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Tabor Electronics 8550 User Manual

50 mhz modulated function/pulse generators
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User Manual
8550/8551
50 MHz
Modulated Function/Pulse Generators
Tabor Electronics Ltd.
9 Hatasia Street, Tel Hanan, Israel 20302
TEL: (972) 4 821 3393, FAX: (972) 4 821 3388
[www.taborelec.com]
PUBLICATION DATE: December 10, 2003
REVISION: E
Copyright 2001 by Tabor Electronics. All rights reserved. This book or parts thereof may not be reproduced in
any form without written permission of the publisher.

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  • Page 1 TEL: (972) 4 821 3393, FAX: (972) 4 821 3388 [www.taborelec.com] PUBLICATION DATE: December 10, 2003 REVISION: E Copyright 2001 by Tabor Electronics. All rights reserved. This book or parts thereof may not be reproduced in any form without written permission of the publisher.

  • Page 2: Warranty

    WARRANTY Tabor warrants that all products manufactured by Tabor conform to published Tabor specifications and are free from defects in material and workmanship for a period of one (1) year from the date of delivery when used under normal conditions and within the service conditions for which they were furnished. The obligation of Tabor arising from a Warranty claim shall be limited to repairing, or at its option, replacing without charge, any product which in Tabor’s sole opinion proves to be defective within the scope of the Warranty.
  • Page 3 Tabor Electronics Ltd. REPAIR AND CALIBRATION REQUEST FORM To allow us to better understand your repair requests, we suggest you use the following outline when calling and include a copy with your instrument to be sent to the Tabor Repair Facility.

  • Page 4: Safety Precautions

    SAFETY PRECAUTIONS Protect yourself. Follow these precautions: • Don’t bypass the power cord’s ground lead with two-wire extension cords or plug adapters. • Don’t disconnect the green and yellow safety-earth-ground wire that connects the ground lug of the power receptacle to the chassis ground terminal (marked with •...

  • Page 5: Declaration Of Conformity

    EN 55022 - Radiated, Class B EN 55022 - Conducted, Class B EN 50082-1 Immunity: IEC 801-2 (1991) - Electrostatic Discharge IEC 801-3 / ENV50140 (1993) - RF Radiated IEC 801-4 (1991) - Fast Transients Model 8550 and Model 8551 were tested in typical configuration.

  • Page 6: Table Of Contents

    ......... . 3-1 3-2-1-3 Main Parameters - Model 8550 ......3-1...
  • Page 7 ..... 3-11 3-13-1 Normal Function Generator Operating Mode - Model 8550 ... . . 3-11 3-13-2 Linear/Logarithmic Sweep Operating Mode - Model 8550 .
  • Page 8 Decimal Numeric Response Data ......4-22 4-12 Reading From the Model 8550 ......4-22 Contents iii...
  • Page 9 4-12-1 Interrogate Parameter Data Query ......4-22 4-12-2 Common Queries ........4-23 4-12-3 Response Header (X) .
  • Page 10 FM an VCO Characteristics ....... 5-8 5-9-15 Sweep Characteristics (model 8550) ......5-9 5-9-16 Pulse Width Accuracy (model 8551) .
  • Page 11 SECTION 7. ADJUSTMENTS Introduction ......... Adjustments .
  • Page 12 Model 8550/8551 - List of Vendors ......8-1 Model 8550/8551 - Parts List ....... 8-2...
  • Page 13 Line Voltage and Fuse Holder ......Model 8550/8551 Outline Dimensions ......

  • Page 14: Section 1. General Information

    Microprocessor based, can not be completed due to electrical faults, the Model 8550 is easy to set up for manual use. It is generator produces a failure list that can be evaluated also simple to program in GPIB system environment.

  • Page 15: Instrument And Manual Identification

    DC environment. 1-6. ACCESSORIES SUPPLIED Model 8551 is a pulse/function generator and is Model 8550 is supplied with ac power cord and with also described in this manual. This instrument is an instruction manual. Extra manual is available on identical in its basic functions to the Model 8550.

  • Page 16: Frequency Characteristics

    Table 1-1. Model 8550/8551 Specifications WAVEFORMS: Sine, Triangle, Square, Positive Pulse, Negative Pulse, Ramp (Model 8551), DC (Model 8550) FREQUENCY CHARACTERISTICS Range: 10.00mHz to 50.00MHz. Resolution: 4 digits Accuracy: Continuous Mode: ±3% of reading, from 10mHz to 999.9mHz; ±0.1%, from 1.000Hz to 50.00MHz;...

