Tenma 72-10395 Manuale utente

Model 72-10395 Operating Manual

Pocket Size Digital Multimeter

Model: 72-10395

Model 72-10395 Operating Manual

Content

Ⅰ

.Rules for Safe Operation .......................................................................................1

Ⅱ

.Product Overview .....................................................................................................1

Ⅲ

.Functions ..............................................................................................................................2

A. ....................................................................................................................O

utline structure .............................................................................................................2

B......................................................................................................................B

utton function descriptions ............................................................................................ 2

Ⅳ

.Technical Specifications............................................................................................3

A. ....................................................................................................................G

eneral specifications ...................................................................................................3

B......................................................................................................................A

ccuracy specifications .................................................................................................4

Ⅴ

. Operations ..........................................................................................................................5

1............................................................................................................................... D

C voltage measurement..............................................................................................5

2............................................................................................................................... A

C voltage measurement ...........................................................................................5

3............................................................................................................................... R

esistance measurement .............................................................................................6

4............................................................................................................................... F

requency and duty cycle measurement ..................................................................6

5............................................................................................................................... D

iode and continuity measurement ...........................................................................6

6............................................................................................................................... C

apacitance measurement...........................................................................................7

Ⅵ

. Battery Replacement .................................................................................................... 7

Model 72-10395 Operating Manual

I. Rules for Safe Operation

Please pay attention to the warning symbol and its corresponding contents.

Warning items state situations or actions that may cause potential danger to users or

lead to the meter or measured equipment damage.

72-10395 digital multimeter is designed and manufactured in accordance with IEC61010,

double insulation, CAT II 600V overvoltage and pollution grade 2 safety standard.

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

device will be impaired or fail.

1. Check if the wire, probe and case insulation functionis normal or not before using. If

you find it is obviously abnormal, or you consider the device is broken, do not use

the device any more.

2. Keep your fingers behind the protection ring when using test probes

3. To avoid electric shock and meter damage, do not apply voltage higher than 600V

between the terminals and the grounding.

4. Be careful when the measured voltage is above DC 60V and AC 42V RMS so as to

avoid electric shock.

5. Do not use the meter before the back cover is well installed.

6. No measured signal should be above the specified limits.

7. No stall change of rotary knob is allowed during measurement.

8. Do not change internal wiring without authorized permission. As it will cause meter

damage and user injury.

9. To ensure accurate readings, please change batteries timely if “” icon appears on

LCD.

10. Do not apply the meter in high temperature and humidity environments; especially

do not store it in moistenvironment so as to avoid meter degrading.

11. Clean the case with soft and wet cloth and mild detergent instead of abrasive or

dissolvent for maintenance.

Safety symbols

Low Battery Indicator Grounding Warning

Double Insulation

Buzzer Continuity Diode Capacitance

Conformity with European Union standards

II. Product Overview

72-10395 is a pocket sized3 3/4 bit auto range digital multimeter. It has many

advantages, such as stable performance, small size, lightweight, high accuracy, low

power consumption, safe and easy to operate, and more. It is an ideal tool for

Model 72-10395 Operating Manual

measuring AC/DC voltage, frequency, duty cycle, resistance, capacitance, diode,

forward voltage drop and continuity.

The manual has specified the rules for safe operation and notes. Please read it

carefully before using the device and strictly follow all warnings and notes during

operation.

Warning: Please read “Rules for Safe Operation” before operation.

III.Functions

A. Outline structure (See figure 1)

1. LCD display

2. Selecting resistance, capacitance, diode or continuity measurements (SELECT

button)

3. Relative value measurement (REL button)

4. Rotary knob

5. Hz/% measurement (DCV, ACV, and Hz/% stall)

6. Data Hold

7. Positive input end (red test probe)

8. Negative input end (black test probe)

B. Button Function Descriptions

1. SELECT button

It is used for function switching among resistance, capacitance, and buzzer continuity

and diode measurements, indicated by beeping during the operation.

Press the button to activate the device in standby mode and cancel the auto power off

function

2. REL button (Relative Value Measurement)

Model 72-10395 Operating Manual

Press the button, then the current reading is set as reference value which will be

automatically subtracted from subsequent measurement readings. Press it again to exit

and return to normal measuring mode. This function is not available during frequency

and duty cycle measurement.

3. Data Hold (HOLD Button):

Press this button to hold displayed values; press it again to exist hold status and return to

normal measuring mode.

