boonton_92ea_100mhz_1,2ghz_rf_mv-meter_sm 电路图.pdf

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1、C P C INSTRUCTION MANUAL MODEL 92E RF. MILLIVOLTMETER BOONTON ELECTRONICS CORPORATION 791 ROUTE 10, RANDOLPH, NJ 07869 TELEPHONE: 201 - 584-1077 TWX: 710-986-8215 Part No. 982012-OOA Printed in U.S.A. 6/85 _-. - _ . -.-.- _ -.-.-.-_ RadioFans.CN 收音机爱 好者资料库 SAFETY SUMMARY The following general safety

2、 precautions must be observed during all phases of operation and maintenance of this instrument. Failure to comply with these precaution or wsith specific warnings elscw!here in this manual violates safety standards of design, manufacture. and intended use of the instrument. Boonton Electronics assu

3、mes no liability for the customer!, failure to comply with these rcquirement. THE INSTRUMENT MUST BE GROIINDED To minimize shock hazard the instrument chassis and cabinet must be connected to an electrical ground. The instrument is equipped with a three conductor, three prong ax. power cable. he pow

4、er cable must either he plugged into an approved three-contact electrical outlet or used with a three-contact to a two-contact adapter with the (green) grounding wire firmly connected to an electrical ground at the power outlet. DO NOT OPERATE THE INSTRUMENT IN AN EXPLOSIVE ATMOSPHERE. Do not operat

5、e the instrument in the presence of llammable gases or fumes. KEEP AWAY FROM LIVE CIRCUITS. Operating personnel must not remove instrument covers. Component rcplaccment and internal adjust- ments must be made by quailfied maintenance personnel. Do not replace components with the powercable connected

6、. Under certain conditions dangerous voltages may exist een though the power cable was removed. therefore; always disconnect power and discharge circuit5 before touching them. DO NOT SERVICE OR ADJUST ALONE. Do not attempt internal service or adjustment unless another person. capable ot rendering fi

7、rst aid and resuscitation. is present. DO NOT SlJBSTITZJTE PARTS OR MODIFY INSTRUMENT. Do not install substitute parts or perform any unauthori/cd modification of the insturment. Kctul-n the instrument to Boonton Electronics for repair to ensure that the :itct lectures arc maintained. SAFETY SYMBOLS

8、. A 1 j WARNING 1 4 This safety requirement sJ,mbol (located on the rear panel) has hcen adopted by the International Electrotcchnical Commission. Document 66 (Central Oftice) 3. Para- graph 5.3. wchich directs that and instrument be so labeled if. for the correct use of the instrument, it is necess

9、ary to refer to the instruction manual. In this case it is recommended that reference be made to the instruction manual uhcnconnectingthe instrument to the proper power source. Vcr-if, that the correct fuse is installed for the power available, and that the switch on the rear panel is set to the app

10、licable operating voltage. T-he CAUTION sign dcnotcs a halard. It culls attention to an operation procedure. practice, or the like, w,hich, if not correctly performed or adhered to. could result in damage to or destruction of part or all ol the equipment. Do not proceed beyond a CAUTION sign until t

11、he indicated conditions arc fully understood and met. The WARNING signdenotesa ha/al-d. It callsattention toan operation procedure, practice. or the like, which, if not correctly performed or adhered to, could result in injury or loss of lift. Do not proceed beyond ;I WARNING sign until the indicate

12、d conditions are fully understood and met. Indicates dangerous voltages. RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS SECTION I - GENERAL INFORMATION C P L Paragraph Page l-l Introduction . . .1- 1 Safety Notice . l-1 l-2 Description . l-1 l-3 Accessories Furnished . 1-3 1-4 Options and Accessories Ava

13、ilable . 1-3 l-5 Compatibility of Accessories . 1-4 l-6 Specifications . 1-4 2-l 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 SECTION II - INSTALLATION AND OPERATION Installation . 2-1 Operating Controls and Indicators . 2-1 Safety Requirement Symbol . Initial Operating Procedures .;I z . Operating Notes . 3-2 .

14、 D.C. output . 2-4 Low Frequency Measurements . 3-5 . Correction Curves for Models 952003-OlA and 952007-OlA . 2-5 Interface Operation . 2-6 SECTION III - THEORY OF OPERATION 3-l Introduction . 3-l 3-2 Circuits: Detailed Discussion . 3-2 A. Sensor . 3-2 R. Chopper . 3-2 C. Amplifier . 3-2 D. Demodul

15、ator . 3-3 F A. Driver . 3-3 F. Clock . 3-3 G. Ranging and Programming - H. Shaping . .;-; I. Power Supply . 3-7 SECTION IV - MAINTENANCE 4-l Introduction . 4-l 4-2 Periodic Calibration . 4-l 4-3 Power Supply Checks . 4-l 4-4 Calibration Check . 4-1 4-5 Calibration Procedure . 4-2 4-6 Troubleshootin

16、g . 4-5 A. Cover Removal . 4-5 R. Replacement of R.F. Probes . 4-5 C. Probe Tests . .4- 5 1. S.W.R. Measurement . 4-5 2. Frequency Response . .4- 6 3. Swept Frequency Response and S.W.R. . .4- 7 i -I_.-.- RadioFans.CN 收音机爱 好者资料库 SECTION V - PARTS LIST Paragraph Page 5-l Introduction . . . . . . . .

