Tenma 72-9375 Operating Manual

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110V

P/N:110401102691

72-9375

Page 2

Table of Contents

Title Page

Overview…………………………………………………2 Package Contents………………………………………2 Safety Information………………………………………2 Rules for Safe Operation………………………………3 International Electrical Symbols……………………….4 The Meter Structure…………………………………….5 Rotary Switch……………………………………………5

Functional Buttons………………………………..........6

Display Symbols…………………………………..........6

Measurement Operation……………………………....8

A. AC & DC Voltage Measurement……………….8 B. Measuring Resistance, Diodes, Continuity &

Capacitance……………………………………..10 C. Frequency Measurement………………………14 D. AC & DC Current Measurement………………15 E. Power Charging…………………………………16 Operation of Hold Mode……………………………….17 The Use of Relative Value Mode……………………..18 The RESET Button…………………………………….19 The SELECT Button…………………………………...19 Sleep Mode……………………………………………..19

General Specifications………………………………....19

Accuracy Specifications……………………………….20 A. AC Voltage………………………………………20 B. DC Voltage………………………………………21 C. Resistance………………………………………21 D. Diode & Continuity…………………………….. 21 E. Capacitance Test……………………………….22 F. Frequency Test………………………………….22 G. AC Current………………………………………22 H. DC Current………………………………………23 Maintenance…………………………………………….23 A. General Service………………………………….

B. Replacing the Fuses…………………………….24

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Overview

This Operating Manual covers information on safety and cautions. Please read the relevant information carefully and observe all the Warnings and Notes strictly.

Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully before using the Meter.

The Tenma 72-9375 (hereafter referred to as “the Meter”) is a 4000 counts, 3 3/4 digits solar powered auto ranging electrical tester with stabilized functions, safe design, and reliable performance. In addition to the conventional measuring function, such as DC/AC voltage, DC/AC current, resistance, diode, data hold and continuity, it is equipped with capacitance test, frequency test, relative mode and this meter is equipped with the flexibility of charging through 110V AC or 12-36 AC/DC or built-in solar energy cell. With this design, the Meter does not require a conventional battery, which reduces waste and cost associated with disposable batteries.

PACKAGE CONTENTS

Open the package case and take out the Meter. Check the following items carefully to see any missing or damaged part:

tem Description

1 English Operating Manual 1 piece

Test Lead 1 pair

Holster 1 piece

In the event you find any missing items or damage to the included items, please contact your dealer immediately.

Safety Information

This Meter complies with standards IEC61010: in pollution degree 2, overvoltage category (CAT. II

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1000V, CAT. III 600V) and double insulation. Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired. In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter or the equipment under test. A Note identifies the information that user should pay

attention on.

Rules For Safe Operation(1)

Warning To avoid possible electric shock or personal injury, and to avoid damage to the Meter or to the equipment under test, adhere to the following rules: z Before using the Meter inspect the case. Do

not use the Meter if it is damaged or the case (or part of the case) is removed. Look for cracks or missing plastic. Inspect the insulation around the connectors.

z Inspect the test leads for damaged insulation

or exposed metal. Check the test leads for continuity. Replace damaged test leads with identical model number or electrical specifications before using the Meter.

z When using the test leads, keep your fingers

behind the finger guards.

z Do not apply more than the rated voltage, as

marked on the Meter, between the terminals or between any terminal and grounding.

z When the Meter working at an effective

voltage over 60V in DC or 30V in AC, special care should be taken from there is danger of electric shock.

z Use the proper terminals, function, and range

for your measurements.

z The rotary switch should be placed in the

right position and no any changeover of

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range shall be made during measurement is conducted to prevent damage of the Meter.

z Disconnect circuit power and discharge all

high-voltage capacitors before testing current, resistance, diodes, continuity or capacitance.

z Start charging as soon as the power indicator

appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury.

z When servicing the Meter, use only the same

model number or identical electrical specifications replacement parts.

z The internal circuit of the Meter shall not be

altered at will to avoid damage of the Meter and any accident.

z Soft cloth and mild detergent should be used

to clean the surface of the Meter when servicing. No abrasives or solvents should be used on or in the meter.

z Turn the Meter off when it is not in use z Do not use or store the Meter in an

environment of high temperature, humidity, explosive, inflammable and strong magnetic field; the performance of the Meter may deteriorate.