4. Hz/% Measurement:

Press the button to switch to Hz or % measurement under DCV and ACV ranges(the Hz/%

buttoncan be used for measuring switching between frequency and duty cycle); when

Hz/% measurement is finished, the meter will return to DCV or ACV measuring mode

with the range being 400mVand 4V respectively and meanwhile “AUTO” icon on LCD

disappears. If high voltage measurement is needed at the moment, please turn rotary

knob or turn off the meter to reset autorang for V, μA, mA measurement before starting

the test.

Under Hz/% mode, press Hz/% button to switch between Hz and % measurement.

IV.Technical Specifications

A. General specifications

1. Max voltage between the voltage input terminal and ground: 600Vrms or 600 DCV

2. Range selection: Auto

3. Measuring rate: 3 times per second

4. Max display: 3999; 3 3/4 digits

5. Over range display:“OL”

6. Polar indication: “-”icon for negative input

7. Low battery display: “ ” icon on LCD

8. Internal battery: one Lithium-manganese button cell, 3V, model: CR2032

9. Operating temperature: 0℃~40℃(32℉~104℉), humidity ≤75%

Storage temperature: -10℃~50℃(14℉~122℉)

Operating altitude height: ≤2000m

10.Dimension: 109.8mm x 58.2mm x 10.8mm

11.Weight: about 76g (including test probes and battery)

12.Auto Power Off

The meter will enter the standby mode ifno operation with the rotary switch and

buttons within about 30 minutes. In the standby mode, it can be activated (i. e. enters

the working mode) by turning the rotary switch or pressing any buttons on the front

panel. But pressing SELECT button to activate the meter will cancel Auto Power Off

function.

B. Accuracy specifications

Accuracy: ± (a% readings+ b digits), 1-year warranty period

Ambient temperature: 23℃±5℃

Relative humidity:≤75%

Model 72-10395 Operating Manual

Function Range Resolution

Accuracy± (a%

readings +b

digits)

Input

Protection Description

Voltage

(DCV)

4V 1mV

± (0.8%+1) 600V DC

600V AC Input impedance≥10MΩ

40V 10mV

400V 100mV

600V 1V ± (1%+3)

Voltage

(ACV)

4V 1mV

± (1.2%+3) 600V DC

600V AC

Input impedance≥10MΩ;

Frequency response:

40~400Hz;

Display: RMS of sine

wave(mean value response)

40V 10mV

400V 100mV

600V 1V ± (1.5%+5)

Resistance

(Ω)

400Ω

0.1Ω

± (1.2%+2)

600V AC Open circuit voltage is about

0.45V

4kΩ1Ω

± (1%+2)

40kΩ10Ω

400kΩ100Ω

4MΩ 1kΩ± (1.2%+2)

40MΩ 10kΩ± (1.5%+2)

Function Range Resolution

Accuracy±

(a% readings

+b digits)

Input

Protection Description

Capacitance

CAP (F)

4.000nF 0.001nF

600V AC

For reference only

40.00nF 0.01nF

±(4%+3)

Measuring in relative

measuring mode, the open

circuit voltage is around 0.45V

400.0nF 0.1nF

4.000μF 0.001μF

40.00μF 0.01μF

100μF 0.1μF ±(5%+10)

When measured capacitance

is above“100μF”, the reading

is for reference only

Frequency

(Hz)

99.9Hz 0.1Hz

±(0.5%+3) 600V AC

Input sine wave,

10Hz~10kHz:≥1Vrms

10kHz~100kHz:≥30Vrms

0.999kHz 0.001kHz

9.99kHz 0.01kHz

99.9kHz 0.1kHz

Duty Cycle 0.1%~99.9% 0.10% 600V AC

Press DUTY buttonto switch to the

measuring mode when the knob is

turned to AC/DC stall (the reading is

for reference only)

Diode

1mV 0.5V~0.8V 600V AC Open circuit voltage is about

1.5V

Model 72-10395 Operating Manual

Buzzer

Continuity

0.1Ω About≤60Ω 600V AC

Continuity resistance

≤60Ω: buzzer beeps;

＞60Ω: not necessarily to

beep, and displays

approximate resistance value

with unit“Ω”

Low

Voltage

Indication

About＜

2.4V icon appears

V. Operations

Check if the LCD screen displays icon to indicate the battery is low after turning on the

meter. If it does, to ensure measuring accuracy, please replace the battery. You should also

take notice of notes beside icon. They can remind you of not measuring the voltage

higher than the limit before measurement.