  • Page 17: Triggering Characteristics

    Table 1-1. Model 8550/8551 Specifications (continued) Level Windows: ±800mV, for amplitude from 10.0mV to 99.9mV; ±8V, for amplitude from 100mV to 16.0V. Output Protection: Protected against continuous short to case ground. Offset Resolution: 3 digits Range: Offset and amplitude are independently adjustable within level windows of ±800mV and ±8.00V.

  • Page 18: Control Characteristics

    Marker Output: Same as in logarithmic sweep. Stop Sweep Resolution: Same as Frequency resolution. CONTROL CHARACTERISTICS Modes: VCO, AM, FM (Model 8550), PWM (Model 8551) Input: Via front panel CONTROL INPUT BNC connector. Impedance: 10KΩ, ±5%. Max Input Voltage: ±10V.

  • Page 19: Pwm Characteristics

    Pulse Width Range: 10.0ns to 999ms Setting Accuracy: ±(5%+2ns), 10.0ns to 99.9ns; ±(4%+2ns), 100ns to 999ms. Duty Cycle Range: 1% to 8550%, up to 99% using complement mode. Resolution: 3 digits. Ramp Modes: Positive or Negative going ramps. Ramp Period Range: 7.000µs to 99.99s.
  • Page 20 Table 1-1. Model 8550/8551 Specifications (continued) LEAD/TRAIL TIME CONTROL (Model 8551 only) Range: 8ns to 99.9ms (10% to 90% of amplitude), in 6 overlapping ranges. Leading and trailing edges may be independently programmed within a common range. In-Range Span: 125:1.
  • Page 21 This page intentionally left blank 1-8 General Information...

  • Page 22: Introduction

    Vac (115 Vac, NOMINAL) b. 207 to 253 Vac (230 voltage to rms) should be typically Vac, NOMINAL) Tabor ships the Model 8550 set for within the range of 1.3 to 1.6 at 10% the line voltage and with the proper fuse for the of the nominal rms mains voltage.

  • Page 23: Grounding Requirements

    To change the line voltage, disconnect the power frequency rating which limits the leak- cord from the Model 8550, slide the Line Select age current between case and power switch (Figure 2-1) to the desired line voltage. Also mains. Never expose the instrument be sure to change the fuse;...

  • Page 24: Long Term Storage Or Re-Packing For Shipment

    Close box in accordance with con- on two sides of the box; cover all previous shipping tainer specifications. Seal with sturdy water resistant labels. tape or metal straps. Figure 2-2. Model 8550/8551 - Outline Dimensions. Preparation 2-3...

  • Page 25: Safety

    7. Mark container “DELICATE INSTRUMENT”, work authorization order as well as “FRAGILE”, etc. Mark instrument model and serial the date and method of shipment. number and date of packaging. Affix shipping labels ALWAYS OBTAIN RETURN as required or mark according to MIL-STD-129. AUTHORIZATION NUMBER FROM THE FACTORY BEFORE SHIPPING THE INSTRUMENT TO Tabor.

  • Page 26: Introduction

    IEEE-488 the switch a second time turns the power off. operation. Basic bench operation, which is covered in this section, explains how to use the model 8550 2nd/EXE - Several push-buttons were assigned for generating the required waveform characteristics.

  • Page 27: Phase Offset

    SYNC output connector. The amplitude parameter may be programmed within the range of PLL - The Model 8550 output may be locked to 10.0mV to 16.0V. Preset value is set to 1.00V. an external signal. The operator may then introduce...

  • Page 28: Main Parameters - Model 8551

    Amplitude control has no effect on the amplitude duty cycle mode. The duty cycle parameter may be level at the SYNC output connector. The amplitude programmed within the range of 1% to 8550%. parameter may be programmed within the range of Preset value is set 50%.

  • Page 29: Trigger Mode

    The trigger phase offset parameter The connectors are used for connecting the Model may be programmed within the range of ±90°. Preset 8550 to the unit under test, to a control device, and value is set to 0°. to an external triggering stimulant.

  • Page 30: Default State

    ST. BY Output Stand By On (no output) function generator. Model 8550 accepts VCO, am- of delivering up to 32Vp-p. For safety reasons, after plitude and frequency modulating signals, while Model power on or after software reset, the OUT connector 8551 accepts additional pulse width modulating signal.

  • Page 31: Rear Panel Familiarization

    3-4. POWER-UP PROCEDURE automatically monitors front panel traffic and retains its latest set-up for events such as accidental power The basic procedure of powering up the Model 8550 loss. In case of power loss the instrument resumes is described below.

