Tenma 72-8715 Bedienungsanleitung

Model: 72-8715

Digital Bench Multimeter

Please read these instructions carefully before use and retain for future

reference.

• This meter is designed to meet IEC61010-1, 61010-2-032, and 61010-2-033 in

Pollution Degree 2, Measurement Category (CAT I 1000V, CAT II 600V, CAT III

300V) and double Insulation.

• When using electrical appliances basic safety precautions should always be

followed.

• Please operate according to this manual, otherwise the protection provided by the

device will be impaired or fail.

• There are no user-serviceable parts in this product. Refer servicing to qualied

personnel.

• Use only the test leads supplied or the protection may be impaired.

• Check the test leads, probe and case insulation condition before using. If you nd

any breakage, damage or abnormality, or you consider the device is broken, stop

using the device immediately.

• When using the test probes, keep your ngers behind the nger protection rings.

• Ensure all inputs are less than the range selected otherwise it may cause electrical

shock or meter damage.

• Take caution when voltages are above 60V DC and 30V AC rms.

• Do not use the meter with the battery or fuse covers removed.

• Do not adjust the range selector during measurement.

• Replace the batteries as soon as the low battery indicator appears on the display.

• Remove dead batteries from the meter or if it is not going to be used for a long

time.

• Never mix old and new batteries together, or different types of batteries.

• Never dispose of batteries in a re, or attempt to recharge ordinary batteries.

• Before replacing the battery, turn off the meter and disconnect all the test probes

• To prolong battery life turn off the meter after use.

ELECTRICAL SYMBOLS GUIDE

WHAT’S INCLUDED

• Bench type digital multimeter.

• Operating manual.

• Power supply unit.

• Alligator clips (1 pair).

• Multi purpose socket.

• Test leads (1 pair).

IMPORTANT SAFETY INFORMATION

AC or DC Ground Double insulated

Continuity test

Low batteryWarning

Capacitance testDiode test Fuse

Range Selector Positions Function

V AC and DC voltage measurement

Continuity test

Diode test

Resistance/continuity measurement

Capacitance test

Hz Frequency measurement

FCapacitance measurement

ºC Temperature in celsius

hFE Transistor test

A AC or DC current measurement

FUNCTIONS

OPERATING PARAMETERS

UNITS OF MEASUREMENT

• Ambient temperature : 0ºC ~ 40ºC.

• Relative humidity : ≤75% @ 0ºC ~ 30ºC, ≤50% @ 30ºC ~ 40ºC

• Maximum operating altitude 2000m

• Maximum Display : Digital: 1999

• Measurement Speed : Updates 2-3 times/second

• Polarity display : Automatic

Function buttons Operation performed

POWER Turn the power on and off

LIGHT Turn display back light on and off

HOLD To enter or exit range hold in any mode

mV,V Unit of Voltage: The millivolt, volt

μA,mA,A Unit of current: Microampere, milliampere, ampere

Ω,kΩ,MΩ Unit of electrical resistance: Ohm, thousand ohms, trillion ohm

nF,μF Unit of electrical capacity: Accepts the farad, the microfarad

kHz Unit of Frequency: Kilohertz

OC Unit of Temperature: Degree Celsius

βFactor Unit of Triode enlargement: Times

LCD Display Range Selector

Hold Button

Input Terminals

Light Button

Power Button

Symbol Terminal input Explanation

VV ←→ COM DC Voltage Measurement

V~ V ←→ COM AC Voltage Measurement

V ←→ COM Resistance Measurement

V ←→ COM Diode / Continuity Buzzer Measurement

kHz V ←→ COM Frequency Measurement

AmA μA ←→ COM mA/μA DC Current Measurement

10A ←→ COM A DC Current Measurement

A~ mA μA ←→ COM mA/μA AC Current Measurement

10A ←→ COM A AC Current Measurement

FV ←→ mA μA

(Use Multi-Purpose Socket) Capacitance Measurement

ºC V ←→ mA μA

(Use Multi-Purpose Socket) Temperature Measurement

hFE V ←→ mA μA

(Use Multi-Purpose Socket) Triode Enlargement Factor Measurement

OPERATION

DC or AC Voltage Measurement

Warning: To avoid personal injury, or damage to the meter from electric shock, please

do not attempt to measure voltages higher than 1000V although readings may be

obtained.

To measure DC/AC voltage, connect the meter as follows:

• Insert the red test lead into the V terminal and the black test lead into the COM

terminal.

