Leader Electronics Corp. LMV-181A User Manual

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I
LEADER
ELECTRONICS
CORP.
f
2-6-33
TSUNASHIMA-HIGASHI,
KOHOKU-KU.
YOKOHAMA.
JAPAN
PHONE:
(045)541-2123
FAX:(045)544-1280
TELEX:
J47780
JPLEADER
LEADER
INSTRUMENTS
CORP.
380 OSER
AVENUE.
HAUPPAUGE.
N.
Y.
11788
U.S. A.
PHONE:(516)231-6900
TELEX
:
510-227-9669
LEADER
HAUP
FAX: 516-231-5295
90091
K®[5]
Printed
in Japan.
LEADER
ELECTRONICS
CORP.

Leader Electronics Corp. LMV-181A Specifications

General

Brand	Leader Electronics Corp.
Model	LMV-181A
Category	Measuring Instruments
Language	English

Summary

General Information and Features

General Instrument Description

Describes the millivoltmeters/voltmeters' capabilities, sensitivity, precision, and use as amplifiers.

Key Features

Lists features like wide bandwidth, high accuracy, stable design, decibel scales, and pre-amplifier use.

Technical Specifications

Voltmeter Specifications

Details voltage ranges, accuracy, frequency characteristics, input impedance, and max input voltage.

Amplifier Specifications

Details output voltage, frequency characteristics, output impedance, distortion factor, and operating temperature.

System and Panel Overview

System Block Diagram

Illustrates the internal functional blocks of the AC Millivoltmeter.

Front and Rear Panel Controls

Explains the various controls and indicators on the instrument's panels.

Front Panel Elements

Meter Display and Input/Output

Details the meter scales and the INPUT/OUTPUT terminals.

Operational Controls

Covers the POWER switch, pilot lamp, and RANGE button.

Adjustment and Protection Features

Explains zero adjustment, FUSE, power cord, and cord winder.

Preliminary Operational Notes

Line Voltage Requirements

Specifies the allowable tolerance for the line voltage used by the instrument.

Indicator Zero Adjustment

Provides instructions for zeroing the indicator when the power is off.

Operational Guidelines

Input Voltage and Noise Considerations

Discusses excessive input voltage, waveform distortion, and induction noise.

Measurement Preparation

Steps for preparing the instrument before connecting to power and performing measurements.

AC Voltage Measurement Procedure

Details the steps for measuring AC voltage, including range selection and reading.

Advanced Operation and Specifications

LMV-181B Specific Ranges

Details the voltage ranges, scales, and multipliers for the LMV-181B model.

Decibel Range Usage

Explains decibel calibrations and how to read decibel values.

Output Terminal Functionality

Explains using the OUTPUT terminal for monitoring or as a pre-amplifier.

Alternating Current Calculation

Provides the formula relating AC voltage, current, and resistance.

Internal Circuitry Description

Circuitry Components

Describes the attenuators, protective circuit, impedance conversion, and amplifiers.

Meter Amplifier and Circuit

Explains how the meter amplifier and rectifier circuits drive the meter indication.

Monitor and Stabilization Circuits

Details the monitor amplifier's output and the stabilization power circuit.

Maintenance Procedures

Cover Removal

Instructions for removing the instrument's cover.

Power Transformer Voltage Adjustment

Guidance on changing wiring for different power source voltages.

Calibration and Adjustment

Stabilization Power Adjustment

Procedure to adjust VR4 to achieve +18V on the stabilization power line.

Correcting Indicated Values

Steps for calibrating voltage readings using VR2, VR1, and VC1.

Output Voltage Terminal Adjustment

Procedure to adjust VR3 for correct output voltage at the terminals.

Schematic Diagram and Components

Circuit Diagram

The detailed electronic schematic diagram of the LMV-181A.

Component Markings

Explanation of markings for capacitors, resistors, and other components.