Elenco Digital Multimeter User Manual

ELENCO

®

150 Carpenter Ave • Wheeling, IL 60090

[phone] • Website: www.elenco.com

e-mail: [e-mail]

OPERATOR’S

INSTRUCTION MANUAL

M-2625A

AUTO RANGING

DIGITAL MULTIMETER

with Temperature Probe

Copyright © 2012 ELENCO

®

WARRANTY POLICY

Your digital multimeter has been tested and
conforms to our rigid requirements on
performance and durability. It is guaranteed to be
free of defects in workmanship, materials and
construction for a period of 2 years. If this
product should fail during normal use within the
first 3 months from the date of purchase,
ELENCO

®

will repair or replace the unit at no
cost. For the remainder of the warranty period, a
nominal service charge is required to cover
shipping and handling.

When returning merchandise for repair, please
include proof of purchase, a brief letter of explanation
of problem and sufficient packing material. Before
returning any merchandise, please call our service
department at [phone] to obtain a return
authorization number (RA).

ELENCO®• Service Department

150 Carpenter Avenue • Wheeling, IL 60090

Contents

1. Introduction 3

2. Safety Information 3

3. Safety Symbols 5

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

5. Power On Option 11

6. Auto Power Off 11

7. Measurement Range 11

8. Making Measurements 12
Preparation 12
Measuring Voltage 12

Measuring DC Voltage 13
Measuring AC Voltage 14

Measuring Current 16

Measuring DC Current 17
Measuring AC Current 19

Measuring Resistance 21
Testing Diodes 23
Testing for Continuity 24
Measuring Capacitance 25
Measuring Frequency 27
Measuring Duty Cycle 28
Measuring Temperature 29

9. Maintenance 31

General Maintenance 31
Replacing the Batteries 31
Replacing the Fuses 32

10.General Specifications 33

11.Detailed Accuracy Specifications 33

-2-

Table 12. Capacitance Detailed Accuracy Specifications

Table 13. Diode Detailed Accuracy Specifications

Overload protection: 250V DC/AC rms

Table 14. Frequency & Duty Cycle Detailed Accuracy Specifications

Table 15. Temperature Detailed Accuracy Specifications

Overload protection: 250V DC/AC rms

-35-

Range Resolution Accuracy Note

40nF 10pF ±(3.5% rdg + 10)

Overload protection:

250V DC/AC rms

400nF 100pF

±(3.0% rdg + 5)

4μF 1nF

40μF 10nF

400μF 100nF

±(20% rdg + 5)

4000μF 1μF

Range Description Note

Display reads approximate
forward voltage of diode

Test current: 1mA ±0.6mA
Test voltage: approx. 2.8V

Range Resolution Accuracy Sensitivity Note

9.999Hz

-

10MHz

0.001Hz

-

10kHz

±(0.1% rdg + 5)

<100kHz:

1.5V rms

>100kHz:

5V rms

Overload

protection:

250V rms

Duty cycle:
10Hz-1kHz

0.1% - 99.9% 0.1% ±(2.5% rdg + 5) 1.5V rms

Range Accuracy Note

32°F - 104°F
(0°C – 40°C)

±5°F; ±3°C (using built-in

temperature sensor)

±5°F (room temperature)

–50°C – 200°C

±(1.5% rdg + 3)

–58°F – 392°F

±(1.5% rdg + 5)

200°C – 700°C

±(2.0% rdg + 3)

392°F – 1292°F

±(2.0% rdg + 5)

Table 8. AC Voltage Detailed Accuracy Specifications

Table 9. DC Current Detailed Accuracy Specifications

Table 10. AC Current Detailed Accuracy Specifications

Table 11. Resistance Detailed Accuracy Specifications

-34-

1. 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.

2. 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-

!

Range Resolution Accuracy Note

400mV 0.1mV ±(1.5% rdg + 8) Frequency response:

50Hz - 400Hz
Input resistance: 10MΩ
Overload protection:

600VDC or 600VAC rms

4V 1mV

±(1.0% rdg + 5)

40V 10mV
400V 100mV
600V 1V ±(1.5% rdg + 5)

Range Resolution Accuracy Note

400μA 0.1μA

±(2.0% rdg + 5)

Overload protection:
Fast fuse 0.5A/250V and
fast fuse 10A/250V.