International Electrical Symbols

AC(Alternating

Current)

Low Battery

DC (Direct Current) Continuity

Test

AC or DC

Diode

Grounding

Capacitance Test

Double Insulated Fuse

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Warning. Refer to the Operating Manual

Conforms to Standards of European Union

The Meter Structure (see figure 1)

ķ LCD Display ĸ Solar Panel Ĺ SELECT Button ĺ Rotary Switch

Ļ HOLD Button ļ Input Terminals Ľ Relative Mode & RESET Button

Rotary Switch

Below table indicated for information about the rotary switch positions.

Rotary

Switch

Position

Function

OFF Power is turned off

V AC/DC voltage measurement

ȍ: Resistance measurement

: Diode Test.

: Continuity test

: Capacitance test

Hz Frequency Test.

μA , mA ,

AC or DC Current Measurement

CHARGE 110V MAX:

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Charge at 110VAC. 12-36

: Charge at 12-36 .

Functional Buttons

Below table indicated for information about the functional button operations.

Butto

Measurin

Function

Operation Performed

RESE

Any rotary

switch

position

except Hz

and

CHARGE

Press

RESET to

enter and exit the mode in any measuring mode except in frequency and charge mode (Meter will beep)

V A

Switches between AC and DC voltage/current (DC is default)

SELE

Switches between resistance, diode, continuity and capacitance measurements (Resistance is default)

Any rotary

switch

position

Press to enter and exit the Hold mode in any mode

Display Symbols (see figure 2)

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No. Symbol Meaning

AC Indicator for AC voltage or

current. The displayed value is the mean value.

Indicates negative reading.

CHARG

Charge indicator

AUTO

The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution.

Data hold is active

The mode displays the present value minus the stored value

The power is low.

Warning: To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears.

Unit voltage (when charging is

on)

Continuity buzzer Test of diode

,k ,

M :

Ohm (unit of resistance) Kilohm (1 x 10

or 1000 ohms) Megohm (1 x 10

1,000,000 ohms)

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Measurement Operation

µF, nF F:

µF:

nF:

Farad (unit of capacitance) Microfarad. 1 x 10

-6

0.000001 farads. Nanofarad. 1 x 10

-9

0.000000001 farads.

Hz, kHz,

MHz

Hz:

kHz:

MHz:

Hertz (The unit of frequency in cycles/second. Kilohertz. 1 x 10

or 1,000 hertz. Megahertz. 1 x 10

or1,000,000 hertz.

V, mV V:

mV:

Volts (unit of voltage) Millivolt (1 x 10

-3

or 0.001

volts)

A, mA,

µA

mA:

µA:

Amperes (amps). The unit of current. Milliamp. 1 x 10

-3

or 0.001 amperes. Microamp. 1 x 10

-6

0.000001 amperes.

A. AC & DC Voltage Measurement (see figure 3)

Warning To avoid personal injury or damages to the Meter from electric shock, please do not attempt to measure voltages higher than 1000VDC / 750VAC RMS although readings may be obtained.

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AC voltage measurement

The AC voltage ranges are: 4.000V, 40.00V, 400.0V and 750.0V. To measure AC Voltage, connect the Meter as follows:

1. Insert the red test lead into the HzVȍ terminal

and the black test lead into the COM terminal.

2. Set the rotary switch to V

and press SELECT

button to select AC measurement mode.

3. Connect the test leads with the object being

measured.

The measured value shows on the displayˈwhich is effective value of sine wave (mean value

response).

