Elenco 3 1-2 Digit with Temperature User Manual

OPERATOR’S

INSTRUCTION MANUAL

M-2625

AUTO RANGING

DIGITAL MULTIMETER

with Temperature Probe

Copyright © 2007 Elenco®Electronics, Inc.

Contents

1. Safety Information 3,4

2. Safety Symbols 5

3. Front Plate of the Meter 5
Input Terminal 6
Function Rotary Switch 7
Function Press Button 8,9
LCD Display 10

4. Power On Option 11

5. Auto Power Off 11

6. Measurement Range 11

7. Making Measurements 12
Preparation 12
Measuring Voltage 12

Measuring DC Voltage 13
Measuring AC Voltage 14,15

Measuring Current 16

Measuring DC Current 17-19

Measuring AC Current 19-21
Measuring Resistance 21,22
Testing Diodes 23
Testing for Continuity 24
Measuring for Capacitance 25,26
Measuring Frequency 27
Measuring Duty Cycle 28,29
Measuring Temperature 29,30

8. Maintenance 31
Battery Replacement 31
Fuse Replacement 32

9. General Specifications 33-35

-2-

Introduction

This series LCD auto ranging and auto power-off digital multimeter
is a portable, compact, 3¾ digit multimeter. It is ideally suited for
field, lab, shop, car, and home.

CAUTION: Read, understand and follow all Safety Rules and
Operating Instructions in this manual before using this product.

1. Safety Information

Use the meter only as specified in this manual. Otherwise, the
protection provided by the meter may be impaired. Refer to safety
information in Table 1.

Table 1. Safety Information

Warning

!

To avoid possible electric shock or personal injury, follow these
guidelines:

• Do not use the meter if it is damaged. Before you use the meter,

inspect the case. Look for cracks or missing plastic. Pay particular
attention to the insulation surrounding the connectors.

• Inspect the test leads for damaged insulation or exposed metal.

Check the test leads for continuity. Replace damaged test leads
before you use the meter.

• The RESPONSIBLE BODY shall be made aware that, if the

equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.

• Do not use the meter if it operates abnormally. Protection may be

impaired. When in doubt, have the meter serviced.

• Do not operate the meter around explosive gas, vapor, or dust.

• Do not apply more than the rated voltage, as marked on the meter,

between terminals or between any terminal and earth ground.

• Before use, verify the meter’s operation by measuring a known

voltage.

• When measuring current, turn off circuit power before connecting

the meter in the circuit. Remember to place the meter in series with
the circuit.

-3-

Table 1. Safety Information (continued)

Warning

• When servicing the meter, use only specified replacement parts.

• Use caution when working above 30VAC rms, 42V peak, or 60VDC.

Such voltages pose a shock hazard.

• Avoid working alone.

• When using the probes, keep your fingers behind the finger guards

on the probes.

• Connect the common test lead before you connect the live test lead.

When you disconnect test leads, disconnect the live test lead first.

• Remove test leads from the meter with the battery door or portions

of the cover removed or loosened.

• To avoid false readings which could lead to possible electric shock

or personal injury, replace the batteries as soon as the low battery
indicator ( ) appears.

• Use only type “AA” batteries or equivalent, properly installed in the

meter case, to power the meter.

• To avoid the potential for fire or electrical shock, do not connect the

thermocouples to electrically live circuits.

+

!

Caution

To avoid possible electric shock or personal injury, follow these
guidelines:

• Disconnect circuit power and discharge all high-voltage capacitors

before testing resistance, continuity, diodes, or capacitance.

• Use the proper terminals, function, and range for your

measurements.

• Before measuring current, check the meter’s fuses and turn power

OFF to the circuit before connecting the meter to the circuit.

-4-

2. Safety Symbols

Symbols used on the meter and in this manual are explained in
Table 2.

Table 2. International Electrical and Relative Symbols

AC (Alternating Current) Important Information

~

DC and AC

~

DC (Direct Current) Earth Ground

Equipment Safety Standard

Double Insulated

3. Front Plate of Meter

LCD Display

Function Press
Button

Function
Rotary Switch

!

Caution, risk of electric shock

Low Battery Indicator

+

Input Terminal

Figure 1. Front plate of the meter

-5-

Input Terminal

About terminal function refer to Table 3 and Figure 2.

