Summary of Contents for Scientific Atlanta Quan-Tech 3158
- Page 1 INSTRUCTION MANUAL MODEL 3158 RESISTOR-NOISE TEST SET FOR SERIAL No. ® Div. of Scientific-Atlanta, Inc. � Specialists in Electron ic Instrumentation...
- Page 2 Verso Filler Page ♦ ♦...
- Page 3 RESIS TOR NOIS E TEST SET MODEL N O . SERIAL NO. OWNER PURCHASE ORDER NO. This manual is furnished under the contract for the supply of the QUAN-TECH instrument listed above and contains instructions for the operation and calibra tion of the instrument for its intended use_ The information contained in this manual shall not be either referred outside the owner's facility or used, duplicated,...
- Page 4 CLAIM FOR DAMAGE IN SHIPMENT The instrument should be tested as soon as it is received. If it fails to operate properly, or is damaged in any way. a claim should be filed with the carrier. A full report of the damage should be obtained by the claim agent, and this report should be forwarded to us.
- Page 5 TABLE OF CONTENTS Paragraph Paragraph Page Page & SECTION 1. GENERAL INFORMATION SECTION 5. PARTS LISTS CIRCUIT DIAGRAMS 1 · 1 . Intended use of the Model 315 B ..1 · 1 5- 1 . Scope .....
- Page 6 CAUTIONS 1. PROPER GROUNDI NG of the electrical power must be provided. Failure to follow this warning may result in electrical shock to operating and maintenance personnel. Always exercise extreme care when working with the instrument out of its case. Refer to Section 4, Paragraph 4-1 for additional instructions.
- Page 7 Section 1 General Information more advanced techniques in the manufacture of carbon, 1-1. INTENDED USE OF THE MODEL 3158 metal film, and wirewound resistors. By using the latest 1-1 a_ The Quan-Tech Model 315B is a solid state instru noise measuring techniques in conjunction with very ment designed to make resistor NOISE INDEX measure...
- Page 8 noise generated with DC voltage applied to the resistor '-2. PURPOSE AND USE OF THIS MANUAL under test. (TOTAL NOISE) 1 -2a. This instruction manual will provide the user with 1 - 3 b. Front panel meters display the voltage level of the the necessary information for the proper operation of internal power supply and the RMS value of the resistor the Model 315B Resistor Noise Test Set.
- Page 9 1 -5 c_ The power requirements are approximately 3 0 capability of operating a remote test position up to volt -amperes. The unit i s fused a t the rear with 3 /8 10 ft. from the Model 315B proper. This cable comes ampere, Bussman Type MD L fuse.
- Page 10 > a::: FIGURE 1-2. TYPICAL NOISE BANDPASS F ILTER...
- Page 11 Section 2 Operation Never set the 'Function' switch to Total Noise (T)' with the test terminals short circuited as doing so will burn out the test power supply! 2-1. SCOPE 2-4. START-UP PROCEDURE 2·1 a. The material covered in this section will provide 2·4a.
- Page 12 TABLE 2·1. FUNCTIONAL DESCRIPTION OF CONTROLS AND INDICATORS ON THE FRONT PANEL (FIGURE 2·1) POWER toggle switch (S101) Applies AC line power to the instrument. Power ON condition is indicated by a red lamp above the switch. VOLTS meter (M102) In conjunction with the METER MULTIPLIER dB (D) switch this meter reads the DC voltage applied to the resistor under test when the FUNC...
- Page 13 FIGURE 2-1. FRONT PANEL 3158 RESISTOR-HOISE TEST SET VOLTS o OS-' VOU D.C . .. (0) RESISTOR RANGE ME.Tt.R MUlTIPLIER VOLTAaE AD.JUST METER ,",UlTIPlIU .. OH ... 5 fUNCTION CAl.IBRATE ADJUST -...
- Page 14 TABLE 2-2 FUNCTIONAL DESCRIPTION OF THE CONTROLS AND JACKS ON THE REAR PANEL (FIGURE 2-2) EX T CA L phone jack (Jl0 7 ) Provides the means for checking calibration with a n external source, either noise or sine wave or for measuring the internal calibrate signal. Input resistance at this jack is 6 00 ohms and the attenuation ratio to the cal ibrate point is 6 000 to 1 .
- Page 15 from the total noise reading in dB (T). For resistors 2-5. RESISTOR NOISE MEASUREMENTS having a small difference between total noise and system 2 - 5 a_ Set the front panel controls as follows: noise a correction factor, f(T -S), must be applied. The correction factor may be obtained from the graph in _ _ _ __ _ .
- Page 16 TABLE 2-3. RECOMMENDED TEST VOLTAGES 1/2 WATT AND HIGHER 1/10,1/8 AND 1/4 WATT WATT AND HIGHER 1/10,1/8 AND 1 /4 WATT OHMS OHMS VOLTS V OLTS OHMS OHMS VOLTS VOLTS 0.20 :3 .1n 0.20 -14.0 -14.0 10.1 14.0 5.00 0.24 0.24 -12.4 -12.4...
- Page 17 TABLE 2-3. RECOMMENDED TEST VOLTAGES (Continued) 1/2 WATT AND HIGHER 1/10,118 AND 1/4 WATT 1/2 WATT AN D HIGHER 1/10,118 ANn 1/4 WATT (0) * (0)* (0) * (0) * VOLTS VOLTS OHMS OHMS OHMS OHMS VOLTS VOLTS 50.0 30.1 32.0 46.0 40.0...
- Page 18 � 12 ...J II <t � � � � <t � ::::> � � DIFFERENCE BETWEEN TOTAL NOISE, AND SYSTEM NOISE FIGURE 2-3. CORRECTION CHART FOR PRESENCE OF SYSTEM NOISE...
- Page 19 Section 3 Principles of Operation age across the resistor under test. The description of 3-1. INTRODUCTION these circuits will be given in the remaining portion of 3 - 1 a. This section consists of two parts, the first being a this section.
- Page 20 panel switch. In addition to the selection indicated, addi 3-3 f. RMS DETECTOR AND LOG CONVERTER (FIG tional decoupling and filtering for the variable power sup URE 5-7) plies is packaged on these boards. RMS detection and conversion to log output are accom 3-3d.