Tenma 72-8720 Manuel utilisateur

Model: 72-8720

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.

• Installation guide and computer interface software (CD-ROM).

• Operating manual.

• Power cord.

• Alligator clip.

• Multi purpose socket.

• Temperature probe.

• Test leads (1 pair).

• RS232 interface cable.

• USB interface cable.

IMPORTANT SAFETY INFORMATION

AC or DC Ground Double insulated

Continuity test

Low batteryWarning

Capacitance test

Diode test Fuse

}Stored in compartment in the back of the unit.

FUNCTIONS

Function buttons Operation performed

SELECT SELECT: used to select any rotary switch alternate function

LIGHT LIGHT: under battery power turns backlight on

RANGE Exit AUTO and enter MANUAL ranging. In MANUAL select next

input range. Press EXIT to return to AUTO (default)

STORE Stores the current measurement value. Press EXIT to return

RECALL Recall the stored value. Press EXIT to return

SETUP Access setup selections. Display ‘SET’ is ashing. Each press

moves to the next selection.

SEND Press to output data, AUTO mode off. Press EXIT to quit

In SETUP press to select OFF at selection of HIGH and LOW

MAXMIN

Displays max/min and current reading. Press exit to quit

In SETUP each press select next digit

In RECALL press to enable SEND feature

In STORE press to switch between clearing or start storing

reading from current index number

REL

Enter RELATIVE mode. Upper right secondary display shows

present value. Lower right secondary display shows stored

value. Primary display shows present measurement minus

stored value. Press EXIT to quit mode.

Range Selector

Positions

Rotary Switch Function Blue SELECT Function

DC voltage measurement None

AC voltage measurement None

Hz Duty

DC millivolt measurement Frequency measurements

Duty Cycle measurement

Resistance measurement Diode test

Continuity test

Capacitance test None

ºC ºF Centigrade temp measurement Fahrenheit temp measurement

μA

AC or DC current

measurement (40ma, 400ma)

Switch between AC or DC

mA %

AC or DC current

measurement (40ma, 400ma)

Switch between AC or DC

4-20mA loop as % reading

AAC or DC current

measurement (10A)

Switch between AC or DC

Function buttons Operation performed

REL

In SETUP each press decrements an option

In RECALL each press goes back to previous reading

In STORE each press decreases a second on the storing

interval. Press EXIT to exit.

HOLD HOLD freezes the displayed value. Press EXIT to release.

PEAK Press to access Peak Hold feature. Primary display shows peak

hold reading. Press EXIT to quit.

EXIT Press to exit certain button functions.

AC/DC In AC measurement mode press to display AC+DC True RMS

value and AC+DC.

OPERATING PARAMETERS

FRONT PANEL LAYOUT

• Ambient temperature : 0ºC ~ 40ºC.

• Relative humidity : ≤75% @ 0ºC ~ 30ºC, ≤50% @ 31ºC ~ 40ºC

• Maximum operating altitude 2000m

• Maximum Display : Digital: 5999

• Measurement Speed : Updates 2-3 times/second

• Polarity display : Automatic

• Turn the Range Selector to power the meter on and select a function. The display

initially shows a standard setup for that function.

• Use the blue SELECT button to choose an alternate function for the chosen

setting.

• Changing the main setting does not carry over the alternative function setting.

LCD Display

Function Buttons

Range Selector

Select Button

Input Terminals AC/AC+DC Button

SELECT RANGE STORE RECALL SETUP

Function Primary Display Lower right

Secondary Display

Upper right Secondary

Display

DCV Tested DC Voltage value No Display Full range: 4,40,400,1000

ACV Tested AC Voltage value

Tested frequency

value: 40kHz ~

250kHz

Full range: 4,40,400,750

DCmV Tested DCmV value No display Full range: 400

Tested resistance value No display Full range: 400, 4, 40, 400,

4, 40

Tested resistance value No display Full range value: 400

Tested resistance value No display Full range: 4

Hz Tested frequency value No display Full range: 40, 400, 4, 40,

400, 4, 40, 400

Tested capacitance value No display Full range: 40, 400, 4, 40,

400, 4, 40

ºC Tested ºC value No display 1000

ºF Tested ºF value No display 1832

μA

Tested DC

μA value

N/A Full range: 400, 4000

μA

Tested AC

μA value

Tested frequency

value 40kHz ~ 100kHz Full range: 400, 4000

DCmA Tested DCmA value No display Full range: 40, 400

ACmA Tested ACmA value Tested frequency

value 40kHz ~ 100kHz Full range: 400, 4000

DCA Tested DC current value No display Full range: 10

ACA Tested AC current value Tested frequency

value 40kHz ~ 100kHz Full range: 10

STORE Current measurement

reading

Value of the

corresponding index

number

Index number increase one.