Note

z At 400mV range, the Meter has an input

impedance of 4000Mȍ. All other ranges the Meter has an input impedance of 10Mȍ. This loading effect can cause measurement errors in high impedance circuits. If the circuit impedance is less than or equal to 10kȍ, the error is negligible (0.1% or less).

z When AC voltage measurement has been

completed, disconnect the connection between the test leads and the circuit under test.

DC voltage measurement

The DC Voltage ranges are: 400.0mV, 4.000V, 40.00V,

400.0V and 1000V. To measure DC voltage, connect the Meter as follows:

1. Insert the red test lead into the HzVȍ terminal and the black test lead into the COM terminal.

2. Set the rotary switch to V

; DC measurement is

default or press SELECT button to select DC measurement mode.

3. Connect the test leads across with the object being measured. The measured value shows on the display.

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Note

At 400mV range, the Meter has an input

impedance of 4000M . Except at 400mV range, all other ranges 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).

When DC voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test.

B. Measuring Resistance, Diodes, Continuity &

Capacitance

Warning

To avoid personal injury, never attempt to input over 60V in DC or 30V rms in AC.

To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance, diodes, continuity & capacitance

For testing capacitance, use the DC Voltage function to confirm that the capacitor is discharged.

Resistance Measurement (see figure 4)

The resistance ranges are: 400.0 , 4.000k , 40.00k ,

400.0k

, 4.000M and 40.00M . To measure

resistance, connect the Meter as follows:

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1. Insert the red test lead into the HzVȍterminal and the black test lead into the COM terminal.

2. Set the rotary switch toȍ

, resistance

measurement (ȍ) is default (or press SELECT button to selectȍmeasurement mode)

3. Connect the test leads with the object being measured.

The measured value shows on the display.

Note

z The test leads can add 0.1ȍto 0.2ȍ of error to

resistance measurement. To obtain precision readings in low-resistance measurement, that is the range of 400.0ȍ, short-circuit the input terminals beforehand, using the relative value

function button

RESET to automatically

subtract the value measured when the testing leads are short-circuited from the reading.

z For high-resistance measurement (>1Mȍ), it is

normal taking several seconds to obtain a stable reading.

z If ȍ reading with shorted test leads is not 0.5ȍ,

check for loose test leads, incorrect function selection, or enabled Data Hold function.

z The LCD displays OL indicating open-circuit for

the tested resistor or the resistor value is higher than the maximum range of the Meter.

z When resistance measurement has been

completed, disconnect the connection between the test leads and the circuit under test.

Testing Diodes (see figure 5)

Use the diode test to check diodes, transistors, and

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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:

1. Insert the red test lead into the HzVȍterminal and

the black test lead into the COM terminal.

2. Set the rotary switch toȍ

and press

SELECT button to select

measurement

mode.

3. 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

z In a circuit, a good diode should still produce a

forward voltage drop reading of 0.5V to 0.8V; however, the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips.

z Connect the test leads to the proper terminals as

listed above. The LCD will display OL indicating open-circuit for wrong connection. The unit of diode is Volt (V), displaying the positive-connection voltage-drop value.

z When diode testing has been completed,

disconnect the connection between the testing leads and the circuit under test.

Continuity Testing (see figure 6)

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To test for continuity, connect the Meter as below:

1. Insert the red test lead into the HzV

terminal and

the black test lead into the COM terminal.

2. Set the rotary switch to

and press

SELECT button to select

measurement

mode.

3. The buzzer does not sound if the circuit is

disconnected and resistance value is > 100

. The buzzer sounds continuously if the circuit is in good condition, with resistance value 10 .

4. The nearest circuit resistance value shows on the display, the unit is

Note

The LCD displays OL indicating the resistance of the circuit being tested is higher than 400 .

The buzzer sounds if the

RESET, SELECT or

is pressed. When continuity testing has been completed, disconnect the connection between the test leads and the circuit under test.

Capacitance Measurement (see figure 7)

The Meter’s capacitance ranges are: 40.00nF, 400.0nF,

4.000μF, 40.00μF, and 100.0μF. To measure capacitance, connect the Meter as follows:

1. Insert the red test lead into the HzV

terminal and

the black test lead into the COM terminal.