10A for 15sec. maximum

Input voltage drop: <

0.4V

4000μA 1μA

40mA 10μA

±(1.5% rdg + 5)

400mA 100μA

4A 1mA

±(2.0% rdg + 5)

10A 10mA

Range Resolution Accuracy Note

400μA 0.1μA

±(2.5% rdg + 3)

Overload protection:
Fast fuse 0.5A/250V and
fast fuse 10A/250V.

10A for 15sec. maximum
Input voltage drop: <

0.4V

Frequency response:
50Hz - 400Hz

4000μA 1μA

40mA 10μA

±(2.0% rdg + 5)

400mA 100μA

4A 1mA

±(2.5% rdg + 5)

10A 10mA

Range Resolution Accuracy Note

400Ω 100mΩ

±(1.0% rdg + 5)

Overload protection:

250V DC/AC rms

4kΩ 1Ω

40kΩ 10Ω

400kΩ 100Ω

4MΩ 1kΩ

±(2.0% rdg + 5)

40MΩ 10kΩ

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.

• The finger or any part of your body shall not extend beyond the
barrier of the test probe when measuring.

• 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 two “AA” batteries (NEDA 1604, IEC 6F22, 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 damage to the meter or to the equipment under test,
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-

10. General Specifications

Display: 3¾ digit LCD with a maximum reading of 4000.
Range Control: Auto range or manual range control.
Polarity: Automatic negative polarity indication.
Zero Adjustment: Automatic
Overrange Indication: Only the “OL” display.
Low Battery: The symbol “ ” is displayed when the battery

voltage is below approximately 2.4V.
Auto Power Off: 10 minutes after stopping the switch or no key-

input, the meter automatically enters the power off mode.
Safety Standards: ETL / h EMC/LVD. The meter is up to the

standards of IEC1010 Pollution Degree 2; overvoltage category III
Operating Environment: Temperature 32° to 104°F (0° to 40°C),

humidity <80% RH.
Storage Environment: Temperature –4° to 140°F (–20° to 60°C),

humidity <90% RH.

Power: Two 1.5V “AA” batteries.
Dimensions: 6 1/2” [165mm] (H) x 3 17/64” [83mm] (W) x

1 29/64” [37mm] (D)

Weight: Approximately 9.2oz. / 260g. (including batteries)

11. Detailed Accuracy Specifications

Accuracies are ± (% of reading + number in last digit) at 73°F
±41°F/23°C ±5°C, <75% RH.

The detailed accuracy specifications are shown in Tables 7 to 18.

Table 7. DC Voltage Detailed Accuracy Specifications

-33-

!

+ –

Range Resolution Accuracy Note

400mV 0.1mV

±(0.5% rdg + 5)

Input resistance: 10MΩ

Overload protection:
600VDC or 600VAC rms.

4V 1mV

40V 10mV
400V 100mV
600V 1V ±(0.8% rdg + 5)

+ –

Replacing the Fuses

Warning

To avoid electrical shock or damage to the meter, only use
replacement fuses ∅5x20 0.5A/250V FAST or ∅6x25 10A/250V FAST.

1. Turn the Function Rotary Switch to the OFF position and remove
the test leads from the terminals. Remove the battery cover as
shown in Figure 18. Referring to Figure 19, examine or replace
the meter’s fuses as follows:

2. Using a screwdriver, unscrew the three screws on the back case.
Remove it by lifting it up from the bottom and carefully separating
the top part from the two mounting tabs.

3. Remove either fuse by gently prying one end loose, then sliding
the fuse out of its bracket.

4. Install ONLY the specified replacement fuses with the amperage,
voltage, and speed ratings:

∅5x20 0.5A/250V FAST or ∅6x25 10A/250V FAST.

5. Reinstall the back case. Secure the back case by turning the
screws clockwise.

Figure 19. Fuse Replacement

-32-

3. Safety Symbols

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

Table 2. International Electrical and Relative Symbols

4. Front Plate of Meter

Figure 1. Front plate of the meter

-5-

~

AC (Alternating Current) Important Information

DC (Direct Current)

Caution, risk of electric shock

h

European Safety Standard Earth Ground

Double Insulated Low Battery Indicator

The symbol indicating separate
collection for electrical and
electronic equipment.

