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Radio Shack 22-174A - User Manual

Radio Shack 22-174A
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Cat. No.22-174A
OWNER'S MANUAL
Please
read
before using
this equipment.
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Radio Shack 22-174A Specifications

General IconGeneral
DisplayLCD
DC Voltage Ranges200mV, 2V, 20V, 200V, 1000V
AC Voltage Ranges200V, 750V
DC Current Ranges200µA, 2mA, 20mA, 200mA, 10A
Continuity TestYes
Display Digits3.5
DC Voltage Range200mV to 1000V
AC Voltage Range200V to 750V
DC Current Range200µA to 10A
Diode TestYes
Battery Type9V
Low Battery IndicatorYes
Resistance Ranges200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ
Accuracy DC Voltage±0.5%
Accuracy AC Voltage±1.2%
Accuracy DC Current+/- 1% of full scale
Display TypeDigital

Summary

Key Features of the Digital Multimeter

Measurement Capabilities

Highlights auto-ranging, True RMS, frequency, and temperature functions.

Advanced Functions and Safety

Includes bar graph, data hold, continuity, overload protection, and auto-polarity.

Safety Precautions for Meter Operation

General Safety Guidelines

Essential rules for safe usage, including voltage limits and lead handling.

Understanding True RMS Measurements

Definition and Benefits of True RMS

Explains RMS for AC values and its accuracy with non-sine waves.

Technical Specifications Overview

Voltage and dBm Specifications

Details DC/AC voltage and dBm ranges, accuracy, and impedance.

Current and Resistance Specifications

Lists DC/AC current, resistance ranges, resolution, and accuracy.

Capacitance, Frequency, and Diode Test Specs

Covers capacitance, frequency measurement, and diode test parameters.

General Operational Specifications

Includes temperature, environment, dimensions, and power requirements.

Special Panel Markings and Icons

Understanding Terminal Markings

Explains current/voltage limits and safety symbols on the meter.

Preparing for Operation

Installing Batteries

Step-by-step guide for inserting the 6 AA batteries.

Making Measurements

Meter Operation Basics

Covers turning on, phantom readings, and overrange indications.

Measuring DC Voltage

DC Voltage Measurement Procedure

Steps for setting function, connecting leads, and reading DC voltage.

Measuring AC Voltage

AC Voltage Measurement and dBm Conversion

Procedure for AC voltage and switching to dBm display.

Measuring AC Voltage on a DC Bias

DC Blocking Capacitor Functionality

Explains how the meter handles AC superimposed on DC.

Measuring 3-Phase AC Voltages

Safety and Calculation for 3-Phase

Advises caution and provides method for line-to-line voltage calculation.

Measuring AC;DC Current

Current Measurement Safety and Setup

Critical warnings and procedure for connecting meter in series.

AC;DC Current Measurement Procedure

Measurement Steps and Notes

Details circuit breaking, probe connection, range shifting, and fuse protection.

Measuring Resistance

Resistance Measurement Safety and Procedure

Emphasizes power removal and outlines steps for resistance testing.

Resistance Measurement Tips

Handling High Resistance and Lead Effects

Tips for compensating lead resistance and measuring over 400kΩ.

Checking Continuity

Continuity Test Procedure and Notes

How to use the audible continuity function and interpret results.

Checking Diodes

Diode Test Procedure and Interpretation

Steps to test diodes, determine forward voltage, and identify good/bad components.

Checking Transistors

Transistor Pinout, Type, and Gain Measurement

Procedure to test transistor characteristics using the hFE socket.

Transistor Testing Considerations

Limitations for Power and High-Frequency Transistors

Advises against testing power transistors and discusses hFE stability.

Measuring Frequency

Frequency Measurement Safety and Setup

Warning for high AC voltage and procedure for frequency measurement.

Frequency Measurement Notes

Gate Signal and Range Selection for Frequency

Details on measurement methods and manual range adjustment.

Measuring Capacitance

Capacitance Measurement Procedure and Safety

Instruction to discharge capacitors and steps for measurement.

Using the Hold Function

Freezing Measurement Readings

How to use the Data Hold feature to capture readings.

Using the Bar Graph Display

Bar Graph Functionality and Interpretation

Explains the bar graph's role in indicating trends and levels.

Manually Selecting the Range

Switching to Manual Range Mode

Procedure for disabling auto-ranging and selecting ranges manually.

Using the Beep Function

Activating and Deactivating Beep Alerts

Instructions for controlling the button beep function.

Using the Temperature Function

Temperature Measurement Setup and Reading

Connecting the probe and reading temperatures in F or C.

Maintenance and Fuse Replacement

Fuse Protection and Replacement Guide

Details fuse ratings and provides steps for safe fuse replacement.

Caring for the Meter

General Meter Care and Battery Advice

Tips for protecting the meter, environmental considerations, and battery management.

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