2. Set the rotary switch to

and press

SELECT button to select

measurement mode. The built-in equalized capacitance of the Meter will affect the reading accuracy. For better

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accuracy of capacitance measurement, press button before measuring (the LCD will display 0).

3. Connect the test leads with the object being measured.

The measured value shows on the display.

Note

The LCD displays OL indicating the capacitor is short-circuited or the capacitor value being

tested is overload. For testing the capacitor polarity, connect the red test lead to anode & black test lead to cathode instead of using test leads as mentioned above. Readings take longer when testing a capacitor value which is higher than 10μF range. When capacitance measurement has been completed, disconnect the connection between the testing leads and the circuit under test.

C. Frequency Measurement (see figure 8)

Warning To avoid personal injury, please do not attempt to input frequency voltage being tested higher than 30V.

The measurement ranges are from 10Hz to 10MHz. To measure frequency, connect the Meter as follows:

1. Insert the red test lead into the HzV

terminal and

the black test lead into the COM terminal.

2. Set the rotary switch to Hz.

3. Connect the test leads across with the object

being measured. The measured value shows on the display.

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Note

When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test.

D. AC & DC Current Measurement (see figure 9)

Warning Never attempt an in-circuit current measurement where the open-circuit voltage between the circuit and ground is greater than 110V. If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt. Use proper terminals, function, and range for the measurement. When the testing leads are connected to the current terminals, do not parallel them across any circuit.

The current measurement has 3 measurement positions on the rotary switch:

, A and mA .

The

has a 400.0 A and 4000 A range, with auto ranging; the mA has a 40.00mA and 400.0mA range, with auto ranging; A

position has a 4.000A and

10.00A range, with auto ranging. To measure current, do the following:

1. Turn off power to the circuit. Discharge all

high-voltage capacitors.

2. Insert the red test lead into the

AmA or 10A

terminal and the black test lead into the COM terminal.

Use the 10A terminal and A

range if the

current value to be tested is an unknown.

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3. Set the rotary switch toȝA , mA or A .

4. The Meter defaults to DC current measurement

mode. To toggle between DC and AC current measurement function, press SELECT button. AC current is displayed as an mean value (calibrated against sine wave effective value).

5. Break the current path to be tested. Connect the

red test lead to the more positive side of the break and the black test lead to the more negative side of the break.

6. Turn on power to the circuit. The measured value shows on the display.

Note

z For safety sake, the measuring time for high

current should be less than 10 seconds for each measurement and the interval time between 2 measurements should be greater than 15 minutes.

z When current measurement has been completed,

disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

E. Power Charging (see figure 10)

Warning

Start charging as soon as the power indicator appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury. To avoid damage to the Meter, please do not attempt to change the rotary switch during charging.

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To set up charging as follows:

Charge at 110V AC

1. Insert the red test lead into the HzV terminal and

the black test lead into the COM terminal.

2. Set the rotary switch to 110V

MAX.

3. Insert the test leads’ probe tip into the 110V AC

power supply respectively.

4. CHARGE shows on the display.

5. The charging time is around 15 mins.

6. Take the DC Voltage range as an example, the

continuous working time is

90 mins

Charge at 12-36V

1. Insert the red test lead into the HzV terminal and

the black test lead into the COM terminal.

2. Set the rotary switch to 12-36V

3. Place the test leads’ probe tip onto the 12-36V

power supply respectively.

4. CHARGE shows on the display.

5. The charging time is at least 30 mins.

6. The continuous working time is

90 mins

Charge by Solar Power

Automatic charging can be completed through the built-in solar cell and a steady light source (preferably sunlight).

Remarks:

The display indicates “0.7V” as the rated charge voltage (us as a comparative value) The LCD will turn off when the power is low. When the LCD turned on or charging after 5 minutes during charging, press RESET to display the correct current charging voltage. When power charging has been completed, disconnect the connection between the testing leads and the supply power.