  • Page 32: Software Reset

    3-7. DETECTING PROGRAMMING ERRORS set-up. repeating the sequence of Model 8550 is a product of many years of experience [2nd] and [Operating Mode ⇑] restores and complete understanding of human engineering normal power up procedure. Note requirements.

  • Page 33: Limit Errors

    In general, whenever a GPIB programming attempts There are ten front panel buttons which were to put the model 8550 into an error condition, the assigned a secondary function. These functions are: function generator responds in two ways. First by...

  • Page 34: Auto-Calibration

    8.00V Model 8550 only STP (log sweep stop) 10.00mHz 50.00MHz Model 8550 only SSN (lin sweep stop) 10 display counts 5000 display counts Model 8550 only SWT (sweep time) 10ms 999s Model 8550 only MRK (log marker freq) 10.00mHz 50.00MHz...

  • Page 35: Reviewing The Auto-Calibration Failure List

    (Offset) 3-11. REVIEWING THE AUTO-CALIBRATION PHASE (PLL offset - Model 8551) FAILURE LIST Sweep parameters (Model 8550 only): As discussed above, if the auto-calibration fails to successfully complete, the instrument automatically STOP (Sweep stop frequency) generates a failure list. The operator can review this...

  • Page 36: Using The Modifier

    3-13-2. Linear/Logarithmic Sweep Operating the third and the fourth (most significant) digit. Mode - Model 8550 Placing the model 8550 in linear or logarithmic sweep 3-12-2. Modifying the Range operating mode transforms the instrument into an independent sweep generator. The function generator The [RANGE] buttons control the range of the dis- played parameter.

  • Page 37: Phase Locking Generator Operating Mode - Model 8550

    A on an oscilloscope. at the stop frequency. Following another trigger, the 5. Connect a BNC cable from 8550 output to above cycle is repeated. In normal mode the generator channel B on the oscilloscope.

  • Page 38: Using Model 8550 As A Frequency Counter

    Frequency reading is given with fixed resolution of operating mode. 4 digits. Decimal point and exponent are displayed automatically. To use Model 8550 as a frequency 3-13A-2. Pulse Generator With Variable Pulse counter proceed as follows: Width Operating Mode - Model 8551 1.

  • Page 39: Phase Locking Generator Operating Mode - Model 8551

    To generate phase offset proceed as follows: The duty cycle may be selected within the range 1. Repeat the operating instruction as in the previous of 1% to 8550%, however, this range may be paragraph. extended to almost 99% by using the pulse com- 2.

  • Page 40: Selecting A Modulation Mode

    2. Depress the operating mode push-buttons until the AM input modulating signal. Model 8550 is placed the light behind PLL illuminates. in its AM mode when the light behind AM illuminates.

  • Page 41: Disabling The Output

    3-17. TRIGGERING THE FUNCTION 3-17-1-2. Gated Mode GENERATOR Model 8550/8551 when set to one of its trigger When set to operate in gated mode, the first positive modes accepts stimulation from a variety of sources. going transition at the TRIG/REF INPUT connector The Operator has the option of selecting either an enables the generator output.

  • Page 42: Counted Burst Mode

    sure to observe external signal limits to avoid damage to the input circuit. 7. When done with the counted burst operation NOTE remove the BNC cable from the input connector and The TRIG/REF INPUT connector is select the normal continuous mode. sensitive to dc levels.

  • Page 43: Using The Offset

    TRIG’D (triggered) mode, each time the MAN button is depressed a single output waveform is generated. 3-19-1. Storing Set-ups When the Model 8550/8551 is set to generate a counted burst, each time the MAN push-button is First modify front panel parameters as necessary to depressed the output generates a train of counted perform the required test.

  • Page 44: Using The Recall Mode

    3-21. CHANGING EMULATION MODE TO HP the desired cell number is displayed. Depressing [EXE] updates front panel set-up with the parameters Models 8550 and 8551 can be made fully compatible which were stored in the selected memory cell. with HP Model 8116A device-dependent commands 3.
  • Page 45 This page intentionally left blank 3-20 Operating Instructions...

  • Page 46: Gpib Operation

    2. Information necessary to connect the Model adopted by the IEEE (Institute of Electrical and 8550 to the bus and to change the bus address is Electronic Engineering) in 1975 and given the IEEE- contained in paragraphs 4-6 and 4-7.