Index number:

no.0001~9999

RECALL The recalled value The total number of

stored value

Index number:

no.0001~9999

Max/min Current measurement

reading

Minimum reading

value Maximum reading value

REL Present measurement

value minus stored value The stored value Present measurement value

Symbol Meaning

MAX Maximum reading displayed

MIN Minimum reading displayed

No The sequence of reading

ºC, ºF Degrees celcius (default) or fahrenheit

μmS

H: hour

μ: micro

m: minutes

S: seconds

- Negative reading

Low battery - replace as soon as possible to avoid inaccurate

readings.

SET Setup feature is enabled

AC+DC

For DCV and DCA functions, reading represents trueRMS total of AC

and DC measurements

True RMS Indicator for true RMS value

Ω, kΩ, mΩ

Ohm unit of resistance

Kiloohm 2x10

or 1000ohms

Megaohm 1x10

or 1,000,000ohms

Hz, kHz

MHz

Hertz unit of frequency measurement

Kilohertz

1x10

or 1000hertz

Megahertz

1x10

or 1,000,000hertz

V, mV Volts unit of measurement

Millivolt 1x10-3 or 0.001volts

μA, mA, A

Amperes unit of current

Milliamp 1x10-3 or 0.001amperes

Microamp 1x10

-6

or 0.000001amperes

F, mF

μF, nF

Farad unit of measurement

Nanofarad. 1x10

-9

or 0.000000001 farads

Microfarad.1x10-6 or 0.000001 farads

Millifarad. 1x10-3 or 0.001 farads

Automatic power off feature is turned on

Continuity test sounder

STO Data store is on

RCL Data recall is on

∆Relative mode displays present value minus stored value.

• Auto ranging (AUTO in the display) always comes on initially when you select a

new function. In auto range, the Meter selects the lowest input range possible,

ensuring that the reading appears with the highest available resolution.

• Press RANGE to enter MANUAL ranging in the present setting. You can then

select the next manual range higher by repeatedly pressing RANGE. Return to

auto ranging by pressing EXIT.

• Press RANGE when turning on the Meter, the Meter enters the analogue

resistance signal measurement mode.

OPERATION

DC 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 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 .

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

voltage’s true RMS value shows on the display.

• When 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

except 600mV range

has 3000M

. 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).

Symbol Meaning

LOW Indicates lowest setup limit

AUTO The meter is set to auto range with range for best resolution selected

SEND Data output in progress

Backlight feature is on

HOLD Data hold mode is active

PEAK HOLD Peak hold mode is active

Diode test

% Frequency signal duty cycle. 4~20mA loop current as % reading

>OL

Input value overload for the selected range

Analogue Bar Provides an analogue bar graph of the present input, quick response

Analogue Bar Graph

The bar graph provides an analogue indication of the measured input. For most

measurement functions, the bar graph updates 10 times per second.

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 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 ~.

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

voltage’s true RMS value shows on the display.

• When a ACV function is selected, you can press the AC+DC button to view the AC

+ DC True RMS value in the primary display.

• When 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

except 600mV range

has 3000M

. 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 Millivoltage Measurement

Warning: To avoid damage to the meter, please do not attempt to measure voltages

higher than 400mV although readings may be obtained.

To measure DC Millivoltage, 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 mV . Press the SELECT button to cycle through

frequency and duty cycle.

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

RMS value shows on the display.

• When measurement has been completed, disconnect the connection between the

test leads and the circuit under test.

•

Note: When measuring DC Millivoltage, the Meter acts around a 2.5G

input

impedance in parallel with the circuit.

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 μA mA terminal and the black test lead into the

COM terminal.

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

A , press SELECT button to select AC measurement mode. Default is DC.

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

value shows on the display.

• The measurement displays True RMS value.

• Press AC/AC+DC button to measure AC+DC current’s true RMS.

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.

• Each measurement time of high current (>5A) should be less than 10 seconds and

the interval time between 2 measurements should be greater than 15 minutes.

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

under test.

Measuring Resistance

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.

To measure resistance, connect the meter as follows:

• Insert the red test lead into the

terminal and black lead into the COM terminal.

• Set the rotary switch to

and press SELECT button to select

measurement

mode.

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

value shows on the display.

Continuity 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 testing for continuity.

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

30V AC.

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

and press SELECT button to select

measurement mode.

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

if the resistance of a circuit under test is <50

, the circuit is in good condition. The

buzzer does not sound if the resistance of a circuit under test is >50

, the circuit

is broken.

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

Note: In continuity mode, the resistance range is 400

, and the open circuit voltage is

approximately 1.2V.

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

the test leads and the circuit under test.

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 < 0.5

, 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 testing the resistance signal from the calibrator, it is necessary to press and

hold the RANGE while turning on the Meter to change the maximum display to

4000 counts but the accuracy remains unchanged.

• When resistance measurement has been completed, disconnect the connection

between the test leads and the circuit under test.

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