U.S. Safety Standard

!

LCD Display

Function Press
Button

Function
Rotary Switch

Input Terminal

!

Screws

Elenco®Fuse Part #

0.5A/250V ∅5x20
fast blow 533004
10A/250V ∅6x25
fast blow 531101

+ –

Screw

Input Terminal

About terminal function refer to Table 3 and Figure 2.

Figure 2. Input Terminal

Table 3. Input Terminal

-6-

9. Maintenance

General Maintenance

Periodically wipe the case with a damp cloth and mild detergent.
Do not use abrasives or solvents. Dirt or moisture in the terminals
can affect readings. Clean the terminals as follows:

1. Turn the meter off and remove all test leads.

2. Shake out any dirt that may be in the terminals.

3. Soak a new swab with alcohol. Work the swab around each
terminal.

Replacing the Batteries

Replace the batteries with two “AA” batteries (R6P) or equivalent.

Warning

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.

Replace the batteries as follows (refer to Figure 18):

1. Turn the Function Rotary Switch to the OFF position and remove
the test leads from the terminals.

2. Remove the battery cover by using a screwdriver to turn the
battery door screw counterclockwise.

3.

Replace the batteries. Turn the screw clockwise to secure the cover.

Figure 18. Battery Replacement

-31-

Terminal Function Description

V/Ω /Hz

/ / )/°F/°C

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

μA/mA

Microampere current, milliampere current measurement terminal

COM

Common terminal for all measurements

10A

Ampere current measurement terminal

!

Screw

Battery: Two R6P
(AA) or equivalent

+ –

Figure 17. Temperature Measurement

-30-

Function Rotary Switch

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

Figure 3. Function Rotary Switch

Table 4. Function Rotary Switch Symbols

-7-

Position of Switch

Function

~

V

DC/AC voltage measurement

Ω

Resistance measurement, diode test, testing for continuity

)

Capacitance measurement

Hz

Frequency measurement / Duty cycle measurement

Table 4. Function Rotary Switch Symbols (continued)

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,

Ω

, Hz,

TEMP

,
μA~, mA~, 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.

-8-

Figure 16. Duty Cycle Measurement

Measuring Temperature

Warning

To avoid the potential of fire or electrical shock, do not
connect the thermocouples to electrically live circuits.

To measure temperature, proceed as follows:

1. Turn on the meter, then set up the meter as shown in Figure 17.

2. Set the Function Rotary Switch to the

TEMP

position (then, the “°F”

and “ ” symbols are indicated on the display).

3. Plug the positive leg (+) of the type K thermocouples into the
terminal and the negative leg (–) into the COM terminal

and read the value on the display. The range of the TP-03
thermocouples is –58

O

F~+1292OF.

4. Unplugging the thermocouples will display the ambient

temperature at the meter terminals.

-29-

Position of Switch

Function

°F/°C

Temperature measurement

μA

~

DC/AC microampere current measurement

mA

~

DC/AC milliampere current measurement

A

~

DC/AC ampere current measurement

OFF

Power off position

!

°F/°C

°F/°C

Measuring Duty Cycle

Duty cycle (or duty factor) is the percentage of time a signal is above
or below a trigger level during one cycle (Figure 16).

To measure duty cycle, proceed as follows:

1. Turn on the meter, then set up the meter as shown in Figure 15.

2. Insert the black test lead into the COM terminal and the red test
lead into the terminal.

3. Set the Function Rotary Switch to the Hz position. Then press
Hz/DUTY once to select DUTY Cycle measurement (then, a “%”
symbol is indicated on the display).

4. Connect the test leads to the circuit under test. The measured
value is shown on the display.

Figure 15. Duty Cycle Measurement

-28-

3. RELΔ (relative measurement)
Press the RELΔ button to use the relative measuring function and
a “Δ” 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 RELΔ button. Press the RELΔ
button again to exit this function and the “Δ” symbol disappears from
the display. This button does not affect the frequency, duty cycle,
diode and continuity test functions.

4. HOLD/ (data hold / backlight)
Press this button for less than 2 seconds and the meter will enter
the data hold mode and the “

HOLD ” symbol will appear on the

LCD. The value shown on the display will stay at its current reading
while this function is active. Pressing the button again will exit the
HOLD mode and the “ HOLD ” symbol will disappear. As a data hold
function, this button does not button does not have any effect on
the diode and continuity test functions.

