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Matco Tools MD251 User Manual

Matco Tools MD251
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USER'S MANUAL
MD251 Basic Multimeter
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Matco Tools MD251 Specifications

General IconGeneral
TypeDigital Multimeter
DisplayLCD
Diode TestYes
Continuity TestYes
Safety RatingCAT III 600V
Temperature Range-40°C to 1000°C

Summary

SAFETY

Terms in this manual

Defines WARNING and CAUTION terms used in the manual.

Meter Protection Rating

Details double insulation and measurement category ratings for the meter.

Measurement Categories

Explains IEC categories II, III, and IV for measurements.

Safety Warnings and Symbols

Specific Warnings and Cautions

Lists specific warnings and cautions for safe operation.

International Electrical Symbols

Identifies common electrical symbols used on the instrument.

CENELEC Directives Compliance

Mentions compliance with CENELEC directives.

PRODUCT DESCRIPTION

Product Overview and Controls

Identifies and describes the main components and controls of the multimeter.

Analog Bar-graph Function

Explains the purpose and use of the analog bar-graph display.

Measurement Principles

Average Sensing RMS Calibrated

Explains the RMS measurement technique using average sensing.

True RMS Measurement

Details True RMS measurement and potential causes of errors.

Crest Factor and NMRR/CMRR

Explains Crest Factor, NMRR, and CMRR for meter performance.

OPERATION

Pre-measurement Caution

Advises testing voltage function on a known source before hazardous measurements.

DCV, ACV, & Line Frequency Functions

DC Voltage (DCV) Measurement

Shows DC voltage measurement setup and display.

AC Voltage (ACV) Measurement

Shows AC voltage measurement setup and display.

Line Frequency (Hz) Measurement

Explains how to activate and use the Hz function.

Resistance, Continuity, Diode Test

Resistance Measurement

Details resistance measurement using the meter.

Continuity Test

Explains how to use the continuity test function.

Diode Test

Describes how to perform diode tests and interpret results.

Capacitor Discharge Caution

Warns about discharging capacitors before measurement.

DCmV and ACmV Functions

DC Millivolt (DCmV) Measurement

Shows DC millivolt measurement setup.

AC Millivolt (ACmV) Measurement

Shows AC millivolt measurement setup.

μA, mA, and A Current Functions

DC Current Measurement

Details DC current measurement modes.

AC Current Measurement

Details AC current measurement modes.

Electric Field EF-Detection

EF-Detection Modes

Explains Non-Contact and Probe-Contact EF-Detection.

Hold and Relative Zero Modes

Describes the Hold and Relative Zero (Δ) functions.

Manual vs. Auto-ranging

Explains how to switch between manual and auto-ranging.

Meter Features and Controls

Beeper and Input Warning

Describes how to set the beeper and input warning functions.

Auto-Power-Off (APO)

Explains the Auto-Power-Off feature and its disabling.

MAINTENANCE

General Maintenance Warning

Warns about safety precautions during maintenance.

Battery and Fuse Replacement

Battery and Fuse Specifications

Lists battery type and fuse ratings for replacement.

Replacement Procedure

Details the steps for replacing batteries and fuses.

GENERAL SPECIFICATION

Display and Operating Environment

Lists display details, temperature, humidity, and altitude specs.

Safety and EMC Standards

Details safety standards and EMC compliance.

Measurement Categories and Overload Protection

Specifies measurement categories and overload protection limits.

Power Supply and Dimensions

Lists power supply, consumption, dimensions, and weight.

Electrical Specification Details

AC Voltage Specifications

Provides accuracy and input impedance for AC voltage ranges.

Ohm Specifications

Details accuracy and open circuit voltage for resistance ranges.

DC Voltage Specifications

Provides accuracy and input impedance for DC voltage ranges.

Measurement Specification Details

Audible Continuity and Diode Tester Specs

Lists specs for continuity and diode testers.

DC and AC Current Specifications

Provides accuracy and burden voltage for current ranges.

EF-Detection and Hz Function Specs

Details specs for EF-Detection and Hz functions.

LIMITED WARRANTY

Warranty Terms and Conditions

Outlines the limited warranty terms and conditions for the product.

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