Tenma 72-7930 Operating Manual

Table of Contents

Title Page

Overview
Inspection
Safety Information
Safe Operation
International Electrical Symbols
The Meter Structure
Rotary Switch Positions
Functional Button Operation
Display Symbols
Measurement Operation
A. DC and AC Voltage Measurement
B. DC and AC Current Measurement
C. Measuring Resistance
D. Measuring Diodes
E. Testing for continuity
F. Capacitance measurement
G. Temperature Measurement
H. Measuring Transistors
I. Frequency Measurement
Sleep Mode
Operation of Hold Mode
General Specifications
Accuracy Specifications
A. DC Voltage
B. AC Voltage
C. DC Current
D. AC Current
E. Resistance Test
F. Diodes Test
G. Continuity Test
H. Capacitance
I. Temperature
J. Transistor Test

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Title Page

K. Frequency
Maintenance
A. General Services
B. Replacing the Fuses
C. Replacing the Battery

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Overview

Warning
To avoid risk of injury from electric shock, read the
“Safety Information” and “Rules For Safe Operation”
carefully before using the meter.

The Digital Multimeter Model 72-7930 (hereafter referred
to as The Meter) is a highly reliable handheld measuring
instrument featuring an extra large LCD 3-1/2 digit display
and full range overload protection. It is capable of
measuring AC/DC voltage, AC/DC current, resistance,
capacitance, temperature, frequency, Transistor HFE,
diode and continuity check. It also features a full icon
display with proper test lead indication.

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Inspection

In the event items are missing or damaged, please
contact your dealer immediately.

1 Operating Manual
2 Test Leads
3 Multi-Purpose Socket
4 Point Contact Temperature Probe
5 9V Battery (NEDA 1604, 6F22 or 009P)

This meter includes the following items:

1 piece
1 pair
1 piece
1 piece
1 piece

Item

Description

Qty

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Safety Information

This Meter complies with the standards IEC61010: in
pollution degree 2, overvoltage category (CAT. II 1000V,
CAT. III 600V) and double insulation.

CA T. II: Local level, appliance, PORTABLE EQUIPMENT
etc., with smaller transient voltage overvoltages than
CAT. III
CAT. III: Distribution level, fixed installation, with smaller
transient overvoltages than CAT. IV

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 to.

International electrical symbols used on the Meter and
in this Operating Manual are explained on page 8.

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Warning
To avoid possible electric shock or personal injury,
and to avoid possible damage to the Meter or to the
equipment under test, adhere to the following rules:

l 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. Pay attention to the insulation around the
connectors.
l 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.
l Do not apply more than the rated voltage, as
marked on the Meter, between the terminals or
between any terminal and ground.
l The rotary switch should be placed in desired
position prior to connecting leads. This position
should not be changed while leads are connected.
l When using the Meter at an effective voltage
over 60V DC or 30V rms AC, special care
should be taken for there is danger of electric
shock.
l Use the proper terminals, function, and range
for your measurements.
l If the value to be measured is unknown, use the
maximum measurement position and reduce the
range step by step until a satisfactory reading is
obtained.
l 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 after dampened.

Safe Operation (1)

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Safe Operation (2)

l When using the test leads, keep your fingers
behind the finger guards.
l Disconnect circuit power and discharge all high

-voltage capacitors before testing resistance,
continuity, diodes, capacitance or current.
l Before measuring current, check the Meter’s
fuses and turn off power to the circuit before
connecting the Meter to the circuit.
l Replace the battery as soon as the battery indicator
appears. With a low battery, the Meter might
produce false readings that can lead to electric
shock and personal injury.
l Remove test leads, test clips and temperature
probe from the Meter and turn the Meter power
off before opening the Meter case.
l When servicing the Meter, use only the same
model number or identical electrical specifications
replacement parts.
l The internal circuit of the Meter shall not be altered
at will to avoid damage of the Meter and any
accident.
l Soft cloth and mild detergent should be used to
clean the surface of the Meter when servicing.
No abrasive and solvent should be used to prevent
the surface of the Meter from corrosion, damage
and accident.

l The Meter is suitable for indoor use.
l Turn the Meter power off when it is not in use

and take out the battery when not using for a long
time.
l Constantly check the battery for leaks, replace
the battery if leaks appear. A leaking battery will
damage the meter.

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International Electrical Symbols

AC (Alternating Current).
DC (Direct Current).
Ground.
Double Insulated.
Low Battery.
Warning. Refer to the Operating Manual.
Conforms to Standards of European Union.

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