 03888 KDI PYROFILM CORP WHIPPANY, NJ 07981 04713 MOTOROLA SEMICONDUCTOR PRODUCTS PHOENIX, AZ 85062 07263 FAIRCHILD SEMICONDUCTOR DIV MOUNTAIN VIEW, CA 94042...
  • Page 44 Model 10811A/B Page Intentionally Left Blank...

  • Page 45: Manual Changes

    "Manual Changes" pages should accompany the manual. 7-7. If the "Manual Change" pages are missing from any HP manual, the information can be supplied by any Hewlett-Packard Sales and Service Office listed at the back of this manual.
  • Page 46 Model 10811A/B Page Intentionally Left Blank...

  • Page 47: Service

    Figure 8-2. 8-11. The 10811A/B oscillator is divided into three sections with each section connected by a .010-inch thick flexible circuit. Three small circuit boards are bonded to the flexible circuit to provide support in the areas where components are located. The arrangement allows the unit to be easily disassembled and operated in the disassembled state on the service bench.

  • Page 48: Figure 8-1. Schematic Diagram Notes

    Model 10811A/B Figure 8-1. Schematic Diagram Notes...

  • Page 49: Figure 8-2. 10811A/B Overall Block Diagram

    • B GROUND POINT FOR TESTING OVEN CONTROLLER. • B GROUND POINT FOR TESTING OVEN CONTROLLER. • A AND B GROUNDS MAY BE TIED TOGETHER OR FLOATED AT DIFFERENT POTENTIALS EXTERNAL TO THE OSCILLATOR. Figure 8-2. 10811A/B Overall Block Diagram...

  • Page 50: Main Oscillator Theory Of Operation

    Model 10811A/B 8-13. MAIN OSCILLATOR THEORY OF OPERATION 8-14. The 10811A/B oscillator is a Colpitts-type crystal oscillator which uses the crystal as the series inductor. Figure 8-3A shows the basic block diagram of a Colpitts-type oscillator. Figure 8-3B shows the basic equivalent components of the oscillator.

  • Page 51: Electronic Frequency Control (Efc)

    Model 10811A/B Figure 8-4. Mode Suppression 8-16. Figure 8-5 show the equivalent crystal circuits with the tuning capacitor C1. Figure 8-5. Frequency Tuning Circuit 8-17. C1 tuning capacitor is available from the top of the oscillator outer housing. The change in reactance of C1 allows the oscillator's frequency to be varied over a 20 Hz (2 X 10 ) range.

  • Page 52: Automatic Gain Control (Agc)

    Model 10811A/B Figure 8-6. EFC 8-20. AUTOMATIC GAIN CONTROL (AGC) 8-21. The output for the AGC (and output amplifiers, discussed later) is taken across capacitor C10, and is applied to Q3. Since C10 is effectively in series with the crystal, the current passing through the crystal also passes through C10.

  • Page 53: Rf Output Impedance Matching And Output Buffer

    Model 10811A/B 8-23. RF OUTPUT IMPEDANCE MATCHING AND OUTPUT BUFFER 8-24. The signal for the output amplifiers is taken from the same point as the AGC (across C10). The voltage is buffered by Q5 which is an impedance matching stage. Resistors R14 and R15 set the dc bias level while C14 allows the ac to bypass R14.

  • Page 54: Oven Heater And Controller Theory

    3. Heaters 8-30. In the 10811A/B oven, a thermistor (RT1) is secured with epoxy into a hole in the oven mass. U3 is the amplifier and Q7 (not shown) and Q8 are the heaters. It is the thermistor that senses the oven mass temperature.

  • Page 55: Precision Voltage Reference

    Model 10811A/B Figure 8-10. Oven Control Circuits 8-32. The purpose of R17 is mainly to reduce the power dissipated in the thermistor which causes it to self-heat above the oven operating temperature. 8-33. R38 and R39 in parallel provide a means of sensing the heater current, rH. During warm-up, the voltage across them, VH, is used in the current limit circuit (described later).

  • Page 56: Heater Transistor Balance

    Model 10811A/B Figure 8-11. Turn-on Current Limit Circuit 8-39. HEATER TRANSISTOR BALANCE 8-40. Because heater transistors Q7 and Q8 are not equally spaced from the crystal, it is necessary to offset the power dissipation between the two transistors. Figure 8-12 shows a simplified schematic of this circuit.

