Tenma 72-7228 User manual

72-7228
P/N: 110401100913
Digital Clamp Multimeter

Model 72-7228
OPERATING MANUAL

Table of Contents
Title Page
Model 72-7228: OPERATING MANUAL
Overview
Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Functional Buttons
The Effectiveness of Functional Buttons
Display Symbols
Measurement Operation
A. DC/AC Voltage Measurement
B. Measuring Resistance
C. Testing Diodes
D. Testing for Continuity
E. Frequency Measurement
F. Duty Cycle Measurement
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Title Page
Model 72-7228: OPERATING MANUAL
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G. DC Current Measurement
H. AC Current Measurement
Sleep Mode
Specifications
A. General Specifications
B. Environmental Requirements
Accuracy Specifications
A. DC Voltage
B. AC Voltage
C. Resistance
D. Diode Test
E. Continuity Test
F. Frequency
G. Duty Cycle
H. DC Current
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Model 72-7228: OPERATING MANUAL
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I. AC Current
Maintenance
A. General Service
B. Replacing the Battery
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Model 72-7228: OPERATING MANUAL
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.
Digital Clamp Multimeter Model 72-7228 (hereafter referred to as “the Meter”) features
3 5/6 digits and a 6666 count display. It uses large scale integrated circuit with double
integrated A/D converter as its core and has full range overload protection.
The Meter will measure AC/DC voltage, AC/DC current, frequency, duty cycle,
resistance, diodes, continuity and surge current.
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Item Description Qty
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Operating manual
Test Lead
Carry case
9V Battery (NEDA1604A or 6LF22)
1 piece
1 pair
1 piece
1 piece
Model 72-7228: OPERATING MANUAL
Inspection
Open the package case and take out the Meter. Carefully check the following items
for missing or damaged parts:
In the event items are missing or damaged, contact your dealer immediately.
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Model 72-7228: OPERATING MANUAL
Safety Information
This Meter complies with the standards IEC61010-1; IEC61010-2-032: in pollution
degree 2, overvoltage category (CAT. II 600V, CAT. III 300V) and double insulation.
CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient
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 10. 6

Model 72-7228: OPERATING MANUAL
Rules For Safe Operation
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:
Warning
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 that the rated voltage, as marked on the Meter , between
the terminals or between any terminal and ground. 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.
When measurement has been completed, disconnect the connection between
the test leads and the circuit under test, remove the testing leads from
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Model 72-7228: OPERATING MANUAL
the input terminals of the Meter and turn the Meter power off.
Ensure the rotary switch is in the correct position prior to measurement.
To prevent damage to the meter, range or mode changes should not be
made during measurement.
Do not perform measurements when the Meter’s back case and battery
compartment are not closed to avoid electric shock.
Do not input higher than 600V between the two Meter’s input terminal to
avoid electric shock and damage to the meter, do not input higher than
600V between the Meter’s two input terminals.
When working with effective voltages over 70VDC or 33VAC RMS,
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, inflammable 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.
To avoid electric shock, do not touch the bare wires, connectors, unused
input terminals or the circuit under testing during measurement.
Disconnect circuit power and discharge all high-voltage capacitors before
testing resistance, continuity and diode.
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