Tenma 72-7780 Manuel utilisateur

True RMS Digital Multimeter

Model: 72-7780

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

Pollution Degree 2, Measurement Category (CAT II 600V, CAT III 600V) and double

Insulation.

• Do not operate the meter or use test leads if they appear damaged, or if the meter

is not operating properly.

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

personnel.

• Do not apply voltage between the COM and OHM terminals, while in the

resistance measuring state.

• Do not measure current with the test leads inserted into the voltage or OHM

terminals.

• To avoid electrical shock and personal injury, do not attempt to measure voltage

higher than 600V AC/DC, although the readings may be obtained.

• Do not expose the instrument to direct sunlight, extreme temperature or humidity.

• Before measuring current, check the fuses and turn the power to the circuit off

before connecting the meter to the circuit.

• Disconnect circuit power and discharge all high voltage capacitors before testing

continuity. diode, resistance, capacitance or current.

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

• Do not use the meter around explosive gas or vapour.

• When using the test leads, keep your ngers behind the nger guards.

• Remove test leads from the meter before opening the meter case or battery door.

• Never operate the meter with the cover removed or the battery door open.

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

• Probe assemblies for mains measurements shall be rated as appropriate for

measurement category III according to IEC 61010-031 and shall have a voltage

RATING of at least the voltage of the circuit to be measured.

• 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.

SAFETY INFORMATION

Please read these instructions carefully before use and retain for future

reference.

WHAT’S INCLUDED

• Digital multimeter

• User manual

• Cat III 600V test lead

• Point type K thermocouple

• Current clamp

SYMBOL GUIDE

AC or DC

Grounding

Double insulated

Warning

Low battery

Continuity Buzzer

Diode

Fuse

Conforms to European Union directives

FUNCTIONS

1. Casing

2. LCD Display

3. Function buttons x 4

4. Option buttons

5. Range selector

6. Test lead input terminals

Ω

Vµ

-8

MAX-MIN Auto Range NCV A

Display symbol Instruction

Data hold prompt

Negative reading

AC/DC AC/DC measurement

MAX-MIN Max/Min value measurement prompt

Low voltage internal battery

Auto Range Uto range prompt

Display symbol Instruction

Diode measurement prompt

Circuit on/off measurement prompt

rRelative measurement prompt

Ω / kΩ / MΩ Resistance units

Hz / kHz / MHz Frequency units

%Duty ratio measurement unit

mV / V Voltage units

µA/mA/A Current units

nF/µF/mF Capacitance units

oCCentigrade temperature unit

oFFahrenheit temperature unit

(EF)NCV non contact AC voltage sensing

Auto power off

Current clamp

RANGE button

• The range button selects between auto and manual range when measuring

voltage, impedance or resistance.

• Press it repeatedly to select high range or low range.

• Press and hold for more than 2 seconds and the meter will exit manual range.

MAX/MIN button

• This button is used to switch into the manual range mode when auto shutdown is

disabled. Voltage, resistance, impedance and temperature

• The maximum value is displayed initially.

• Pressing the button again displays the minimum value.

• Press and hold for more than 2 seconds and the meter will exit data recording

mode.

REL button

• Press to enter the manual range mode. The displayed value will be taken as

reference value and the difference between the reference value and the measured

value will be displayed.

• Press again to exit the measurement mode.

Hz/% button

• Press to switch between measurement of frequency, AC voltage/current modes.

Select button

• Used to select between UFC and VFC modes when measuring AC voltage.

• Press and hold for 2 seconds to switch between modes or end the selection.

HOLD button

• Lock and hold the displayed value, press again to return to normal.

OPERATING PARAMETERS

• Operating temperature: 23°C± 5°C

• Relative Humidity: ≤75%.

• Temperature Coefcient: 0.1× (specied accuracy)/1°C

DC VOLTAGE

Range Resolution Accuracy Overload Protection

60.00mV 10µV ±(0.5%+2)

600V DC/AC

600.00mV 0.1mV

6.000V 1mV

±(0.7%+3)

60.00V 10mV

600.0V 0.1V

600V 1V

Note: The input impedance is 10MΩ.