Operation of Hold Mode

Warning To avoid possibility of electric shock, do not use Hold mode to determine if circuits are without

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power. The Hold mode will not capture unstable or noisy readings.

The Hold mode is applicable to all measurement functions.

Press

to enter Hold mode (meter will beep)

Press again to exit Hold mode (meter will

beep)

In Hold mode,

is displayed.

The Use of Relative Value Mode

The

mode applies to all measurement functions

except frequency and charge function

it subtracts a

stored value from the present value and displays the relative value (

) as the result

The definition is as follows:

Relative value (

) = present value – stored value

For instance, if the stored value is 20.0V and the

present measurement value is 22.0V, the reading would be 2.0V. If a new measurement value is equal to the stored value then display 0.0V.

To enter or exit

mode:

Use rotary switch to select the measurement

function before selecting

RESET.If

measurement functions change manually after

RESET is selected, the Meter exits the

mode.

Press

RESET to enter mode, and the

present measurement range is locked and display the last measurement value as “0” as the stored value.

Press RESET again to reset the stored value

and exit

Mode.

Turn the rotary back and forth one time to return to auto ranging mode. This only applies to those functions having auto ranging.

Pressing in any modes makes the Meter stop updating. Pressing again to resume updating.

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The RESET button

The RESET mode applies only to the charge function. The LCD will be closed when the power is low. When the LCD is first opened or charging after 5 minutes during power charging, press RESET to display the correct current charging voltage.

The SELECT button

It uses for selecting the required measurement function when there is more than one function at one position of the rotary switch.

Sleep Mode

To preserve battery life, the Meter automatically

turns off if you do not turn the rotary switch or

press any button for about 30 minutes.

The Meter can be activated by turning the rotary

switch or pressing any button

To disable the Sleep Mode, press SELECT while

turning on the Meter.

General Specifications

Maximum Voltage between any Input Terminals and ground: Refer to different range input protection voltage.

Fuse protection: 500mA, 250V, fast

AmAterminal type, 5x20mm

Fuse protection: 10A, 250V, fast

of 10A terminal type,

5x20mm Measurement Speed: Updates 3 times /second. Maximum Display: 3999 Temperature:

Operating: 0

~40 (32 ~104 ). Storage: -10 ~50 (14 ~122 ). Relative Humidity :

75% @ 0 to below 30 50% @ 31 to 40

Altitude: Operating : 2000m

Storage: 10000m Power: Charge at 110VAC/ 50Hz/0.35W or 12-36 or solar cell

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Electro-Magnetic Field Interference: When field value is under 1V/m: total accuracy = assigned accuracy + 5% of the range. When field value is over 1V/m: there is no assigned

accuracy Battery Deficiency: Display Negative reading:Display Overloading: Display: OL. Equipped with full icons display Manual / Auto ranging Polarity: Automatically display Dimensions (HxWxL): 179 x 88 x 39mm Weight: 380g (including holster and battery) Safety/Compliances:

IEC61010: CAT. II 1000V, CAT. III 600V overvoltage

and double insulation standard.

Certification:

Accuracy Specifications

Accuracy

± a% reading + b digits guarantee for 1 year Operating temperature

23 ±5

Relative humidity <75% Temperature coefficient: 0.1 x (specified accuracy) /

A. AC Voltage

Range

Resolu

tion

Accuracy

Overload Protection

4V 1mV 40V 10mV 400V 100mV

±(1%+5)

750V 1V ±(1.2%+5)

1000V DC or 750V AC continuous.

Remarks:

Input impedance: approx. 10M . Frequency response: 40Hz ~ 400Hz. Displays effective value of sine wave (mean

value response).