1. DC voltagemeasurement (See Figure 2)

(1) Turn the knob to DCV stall, AUTO and DC icons appear on LCD;

(2) Connect the black test probe to the cathode of the power to be measured and the red

test probe to the anode of the power to be measured;

(3) Read measuring results displayed on LCD;

(4) Reverse test probes in measurement, then LCD will display negative readings.

Figure 2 Figure 3

2. AC voltagemeasurement(See Figure 3)

(1) Turn the knob to ACV stall, Auto and AC icons appear on LCD;

(2) Connect the black test probe to the cathode of the power to be measured and the red

test probe to the anode of the power to be measured;

(3) Read measuring values displayed on LCD;

(4) Reverse test probes in measurement, then LCD will display negative readings.

Warnings:

Do not input voltage above 600V, you may get desired values, however, it may risk

ofdamaging the internal wiring.

To avoid electric shock, please use it with extreme caution when measuring high

Model 72-10395 Operating Manual

voltages.

Disconnect test probes from the measured circuit after finishingmeasurement.

3. Resistancemeasurement (See Figure 4)

(1) Turn the knob tostall;

(2) Connect test probes in parallel to the resistance to be

measured;

(3) Read measured results on the display.

Notes:

To avoid meter damage, when measuring the

resistance in line, please make sure the measured

circuit power is turned off; meanwhile all capacitance

has been discharged before measurement.

As for 400Ω resistance measurement, test probes will cause 0.1Ω~0.3Ω measuring

deviation. In order to get accurate readings, the ultimate results should subtract the

short circuit reading values of the red and black test probes. It is suggested to

performthe operation in relative value measurement mode.

The meter displays“OL” when no signal is input, for instance, in open circuit condition.

For measurement≥1MΩ, it normally takes several seconds to get stable readings.

4. Frequency and duty cyclemeasurement(See Figure 5)

(1) Turn the knob to Hz/%, DCV or ACV stall;

(2) Press Hz/% button to access frequency measurement;

(3) Connect test probes in parallel to frequency signal

source to be measured;

(4) Read measured results on the display;

(5) Press Hz/% button again to access % measurement.

Notes:

The measured resolution based on frequency and

waveform will vary slightly. The meter resolution has

been set according to sine wave.

5. Diode and continuitymeasurement(See dotted part in Figure 6)

(1) Turn the knob to stall;

(2) Press SELECT button to access diode mode(press it

again to switch to continuity test);

(3) If connect test probes to the diode to be

measured(with black test probe to cathode and red

test probe to anode), then the reading on LCD will be

an approximate value of diode forward voltage

drop(when connecting test probes to both ends of the

circuit to be measured, if the resistance between these

two ends is≤60Ω, the built-in buzzer will go off and the

resistance value appears on LCD).

Notes:

If the measured diode is under open circuit status or the

Model 72-10395 Operating Manual

polarity is wrongly connected (namely, with black test

probe connecting to anode and red test probe to cathode),

LCD will display“OL”.

Turn the knob to this diode stall, the meter can measure the voltage drop of PN joint of

diode and other semiconductors. For a silicon semiconductor with normal structure, the

reading of the forward voltage drop should be within 0.5~0.8V.

To avoid meter damage, before measuring the resistance in line, please make sure the

measured circuit power is turned off, and all capacitance has been discharged.

In order to avoid meter damage or injuries, do not inputvoltage above 60V DC or 30Vrms

AC.

6. Capacitancemeasurement (See Figure 7)

(1) Turn the knob to stall;

(2) As there is a capacitance reading displayed under open-circuit status, please select

relative value measuring mode;

(3) Press REL button once;

(4) Connect test probes to the capacitance to be measured,

and read data on LCD.

Notes:

Fully discharge capacitance before measurement.

As for in-line capacitance measurement, it is required

to turnoff all power supplies in the measured circuit

and fully discharge all capacitors.

If the capacitance being measured has polarity, ensure

that the red probe is connected to the anode of

capacitance and the black one to the cathode of

capacitance during measurement.

It normally takes several seconds to display the testing value when measuring

capacitance higher than 10uF.

To avoid meter damage or injuries, do not input voltage above 60V DC or 30Vrms AC.

VI.Battery Replacement

If icon appears on LCD, please replace the battery as follows:

1. Disconnect test probes from circuits being measured, turnrotary knob to OFF position,

then turn off the meter.

2. Unscrew the back casewith a screwdriver and remove the case.

3. Replace the 3V battery with a new one.

Model 72-10395 Operating Manual

Tenma Test Equipment

405 S. Pioneer Blvd.

Springboro, Oh

www.tenma.com

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