  • Page 57: Repair And Troubleshooting

    8-42. Inspection 8-43. The 10811A/B should be inspected for indications of mechanical and electrical defects. Electronic components that show signs of overheating, leakage, frayed insulation, and other signs of deterioration should be checked and a thorough investigation of the associated circuitry should be made to verify proper operation.

  • Page 58: Troubleshooting

    The troubleshooting is arranged to allow the technician to quickly find the defective component(s) without unnecessary removal of components. 8-50. TROUBLESHOOTING 8-51. Failures in the 10811A/B can be divided into two sections: 1. Failure of the oscillator's circuits. 2. Failure in the oven controller circuits. 8-52.

  • Page 59: Disassembly For Troubleshooting And Repair

    8-57. DISASSEMBLY FOR TROUBLESHOOTING AND REPAIR 8-58. Perform steps 1 through 3 for the 10811A oscillator and steps 4 and 5 for the 10811B oscillator. Once these steps are completed, follow steps 6 through 10 for both oscillators. 8-59.

  • Page 60: Special Test Connector For 10811A

    8-61. SPECIAL TEST CONNECTOR FOR 10811A 8-62. The following paragraphs describe a special 15-pin connector for use in troubleshooting, alignment and testing of the 10811A. The connector provides the following (See 8-13): Figure Two separate input leads for the oscillator circuits power and the oven heaters and controller circuits.

  • Page 61: Special Cable For The 10811 B

    If the voltages are connected the wrong way, damage to the 10811A may occur. 8-65. SPECIAL CABLE FOR THE 10811 B. 8-66. A micon to BNC adaptor cable is available for the 10MHz output signal. Order HP Part Number 05060-6116 (see Figure 8-13).

  • Page 62: Table 8-1. Temperature Set Resistor List

    (R20) for the oven. This resistor must be installed with the new crystal. The crystal and R20 can be ordered using HP Part Number 10811- 60108. If the temperature set resistor is found to be defective only, it must be replaced with the same value and tolerance.

  • Page 63: Oven Controller Troubleshooting

    Model 10811A/B d. Oven heater transistors Q7 and Q8: The replacement transistors for Q7 and Q8 have formed leads for easy installation (Part Number 10811-80001). Holding screws for Q7 and Q8 must also be torqued to a specific force of 44 newton-metres (5 in.-Ibs.). There are several available Pozidriv torquing screwdrivers.

  • Page 64: Normal Operation

    Model 10811A/B 8-74. Normal Operation 8-75. When the oven is tested under normal conditions (-25°C ambient temperature) it will initially draw 380 to 490 mA. After 5 to 10 minutes the oven current will start to drop. Over the next 10 to 15 minutes the oven current will fall to the 60 to 150 mA range where it will stabilize.

  • Page 65: Table 8-2. Oven Controller Troubleshooting Tree

    Model 10811A/B Table 8-2. Oven Controller Troubleshooting Tree...

  • Page 66: Oscillator Troubleshooting

    Q5 (base to collector) is approximately 2 with a 50-ohm load on the output. The output of transformer T1 is approximately 1.5V p-p. All10 MHz signals found in the 10811A/B will be undistorted sine waves unless otherwise noted in Table 8-4 (next to the schematic diagram).

  • Page 67: Troubleshooting Information

    8-4, Oscillator Normal Voltages). If this voltage appears normal, the Table problem may be a defective quartz crystal (Y1). To verify this possibility, obtain a 10 µH (HP Part No. 9100-2265) and a 12 µH inductor (9100-2242). Use the HP numbered parts as these have been tested in the circuit.
  • Page 68 TIME DOMAIN STABILITY (SHORT-TERM STABILITY) OUT OF SPECIFICATION. Mea- surement of time domain stability is somewhat difficult and exacting. If the 10811A/B fails this test, be sure no signal sources other than the test reference are operating near the measurement system, as these can cause interference with the measurement.

  • Page 69: Table 8-3. Oven Circuit Voltages

    Model 10811A/B Table 8-3. Oven Circuit Voltages· OVEN AT OVEN COLD (JUST VOLTAGE POINT OPERATING TEMP. AFTER TURN-ON) GROUNDED 11.4 11.4 11.4 12.5 12.7 11.9 11.4 11.4 11.4 11.4 11.4 11.4 U1 Pin 1 U1 Pin 2 U1 Pin 3...
  • Page 70 Model 10811A/B Page Intentionally Left Blank...
  • Page 71 Model 10811A/B...

  • Page 72: Figure 8-15. Oven Controller Schematic Diagram

    Model 10811A/B Figure 8-15. Oven Controller Schematic Diagram...
  • Page 73 Model 10811A/B...

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