17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-l SECTION VI - SCHEMATIC DIAGRAMS 6-l Schematic Diagrams, Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-l LIST OF ILLUSTRATIONS Figure l-l l-2 2-l 2-2 2-3 3-1 3-2 3-3 3-4 3-5 3-6

18、 4-l 4-2 4-3 Page Input Resistance of Model 92001-02A R.F. Probe . .l- 6 Input Capacitance of Model 92001-02A R.F. Probe . .l- 7 Assembly of Type N Tee Adapter . 2-3 Correction Curves for Type N Tee Adapters . .2- 5 Rear Panel Pin Assignments . 2-6 Simplified Block Diagram . 3-l Block Diagram: Ampli

19、fier Section . 3-3 Block Diagram: Demodulator and Driver . 3-4 Block Diagram: Ranging Circuitry . 3-5 Block Diagram: Shaping Section . 3-6 Block Diagram: Power Supply . 3-8 Adjustment Locations and Descriptions . 4-3 Frequency Response Test Setup . 4-6 Swept Frequency Response Test Setup . 4-8 LIST

20、OF TABLES Table Page l-l Crest Factors . l-7 2-1 Operating Controls, Indicators and Connectors . .2- 1 2-2 Connection Recommendations . 2-3 2-3 Rear Panel Pins: Unit Loadings and Comments . .2- 6 2-4 Interface Input Characteristics 5-l . 2-7 Applicable Federal Supply Code Numbers for Manufacturers 5

21、-2 . .5- 1 Replaceable Parts . 5-2 ii MOOEL 92E PROBE * ZERO - FUTL f&CM& - mV df3m 92E RF Millivoltmeter iii SECTION I GENERAL INFORMATION l-l. INTRODUCTION. This instruction manual provides general information, installation and operating instructions, theory of operations, maintenance instructions

22、, a parts lists, and schematics for the Model 92E. SAFETY NOTICE Although this instrument has been designed in accordance with international safety standards, general safety precautions must be observed during all phases of operation and maintenance of the instrument. Failure to comply with the prec

23、autions listed in the Safety Summary located in the front of this manual could result in serious injury or death. Service and adjustment should be per- formed only by qualified service personnel. l-2. DESCRIPTION A. General. The 92E R.F. Millivoltmeter provides an accurate readout of measurements fr

24、om the low radio frequencies to the gigahertz region, over a voltage range of 200 UV to 3 volts.* It is a programmable, solid state instrument of high sensitivity and accuracy, characterized by high input impedance (see Figures l-1 and l-2), excellent stability, and low noise. The 92E exhibits true

25、r.m.s. response for input signals up to 30 millivolts gradually approaching peak-to-peak above this 1evel.t The meter, however, is calibrated to indicate r.m.s. of a sine wave above 30 mV. Input and output connections for external control and readout are provided by a 22 pin card edge connector at t

26、he rear of the instrument. A linear d.c. output, the level of which is proportional to the r.f. input voltage, is also provided at a rear connector. This d.c. output may be used to drive a recorder, a remote indicator, or other analog devices. The instrument is sensitive, accurate, sturdily construc

27、ted, and protected against overloads. It will perform over extended periods of time without failure or need for recalibration. It is packaged as a compact bench in- strument that can be mounted easily in a standard 19 inch rack, using an optional rack mounting kit. B. Accessories Supplied. Standard

28、accessories supplied with the Model 92E include one each of the following: Model 952001-02A R.F. Probe with low noise cable and connector. Model 952002-OlA 50 Ohm BNC Adapter. Model 952004-OlA Probe Tip (removable), with grounding clip lead. C. Frequent m. The calibrated frequency range of the Model

29、 92E extends from 10 kHz to 1.2 GHz, with uncalibrated response to beyond 8 GHz. Relative accuracy* above 1.2 GHz is typically 20.5 dB. A 952002-018, 50 Ohm BNC Adapter, is supplied as a standard accessory with the instrument for 50 ohm voltage measurements up to 1.2 GHz. For through line voltage measurements the optional accessory 952003-OlA Tee Adapter is recommended. It is designed to compensate for the r.f. probe I _ - - - - - - - - - - - *To 300 V, up to 700 MHz, with accessory 1OO:l divider. tTo 3 V, up to 700 MHz, with accessory 1OO:l divider. l-l