• Set the rotary switch to V to select DC measurement mode.

• Set the rotary switch to V~ to select AC measurement mode.

• Connect the test leads across with the object being measured. The measured

value shows on the display.

• When DC/AC voltage measurement has been completed, disconnect the

connection between the test leads and the circuit under test.

Note: In each range, the meter has an input impedance of 10M

. This loading effect

can cause measurement errors in high impedance circuits. If the circuit impedance is

less than or equal to 10k

, the error is negligible (0.1% or less).

DC or AC Current Measurement

Warning: Before connecting the meter in series with the circuit under test, be sure

power the circuit is off. If the fuse burns out during measurement, the meter may be

damaged and there is risk of personal injury to the operator.

Use correct terminals, function, and range for the measurement. When the test leads

are connected to the current terminals, do not connect in parallel across any circuit.

To measure current, do the following:

• Insert the red test lead into the mA μA terminal and the black test lead into the

COM terminal.

• Set the rotary switch to an appropriate measurement position in μA , mA or

A to select AC or DC measurement mode.

• Connect the test leads in series with the object being measured. The measured

value shows on the display.

Note: If the value of current to be measured is unknown, use the maximum

measurement position, and reduce the range step by step until a satisfactory reading is

obtained.

• When current measurement is complete, disconnect the test leads from the circuit

under test.

Measuring Resistance.

To measure resistance, connect the meter as follows:

• Insert the red test lead into the

terminal and the black test lead into the COM

terminal.

• Set the rotary switch to select

measurement mode.

• Connect the test leads across with the object being measured. The measured

value shows on the display.

Note: When measuring low resistances, the test leads and internal wiring will add

approximately 0.1 ~ 0.2

of error. To obtain accurate readings in low-resistance, short-

circuit the test lead beforehand and record the reading obtained, call this reading as

X. Then use the equation: measured resistance value (Y) – (X) = accurate readings of

resistance.

• If reading with shorted test leads is not < 0.2

, check for loose test leads or

possible incorrect function selection.

• When measuring high resistance (>1M

), it is normal to take several seconds to

obtain a stable reading.

• The LCD displays OL indicating open-circuit or the resistor value is higher than the

maximum range of the meter.

• When resistance measurement has been completed, disconnect the connection

between the test leads and the circuit under test.

Continuity Test

To test for continuity, connect the meter as below:

• Insert the red test lead into the

terminal and the black test lead into the COM

terminal.

• Set the rotary switch to to select

continuity

measurement mode.

• Connect the test lead across with the object being measured. The buzzer sounds if

the resistance of a circuit under test is <10

, the circuit is in good condition.

• The measured value shows on the display and the unit is

• When continuity testing has been completed, disconnect the connection between

the test leads and the circuit under test.

Warning: To avoid damage to the meter or to the devices under test, disconnect circuit

power and discharge all the high-voltage capacitors before measuring resistance.

To avoid possible injury, please do not attempt to input voltages higher than 60V DC or

30V AC.

Diode Test

Perform the diode test to check diodes, transistors, and other semiconductor devices.

The diode test sends a current through the semiconductor junction, and then measures

the voltage drop across the junction. A good silicon junction drops between 0.5V and

0.8V.

To test a diode out of a circuit, connect the meter as follows:

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

• Set the rotary switch to to select diode test measurement mode.

• For forward voltage drop readings on any semiconductor component, place the

red test lead on the component’s anode and place the black test lead on the

component’s cathode. The measured value shows on the display.

• Note Connect the test leads to the proper terminals as said above to avoid error

display.

• The LCD will display OL indicating diode being tested is open or polarity is

reversed. The unit of diode is Volt (V), displaying the forward voltage drop

readings.

• Open circuit voltage is around 2.7V.

• When diode testing is completed, disconnect the test leads from the device under

test.

Capacitance Measurement

To measure capacitance, connect the meter as follows:

• Use the multi-purpose socket and connect to the V and mA μA terminals.

• Set the rotary switch to F.

• Connect the test leads across with the object being measured. The measured

value shows on the display.

• When measuring capacitance values larger than 600uF, it is normal for the meter

to require some time to stabilize.

• The LCD displays OL indicating the tested capacitor is shorted or it exceeds the

maximum range.

• When capacitance measurement has been completed, disconnect the test leads

from the device under test.

Note: The Meter displays a xed value which is the value of the meters own internal

circuitry. To ensure accuracy, it is necessary to subtract this value from the displayed

value when measuring small capacitors.

