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GR 1311-A Operating Instructions Manual

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OPERATING INSTRUCTIONS
ТУРЕ 1311-A
AUDIO
OSCILLATOR
GENERAL
RADIO
COMPANY
В

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Summary of Contents for GR 1311-A

  • Page 1 OPERATING INSTRUCTIONS ТУРЕ 1311-A AUDIO OSCILLATOR GENERAL RADIO COMPANY В...
  • Page 2 OPERATING INSTRUCTIONS ТУРЕ 1311-A AUDIO OSCILLATOR Form 131 1-0100-B June, 1963 Copyright 1 963 by General Radio Company West Concord, Massachusetts, USA GENERAL RADIO COMPANY WEST CONCORD, MASSACHUSETTS, USA...

  • Page 3: Table Of Contents

    Figure 1-1. Type 1311- А Audio Oscillator. TABLE CONTENTS Section 4: PRINCIPLES OF OPERATION ... 9 Section 1 : INTRODUCTION ....... 1 1.1 Purpose ........1 4.1 General ..........9 4.2 Circuit Description ......9 1.2 Description ........1 Section 2: INSTALLATION .......
  • Page 4 Figure A. Output of Type 1311- A as a function of frequency, loaded and unloaded (typical). 0Л Figure В. Distortion characteristics of Type 1311- A as functions of frequency and load (typical). Figure C. Typical output amplitude stability of the oscillator, showing warmup drift (A) and short-term var ­...
  • Page 5 SPECIFICATIONS FREQUENCY Range: 11 fixed frequencies from 50 to 10,000 cps. Control: 50, 60, 100, 120, 200, 400, 500, 1000, 2000, 5000, 10,000 cps selected by rotary switch. A vernier provides a ±2% adjustment about nominal. Accuracy: ±1%, vernier at 0. OUTPUT Power: 1 w into matched load.

  • Page 6: Section 1 : Introduction

    SECTION INTRODUCTION 1.1 PURPOSE. The Type 1311-A Audio Oscillator (Figure 1-1) is a complete, com ­ pact, and self-contained audio-frequency source intended for general labo ­ ratory use, and is particularly well suited for use in audio-frequency bridge measurements. It can provide an essentially pure sinusoidal output, stable in amplitude and frequency, over a wide range of load impedances, at 11 frequencies.
  • Page 7 Ref Desig Name Type Function (Fi e . 1-1) J101 OUTPUT Jack-top Output termin ­ thru binding posts als and J103 (GR Type ground. 938) PL501 None 3-prong plug Power input (GR Type terminal. 109-A) Telephone External None J 104...

  • Page 8: Section 2: Installation

    2.2.3 TYPE 1620-A PRECISION CAPACITANCE MEASURING ASSEMBLY. The Type 1311-A is an integral part of the Type 1620-A Precision Capaci ­ tance Measuring Assembly (see Figure 2-1). As such, it is mounted in combination with the Type 1232-A Tuned Amplifier and Null Detector, as described in paragraph 2.2.2.
  • Page 9 TYPE 1311-A AUDIO OSCILLATOR a standard grounding-type power receptacle providing 105-125 volts at 50 to 400 cps. Figure 2-1. Mounting options.

  • Page 10: Output Frequency Change

    0 to 50 C. It is not affected by humidity. 2.5.2 EXTERNAL FIELDS. Since the Type 1311-A is often mounted with the sensitive Type 1232- A Null Detector, stray magnetic and electrostatic fields should be kept to a minimum by suitable shielding, and orientation of signal leads.

  • Page 11: Section 3: Operating Procedure

    PROCEDURE 3.1 PREPARATION FOR USE. 3.1.1 POWER CONNECTIONS. Connect the Type 1311-A to a suitable source of power as indicated on the plate above the power receptacle on the rear panel. A three-wire power cord (Type CAP-22) is supplied. 3.1.2 GROUNDING. The instrument should normally be operated with the chassis grounded through the three-wire power cord.
  • Page 12 OPERATING PROCEDURE engraving, with the ΔF control set at 0. For greater precision monitor the output with a frequency meter, such as the General Radio Type 1130-A Digital Frequency Meter. 3.2.3 POWER SELECTION. Set the MAXIMUM OUTPUT switch (2, Fig ­ ure 1 - 1 )to a value in volts or milliamperes (as engraved on the front panel) that is slightly greater than the amplitude of the voltage or current de ­...
  • Page 13 ­ ternal standard frequency to control the output frequency of the Type 1311-A. This is particularly useful to drive the Type 1615- A Capaci ­ tance Bridge when making precise measurements of frequency-sensitive parameters such as dissipation factor.