AC VOLTAGE

Range Resolution Accuracy Overload Protection

60.00mV 10µV ±(1.0%+3)

600V DC/AC

600.0mV 0.1mV

6.000V 1mV

±(0.8%+3)60.00V 10mV

600.0V 0.1V

600V 1V ±(1.0%+3)

VFC 200.0V~600V ±(4.0%+3) 0.1/1V

Notes:

• Input Impedance: ~10MΩ

• Frequency Response: 45Hz~1KHz (VFC: 45~400Hz)

• Maximum input voltage: 600Vrms

RESISTANCE

Range Resolution Accuracy Overload Protection

600.0Ω 0.1Ω ±(1.0%+2)

600Vp

6.000kΩ 1Ω

±(0.8%+2)60.00kΩ 10Ω

600.0kΩ 100Ω

6.000MΩ 1kΩ ±(1.2%+2)

60.00MΩ 10kΩ ±(1.5%+2)

Range Resolution Accuracy Overload Protection

1mV Displays approximate

forward voltage drop 600Vp

Range Resolution Accuracy Overload Protection

9.999nF 1pF Under REL status

±(4%+10) 600Vp

99.99nF~999.9µF 10pF~0.1µF ±(4%+5)

9.999nF~99.99mF

1µF~10µF ±10%(≤2mF)

DIODE AND CONTINUITY

Range Resolution Accuracy Overload Protection

0.1Ω When ≤10Ω, the

buzzer beeps. 600Vp

Notes:

• The open circuit voltage is about *1V.

• The buzzer may beep when the resistance of a circuit under test is <10Ω.

• The buzzer does not beep when the resistance of a circuit under test is higher

than 150Ω.

Notes:

• The normal voltage drop of a good silicon junction is about 0.5~0.8V.

FREQUENCY/DUTY RATIO

CAPACITANCE

CURRENT CLAMP MEASUREMENT

Range Resolution Accuracy Overload protection

0.1%~99.9% 0.1% For reference only 600Vp

9.999Hz~9.999MHz 0.001Hz~0.001MHz

±(0.1%+4)

Input range a: (DC level zero)

• ≤100kHz: ≥100mVrms≤ a ≤20Vrms

• >100kHz~1MHz: ≥200mVrms≤ a ≤20Vrms

• >1MHz: 500mVrms≤ a ≤20Vrms

• 5MHz~10MHz: 900mVrms≤ a ≤20Vrms

Note:

• Duty ratio % only applicable for measurement ≤100kHz

• During measurement of AC voltage or current, to read online frequency or duty

ratio the following input should be met:

Frequency response: ≤1kHz

Range Resolution Accuracy Overload Protection

60A DC 0.01A ±(1.0%+3) 600Vp

60A AC ±(1.2%+3)

DC CURRENT

AC CURRENT

TEMPERATURE MEASUREMENT

Range Resolution Accuracy

oC -40~1000oC

-40~0oC

1oC

±3

>0~100oC±(1.0%+3)

>100~1000oC±(2.0%+3)

oF -40~1832oF

-40~32oF

1oF

±5

>32~212oF±(1.5%+5)

>212~1832oF±(2.5%+5)

Note:

• The K type point (Ni-Cr and Ni-Si) thermocouple in only

applicable for the measurement of temperature under

230oC/446oF.

Note:

• Frequency response: 45~1kHz

• Display : true RMS

Range Resolution Accuracy Overload Protection

600.0µA 0.1µA

±(0.7%+2)

600V DC/AC

Fuse 0.6A

Fuse 10A

6000µA 1µA

60.00mA 10µA

600.0mA 0.1mA

±(1.0%+3)

6.000A 1mA

10.00A 10mA

Range Resolution Accuracy Overload Protection

600.0µA 0.1µA

±(1.0%+3)

600V DC/AC

(<1A range) Fuse 0.6A

(>10A range) Fuse 10A

6000µA 1µA

60.00mA 10µA

600.0mA 0.1mA

±(1.2%+3)

6.000A 1mA

10.00A 10mA

Internal Fuse Check

• By using the resistance measurement function, the state of

the internal fuses can be tested.

1. Turn the range selector to Ω.

2. Connect the test leads as shown to check each fuse.

OPERATION

Measuring DC/AC Voltage

• To measure DC/AC voltage, perform the following steps:

1. Insert the red test lead into the VΩHzoCterminal and the black test lead into

the COM terminal.

2. Turn the range selector to mV~measurement

mode and connect the test probes in parallel

with the object being measured. The measured

value shows on the display. Press REL to

switch from auto range as default to manual

range during the measurement if required.

3. When the load impedance is ~10MΩ the load

may cause measurement errors, but it is so

low it can be ignored if the circuit impedance is

under 10k.

Note:

• When a measurement has been completed,

disconnect the test probes from the circuit under test, and remove the test leads

from the input terminals.

