MODEL 333A/334A DISTORTION ANALYZER - pascalchour.fr

1 OPERATING AND SERVICE MANUAL HEWLETT PACKARD L @Copyright Hewlett-Packard Company 1966 Box 301, Loveland, Colorado, 80537 Reproduced with Permission, Courtesy of Agilent Technologies, Inc. MODEL 333A/334A DISTORTION ANALYZER Serial Numbers: 333A: 1137A03146 and greater 334A: 1140A05641 and greater Appendix C, Manual Backdating Changes, adapts this manual to lower serial numbers. WARNING I To help minimize the possibility of electrical fire or shock hazards, do not expose this instrument to rain or excessive moisture. Manual Part NO. 00333-90008 Microfiche Part No. 00333-90058 prlnttd: October 1975,1985 HEWLETT Pa PACKARD CERTIFICATION Hewlett-Packard Company certifies that this product met its published specifcations at the time of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States Na- tional Bureau of Standards, to the extent allowed by the Bureau s calibration facility, and to the calibration facilities of other International Standards Organization members.

2 WARRANTY This Hewlett-Packard product is warranted against defects in material and workmanship for a period of one year from date of shipment [,except that in the case of certain components listed in Section I of this manual, the warranty shall be for the specified period] . During the warranty period, Hewlett-Packard Company will, at its option, either repair or replace products which prove to be defective. For warranty service or repair, this product must be returned to a service facility designated by -hp. Buyer shall prepay shipping charges to -hp- and -hp- shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to -hp- from another country. Hewlett-Packard 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.

3 Hewlett-Packard does not warrant that the operation of the instrument, or software, or firmware will be uninterrupted or error free. LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance. DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HEWLETT-PACKARD SPECIFICALLY EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES. HEWLETT- PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSE- QUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY. ASSISTANCE Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packad products.

4 For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addnsscr are provided at the back of this manual. HEWLETT PACKARD SAFETY SUMMARY Tho following ganorol ufoty pneoutionr murt bo oburvod during all phrm of oporotior, urviw, and nprir of thir inrtrumont friluro to comply with thaw procautions or with rprcific warnings oluwhon in thir manual violotw rrfoty rtandrrdr of dosign, mrnufrcturo, and intondod uu of tho inrtrumont Howlott-PieLord Company assume8 no liability for tho curtomar'r foiluro to comply with thou roquinmont8. This is I Srfoty Class 1 inrtrumont GROUND THE INSTRUMENT To minimize shock hazard, the instrument chassis and cabinet must be connected to an elec- trical ground. The instrument is equipped with a three-conductor ac power cable. The power cable must either be plugged into an approved three-contact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmly connected to an electrical ground (safety ground) at the power outlet.

5 The power jack and mating plug of the power cable meet International Electrotechnical Commission (IEC) safety standards. DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard. KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified maintenance personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power and discharge circuits before touching them. DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present. DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards, do not install substitute parts or per- form any unauthorized modification to the instrument.

6 Return the instrument to a Hewlett- Packard Sales and Service Office for service and repair to ensure that safety features are main- tained. DANGEROUS PROCEDURE WARNINGS Warnings, such as the example below, precede potentially dangerous procedures throughout this manual. Instructions containe# in the warnings must be followed. WARNING I Dongarour voltagu, wprbla of wuring drth, on prwont in thir inrtrumont Uso ox. tnmo wution whon handling, twting, and rdjurting. A Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument. A Indicates dangerous voltage (terminals fed from the interior by voltage exceeding lo00 volts must be so marked). /s Protective conductor terminal. For protection against electrical shock in case of a fault. Used with field wiring terminals to in- dicate the terminal which must be connected to ground before 4 - OR@ operating equipment.