  • Page 47: Ieee-488 Bus Lines

    Figure 4-1. IEEE Bus Configuration Any given system can have only one controller mation, and the appropriate software is then be used (control may be passed to an appropriate device to channel the information to the desired location. through a special command). Any number of talkers or listeners may be present up to the hardware 4-3.

  • Page 48: Handshake Lines

    Figure 4-2. IEEE Handshake Sequence 3. REN (Remote Enable) - Setting the REM line The complete handshake sequence for one data low sends the REM command. This sets up instru- byte is shown in Figure 4-2. Once data is on the ments on the bus for remote operation.

  • Page 49: Data Lines

    SH - (Source Handshake Function) - The ability not have a controller function. for the Model 8550 to initiate the transfer of mes- TE - (Extended Talker Capabilities) - The Model sage/data on the data bus provided by the SH 8550 does not have extended talker capabilities.

  • Page 50: Hardware Consideration

    DIO8 Data The simplest possible controlled system comprises Management a controller and one Model 8550. The controller is 18-24 Ground used to send commands to the instrument, which sends data back to the controller.

  • Page 51: Bus Commands

    REN - (Remote Enable) - The remote enable commands, which are grouped into the following command is sent to the Model 8550 by the controller three categories: to set the instrument up for remote operation. Gen- Table 4-3.

  • Page 52: Universal Multiline Commands

    The Model The REN bus line must be true before 8550 will indicate that it is in the remote mode by the instrument will respond to an LLO illuminating its front panel REM indicator. To place command.

  • Page 53: Addressed Commands

    Al- taneously. Model 8550 will return to the default though GET is considered to be an addressed conditions listed in Tables 3-1 and 4-4 when re- command, many devices respond to GET without sponding to an SDC command.

  • Page 54: Device Dependent Commands

    For example, M2 is sent to the Model 8550 the device will follow when the Group Execute Trigger to place the instrument in the external trigger mode.

  • Page 55: Separator Functional Element Summary

    <Program Message> Represents a sequence of zero or more <Program Message Unit> elements 4-9-2. Separator Functional Element Summary separated by <Program Message Unit Terminator> The various elements within the <Program Message> elements. are separated by ASCII characters that were specially <Program Message Unit>...

  • Page 56: Command Program Header

    <Compound Query Program Header> is not are permitted. The instrument interprets any and all used in model 8550 and will not be discussed here. of the three terminators as semantically equivalent. A <Common Query Program Header> is defined as: No alternative encoding are allowed.

  • Page 57: Non-Decimal Numeric Program Data

    3. Set certain bits in its status registers. 4. Generate an SRQ if programmed to do so. The <Non-Decimal Program Data> functional element is not implemented in Model 8550. Therefore it shall Device-dependent programming aspects are cov- not be discussed in this manual.

  • Page 58: Device-Dependent Command Summary

    Stop to start to stop (down-up) TRIGGER MODES Normal continuous mode External Trigger External Gate External Burst Internal Trigger Internal Burst CONTROL MODES FM (Model 8550) PWM (Model 8551) OUTPUT WAVEFORMS DC (Model 8550) Sinewave Triangle Squarewave Fixed base-line positive squarewave Fixed base-line negative squarewave...
  • Page 59 NS, US, MS, S Program internal trig. generator per. NS, US, MS, S Program counted burst Program trigger level Program trigger phase offset (Model 8550 only) Program dc output level MV, V (Model 8550 only) Program logarithmic sweep stop MHZ, HZ, KHZ, MAHZ...

  • Page 60: Response Message Format

    Interrogate trailing edge transition time RPT? Interrogate internal trig. generator period BUR? Interrogate counted burst TLV? Interrogate trigger level TPH? Interrogate trigger phase offset (Model 8550) DCO? Interrogate dc output level (Model 8550) STP? Interrogate logarithmic sweep stop (Model 8550) SWT? Interrogate sweep time...
  • Page 61 Table 4-5. Device-Dependent Command Summary (continued) Mode Program Header and Data Description COMMON QUERIES *CAL? Calibration query *ESE? Standard event status enable query *ESR? Standard event status register query *IDN? Identification query *OPC? Operation complete query *SRE? Service request enable query *STB? Read status byte query *TST?

  • Page 62: Sweep Direction (S)

    Program the Model 8550 to one of the control modes F0 = Normal operating mode by sending one of the following commands: F1 = Linear sweep mode CT0 = Normal operating mode F2 = Logarithmic sweep mode CT1 = FM mode (model 8550 only)

  • Page 63: Parameter Programming

    The display parameter command controls what the Model 8550 places on the display. The display For an example, to program the model 8550 for parameter mode may be programmed by sending a frequency output of 10.7 MHz, the following <pro- one of the following commands.

