TENMA 72-7720, 72-7725 operating Manual

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	Model 72-7720/72-7725: OPERATING MANUAL
Table of Contents
Title		Page
Overview		3
Unpacking Inspection		4
Safety Information		5
Rules For Safe Operation		6
International Electrical Symbols		8
The Multimeter Structure		9
Functional Buttons		10
Display Symbols		11
Measurement Operation		13
A.	DC Voltage Measurement	13
B.	AC Voltage Measurement	14
C.	DC Current Measurement	16
D.	AC Current Measurement	17
E.	Measuring Resistance	19

F.Model 72-7725:

Frequency Measurement

G.Model 72-7725:

	Temperature Measurement	21
H.	Capacitance Measurement	22
I.	Measuring Diodes & Continuity	23
Testing for Continuity		24
Sleep Mode		25
Turning on the Auto Display Backlight		25
General Specifications		26
Accuracy Specifications		27
A.	DC Voltage	27
B.	AC Voltage	27
C.	DC Current	28
D.	AC Current	28

Model 72-7720/72-7725: OPERATING MANUAL

Title		Page
E.	Resistance Test	29
F.	Model 72-7725: Frequency	29

G.Model 72-7725:

	Temperature	29
H.	Capacitance	30
I.	Diodes and Continuity Test	30
Maintenance		31
A.	General Service	32
B.	Replacing the Battery	32
C.	Replacing the Fuses	32

Model 72-7720/72-7725: OPERATING MANUAL

Overview

Warning

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

Digital Multimeters Model 72-720 and 72-7725 (hereafter referred to as “the Meter”) are 3 1/2 digits with steady operations, fashionable structure and highly reliable hand-held measuring instrument. The Meter uses large scale of integrated circuit with double integrated A/D converter as its core and has full range overload protection. The Meter not only can measure AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Temperature, Frequency, Diodes and Continuity, but also has Data Hold, Full Icon Display and Sleep Mode features.

The Meter adopted advanced “co-injection” technique in order to provide sufficient insulation and anti-shaking. In addition, the Automatic Display Backlight feature enables user to work in a dim condition.

Model 72-7720/72-7725: OPERATING MANUAL

Unpacking Inspection

Open the package case and take out the Meter. Check the following items carefully for missing or damaged parts:

Item	Description	Qty
1	English Operating Manual	1 piece
2	Test Lead	1 pair
3	Test Clip	1 pair
4	Point Contact Temperature Probe	1 piece
	(72-7725 only)

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

Model 72-7720/72-7725: OPERATING MANUAL

Safety Information

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

CAT. 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.

Model 72-7720/72-7725: OPERATING MANUAL

Rules For Safe Operation (1)

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:

•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.

•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.

•Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and ground.

•The rotary switch should be placed in the correct position and no changeover of range shall be made during measurement, to prevent damage of the Meter.

•When working at an effective voltage over 60V DC or 30V rms AC, special care should be taken for there is danger of electric shock.

•Use the proper terminals, function, and range for your measurements.

•Do not use or store the Meter in an environment of high temperature, humidity, explosive, flammable and strong magnetic field. The performance of the Meter may deteriorate after dampened.

•When using the test leads, keep your fingers behind the finger guards.

Model 72-7720/72-7725: OPERATING MANUAL

Rules For Safe Operation (2)

•Disconnect circuit power and discharge all highvoltage capacitors before testing resistance, continuity, diodes, capacitance or current.

•Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter .

•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.

•Remove test leads, test clips and temperature probe from the Meter and turn the Meter power off before opening the Meter case.

•When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.

•The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident.

•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.

•The Meter is suitable only for indoor use.

•Turn the Meter power off when it is not in use and take out the battery when not using for a long time.

•Periodically check the battery as it may leak after some time.If leakage is apparent,the battery should be immediately replaced to prevent damage.