7 Low-noise or noiseless, clean ground (earth) terminal. Used for a signal common, as well as providing protection against electrical shock in case of a fault. A terminal marked with this symbol must .be connected to ground in the manner described in the installation (operating) manual, and before operating the equipment. D , Frame or chassis terminal. A connection to the frame (chassis) of /f;r OR 1, the equipment which normally includes all exposed metal struc- tures. Alternating current (power line). - - - - Direct current (power line). Alternating or direct current (power line). The WARNING sign denotes a hazard. It calls attention to a pro- cedure, practice, condition or the like, which, if not correctly per- 0 formed or adhered to, could result in injury or death to personnel. WARNING SAFETY SYMBOLS General Definitions of Safety Symbols Used On Equipment or In Manuals. The CAUTION sign denotes a hazard. It calls attention to an operating procedure, practice, condition or the like, which,if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product.

8 CAUTION The NOTE sign denotes important information. It calls attention to procedure, practice, condition or the like, which is essential to highlight. E ' MODEL 333A/334A TABLE OF CONTENTS Table of Contents Section Page I GENERAL INFORMATION .. 1-3 . Description .. 1-3 . Accessory Features .. 1-3 . Option .. 1-3 . Instrument Identification .. 1-3 Section 11 INSTALLATION .. 2 . 1 . Introduction .. Inspection .. Power Requirements .. Three-Conductor Power Cable .. 2 . 10 . Installation .. Bench Installation .. Rack Installation .. Repackaging For Shipment .. page 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1 Section -ge III OPERATINGINSTRUCTIONS .. 3-1 3- 1 . Introduction .. 3 . 1 . Controls and Indicators .. 3-1 . General Operating Information .. 3-1 . Input Connections .. 3-1 . Voltmeter Characteristic$ .. 3-1 . Output Terminals .. 3-2 . Operating Procedures.. 3-2 . Instrument .. 3-2 . Adjustment of Meter Mechanical Zero.

9 3-2 . DistortionMeasurement .. 3-2 . RF Carriers (334A only) .. 3-3 . Voltage Measurement .. 3-3 . Meter Indication .. 3-4 . Use of Output Terminals .. 3-4 . 333A1334A with Option 01 .. 3-4 . Manual Nulling .. 3-4 Section Page IV THEORY OF OPERATION .. 4-1 . Overall Description .. 4-1 . Block Diagram Description .. 4-1 . DISTORTION Measuring . Carriers.. 4-1 . Voltmeter Operation .. 4-1 . Detailed Circuit Description .. 4-1 . Impedance Converter Circuit . 4-1 . Rejection Amplifier Circuit .. 4-2 . High Pass Filter .. 4-5 . Meter Amplifier .. 4-5 . Power Supply Circuit .. 4-7 . RF Detector Circuit (334 Aonly) 4-7 Section Page . Introduction .. 5-1 . Required Test Equipment .. 5-1 DISTORTION Measurement of AM Operation .. 4 . 1 DISTORTION Measurement in AM V MAINTENANCE .. 5-1 Section Page V MAINTENANCE (Cont d) .. 5-1 . Performance Checks .. 5-1 . Fundamental Rejection Check . 5-1.

10 Second Harmonic Accuracy .. 5-2 . Instrument Induced DISTORTION Check .. 5-2 . Frequency Calibration Accuracy Check .. 5-3 . Automatic Nulling Mode Check 5-4 . Input Impedance Check .. 5-4 . Minimum Input Level Check .. 5-5 . DC Isolation Check .. 5-5 . Voltmeter Accuracy and Frequency Response Check 5-6 . High Pass Filter Check .. 5-7 . Residual Noise Check .. 5-7 . AM Detector Check ( MODEL . Adjustment and Calibration Procedure .. 5-8 . Adjustments .. 5-8 . Voltmeter Gain Adjustments . 5-8 . Voltmeter Frequency Response Adjustment .. 5-10 . Bridge Balance Adjustment .. 5-10 . Sensitivity SwitchCalibration . 5-11 . Components .. 5-11 334 Aonly) .. 5-7 Power Supply and Bias Adjustment of Factory Selected . Troubleshooting Procedure .. 5-11 5 .38 . Troubleshooting Voltmeter Function .. 5 . 12 . Troubleshooting DISTORTION Function .. 5-14 . Photoresistor Check and Adjustment (A6V1 thruA6V5).