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.
OPERATOR’S
INSTRUCTION MANUAL
M-2625A
AUTO RANGING
DIGITAL MULTIMETER
with Temperature Probe
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 (847) 541-3800 to obtain a return
authorization number (RA).
ELENCO® • Service Department
150 Carpenter Avenue • Wheeling, IL 60090
ELENCO®
150 Carpenter Ave • Wheeling, IL 60090
(847) 541-3800 • Website: www.elenco.com
e-mail: elenco@elenco.com
Copyright © 2012 ELENCO®
Table 12. Capacitance Detailed Accuracy Specifications
Contents
1.
2.
3.
4.
Introduction
Safety Information
Safety Symbols
Front Plate of the Meter
Input Terminal
Function Rotary Switch
Function Press Button
LCD Display
5. Power On Option
6. Auto Power Off
7. Measurement Range
8. Making Measurements
Preparation
Measuring Voltage
Measuring DC Voltage
Measuring AC Voltage
Measuring Current
Measuring DC Current
Measuring AC Current
Measuring Resistance
Testing Diodes
Testing for Continuity
Measuring Capacitance
Measuring Frequency
Measuring Duty Cycle
Measuring Temperature
9. Maintenance
General Maintenance
Replacing the Batteries
Replacing the Fuses
10. General Specifications
11. Detailed Accuracy Specifications
-2-
3
3
5
5
6
7
8
10
11
11
11
12
12
12
13
14
16
17
19
21
23
24
25
27
28
29
31
31
31
32
33
33
Range
Resolution
Accuracy
40nF
400nF
4μF
40μF
400μF
4000μF
10pF
100pF
1nF
10nF
100nF
1μF
±(3.5% rdg + 10)
Note
±(3.0% rdg + 5)
Overload protection:
250V DC/AC rms
±(20% rdg + 5)
Table 13. Diode Detailed Accuracy Specifications
Range
Description
Note
Display reads approximate
forward voltage of diode
Test current: 1mA ±0.6mA
Test voltage: approx. 2.8V
Overload protection: 250V DC/AC rms
Table 14. Frequency & Duty Cycle Detailed Accuracy Specifications
Range
Resolution
Accuracy
Sensitivity
Note
Overload
protection:
250V rms
9.999Hz
10MHz
0.001Hz
10kHz
±(0.1% rdg + 5)
<100kHz:
1.5V rms
>100kHz:
5V rms
0.1% - 99.9%
0.1%
±(2.5% rdg + 5)
1.5V rms
Duty cycle:
10Hz-1kHz
Table 15. Temperature Detailed Accuracy Specifications
Range
Accuracy
32°F - 104°F
(0°C – 40°C)
±5°F; ±3°C (using built-in
temperature sensor)
–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)
Overload protection: 250V DC/AC rms
-35-
Note
±5°F (room temperature)
Table 8. AC Voltage Detailed Accuracy Specifications
Range
Resolution
Accuracy
Note
400mV
4V
40V
400V
600V
0.1mV
1mV
10mV
100mV
1V
±(1.5% rdg + 8)
Frequency response:
50Hz - 400Hz
±(1.0% rdg + 5)
Input resistance: 10MΩ
±(1.5% rdg + 5)
Overload protection:
600VDC or 600VAC rms
Table 9. DC Current Detailed Accuracy Specifications
Range
Resolution
400μA
0.1μA
4000μA
1μA
40mA
10μA
400mA
100μA
4A
1mA
10A
10mA
Accuracy
±(2.0% rdg + 5)
Note
Overload protection:
Fast fuse 0.5A/250V and
fast fuse 10A/250V.
Resolution
400μA
0.1μA
4000μA
1μA
40mA
10μA
400mA
100μA
4A
1mA
10A
10mA
10A for 15sec. maximum
±(2.0% rdg + 5)
Input voltage drop: <0.4V
Accuracy
±(2.5% rdg + 3)
±(2.0% rdg + 5)
±(2.5% rdg + 5)
Note
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
Table 11. Resistance Detailed Accuracy Specifications
Range
Resolution
400Ω
100mΩ
4kΩ
1Ω
40kΩ
10Ω
400kΩ
100Ω
4MΩ
1kΩ
40MΩ
10kΩ
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
±(1.5% rdg + 5)
Table 10. AC Current Detailed Accuracy Specifications
Range
1. Introduction
Accuracy
±(1.0% rdg + 5)
±(2.0% rdg + 5)
-34-
Note
!
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.
Overload protection:
250V DC/AC rms
• 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.
• 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 keyinput, 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
Range
Resolution
Accuracy
Note
400mV
0.1mV
4V
1mV
40V
10mV
400V
100mV
600V
1V
Input resistance: 10MΩ
±(0.5% rdg + 5)
Overload protection:
600VDC or 600VAC rms.
±(0.8% rdg + 5)
-33-
Replacing the Fuses
3. Safety Symbols
Warning
Symbols used on the meter and in this manual are explained in
Table 2.
To avoid electrical shock or damage to the meter, only use
replacement fuses ∅5x20 0.5A/250V FAST or ∅6x25 10A/250V FAST.
Table 2. International Electrical and Relative Symbols
!
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:
~
h
AC (Alternating Current)
!
