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Hameg HM303-6 Service Manual

Hameg HM303-6
66 pages
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Release: December, 2007
35 MHz
Analog Oscilloscope
HM303-6
Servicemanual
English

Table of Contents

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Hameg HM303-6 Specifications

General IconGeneral
TypeOscilloscope
Bandwidth30 MHz
Channels2
Sample Rate100 MS/s
Trigger ModesAuto, Normal, Single
Trigger SourceCH1, CH2, Line, Ext
DisplayCRT
Input Impedance1 MΩ
Power Supply100-240 V AC, 50/60 Hz

Summary

General Information Regarding CE Marking

Data Cable Guidelines

Recommendations for using screened data cables to maintain EMC compliance.

Signal Cable Requirements

Guidelines for signal cables, emphasizing length and screening for EMC.

RF Immunity Considerations

Explains how RF fields can affect the oscilloscope's performance.

HM303-6 Oscilloscope Specifications

Front Panel Controls and Indicators

HM303-6 Block Diagram

HM303-6 Circuit Board Descriptions

YP Board Description

Description of the YP board's functions, including input, amplifier, and trigger stages.

YP Board: Trigger Section Overview

Description of the trigger signal processing stages on the YP board.

XY Board Description

Description of the XY board's functions, including CT, Y Final Amplifier, and X deflection.

TB Board Description

Description of the TB board's functions, including sync amp, LF filter, and sawtooth generator.

CR Board Description

Description of the CR board's functions, including focus and astigmatism controls.

CC Board Description

Description of the CC board's functions, including the calibrator signal.

CC Board: Component Tester Function

Explanation of the component tester's oscillator and signal generation.

FC Board Description

Function of the FC board, which controls instrument operation via switches and potentiometers.

PS Board Description

Description of the PS board, including power supply and high voltage generator.

PCB Interconnection Diagram

Circuit Board Replacement Procedures

PS Board Replacement

Procedure for removing and replacing the PS board.

FC Board Replacement

Procedure for removing and replacing the FC board.

CC Board Replacement

Procedure for removing and replacing the CC board.

YP Board Replacement

Procedure for removing and replacing the YP board.

XY Board Replacement

Procedure for removing and replacing the XY board.

TB Board Replacement

Procedure for removing and replacing the TB board.

CR Board Replacement

Procedure for removing and replacing the CR board.

HM303-6 Troubleshooting Guide

Troubleshooting Security Precautions

Essential safety advice before performing troubleshooting procedures.

Opening the Oscilloscope for Troubleshooting

Step-by-step guide on how to safely open the oscilloscope case.

Preliminary Troubleshooting Tests

Initial checks and voltage measurements to perform before deeper troubleshooting.

Error Diagnostics and Troubleshooting

Examples and steps to diagnose errors based on instrument behavior.

Performance Verification Procedures

Required Test Instruments for Performance Checks

List of test equipment needed for performance verification.

Basic Settings for Performance Checks

Standard oscilloscope settings to apply before starting performance checks.

CRT and Signal Path Checks

Verification of trace rotation, CRT intensity, focus, astigmatism, and signal path integrity.

Channel Accuracy and Response Checks

Verification of Y accuracy, square wave response, and balance for CH I/II.

Time Base and Magnification Checks

Procedures for checking time base accuracy and X-magnification.

Triggering and Video Signal Checks

Verification of trigger sensitivity, bandwidth, video, and external trigger functions.

Spare Parts List

Adjustment Procedures Overview

High Voltage and Service Warnings

Critical warnings regarding high voltage and qualified personnel for service.

Test Instruments Required for Adjustments

List of necessary test equipment for performing adjustments.

General Adjustment Notes

Important notes and basic settings before starting adjustment procedures.

Power Supply and Voltage Adjustments

Procedures for adjusting power supply voltages: +146V, +175V, +12V, -6V.

CRT and Signal Path Adjustments

Adjustments for CRT intensity, focus, astigmatism, and Y plate voltage.

Gain, Balance, and Attenuator Adjustments

Adjustments for Y-gain, balance, and attenuator compensation for CH I/II.

Time Base and Trigger Adjustments

Adjustments for sawtooth start, time base accuracy, and trigger symmetry.

Magnification and XY Mode Adjustments

Adjustments for X-magnification, linearity, XY gain, and bandwidth.

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