• Do not attempt to measure voltages over 600Vrms as although a measurement

may be given, the meter may be damaged.

Measuring Resistance

• To measure the resistance, perform the following steps:

1. Insert the red test lead into the VΩHzoCterminal

and the black test lead into the COM terminal.

2. Turn the range selector to Ω. Press REL to

switch from auto range as default to manual range

during the measurement if required.

3. Connect the test probes with the object being

measured. The measured value shows on the

display.

4. If measuring low resistance the test leads will add

about 0.1Ω~0.2Ω to the reading. To obtain an

accurate reading, short the test probes and use the

REL measurement mode.

Notes:

• OL is displayed if the reading is out of range.

• Turn off all power to the circuit under test and discharge all capacitors before

connecting the meter.

• To obtain a more precise reading, you could remove the object being measured

from the circuit when measuring.

• When a measurement has been completed, disconnect the test probes from the

circuit under test, and remove the test leads from the input terminals.

• Do not exceed 60VDC or 30VAC in this mode.

Measuring Continuity

• To measure continuity, perform the following steps:

1. Insert the red test lead into the VΩHzoC terminal and the black test lead into

the COM terminal.

2. Turn the range selector to measurement

mode and connect the test probes to the object

being measured.

3. Press SELECT to switch to continuity

measurement mode if needed.

4. The measured value shows on the display.

5. The buzzer will sound if the resistance of a

circuit under test is less than 10Ω.

6. The buzzer may sound if the resistance of a

circuit under test is between 10Ω and 150Ω.

7. The buzzer does not sound if the resistance of a

circuit under test is higher than 150Ω.

Note:

• Turn off all power to the circuit under test and discharge all capacitors before

connecting the meter.

• When a measurement has been completed, disconnect the test probes from the

circuit under test, and remove the test leads from the input terminals.

Diode Check

• Use the diode test mode to check diodes, transistors and other semiconductor

devices. In diode test mode, a current is sent through the semiconductor junction

and the voltage drop across the junction is measured.

• A good silicon junction drop is between 0.5V and 0.8V.

• To test a diode out of a circuit, perform the following

steps:

1. Insert the red test lead into the VΩHzoC terminal

and the black test lead into the COM terminal.

2. Turn the rotary switch to . Press SELECT to

switch to diode measurement mode if needed.

3. For forward voltage drop readings on any

semiconductor component, connect the red test

probe to the component’s anode and the black

test probe to the cathode.

Notes:

• Test voltage for diode check is ~3.2V.

• Turn off all power to the circuit under test and discharge all capacitors before

connecting the meter.

• When a measurement has been completed, disconnect the test probes from the

circuit under test, and remove the test leads from the input terminals.

Duty Cycle measurement

• To measure duty cycle, perform the following steps,

1. Insert the red test lead into the terminal

and the black test lead into the COM terminal.

2. Turn the rotary switch to Hz to select duty cycle

measurement mode.

3. Connect the test probes with the object being

measured. The measured value shows on the

display.

Note:

• When a measurement has been completed, disconnect

the test probes from the circuit under test and remove

the test leads from the input terminals.

Temperature measurement

• To measure temperature, perform the following steps:

1. Insert the red Thermocouple lead into the VΩHzoC

terminal and the black lead into the COM terminal.

2. Turn the rotary switch to oCoFto select temperature

measurement mode.

3. The measured value shows on the display.

Note:

• When a measurement has been completed, disconnect

the thermocouple from the circuit under test and remove

the test leads from the input terminals.

Capacitance measurement

• To measure the resistance, perform the following steps:

1. Insert the red test lead into the VΩHzoCterminal

and the black test lead into the COM terminal.

2. Turn the range selector to , the meter and leads

will display a xed internal capacitance. Press

REL to switch to relative measurement which

will automatically deduct this value from the

measured value.

3. Connect the test probes with the object being

measured. The actual value shows on the display.

4. Several seconds may be needed to measure a high value capacitor.

Notes:

• OL is displayed if the reading is out of range.

• Turn off all power to the circuit under test and discharge all capacitors before

connecting the meter.

• When a measurement has been completed, disconnect the test probes from the

circuit under test and remove the test leads from the input terminals.

AC and DC Current measurement

• To measure current, perform the following steps,

1. Turn the rotary switch to Aand press SELECT to switch between DC

(as default) and AC RMS measurement mode.

2. Connect the red test lead to either mA or Aterminal and the black lead into

the COM terminal.

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