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Radio Shack 22-168A - User Manual

Radio Shack 22-168A
46 pages
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MANUAL
DUAL-DISPLAY
OWNER’S
MANUAL
DIGITAL
MULTIMETER
w/PC
Interface
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22-
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Radio Shack 22-168A Specifications

General IconGeneral
DC Current Ranges200µA, 2mA, 20mA, 200mA, 10A
Display TypeLCD
Display Digits3.5
Continuity TestYes
Diode TestYes
Battery TestYes
Power Supply9V battery
TypeDigital
DC Voltage Ranges200mV, 2V, 20V, 200V
AC Voltage Ranges200V
Resistance Ranges200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ

Summary

Introduction to the Digital Multimeter

Key Measurement Functions

Introduces core features like PC interface, memory, and specific measurement functions.

Advanced Display and Hold Capabilities

Highlights features like Analog Bargraph, MAX/MIN Hold, Data Hold, and Relative Offset.

Circuit Testing and Protection Features

Covers Continuity, Diode, Logic Test, Auto-Polarity, Overload Protection, and UL Listing.

A Word About Safety

General Safety Precautions

Essential rules for safe operation, including voltage limits and probe connection.

High-Voltage Handling

Guidelines for safely measuring voltages above 30V AC or 60V DC.

Specifications Overview

Voltage and Current Measurement Specs

Detailed specifications for DC/AC voltage and DC current measurements.

Resistance and Frequency Specifications

Specifications for Resistance, Capacitance, and Frequency measurements.

Special Panel Markings Explained

Current and Voltage Terminal Markings

Explains markings for 20A MAX and 200mA MAX fused terminals.

Safety Symbols and Handling Warnings

Covers markings for high voltage, COM terminal safety, and probe handling.

Preparation for Use

Installing and Replacing the Battery

Step-by-step guide for battery installation and replacement.

Using the Test Probes Correctly

Instructions and cautions for using the provided test probes.

Using the Meter Stand

How to prop up or hang the meter using its integrated stand.

Pre-Operation Check Procedure

Power-On and Probe Connection Steps

Steps to turn on the meter and connect test probes correctly.

Function Selector and OHM Test

Guidance on rotating the selector and testing the OHM function.

Making Measurements

Understanding Phantom Readings

Explains phantom readings in voltage ranges when probes are disconnected.

Measuring High-Voltage Circuits Safely

Precautions for measuring high-voltage circuits safely.

AC;DC Voltage Measurement Guide

Procedure for measuring AC and DC voltages, including warnings.

Measuring AC;DC Current

Instructions and warnings for measuring current in series.

Measuring Capacitance

Steps to measure capacitance, including discharging the capacitor.

Measuring Resistance

Procedure for measuring resistance with safety warnings.

Checking Diodes

How to check diodes and determine forward voltage.

Checking Continuity

Steps to check circuit continuity with a buzzer sound.

Checking Transistors

Procedure to determine a transistor's base gain (hFE).

Measuring Frequency

Instructions for measuring signal frequency with voltage limits.

Logic Test

How to check digital circuits for logic states (HI, LO, ---).

Using Advanced Functions

Auto-Hold and Data Hold Features

Explains how to use automatic and manual data holding functions.

Minimum and Maximum Measurement Tracking

Features to track the minimum or maximum value of a changing reading.

Relative Measurement and Communication

Covers setting reference values and meter-to-computer communication.

Storing and Recalling Measurements

How to store up to ten measurements and recall them later.

Compare Function

Compares measurements to high and low reference values, showing PASS, HIGH, or LOW.

Dual Measurement Feature

Measures and displays two different types of measurements simultaneously.

Using the Meter with a Computer

Interfacing the Meter with a Computer

Steps to connect the meter to a computer using an RS-232C cable.

Using the Supplied Software

Overview of RS-DOS and Windows software for data logging and display.

Technical Information for Software Development

Communication parameters and data format for writing custom interface software.

Hints for Writing Custom Software

Provides programming tips and a BASIC example for data transmission.

Replacing the Fuse

Fuse Replacement Procedure

Steps to safely replace blown fuses with correct types.

Care and Maintenance

General Care Guidelines

Recommendations for keeping the meter dry, clean, and away from extreme temperatures.

Battery and Component Precautions

Advice on battery removal, avoiding modification, and seeking service.

FCC Statement

FCC Compliance Information

Statement regarding compliance with FCC rules for digital devices.

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