  • Page 64: Common Commands

    - model 8551 only (09) listed in Table 4-6. The following set of common VRPT = Display internal trigger generator period commands are utilized in the model 8550 (optional parameter common commands that are not included in the VBUR =...

  • Page 65: Set-Ups (*Sav, *Rcl)

    Model 8550 may diagram and the needs of the device. The functional store settings in registers designated with numbers elements include separators, terminators, headers, from 00 to 30.

  • Page 66: Separator Functional Element Summary

    <Response Message Unit Separator> is defined as: lence. <Compound Response Header> is not used in model 8550 and will not be discussed here. A <Common Response Header> is defined as: 4-11-2-2. Response Data Separator *<Response Mnemonic>...

  • Page 67: Decimal Numeric Response Data

    4-12. READING FROM THE MODEL 8550 of the instrument. When the interrogate parameter data query is given, the Model 8550 will transmit The reading sequence is used to obtain, from Model appropriate data string information the next time the 8550, various <Response Message Units>...

  • Page 68: Common Queries

    (see paragraph utilized in the model 8550 (optional common queries 4-12-4). that are not included in the model 8550 command set will not be discussed here). section. The calibration query does not require any local operator interaction to function. Upon completion...

  • Page 69: Response Header (X)

    The <Response Message Terminator> in model model 8551 response *IDN? 8550 may be programmed by sending one of the bor,8551,0,REV1.1. following commands: *OPC? (Operation Complete Query) - causes the Z0 = New Line (LF), END (EOI) terminator device to generate the operation complete message...

  • Page 70: Ieee-488.2 Status Reporting Model

    Figure 4-3. IEEE-488.2 Status Reporting Model GPIB Operation 4-25...

  • Page 71: Reading The Status Byte Register

    The value of the status byte is not altered by a Byte A (FSA) have occurred. The FSA summary- serial poll. Once the model 8550 has generated an message is true when a calibration error was have RQS, its status byte should be read to clear the been detected.

  • Page 72: Service Request Enable Register

    Bit 1 - Request Control. This bit operation is 8550 to issue a service request by altering the disabled on model 8550. contents of the Service Request Enable Register.

  • Page 73: Calibration Failure Status Registers Interpretation

    Thus, the application programmer can select reasons The Calibration Failure Status Registers FSA, FSB, for the model 8550 to issue a ESB summary-message an FSC are a special application of the status bit by altering the contents of the ESE Register.

  • Page 74: Pulse/Ramp Error Status Register (Err)

    There are no enable registers for the Calibration occurred. This error bit is set true under the following Failure Registers which are available for the pro- conditions: grammer. Thus, whenever a calibration error occurs, Pulse Width > 0.8 x Period the information is immediately fed to the Status Byte Register.

  • Page 75: Machine Status Register (Stt)

    4-15-1. ILI (Illegal Instruction) Error GPxx An ILI error results when the Model 8550 receives an invalid <Program Header> such as AMPL1.00. Where x may be any number from 0 to 30. This command is invalid because the real command should read AMP1.00.

  • Page 76: Hp's Model 8116A - Mode/Parameter Messages

    Select PWM (Model 8551 only) Select VCO Haversine (−90°) Trigger Slope Off (Not used in Model 8550/8) Positive slope (Not used in Model 8550/8) Negative slope (Not used in Model 8550/8) Waveforms Off (dc) (Model 8550 only) Select sine Select triangle...
  • Page 77 NS = Nonoseconds Set repetition rate for internal burst US = Microseconds MS = Milliseconds MZ = Millihertz Set sweep start frequency (Model 8550) HZ = Hertz KHZ = Kilohertz MHZ = Megahertz MZ = Millihertz Set sweep stop frequency (Model 8550)
  • Page 78 Bit 7 Service request Bit 8 Buffer not empty (Not used in 8550/8551) (*) Engineering notations can not be used in combination with delimiters. For example, the following com- mand will result in an error message: FRQ 1.000E+3KHZ. Use either engineering notation or delimiters only.
  • Page 79 This page intentionally left blank. 4-34 GPIB Operation...

  • Page 80: Introduction

    5-1. INTRODUCTION 5-3. FUSE REPLACEMENT This section provides maintenance, service informa- The Model 8550 has a line fuse to protect the tion, and performance tests for the models 8550 and instrument from excessive current. This fuse may be 8551. Fuse replacement procedure, line voltage se- replaced by using the procedure described in the lection and disassembly procedure are also included.

