Extech Instruments DM4750D Manual de usuario

Digital Multimeter DM4750D

Introduction

Congratulations on your purchase of the Extech DM4750D Multimeter. This meter measures AC/DC

Voltage, AC/DC Current, Resistance, Diode Test, and Continuity plus Thermocouple Temperature.

This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable

service. Please visit our website (www.extech.com) to check for the latest version of this User Guide,

Product Updates, and Customer Support.

Safety

International Safety Symbols

WARNING

CAUTION

MAX

600V

This symbol, adjacent to another symbol or terminal, indicates the user must

refer to the manual for further information.

This symbol, adjacent to a terminal, indicates that, under normal use,

hazardous voltages may be present

Double insulation

This WARNING symbol indicates a potentially hazardous situation, which if not

avoided, could result in death or serious injury.

This CAUTION symbol indicates a potentially hazardous situation, which

if not avoided, may result damage to the product.

This symbol advises the user that the terminal(s) so marked must not be

connected to a circuit point at which the voltage with respect to earth

ground exceeds (in this case) 600 VAC or VDC.

OVERVOLTAGE CATEGORY III

This meter meets the IEC 61010-1-2001 standard for OVERVOLTAGE CATEGORY III. Cat III

meters are protected against overvoltage transients in fixed installation at the distribution level.

Examples include switches in the fixed installation and some equipment for industrial use with

permanent connection to the fixed installation.

SAFETY INSTRUCTIONS

This meter has been designed for safe use, but must be operated with caution. The rules listed

below must be carefully followed for safe operation.

1. NEVER apply voltage or current to the meter that exceeds the specified maximum:

Input Protection Limits

Function

Maximum Input

VAC

750V DC/AC

V DC or V AC

1000V DC/AC, 200Vrms on 200mV range

mA DC

200mA 250V fast acting fuse

A DC

20A 250V fast acting fuse(30 seconds max every 15 minutes)

Ohms, Continuity

250Vrms for 15sec max

2. USE EXTREME CAUTION when working with high voltages.

3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V

above earth ground.

4. NEVER connect the meter leads across a voltage source while the function switch is

in the current, resistance, or diode mode. Doing so can damage the meter.

5. ALWAYS discharge filter capacitors in power supplies and disconnect the power

when making resistance or diode tests.

6. ALWAYS turn off the power and disconnect the test leads before opening the covers

toreplace the fuse or battery.

7. NEVER operate the meter unless the back cover and the battery cover is in place

and fastened securely.

Controls and Jacks

1. Rubber holster (must be removed to access battery)

2. 2000 count LCD display

3. °F button for temperature measurements

4. °C button for temperature measurements

5. Function switch

6. mA, uA and A input jacks

7. COM input jack

8. Positive input jack

9. Battery check button

10. Hold button (freezes displayed reading)

11. LCD backlight button

Note: Tilt stand, test lead holders, and battery compartment are on rear of unit.

Symbols and Annunciators

•))) Continuity

Diode test

Battery status

Test lead connection error

HOLD Display hold

ºF Degrees Fahrenheit

ºC Degrees Celsius

DISPLAY BACKLIGHT

Press and hold the button to turn on the display backlight function. The backlight will automatically turn off

after 15 seconds.

BATTERY CHECK

The CHECK function tests the condition of the 9V battery. Set the function switch to the 200VDC range and

press the CHECK button. If the reading is less than 8.5, battery replacement is recommended.

HOLD

The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or to exit

the hold function.

AUTO POWER OFF

The auto off feature will turn the meter off after 15 minutes.

LOW BATTERY INDICATION

If the icon appears in the display, the battery voltage is low and the battery should be replaced.

WRONG CONNECTION INDICATION

The icon will appear in the upper right conner of the display and the buzzer will sound whenever the

positive test lead is inserted into the 20A or uA/mA input jack and a non-current (green) function is selected. If this

occurs, turn the meter off and reinsert the test lead into the proper input jack for the function selected.

Specifications

Function

Range

Resolution

Accuracy

DC Voltage

200mV

0.1mV

(0.3% reading + 2 digits)

(V DC)

0.001V

(0.5% reading + 2 digits)

200V

0.1V

1000V

(0.8% reading + 2 digits)

AC Voltage

50 to 400Hz

400Hz to 1kHz

(V AC)

0.001V

(1.0% reading +6 digits

(2.0% reading + 8 digits

200V

0.1V

(1.5% reading +6 digits

(2.5% reading +8 digits

750V

(2.0% reading +6 digits

(3.0% reading +8 digits

DC Current

200 A

0.1 A

(1.5% reading + 3 digits)

(A DC)

200mA

0.1mA

20A

0.01A

(2.5% reading + 3 digits)

AC Current

50 to 400Hz

400Hz to 1kHz

(A AC)

200mA

0.1mA

(1.8% reading +8 digits

(2.5% reading +10 digits)

20A

0.01A

(3.0% reading +8 digits)

(3.5% reading +10 digits)

Resistance

200

0.1

(0.8% reading +4 digits)

2000

(0.8% reading +2 digits)

20k

0.01k

(1.0% reading +2 digits)

200k

0.1k

20M

0.01M

(2.0% reading +5 digits)

Temperature

-20 to 750ºC

1ºC

(3.0% reading +3 digits)

-4 to 1382ºF

1ºF

(meter only, probe accuracy not included)

NOTE: Accuracy specifications consist of two elements:

(% reading) –This is the accuracy of the measurement circuit.

(+ digits) –This is the accuracy of the analog to digital converter.

NOTE: Accuracy is stated at 18oC to 28oC (65oF to 83oF) and less than 75% RH.

General Specifications

Diode Test

Test current of 1mA maximum, open circuit voltage 2.8V DC typical

Continuity Check

Audible signal when resistance is less than approximately 150

Input Impedance

10MΩ

AC Response

Average responding

ACV Bandwidth

50Hz to 1kHz

DCA voltage drop

200mV

Display

3 ½ digit, 2000 count LCD, 0.9” digits

Auto-Power Off

Meter switches OFF after 15 minutes (approximately) of inactivity

Overrange indication

“1” is displayed

Polarity

Automatic (no indication for positive polarity); Minus ( -) sign for negative

polarity.

Measurement Rate

2 times per second, nominal

Low Battery Indication

“

” is displayed if battery voltage drops below operating voltage

Battery

One 9 volt (NEDA 1604) battery

Fuses

mA, µA ranges; 0.2A/250V fast blow

A range; 20A/250V ceramic fast blow

Operating Temperature

5ºC to 40ºC (41ºF to 104ºF)

Storage Temperature

-20ºC to 60ºC (-4ºF to 140ºF)

Operating Humidity

Max 80% up to 31ºC (87ºF) decreasing linearly to 50% at 40ºC (104ºF)

Storage Humidity

<80%

Operating Altitude

2000 meters (7000ft.) maximum

Weight

342g (0.753lb) (includes holster)

Size

187 x 81 x 50mm (7.36” x 3.2” x 2.0”) (includes holster)

Safety

For indoor use and in accordance with the requirements for double

insulation to IEC1010-1 (2001): EN61010-1 (2001) Overvoltage

Category III 600V and Category II 1000V, Pollution Degree 2.

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