The secondary function of this button is to enable the LCD backlight
feature. If you press the button for more than two seconds, the
backlight will illuminate. If you press the button again for more than
two seconds, the backlight will turn off. The backlight will turn off
automatically after eight seconds have elapsed.

5. Hz/DUTY

(frequency and duty cycle measurement switch button)
When you make a Frequency and Duty Cycle measurement, AC
voltage, or AC current 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.

-9-

HOLD

HOLD

Signal

LCD Display

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

Figure 5. LCD Display

Table 5. LCD Display Symbols

-10-

Measuring Frequency

Frequency is the number of cycles a signal completes each second.
The meter measures the frequency of a voltage or current signal
by counting the number of times the signal crosses a threshold level
each second.

To measure frequency, proceed as follows:

1. Turn on the meter, then set up the meter as shown in Figure 14.

2. Insert the black test lead into the COM terminal and the red test

lead into the terminal.

3. Set the Function Rotary Switch to the Hz position (then, the “Hz”

is shown on the display).

4. Connect the test leads to the circuit under test. The meter auto

ranges to one of the frequency ranges, then the measured value
is shown on the display.

Figure 14. Frequency Measurement

-27-

Sequ. No. Symbol Description

1 8.8.8.8

The display digit group

2

Auto power off indicator

3 Auto

Auto range indicator

4 –

Negative symbol

5 AC

AC (Alternating Current) indicator

6 DC

DC (Direct Current) indicator

7

Battery power is weakening

8

Relative measurement

9

Data hold

10

Diode symbol

11

Audible continuity function indicator

12 %

Percent symbol

13 °C °F

Temperature measurement

+ –

1

2

3

5

6

4

7 8 9 10 11

13

14

15

12

16

FREQ.

Figure 13. Capacitance Measurement

-26-

Table 5. LCD Display Symbols (continued)

5. Power On Option

To turn off the Auto Power Off function, press and hold any button
(except RESET) while turning the selector knob to any range
position. The Auto Power Off indicator will disappear.

6. Auto Power Off

When the meter has been on for 10 minutes without any action from
the user, the meter will automatically turn off. To restore power to
the meter, turn the rotary switch to a different position, push any
button, or restart the meter.

7. 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-

Sequ. No. Symbol Description

14

Ω / KΩ / MΩ

Hz / KHz / MHz

Resistance units
Frequency units

15

mV / V

nF / μF

μA / mA / A

Voltage units
Capacitance units
Current units

16

Overload

+

–

CAP

• To return to the auto range setting, press and hold the
RANGE button for 2 seconds. The Auto icon will appear on
the display. You may also rotate the selector dial to another
position and back again to return to auto range.

3. Enter or exit manual range mode

• Press the RANGE button to select the manual range mode
and the Auto icon disappears. Each press of the RANGE
button increases the range. When the maximum range is
reached, the meter reverts to the lowest range.

• Press and hold the RANGE button for more than two seconds
to return to the autorange mode and the Auto icon will appear
on the display.

8. Making Measurements

Preparation

Checking the Battery Voltage

Rotate the Function Rotary Switch to any position away from the OFF
position. The battery voltage is adequate when the indication is clear
and the “ ” symbol is not on the display.

If the “ ” symbol appears on the display, or nothing shows on the
display at all, follow the battery replacement procedure shown in
related items in this manual and replace with new batteries specified.

Measuring Voltage

Voltage is the difference in electrical potential between two points.
The polarity of AC (alternating current) voltage varies over time, while
the polarity of DC (direct current) voltage is constant.

Danger

To avoid the danger of electric shock, never make
measurements on a circuit over 600V AC/DC (electrical
potential to ground 300V DC/AC). Do not operate the
Function Rotary Switch during measurement. Do not make
a measurement when opening the battery cover and the
meter case.

-12-

Keep the following in mind while doing a continuity test:

• Even with the test leads shorted, the indicated value may not be
“0”. This is because of the resistance of the test leads and not a
fault. If necessary, you can press the RELΔ button to
automatically subtract its value, then “0” will be indicated.

