BOONTON 92B Instruction 电路图.pdf

. ,I_ r” PU . 92B 1280 Instruction Manual Millivoltmeter TEL: 201- 887-5110 l TWX: 710-986-8241 499 POMEROY ROAD, PO BOX 122 PARSIPPANY, N. J. 07054 RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS CHAPTER I INTRODUCTION 1.1 GENERAL 1.2 EQUIPMENT DESCRIPTION 1.2.1 Frequency Capability 1.2.2 Voltaqe Capability 1.2.3 True RMS Response 1.2.4 Low Noise 1.2.5 Minimal Zero Adjustment 1.2.6 DC Output II SPECIFICATIONS III OPERATION 3.1 IIXSTALLATION 3.1.1 Operating Controls and Indicators 3.2 OPERATING PROCEDURES 3.2.1 Initial Operating Procedure 3.3 OPERATING NOTES 3.3.1 Overload Limits 3.3.2 Connection for Measurements Below 100 MHz 3.3.3 Connection for Measurements Above 100 MHz 3.3.4 Low-Level Measurement 3.3.5 Making the Zero Adjustment 3.3.6 Signal Overload on 1 mV Range 3.3.7 Temperature Effects 3.3.8 Hum, Noise, and Spurious Pickup 3.4 DC OUTPUT 3.5 LOW FREQUENCY MEASUREMENTS 3.6 CORRECTION CURVE FOR MODEL Pl-8B, 50 OHM ADAPTER 3.7 CORRECTION CURVE FOR MODEL Pl-14A, 50 Otlll TEE ADAPTER IV THEORY OF OPERATION 4.1 GENERAL 4.1.1 RF Probe 4.1.2 Attenuator and Amplifiers 320 1280 i PAGE - 12 12 12 13 13 14 14 14 14 15 16 16 16 17 17 17 17 17 19 19 19 20 RadioFans.CN 收音机爱 好者资料库 TARI,E OF CONTENTS (CONT INUW) CHAPTER -_- PAr;t. -._- , I 4.1.3 Cynchroous Detector 4.1.4 Shaping Amplifier 4.1.5 Chopper-Driver Circuits 4.1.6 Power Supply 4.1.7 Programming MAINTENANCE 22 5.1 PERIODIC CALIBRATION 22 5.2 PRECAUTIONS WIIEN CIIECKING CALIBRATION 22 5.3 CALIBRATION CflECK 23 5.4 CALIBRATIOJ PROCEDURE 23 5.5 TROUBLESHOOTING PROCEDURE 25 5.5.1 Cover Removal 25 5.5.2 Chopper Replacement 25 5.5.3 VOltSJe and KesiStanCe Tests 25 5.5.4 Test Points 26 5.5.5 Replacement of RI Probes 2 F, 5.5.6 Probe Tests 26 INTERFACE 32 6.1 INPUT CHARACTERISTICS 32 6.2 INPUT PULL-UP 33 6.3 ANtALCG OUTPUT 33 Inpu t Resistance of RF Probe as a Function of Input Leve 1 and Frequency 10 Input Capacitance vs Input Level of Zlodel 91-12F Probe (Pleasured at 10 MHz1 11 Typical SWR of Model 91-12F RI Probe with Model 91-8B 50 c Adapter 11 Typical SWR of Model 9l-12F RF Probe with Model 91-14A Type N Tee Adapter CIIARTS AND DRAWINGS 2 II 21 21 21 21 PAGE - and Model 91-15A 50 :2 Termination 11 Assembly of I.lodel 91-14A Type N Tee Adapter 15 Model 91-8B 50 9 BNC Adapter Correction Curve ia Model 91-14A Type N Tee Adapter Correction Curve 18 Block Diagram 19 Calibration Instructions 24 Frequency Response Test Setup 30 ii RadioFans.CN 收音机爱 好者资料库 a.“* CHARTS AND DRAWINGS (CONTINUED) FIGURE NO. -_ - 10 Swept Frequency Response Test Setup 11 Pin Designations 12 External Connections SCHEMATICS TABLES Required Accessories Crest Iactors Model 920 Controls and Indicators Connection Recommendations TABLE OF REPLACEABLE PARTS PAGE -_- 31 32 33 Endpapers PAGE 9 12 15 34 iii CFtAPT-ER I 1iJTRODUCTIO:S The Model 92 exhibits true rms response for input signals up to 30 millivolts, gradually approaching peak-to-peak above this level. The meter, however, is calibrated to indicate nns of a sine wave above 30 mV. Input and output connections for external control and readou t are provided by a 22-pin sard-eL1<lc connector at the rear of the instrument. 1.1 GENERAL The Elodcl 92 Series RF Millivoltmeter provides an accurate readout of measurements from the low radio frequencies to the gigahertz region, over a voltage range of 200 UV to 3 volts. It is a proqrammable, solid-state instrument of high sensitivity and accuracy, characterized by Iliqh input impedance (see Figures 1 and 2), excellent stability, and low noise. ;i linear dc output, whose level is proportional to the rf input voltage, is also provided .it a rear connector. This may be used to drive a recorder, remote indicator, or other analog .levices. The 92 offers a convenient and accurate means for making a wide variety of measurements. T:,I;ical uses of this instrument include: In transistor testing the instrument may be used to measure 0, ft, and other transistor parameters. SWR and return loss measurement using the Model 92 Series with bridge methods, directional couplers, and adjustable or slotted lines. aln and loss measurements in wide-band amplifiers, including such design characteristics is stage qain, flatness of the pass band, upper cut-off or corner frequency, negative feedback factors, and other parameters. Proper adjustment of tuned circuits in narrow-band amplifiers. The adjustment, measurement of performance, and evaluation of rf filter parameters. 92c 1280 1