Tenma 72-9375 Operating Manual

110V

P/N:110401102691

72-9375

1

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………………………………….

23

B. Replacing the Fuses…………………………….24

72-9375: OPERATING MANUAL

2

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

ty

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

72-9375: OPERATING MANUAL

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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

72-9375: OPERATING MANUAL

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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

72-9375: OPERATING MANUAL

5

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

ȍ

: Capacitance test

Hz Frequency Test.

μA , mA ,

A

AC or DC Current Measurement

CHARGE 110V MAX:

72-9375: OPERATING MANUAL

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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

n

Measurin

g

Function

Operation Performed

RESE

T

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

CT

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)

72-9375: OPERATING MANUAL

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7

No. Symbol Meaning

AC Indicator for AC voltage or

current.
The displayed value is the mean
value.

Indicates negative reading.

CHARG

E

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.

V

Unit voltage (when charging is

on)

Continuity buzzer
Test of diode

1

2

3

4

5

6

7

8

9

10

,k ,

M

:

:

k

M :

Ohm (unit of resistance)
Kilohm (1 x 10

3

or 1000
ohms)
Megohm (1 x 10

6

or

1,000,000 ohms)

72-9375: OPERATING MANUAL