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Radio Shack 22-178 - User Manual

Radio Shack 22-178
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Cat. No. 22-178
OWNER’S MANUAL
Please read before using this equipment.
Auto-Ranging LCD
Digital Multimeter
22-178.fm Page 1 Friday, August 6, 1999 11:38 AM
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Radio Shack 22-178 Specifications

General IconGeneral
DC Voltage Ranges200mV, 2V, 20V, 200V, 1000V
DC Current Ranges200µA, 2mA, 20mA, 200mA, 10A
Resistance Ranges200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ, 20MΩ
Continuity TestYes
Display Digits3.5 digits
Diode TestYes
Battery Type9V
DisplayLCD
AC Voltage Ranges200V
AC Current Ranges200mA, 10A

Summary

Owners Manual

Safety Information and Warnings

General Safety Precautions

Safety advice, symbols, and precautions for safe multimeter operation.

Product Features

Core Technology and Automation

Latest IC, auto power off, auto-ranging, and bar-graph display.

Measurement and Range Features

High-speed sampling and expanded current ranges for advanced measurements.

Additional Product Features

Measurement and Operational Functions

Data hold, continuity buzzer, diode check, and auto-polarity functions.

Usability and Protection Features

Low-battery indicator, fold-out stand, and protective holster.

Safety Guidelines

General Safety Rules

Essential safety rules for operating the multimeter.

High-Voltage and Servicing Precautions

Cautions for high voltages and advice on meter repairs.

Critical Usage Warning

Warning about extreme caution for users unfamiliar with electrical circuits.

Specifications

Display, Bar Graph, and Voltage Specs

Details on display, bar graph, and DC/AC voltage ranges and accuracy.

Current and Resistance Specs

Specifies DC/AC current and resistance measurement ranges and accuracy.

Range Control, Polarity, and Indicators

Explains range control, polarity, input impedance, continuity, and battery indicators.

Operating Environment and Accessories

Overrange indication, temperature limits, power, dimensions, and included accessories.

Special Panel Markings

Terminal Markings and Limits

Explains current limit (20A) and voltage limit (1kV/750V) markings.

Preparation

Battery Installation and Test Leads

Guide to installing batteries and using test leads.

Accessory Usage

Instructions for using alligator clips, stand, and holster.

Using the Meter

Initial Setup and Basic Operation

Steps to confirm correct operation and familiarize with meter functions.

Measurement Techniques and Features

Taking accurate measurements, auto power off, range control, and data hold.

Bar Graph Display Usage

How to use the bar graph for observing measurement changes.

Making Measurements

Measuring Voltages

Step-by-step instructions for measuring DC/AC and AC with DC bias voltages.

Measuring Current and Resistance

Procedures for measuring DC/AC current and resistance.

Circuit and Semiconductor Checks

Checking continuity and testing diodes and semiconductors.

Maintenance

General Care and Fuse Replacement

Tips for meter care, cleaning, and replacing fuses.

RadioShack Limited Warranty

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