Frequency Measurement

Warning: To avoid the risk of personal injury, do not attempt to measure frequency with

voltage higher than 30V RMS.

To measure frequency, connect the meter as follows:

• Insert the red test lead into the Hz terminal and the black test lead into the COM

terminal.

• Set the rotary switch to Hz to select Frequency measurement mode.

• Connect the test leads across with the object being measured. The measured

value shows on the display.

• When frequency measurement is complete, disconnect the test leads from the

circuit under test.

Temperature Measurement

To measure temperature, connect the meter as follows:

• Set the rotary switch to ºC to measure degree celsius temperature.

• Insert the multi-purpose socket into the corresponding Hz and COM terminal.

• Insert the temperature probe to the corresponding input terminal of the multi-

purpose socket. Take care to ensure that proper polarity is observed when

connecting to this socket.

• Place the temperature probe to the object being measured. The measured value

shows on the display after few seconds.

• The included point contact temperature probe can only be used under 230ºC.

• For any measurement higher than that, the rod type temperature probe must be

used instead.

• When temperature measurement has been completed, disconnect the connection

between the temperature probe, multi-purpose socket and the circuit under test

and remove the multi-purpose socket from the input terminal.

Note

The testing environment must between 18ºC to 28ºC to ensure accuracy especially

when measuring low temperature. Different reading may be obtained when testing

room environment under short or open circuit situation, then short-circuited reading

shall be considered as the correct reading.

Turning on the Display Backlight

Warning: In order to avoid the hazard arising from mistaken readings in low light

situations, please use display backlight function.

• Press LIGHT button to turn the display backlight on.

• Press LIGHT button again to turn the display backlight off.

• When using the AC power, the display backlight always stays on.

Measuring Transistor

To measure transistor, connect the meter as follows:

• Insert the multi-purpose socket into the μAmA and Hz input terminal.

• Set the rotary switch to hFE.

• Insert the NPN or PNP type transistor to be tested into the corresponding input

terminals of the multipurpose socket.

• The measured nearest transistor value shows on the display.

• When transistor measurement has been completed, remove the tested transistor

from the multi-purpose socket and remove the multi-purpose socket from the input

terminal.

SPECIFICATION

DC Voltage

Range Resolution Accuracy Overload Protection

200mV 0.1mV

(0.5%+2) 1000V

Input impedance: ~10M

2V 1mV

20V 10mV

200V 100mV

1000V 1V

(0.8%+3)

AC Voltage

2V 1mV

(0.8%+3)

750V

Input impedance: ~10M

Frequency: 45Hz to 400Hz

Display True RMS

20V 10mV

200V 100mV

1000V 1V

(1.0%+4)

DC Current

200μA

0.1μA

(0.8%+2) Fuse 500mA, 250V

fast type, f5x20mm

2mA 1μA

20mA 10μA

200mA 0.1mA

10A 10mA

(2.0%+4) Fuse 10A, 250V

fast type, f5x20mm.

AC Current

2mA

1μA

(1.0%+3) Fuse 500mA, 250V, fast

type, 5x20mm.

20mA 10μA

200mA 0.1mA

10A 10mA

(2.5%+5) Fuse 10A, 250V,

fast type, 5x20mm.

Resistance

Range Resolution Accuracy Overload Protection

200Ω

0.1

(0.8%+3) 250V rms

0.001k

20k

0.01k

200k

0.1k

0.001M

20M

0.01M

Ω±

(1.2%+5)

200M

Capacitance

20nF 10pF

(4%+3) 250V rms2μF 1nF

200μF 100nF

(5%+5)

Frequency

2kHz 1Hz

(1.5%+5) 250V rms

200kHz 100Hz

Temperature

ºC 1ºC

-40ºC to -20ºC

(8%+5)

250V rms

>20ºC to 0ºC

(1.2%+4)

>0ºC to 100ºC

(1.2%+4)

>100ºC to 1000ºC

(2.5%+10)

Continuity Test

Range Resolution Overload Protection Remarks

250V rms

Open circuit voltage

approximate 3V.

When circuit disconnected

with resistance

value >100

buzzer does not sound.

When circuit is in good

connection with resistance

value 10

buzzer sounds

continuously

Diode Test

1mV 250V rms Open circuit voltage

approximate 3V.

Transistor

hFE 1ßFuse 500mA, 250V

fast type, 5x20mm

Vce 2.5V, 1bo 10μA

1000ßMAX

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