  • Page 81: Special Handling Of Static Sensitive Devices

    Tests should be performed under laboratory conditions having an ambient temperature of 25° ±5°C and a Model 8550 should be cleaned as often as operating relative humidity of less than 8550%. If the instrument condition require. Thoroughly clean the inside and has been subjected to conditions outside these the outside of the instrument.

  • Page 82: Warm-Up Period

    Gated of drift when it is first turned on. To ensure accuracy, −10 V Trigger Level turn on the power to the Model 8550 and allow it Output Squarewave to warm-up for at least 30 minutes before beginning the performance tests procedure.

  • Page 83: Frequency Accuracy - Continuous Mode

    Output Squarewave 2. Set counter to frequency measurement. 5-9-4. DC Characteristics 3. Connect 8550 output to counter input. Set 8550 frequency and verify counter frequency reading as Accuracy specifications: ±(1% of setting + 1% of follows: amplitude + 2 mV), within ±8 V; ±(1% of setting + 1% of amplitude + 0.2 mV), within ±800 mV...

  • Page 84: Sine Characteristics

    10µs and 4 V positive pulse and connect its output 4. Change 8550 amplitude setting to 10.0 V. to the 8550 TRIG IN BNC connector. Set oscilloscope 5. Connect 8550 output to spectrum analyzer input and verify on the oscilloscope that 8550 outputs a through a 20dB feedthrough attenuator.

  • Page 85: Internal Trigger, Burst Characteristics

    2. Set oscilloscope and verify on the oscilloscope and verify that you get a single sinewave waveform that 8550 outputs a burst of two complete output on the oscilloscope every time that the [MANUAL] waveforms. Remove external pulse generator con- push-button is depressed.

  • Page 86: Pll Phase Offset Accuracy Check

    Observe that the base line is at the −3 division 5. Set 8550 PLL phase offset and verify the following line ±1 small grid lines. accuracy requirements: 5. Change 8550 Start-Trigger Phase Offset to +90°...

  • Page 87: Phase Lock Loop Operation Check

    Figure 5-2. Phase Lock Loop Operation Check. 10.00000 MHz 1.0000000 1. Set 8550 as follows: 20.00000 MHz 1.0000000 30.00000 MHz 1.0000000 CONTROL POSITION 40.00000 MHz 1.0000000 MOD Mode 50.00000 MHz 1.0000000 Frequency 1 MHz 60.00000 MHz 1.0000000 Amplitude 2. Connect test set-up as described in Figure 5-3.
  • Page 88 1. Set 8550 as follows: Sweep and repeat the above tests. 8. Change 8550 Trigger Mode to Triggered. Observe CONTROL POSITION that 8550 output sweeps once for every time that MOD Mode the [MANUAL] push-button is depressed. Frequency 999.9 KHz 9.

  • Page 89: Rise/Fall Time Accuracy Tests

    2.000 µs 1.00 µs 500 ns 478 ns - 522 ns 20.00 µs 10.0 µs 5.00 µs 4.8550 µs - 5.20 µs 200.0 µs 100 µs 50.0 µs 48.0 µs - 52.0 µs 500 µs 480 µs - 520 µs 2.000 ms...

  • Page 90: Theory Of Operation

    The output amplifier circuit This section contains an overall functional description is capable of driving its output waveforms into a of the 8550 series function generators as well as 50Ω load. detailed circuit analysis of the various sections of the instruments.

  • Page 91: Model 8550/8551 - Simplified Block Diagram

    Figure 6-1. Model 8550/8551 - Simplified Block Diagram 6-2 Theory of Operation...
  • Page 92 The counter circuit is employed in the Model 8550/8551 for the purpose of controlling the accuracy At this time, the reference voltage at the negative of the frequency at the output connector. The counter input of the comparator is switched to -1.2 V by...
  • Page 93 U15a, Q22, U18, Q18, modes for the Model 8550/8551: continuous mode, U17, and Q21. triggered mode, gated mode, and counted burst mode. Refer to the schematic diagrams at the end The calibration board also produces a voltage of this manual throughout the following description.
  • Page 94 A trigger signal resets U16a and U16b enables 6-5-1. Reference Circuit the VCO, however, because the “D” input of U16a The reference circuit provides accurate and controlled is now set to logic level “0", the pulses from the voltage references for adjusting and calibrating the VCO cannot set U16a to logic level ”1"...
  • Page 95 Output Am- plifier board. The circuits that are discussed here Model 8550/8551 is capable of locking on an external are: the pulse shaper circuit, the waveform selector signal and automatically adjust itself to the frequency circuit, the amplitude modulator circuit, the step at- and the phase of the external signal.
  • Page 96 U14, a buffer made of Q8 connector, the second is to modulate the carrier and Q9, and their associated components. signal which is generated by the Model 8550/8551 The operational amplifier U15 and resistors R68, with an external modulating signal.