Important Information
DC (Direct Current)
Caution, risk of electric shock
European Safety Standard
Earth Ground
Double Insulated
+–
The symbol indicating separate
collection for electrical and
electronic equipment.
Low Battery Indicator
U.S. Safety Standard
4. Front Plate of Meter
∅5x20 0.5A/250V FAST or ∅6x25 10A/250V FAST.
5. Reinstall the back case. Secure the back case by turning the
screws clockwise.
LCD Display
Screw
Screws
Elenco® Fuse Part #
0.5A/250V ∅5x20
fast blow
533004
10A/250V ∅6x25
fast blow
531101
Figure 19. Fuse Replacement
-32-
Function Press
Button
Function
Rotary Switch
Input Terminal
Figure 1. Front plate of the meter
-5-
Input Terminal
9. Maintenance
About terminal function refer to Table 3 and Figure 2.
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.
Figure 2. Input Terminal
Replacing the Batteries
Replace the batteries with two “AA” batteries (R6P) or equivalent.
!
Table 3. Input Terminal
Terminal
Function Description
V / Ω / Hz
Volts, ohm, diode, frequency, DUTY, temperature and
/ / ) /°F/°C 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
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.
Screw
Battery: Two R6P
(AA) or equivalent
Figure 18. Battery Replacement
-6-
-31-
Function Rotary Switch
About function rotary switch refer to Table 4 and Figure 3.
Figure 3. Function Rotary Switch
Position of Switch
~V
Ω
)
Hz
Figure 17. Temperature Measurement
-30-
Function
DC/AC voltage measurement
Resistance measurement, diode test, testing for continuity
Capacitance measurement
Frequency measurement / Duty cycle measurement
Table 4. Function Rotary Switch Symbols
-7-
Table 4. Function Rotary Switch Symbols (continued)
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
Function Press Button
About press function button refer to Figure 4.
Figure 16. Duty Cycle Measurement
Measuring Temperature
Figure 4. Function Press Button
1. SELECT (state choice)
There are several functions at one rotary switch position; press the
Ω
, Hz, TEMP
SELECT button to select the desired function: ~V,
°F/°C ,
μA~, mA~, A~ range for AC or DC voltage, AC or DC current,
resistance, diode, or audible continuity measurement.
!
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. 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-
TEMP
2. Set the Function Rotary Switch to the °F/°C 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 –58OF~+1292OF.
4. Unplugging the thermocouples will display the ambient
temperature at the meter terminals.
-29-
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.
Signal
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.
Figure 15. Duty Cycle Measurement
-28-
-9-
LCD Display
Measuring Frequency
About function rotary switch refer to Table 5 and Figure 5.
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.
7
8
9
10
11
12
6
To measure frequency, proceed as follows:
5
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.
13
4
14
3
2
15
1
16
Figure 5. LCD Display
Table 5. LCD Display Symbols
Sequ. No.
Symbol
1
8.8.8.8
2
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.
Description
The display digit group
FREQ.
Auto power off indicator
Auto range indicator
3
Auto
4
–
5
AC
AC (Alternating Current) indicator
6
DC
DC (Direct Current) indicator
7
+–
Battery power is weakening
Negative symbol
8
Relative measurement
9
Data hold
10
Diode symbol
11
Audible continuity function indicator
12
%
13
°C °F
Percent symbol
Temperature measurement
-10-
Figure 14. Frequency Measurement
-27-
Table 5. LCD Display Symbols (continued)
Sequ. No.
Symbol
14
Ω / KΩ / MΩ
Hz / KHz / MHz
15
mV / V
nF / μF
μA / mA / A
CAP
+
–
Description
Resistance units
Frequency units
Voltage units
Capacitance units
Current units
16
Overload
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
Figure 13. Capacitance Measurement
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.
-26-
-11-
• 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 capacitance <40μF
Measuring capacitance <100μF
Measuring time is about 2 seconds
Measuring time is about 7 seconds
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).
Measuring DC Voltage
1. Turn on the meter, then set up the meter to measure DC volts as
shown in Figure 6.
Testing for Continuity
2. Insert the black test lead into the COM terminal and the red test
lead into the
terminal.
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.
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.
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.
V
ON
OFF
Figure 6. DC Voltage Measurement
Figure 12. Continuity Test
-24-
-13-
Testing Diodes
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.
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.
Forward Bias
Reverse Bias
+
–
–
Figure 11. Diode Test
-14-
-23-
+
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.
Ω
position (then, “AUTO”,
3. Set the Function Rotary Switch to the
“ ”, “OL”, and “MΩ” symbols are indicated on the display).
V
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.
Ω
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.
Figure 10. Resistance Measurement
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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.
A
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.
Figure 9. AC Current Measurement (continued)
Measuring Resistance
!
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.
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.
To measure AC or DC current, proceed as follows:
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Note: To avoid blowing the meter’s 500mA fuse, use the mA
terminal only if you are sure the current is less than 400mA.
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.
μA
mA
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
Figure 9. AC Current Measurement
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Rotary Switch
Input
Ranges
μA~
μA / mA
400μA / 4000μA
mA~
μA / mA
40mA / 400mA
A~
10A
4A / 10A
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A
μA
mA
Figure 8. DC Current Measurement (continued)
Measuring AC Current
Figure 8. DC Current Measurement
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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.
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