Krohn-Hite 6900B Operating And Maintenance Manual
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Krohn-Hite 6900B Operating And Maintenance Manual

5hz to 1mhz wide range fully automatic distortion analyzer designed for ultra-low distortion and ac voltage measurements.
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5Hz to 1MHz
WIDE RANGE FULLY AUTOMATIC
DISTORTION ANALYZER
MODEL 6900B SERIAL NO. __________
OPERATING AND MAINTENANCE
MANUAL
Unit 4, 15 Jonathan Drive, Brockton, MA 02301-5566
Tel: (508) 580-1660; Fax: (508) 583-8989
E-mail: info@krohn-hite.com; Web: www.krohn-hite.com

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Summary of Contents for Krohn-Hite 6900B

  • Page 1 5Hz to 1MHz WIDE RANGE FULLY AUTOMATIC DISTORTION ANALYZER MODEL 6900B SERIAL NO. __________ OPERATING AND MAINTENANCE MANUAL Unit 4, 15 Jonathan Drive, Brockton, MA 02301-5566 Tel: (508) 580-1660; Fax: (508) 583-8989 E-mail: info@krohn-hite.com; Web: www.krohn-hite.com...

  • Page 2: Table Of Contents

    Model 6900B Table of Contents TABLE OF CONTENTS GENERAL DESCRIPTION ....................... 1-1 Introduction ......................... 1-1 Specifications ......................1-1 General Specification ....................1-3 OPERATION ........................... 2-1 Introductions........................ 2-1 Power Requirements....................2-1 Turn-on Procedure....................... 2-1 Controls, Terminals, Indicators..................2-1 Operation ........................2-2 Optional Features ......................
  • Page 3 Model 6900B Figure 1.1 Model 6900B...

  • Page 4: General Description

    GENERAL DESCRIPTION INTRODUCTION The Krohn-Hite Model 6900B, illustrated in Figure 1.1, is a Fully Automatic Distortion Analyzer designed or ultra-low distortion and ac voltage measurements in the 5Hz to 1MHz frequency range. The Distortion Analyzer will measure total harmonic distortion (THD) down to 0.005%, typically, with 0.001% resolution.
  • Page 5 Section 1 – General Description Model 6900B 1.2.2.3 Input volts: 0.25 – 130 1.2.2.4 Distortion levels: >0.005% 10Hz to 50kHz: ±15% of reading or 0.005%, whichever is greater. 5Hz to 100kHz: ±15% of reading or 0.01%, whichever is greater. 100kHz to 500kHz: ±15% of reading or 0.05%, whichever is greater.

  • Page 6: General Specification

    Model 6900B Section 1 – General Description 1.2.13 OSCILLATOR OUTPUT 1.2.13.1 Frequency: 1kHz, fixed. 1.2.13.2 Output (rms): 5 volts at 3 milliamperes maximum. 1.2.13.3 Distortion: 0.003%. 1.2.13.4 Impedance: 600 ohms. GENERAL SPECIFICATIONS 1.3.1 FRONT PANEL CONTROLS MODE switch for selecting either voltmeter (VOLTS) or distortion (% DIST) operation.
  • Page 7 Section 1 – General Description Model 6900B Figure 1.2 Operating Controls, Connectors and Display...

  • Page 8: Operation

    The Model 6900B is designed to operate from a single phase, 50-400Hz ac power source of 90-110, 108- 132, 180-220, or 216-264 volts. Line switches allow the 6900B to be powered from one of the above 4 voltage ranges. The ac power receptacle is a standard 3-pin connector, and complies with the European I.E.C.

  • Page 9: Operation

    Output impedance; 600 ohms. Maximum output current; 3mA rms. May be used as a standard to test linearity of components system distortion characteristics or performance of the 6900B. 2.4.1.7 DISTORTION OUTPUT: AC voltage for visual inspection of the input signal with the fundamental removed.
  • Page 10 The DDM will then display the total harmonic distortion directly in percent. 2.5.3 AC VOLTAGE MEASURMENTS As an ac voltmeter, the 6900B will measure the rms voltage of an input wave form between 10 millivolts and 130 volts rms over the Analyzers frequency range of 5Hz to 1MHz. 2.5.3.1 To measure ac voltage: a.

  • Page 11: Optional Features

    Section 2 – Operation Model 6900B 2.5.5 ANALOG OUTPUT The ANALOG OUTPUT may be used with a recorder or plotter. It provides a dc voltage of approximately 100mV/1% of the displayed distortion. 2.5.6 1kHz OUTPUT The 1kHz OUTPUT is a fixed, 1kHz low distortion, 0.003%, sinewave for use as a stimulus to measure the distortion characteristics of another circuit or system or to self-check the Analyzer.
  • Page 12 Model 6900B Section 2 – Operation Function Description Mode “low for “% DIST” “high” for “VOLTS” 1000 0800 0400 0200 0100 0080 0040 0020 OUTPUT 0010 0008 0004 0002 0001 X.XXX Decimal Point XX.XX Decimal Point 1XXX 3-state “high” for “high Z”...
  • Page 13 Section 2 – Operation Model 6900B This page intentionally left blank.

  • Page 14: Incoming Acceptance

    3.2.2 LOW DISTORTION CHECK Connect an Ultra-Low Distortion Oscillator (Krohn-Hite Model 4400A or equivalent for measurements from 10Hz to 100kHz and Model 4200B or equivalent for measurements from 500kHz to 1MHz) to the Analyzer’s INPUT. Set the MODE switch to “VOLT” and adjust the oscillator output voltage to 7Vrms.
  • Page 15 Section 3 – Incoming Acceptance Model 6900B 3.2.3 ANALOG OUTPUT The ANALOG OUTPUT is a dc voltage proportional to the percent distortion reading and is approximately 100mV/1%. 3.2.4 DISTORTION OUTPUT The DISTORTION OUTPUT is a visual indication of the percent distortion displayed on the Analyzer’s Digital Display Meter (DDM), and is approximately 100mV rms/% THD.

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