  • Page 97: Main Board

    The pulse generator board has the necessary circuits are used on Models 8550 and Model 8551. The for generating pulses and ramps with variable pulse various parts that are laid on the main board are width and variable rise and fall times.
  • Page 98 6-8-2. Pulse Width Current Generator Circuit made of U1a, Q1, and their associated components. The ±1.5 voltage limits are referenced to the -5 V The current generator is controlled by a digital to reference voltage on the main board. analog converter U24 which receives its controlling signals from the CPU board and by an operational The generated squarewave with its linear transition amplifier U23.
  • Page 99 This page intentionally left blank 6-10 Theory of Operation...
  • Page 100 To ensure long-term the 8551 pulse/function generator. calibration accuracy, turn on the power to the Model 8550/8551 and allow it to warm-up for at least 30 minutes before beginning the adjustment procedure. WARNING The procedures described in this sec- 7-2-3.

  • Page 101: Adjustment Procedure

    Equipment: DMM Perform the following adjustment procedure. If an 1. Connect 8550/8551 output to DMM input as shown adjustment can not be made to obtain a specific in Figure 7-2. Set DMM to DCV measurements and result, refer to the troubleshooting procedures.

  • Page 102: Connection - Sine Level Adjustment

    R91 for best pulse flatness. response. 9. Change 8550/8551 frequency setting to 1.000 4. Change 8550/8551 amplitude setting to 1.00 V. KHz and readjust R91 for best flatness in this range. Set oscilloscope vertical gain and adjust output board 10.
  • Page 103 7-3-5. Ramp Base-Line Adjustment (Model 8551) Equipment: Synthesizer Equipment: Oscilloscope 1. Change 8550/8551 trigger level setting to 0.0 V. 1. Leave Model 8551 connected to the oscilloscope as was shown in Figure 7-4. Change Model 8551 2. Set synthesizer frequency to one of the following output setting to ramp.

  • Page 104: Troubleshooting

    DIAGNOSTICS FUNCTION FAIL d An advanced feature of the Model 8550/8551 is its self-diagnostics capability. This feature helps in re- ducing troubleshooting time of faulty circuits to mini- Where d represents a blinking digit in the range mum.

  • Page 105: Output Amplifier Board

    One may examine the full list of calibration failures associated displayed readout. In general, amplitude immediately after a self-calibration program was exe- failures may generate as a result of faults in the cuted, or at any later time provided, however, that V.C.O., calibration, pulse width, and output amplifier the *CLS common command was not used before boards.
  • Page 106 Check U8, Q14, R73, R82, and R83 on 7-5-6. Counted Burst Calibration Failures the output amplifier board. Failures in the counted burst circuit is indicated by a blinking TRIG BUR indicator with an associated 7-5-4. Phase Lock Offset Calibration Failures displayed readout.

  • Page 107: Power Supply Checks

    FAIL 2 - Check C9, K1, Q7, and their associated It is highly suggested that the first step in trou- components. bleshooting the Model 8550/8551, as well as any FAIL 3 - Check C4. similar equipment, would be to check the power FAIL 4 - Check C3, Q6 and their driving circuit.

  • Page 108: Digital Circuitry And Display Checks

    the reference voltage to the +5 V. Therefore, it would readings. Problems in the clock generator for the be impossible to troubleshoot the +5 V supply if the C.P.U. and the digital circuit may cause a complete +15 V supply is defective. Similarly, the +5 V supply malfunction of the entire section.
  • Page 109 This page intentionally left blank 7-10 Adjustments and Troubleshooting...

  • Page 110: Parts List

    Tabor part number. the schematic and the assembly drawings, in places d) Part description. where part description does not match. e) Circuit designation (where applicable). Table 8-1. Model 8550/8551 - List of Vendors Vendor Address CAGE Code Amphenol Products...