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B. DC Voltage

Range

Resol

ution

Accuracy

Overload Protection

400m V

0.1mV ±(0.8%+3)

4V 1 mV 40V 10 mV 400V 100mV

±(0.8%+1)

1000V 1V ±(1%+3)

1000V DC

or 750V AC

continuous

Remark:

Input impedance: At 400mV range: above 4000M All other ranges: approx. 10M

C. Resistance

Rang

Resol

ution

Accuracy

Overload Protection

400 0.1 ±(1.2%+2) 4k 1 40k 10 400k 100

±(1%+2)

4M 1k ±(1.2%+2) 40M 10k ±(1.5%+2)

600Vp

Remarks:

Open circuit voltage: approx. 0.45V

D. Diode & Continuity

Range Resolution Overload Protection

1mV

0.1

600Vp

Remarks:

Range:

Open circuit voltage approximate 1.48V.

Range:

Open circuit voltage approximate 0.45V. The buzzer does not sound when the resistance value is >100

(The circuit is disconnected or open). The buzzer sounds continuously when the

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resistance value is 10 (The closed circuit is in working condition).

E. Capacitance Test

Rang

Resoluti

Accurac

Overload Protection

40nF 10pF

±(3%+10)

400nF 100pF 4μF 1nF 40μF 10nF

±(3%+5)

100μF 100nF ±(4%+5)

600Vp

F. Frequency Test

Range

Resoluti

Accurac

Overload Protection

10Hz~ 10MH

0.01Hz~ 10kHz

±(0.1%+3

)

600Vp

Remarks:

Minimum input amplitude :

when

1MHz: 300mV

when

1MHz: 600mV

Maximum input amplitude: 30V rms

G. AC Current

Range

Overload Protection

400 A 0.1 A 4000 A1A

±(1.5%+

40mA 10 A

400mA 0.1mA

±(2%+5)

Fuse 500mA, 250V, fast type,

5×20mm

4A 1mA

10A 10mA

±(2.5%+

Fuse 10A, 250V, fast type,

5×20mm

Remarks:

Frequency response: 40Hz – 400Hz.

At 10A Range:

For continuous measurement

10 seconds (with

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15 minutes rest intervals between tests)

H. DC Current

Range

Overload Protection

400 A 0.1 A 4000 A

±(1%+2)

40mA 10 A 400mA 0.1mA

±(1.2%+

Fuse 500mA, 250V, fast type,

5×20mm

4A 1mA

10A 10mA

±(1.5%+

Fuse 10A, 250V, fast type,

5×20mm

Remarks:

At 10A range:

For continuous measurement 10 seconds (with 15 minutes rest intervals between tests)

MAINTENANCE

This section provides basic maintenance information including battery and fuse replacement instruction.

Warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information. To avoid electrical shock or damage to the Meter, do not get water inside the case. A. General Service

Periodically wipe the case with a damp cloth and

mild detergent. Do not use abrasives or solvents.

Make sure the power is off, and clean the terminals with a small brush or swab with a very small amount of contact cleaner or alcohol. Moisture or debris can create false readings.

Turn the Meter off when it is not in use and take

out the battery when not using for a long time.

Do not store the Meter in an area of high humidity,

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high temperature, explosives, and strong magnetic field.

B. Replacing the Fuses (see figure 11)

Warning To avoid electrical shock or arc blast, which would cause personal injury or damage to the Meter, use specified fuses ONLY in accordance with the following procedure.

To replace the Meter’s fuse:

1. Turn the Meter off.

2. Remove the outer holster from the Meter.

3. Remove all connections from the Meter’s

terminals.

4. Remove the 3 screws from the case bottom, and

separate the case top from the case bottom.

5. Remove the fuse by gently prying one end loose,

and remove the fuse from its bracket.

6. Install ONLY replacement fuses with the identical

type and specification as follows and make sure the fuse is fixed firmly in the bracket.

Fuse 1: 10A, 250V, fast type, ĳ5x20 mm. Fuse 2: 500mA, 250V, fast type, ĳ5x20 mm.

7. Rejoin the case bottom and case top, and

reinstall the 3 screws. Replacement of the fuses is seldom required. Blowing of a fuse almost always results from improper operation.

This operating manual is subject to change without notice.

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