Figure 2. Input Terminal

Table 3. Input Terminal

Terminal Function Description

/ /)/OF

V /ΩΩ/ Hz

mA

COM

10A

Volts, ohm, diode, frequency, DUTY, temperature and
capacitance measurement, and testing for continuity terminal

Milliampere current, microampere current measurement terminal

Common terminal for all measurements

Ampere current measurement terminal

Function Rotary Switch

About function rotary switch refer to Table 4 and Figure 3.

-6-

Table 4. Function Rotary Switch Symbols

Position of Switch

V

~

ΩΩ

)

Hz

Figure 3. Function Rotary Switch

Function

DC/AC voltage measurement

Resistance measurement, diode test, testing for continuity

Capacitance measurement

Frequency measurement / Duty cycle measurement

-7-

Table 4. Function Rotary Switch Symbols (continued)

Position of Switch

O

F

µµ

A

~

mA

~

A

~

OFF

Temperature measurement

DC/AC microampere current measurement

DC/AC milliampere current measurement

DC/AC ampere current measurement

Power off position

Function

Function Press Button

About press function button refer to Figure 4.

Figure 4. Function Press Button

1. SELECT (state choice)

There are several functions at one rotary switch position; press the

SELECT button to select the desired function: ~V,
A~ range for AC or DC voltage, AC or DC current, resistance,

diode, or audible continuity measurement.

2. RANGE (range selection)

With the power on and the meter on the auto range mode, press the
RANGE button to select the desired measurement range manually.

The range goes from minimum to maximum by pressing the
RANGE button multiple times, and returns to minimum after
reaching the maximum range. Pressing and holding the RANGE
button for over two seconds returns the meter to auto range. This
button does not affect the frequency, capacitance, diode or
continuity range.

ΩΩ

, µµA~, mA~,

-8-

3. REL∆∆(relative measurement)
Press the REL
a “REL∆” symbol appears on the LCD. The result of the relative
measurement is the difference between the measuring value and
the reference value. The reference value is produced the same as
the momentary value by press the REL
button again to exit this function and the “REL∆” symbol disappears
from the display. This button does not affect the frequency, duty
cycle, diode and continuity test functions.

4. HOLD (data hold)
Pressing the HOLD button enables the data hold function and an
“ H ” symbol appears on the display. The momentary value appears
on the display. Press the HOLD button again to exit this function
and the “ H ” symbol disappears from the display. This button does
not affect the frequency measurement function.

∆∆

button to use the relative measuring function and

∆∆

button. Press the REL

∆∆

5. Hz/DUTY
When making a frequency, DC or AC voltage measurement, press
this button to switch between the Hz or duty cycle test mode.

6. RESET (reset button)
Press this button to clear all values and to restart the meter.

(frequency and duty cycle measurement switch button)

LCD Display

About function rotary switch refer to Table 5 and Figure 5.

-9-

Figure 5. LCD Display

Table 5. LCD Display Symbols

Sequ. No. Symbol Description

1 8.8.8.8

2 –

3 AC

4

+

5 RS232

6 Auto

7 REL

8

H

9

10

11 hFE

ΩΩ

12

/ kΩΩ/ M

Hz / kHz / MHz

∆∆

The display digit group

Negative symbol

AC (alternating current) indicator

Battery power is weakening

Serial transmission (not used on this meter)

Auto range indicator

Relative measurement

Data hold

Diode symbol

Audible continuity function indicator

Transistor gain indicator (not used)

Resistance units

ΩΩ

Frequency units

-10-

Table 5. LCD Display Symbols (continued)

Sequ. No. Symbol Description

13

O

C OF

14 %

mV / V

15

nF / µµF

mA / A

16

Temperature units

O

C not used on this meter)

(

Percent symbol

Voltage units
Capacitance units
Current units

Overload

4. Power On Option

To release the Auto Power Off function, press and hold the

SELECT button when the meter is on.

5. Auto Power Off

When the meter has been on for 30 minutes without any action from
the user, the meter will automatically switch to the standby mode.
To bring back the display, turn the rotary switch to a different
position, push any button, or restart the meter.

6. Measurement Range

A measurement range determines the maximum measurement
value. Most of the functions of the meter have more than one range.

1. It is important to select the correct range

• If the range is too small, “OL” shows on the display for
overload.

• If the range is too large, the value of the reading will be very
small with less resolution.

2. Auto range and manual range options

• In the auto range mode, the meter automatically selects the
best range for the input detected.

• In the auto range mode, press the RANGE button to enter the
manual range and select the desired range.

-11-