  • Page 14: Section 4: Principles Of Operation

    SECTION PRINCIPLES OPERATION 4.1 GENERAL. The Type 1311-A Audio Oscillator uses a Wien-type network and a closed-loop, transistor-amplifier circuit to obtain a stable yet inexpensive signal source which will satisfy many oscillator requirements in the audio ­ frequency spectrum. See Figure 4-1 for a simplified diagram and Figure Figure 4-1.
  • Page 15 TYPE 1311-A AUDIO OSCILLATOR The frequency-determining network has a transfer function: e OUT 1 + 3RCs + R 2 C 2 s 2 e IN s = j 2 π f where R =R F1 =R F2 C = C101 = C103 At some oscillator frequency, f o , this function equals +1/3.
  • Page 16 PRINCIPLES OF OPERATION 4.2.3 OUTPUT TRANSFORMER. The winding resistance of the output transformer, T101, isolates the oscillator from the load and ensures that the output waveform will not be clipped under any load condition. output winding is tapped to provide five switch-selectable, output-voltage ranges to match a wide variety of load requirements.

  • Page 17: Warranty

    5.3 MINIMUM PERFORMANCE STANDARDS. The Type 1311-A in normal operation should perform within the standards described in Table 5-1. Table 5-2 lists the test equipment re ­ quired to check minimu m performance.
  • Page 18 TABLE 5-1 MINIMUM PERFORMANCE STANDARDS FOR TYPE 1311-A FRE ­ TEST MAXIMUM OUTPUT ΔF LOAD NORMAL INDICATION IF INDICATION QUENCY OUTPUT CONTROL POSI ­ ABNORMAL SWITCH SWITCH POSITION TION POSITION POSITION Frequency 10 V None Using frequency counter or meter, check...

  • Page 19: Removal Of Cover

    TYPE 1311 -A AUDIO OSCILLATOR TABLE 5-2 TEST EQUIPMENT REQUIRED Recommended GR Type Numbers* Description Frequency Counter or Meter 1130-A, 1150-A, 1142-A 1800-A, 1806-A Vacuum Tube Voltmeter Distortion and Noise Meter or 1932-A, or 1900-A Wave Analyzer Output-Power Meter 1840-A...

  • Page 20: Removal And Replacement

    SERVICE AND MAINTENANCE ETCHED BOARD Figure 5-1. Wiring diagram for FREQUENCY switch S101. 5.7 REMOVAL AND REPLACEMENT. 5.7.1 GENERAL. Faulty parts should be removed and replaced by units meeting the description given in the Parts List at the end of this section. 5.7.2 SEMICONDUCTORS.

  • Page 21: Internal Adjustments

    5.9 AC POWER CONVERSION. 5.9.1 GENERAL. The Type 1311-A is available from the factory wired either for use with inputs of 105 to 125 or 210 to 250, 50 to 400 cps. How ­ ever, if the user wishes to convert the instrument from one power option to the other, it is necessary merely to change wiring to the power-trans ­...
  • Page 22 SERVICE AND MAINTENANCE WARNING Pull the power cord from the receptacle before performing the following procedures. 5.9.2 TRANSFORMER WIRING. Remove the dust cover and place the in ­ strument upside down on the bench. The input transformer (T501) is mounted on the side wall. For 115-volt operation, transformer leads 1 and 3 should connect to lug 5 on S501 and leads 2 and 4 to lug 6 on S501.
  • Page 23 PARTS LIST (continued) DESCRIPTION PART NO. REF NO. POTENTIOMETER, Carbon, 250 ±20% R129 6040-0200 R130 RESISTOR, Composition, 10k ±5% l/2w 6100-3105 RESISTOR, Composition, 6.8k ±5% l/2w R131 6100-2685 RESISTOR, Composition, 10 ±5% l/2w R132 6100-0105 RESISTOR, Composition, 680 ±5% l/2w R 1 33 6100-1685 RESISTOR, Composition, 47 ±5% l/2w...
  • Page 26 Figure 5-2. Schematic Diagram...
  • Page 27 Figure 5-2. Schematic Diagram...
  • Page 28 Q50I PL50I 0106 0104 ATII3 Top rear interior view. Pigure 5-4' Bottom rear interior view.
  • Page 29 Figure 5-5. Etched circuit hoard.
  • Page 30 RADIO COMPANY WEST CONCORD, MASSACHUSETTS* EMerson 9-4400 Mission S-74 00 SALES ENGINEERING OFFICES YORK* ANGELES* 1000 North Seward Street Broad Avenue at Linden Ridgefield, New Jersey Los Angeles 38, California Telephone Hollywood 9-6201 Telephone N.Y. WOrth 4 2722 N.J. WHitney 3-3140 FRANCISCO SYRACUSE 1186 Los Altos Avenue...

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