Measuring Capacitance

Caution

To avoid possible damage to the meter or to the equipment under
test, disconnect the circuit power and discharge all high-voltage
capacitors before measuring capacitance. Use the DC voltage
function to confirm that the capacitor is indeed discharged.

Capacitance is the ability of a component to store an electrical
charge. The unit of capacitance is the farad (F). Most capacitors are
in the nanofarad (nF) to microfarad (μF) range.
The meter measures capacitance by charging the capacitor with a
known current for a known period of time according to the
measuring capacitance:

Measuring capacitance <4μF Measuring time is about 2 seconds
Measuring capacitance <40μF Measuring time is about 7 seconds
Measuring capacitance <100μF Measuring time is about 30 seconds

To measure capacitance, proceed as follows:

1. Turn on the meter, then set up the meter as shown in Figure 13.

2. Insert the black test lead into the COM terminal and the red test
lead into the terminal.

3. Set the Function Rotary Switch to the ) position (then, “AUTO”
and “nF” symbols are indicated on the display).

4. Connect the test leads to both ends of the capacitor under test,
then the measured value is shown on the display. If the capacitor
is polarized, connect the red test lead to the positive lead and the
black test lead to the negative lead.

The following are some tips for measuring capacitance:

• To improve the measurement accuracy of small value
capacitors, press the RELΔ button with the test leads open
to subtract the residual capacitance of the meter and leads.

-25-

!

+ –

+ –

Note: Open-circuit voltage between measuring terminals is

approximately 1.5V (measuring current approximately 1.5mA).

Testing for Continuity

Caution

To avoid possible damage to the meter or to the equipment
under test, disconnect the circuit power and discharge all
high-voltage capacitors before testing for continuity.

Continuity is the presence of a complete path for current flow. The
continuity test features a beeper that sounds if a circuit is complete
(the resistance less than 120Ω approx.). The beeper allows you to
perform quick continuity tests without having to watch the display.

The continuity function detects intermittent opens and shorts lasting
as little as 1 millisecond (0.001 second). These brief contacts cause
the meter to emit a short beep. Refer to Figure 12 for continuity
testing setup instructions.

Figure 12. Continuity Test

-24-

Measuring DC Voltage

1. Turn on the meter, then set up the meter to measure DC volts as
shown in Figure 6.

2. Insert the black test lead into the COM terminal and the red test
lead into the terminal.

3. Set the Function Rotary Switch to the ~V position (then, “AUTO”
and “mV” symbols are indicated on the display).

4. Connect the black test lead to the negative side of the circuit
under test and the red test lead to the positive side of the
circuit.The measured value is indicated on the display. If you
connect the test leads to the opposite polarity, the “–” symbol
appears on the display.

Figure 6. DC Voltage Measurement

-13-

V

OFF

ON

Measuring AC Voltage

1. Turn on the meter, then set up the meter to measure AC volts as
shown in Figure 7.

2. Insert the black test lead into the COM terminal and the red test
lead into the terminal.

3. Set the Function Rotary Switch to the ~V position and press
SELECT to select the AC voltage measuring mode (then,
“AUTO”, “AC” and “V” symbols are indicated on the display).

4. Connect the test leads to the circuit under test, then the
measured value is indicated on the display.

5. When measuring voltage less than 400mV, press the RANGE
button to switch to manual range mode and select the AC 400mV
range. Doing so will provide a better resolution for your
measurement.

6. You can press the Hz/DUTY button to read the signal frequency
or duty cycle under measurement from the display.

-14-

Testing Diodes

Caution

To avoid possible damage to the meter or to the equipment
under test, disconnect the circuit power and discharge all
high-voltage capacitors before testing diodes.

Use the diode test to check diodes, transistors, silicon controlled
rectifiers (SCRs), and other semiconductor devices. The test sends
a current through a semiconductor junction, then measures the
junction’s voltage drop. A typical junction drops 0.5V to 0.8V.

To test a diode out of a circuit, set up the meter as shown in
Figure 11. In a circuit, a similar diode should still indicate a
forward-bias reading of 0.5V to 0.8V; however, the reverse-bias
reading can vary depending on the resistance of other pathways
between the probe tips.

Figure 11. Diode Test

-23-

Forward Bias

+

–

Reverse Bias

–

+

1. To measure resistance, turn on the meter, then set up the meter
as shown in Figure 10.

2. Insert the black test lead into the COM terminal and the red test
lead into the terminal.

3.