  • Page 111: Model 8550/8551 - Parts List

    13500N. Central Expressway, Dallas TX 75265 01295 14520 Aviation Blvd., Lawndale CA 90260 0128551 Wavetek-Datron 9045 Balboa Avenue, San Diego CA 92123 23338 Table 8-2. Model 8550/8551 - Parts List Reference Description and Tabor Qty Designation Commercial Part Number Part Number...
  • Page 112 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code BEAD Ferrite CERAMAG24 57-1355 4200-00000 59821 TSTR J-309 0400-02510 17856 TSTR 2N5210 0400-01910 04713 Q3,Q4,Q9,Q10 TSTR PN3904 0400-01200 04713 Q5- Q8 TSTR 2N5179 0400-00700...
  • Page 113 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code R6,R12,R15-16,R22, R24-28,R35,R37-40, R44-46 RES MF 10K 1% 1/4W 0104-10020 74902 R106 RES MF 12.5K 1% 1/4W 0104-12520 74902 RES MF 20K 1% 1/4W 0104-20020 74902 R1,R42...
  • Page 114 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code 7 SEG LED HDSP 7801 1200-11100 50434 ±1 LED HDSP 7807 1200-11200 50434 DS7,DS15,DS25,DS29, DS32,DS35 MINI 3MM LED RED HLMP1301 1000-00300 50434 DS8-14,DS16-24,DS26-...
  • Page 115 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code RES MF 8.66K 1% 1/4W 0104-86610 74902 R10-R13,R17,R21,R30 RES MF 10K 1% 1/4W 0104-10020 74902 R16,R18,R31,R32 RES MF 20K 1% 1/4W 0104-20020 74902 AUDIO TRANSDUCER AT-02...
  • Page 116 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code J1,J2 CON FEMALE 2X8 90152-2216 3000-30520 27264 J3,J4 CON RF MALE131-1701-201 3000-16000 74970 K1-K5 RELAY RY-05WK-R10 0900-00700 55101 L1-L6,L9-L15,L17-L18 BEAD Ferrite CERAMAG24 57-1355 4200-00000 66958...
  • Page 117 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code R57,R121 RES MF 249 1% 1/4W 0104-24900 74902 R10,R11 RES MF 442 1% 1/4W 0104-44200 74902 R31,R32 RES MF 499 .1% 1/4W 0105-49900 74902 R35,R36...
  • Page 118 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code C5-C8 CAP ELEC 100µ 25V 2222.036 1533-01070 59821 CAP ELEC 100µ 16V 2222.013 1532-0107P 59821 CAP CER 22P SR155C220MAA 1500-02200 96095 CAP CER 33P SR155C330MAA...
  • Page 119 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code RES COMP 4.7K 5% 1/4W 0100-04720 74902 R1,R2,R19,R95,R97,R62 RES COMP 10K 5% 1/4W 0100-01030 74902 RES COMP 1M 5% 1/4W 0100-01050 74902 R71,R85...

  • Page 120: Cpu Board

    Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code COMPARATOR MAX9690CPA 0500-60950 1ES66 OP AMP LM 741C 0500-56310 04713 ANALOG SWITCH DG411CJ 0500-91000 17856 DUAL OP AMP TL082CP 0500-56600 04713 CPU Board Assembly...
  • Page 121 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code C27,C47,C48,C49 CAP CER 10n SR155C103KAA 1500-01030 96095 C13-14,C17-20,C28-29, C32-33,C37-38,C40,C42, C43-45 CAP CHIP 0.1µ C0805A104Z5AC 1560-01040 31433 CAP CER 0.1µ SR155C104ZAA 1500-01040 96095 CAP POLY 4.7n 63V 2222.371.52472 1522-04720...
  • Page 122 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code R132 RES COMP 47 5% 1/4W 0100-04700 74902 RES COMP 51 5% 1/8W 0102-05100 74902 R137 RES COMP 82 5% 1/4W 0100-08200 74902 R52,R73,R74,R87,R93,...
  • Page 123 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code RES MF 1.1K 1% 1/4W 0104-11010 74902 RES MF 1.13K 1% 1/8W 0102-1131A 74902 R20,R34 RES MF 1.87K 1% 1/8W 0102-1871A 74902 RES MF 2 K .1% 1/4W...
  • Page 124 Table 8-2. Model 8551 - Parts List (continued) Reference Description and Tabor Qty Designation Commercial Part Number Part Number Vendor Code Rear Panel Assembly 6100-6280 23338 MAINS TRANSFORMER 2500-05000 23338 MAINS RECEPT & FILTER 3EEA1 3000-20500 61935 CON GPIB 57FE-2 0240-20ND35 3000-40300 03554 SW LINE SELECT EPS1SL1...
  • Page 125 This page intentionally left blank 8-16 Parts List...
  • Page 126 Schematic Drawings Section 9...

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