Set the Function Rotary Switch to the

Ω

position (then, “AUTO”,

“ ”, “OL”, and “MΩ” symbols are indicated on the display).

4. Connect the test leads to both ends of the resistance under test,
then the measured value is shown on the display.

Keep the following in mind when measuring resistance:

• Because the meter’s test current flows through all possible paths
between the probe tips, the measured value of a resistor in a
circuit is often different from the resistor’s rated value.

• The test leads can add 0.1Ω to 0.2Ω of error to resistance
measurements. To test the leads, touch the probe tips together
and read the resistance of the leads. If necessary, you can press
the RELΔ button to automatically subtract its value.

Figure 10. Resistance Measurement

-22-

Figure 7. AC Voltage Measurement

Note: When taking a measurement of less than 20mV at the 400mV

AC range, the measurement value cannot be indicated correctly.
Even if shorted, the input line at the 4V AC range, 1 ~ 3 digits may
remain indicated. In that case, by pressing the RELΔ button, “0” will
be indicated.

-15-

V

Ω

Measuring Current

Warning

Never attempt an in-circuit current measurement where the
open-circuit potential to earth is greater than 300V. You may
damage the meter or be injured if the fuse blows during such
a measurement.

Caution

To avoid possible damage to the meter or to the equipment
under test, check the meter’s fuses before measuring
current. Use the proper terminals, function, and range for
your measurement. Never place the probes across (in
parallel with) any circuit or component when the leads are
plugged into the current terminals. Maximum measurement
time allowed at the 10A current range function is 15
seconds. If you carry on making a measurement
continuously over 15 seconds, it can cause an erroneous
measurement and damage the meter.

Danger

Do not operate the Function Rotary Switch during
measurement. Do not make a measurement when opening
the battery cover or the meter case.

Current is the flow of electrons through a conductor. To measure
current, you must open the circuit under test, then place the meter
in series with the circuit.

To measure AC or DC current, proceed as follows:

-16-

Figure 9. AC Current Measurement (continued)

Measuring Resistance

Caution

To avoid possible damage to the meter or to the equipment
under test, disconnect the circuit power and discharge all
high-voltage capacitors before measuring resistance.

Resistance is an opposition to current flow. The unit of resistance is
the ohm (Ω). The meter measures resistance by sending a small
current through the circuit.

-21-

!

!

A

Note: To avoid blowing the meter’s 500mA fuse, use the mA

terminal only if you are sure the current is less than 400mA.

Figure 9. AC Current Measurement

-20-

Measuring DC Current

1. Turn off power to the circuit. Discharge all high-voltage

capacitors.

2. Turn on the meter, then set up the meter to measure DC current
as shown in Figure 8.

3. Insert the black test lead into the COM terminal and the red lead
into an input appropriate for the measurement range as shown
in Table 6.

4. Connect the black test lead to the negative side of the circuit
under test and the red test lead to the positive side of the circuit
so the meter is in series with the circuit.

5. Turn the on the power for the circuit under test.

6. The measured value is indicated on the display.

If you connect the test leads to the reverse polarities, a “–” symbol
will be shown on the display.

Note: To avoid blowing the meter’s 500mA fuse, use the mA
terminal only if you are sure the current is less than 400mA.

Table 6. Current Measurement

-17-

Rotary Switch Input Ranges

μA

~

μA / mA

400μA / 4000μA

mA

~

μA / mA

40mA / 400mA

A

~

10A

4A / 10A

μA

mA

Figure 8. DC Current Measurement

-18-

Figure 8. DC Current Measurement (continued)

Measuring AC Current

1. Turn off power to the circuit. Discharge all high-voltage
capacitors.

2. Turn on the meter, then set up the meter to measure AC current
as shown in Figure 9.

3. Insert the black test lead into the COM terminal and the red lead
in an input appropriate for the measurement range as shown in
Table 6.

4. Connect the test leads to the circuit under test so the meter is in
series with the circuit.

5. Set the meter to AC mode by pressing the SELECT button
(then, “AUTO” “AC” and “μA”, “mA”, or “A” symbols are indicated
on the display).

6. Turn on the power to the circuit under test.

7. The measured value is shown on the display.

-19-

μA

mA

A