TENMA 72-7935 User Manual

Model 72-7935: OPERATING MANUAL

Table of Contents (1)

Table of Contents Title Page

Overview Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Functional Buttons Measurement Operation A. DC Voltage Measurement B. AC Voltage Measurement C. Measuring Resistance D. Frequency and Duty Cycle Measurement E. Measuring Diodes & Continuity F. Capacitance Measurement

3 4 5 6 9 10 11 12 13 15 16 19 20 23

Model 72-7935: OPERATING MANUAL

Table of Contents (2)

Title Page

Sleep Mode General Specifications Accuracy Specifications A. DC Voltage B. AC Voltage C. Resistance Test D. Frequency E. Duty Cycle F. Diodes and Continuity Test G. Capacitance Maintenance A. General Service B. Replacing the Battery

25 26 27 28 29 30 31 32 32 33 34 35 36

Model 72-7935: OPERATING MANUAL

Overview

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

The Digital Multimeter Model 72-7935 (hereafter referred to as the meter) is a highly reliable handheld measuring instrument featuring a variety of functions in a compact design. Features include a 3-3/4 digit LCD display and dual A/D converters and will measure AC/DC voltage, resistance, capacitance, frequency, duty cycle, diode and continuity. Additional capabilities include relative mode, data hold, full icon display and sleep mode.

Model 72-7935: OPERATING MANUAL

Unpacking Inspection

Inspection

This meter includes the following items:

Item

1 2 3 4

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

Description

English Operating Manual Built-In Test Lead Vinyl Holder 3V Button Battery (CR2032)

Qty

1 piece

1 pair 1 piece 1 piece

Model 72-7935: OPERATING MANUAL

Safety Information

This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. II 300V) and double insulation.

CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient voltage overvoltages than CAT. III

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

explained on page 9.

Model 72-7935: OPERATING MANUAL

Rules For Safe Operation (1)

Rules For Safe Operation

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.

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

The rotary switch should be placed in the desired position prior to connecting leads. This position should not be changed while leads are connected.

Model 72-7935: OPERATING MANUAL

Rules For Safe Operation (2)

When using the Meter at an effective voltage over 60V DC 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, 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.

Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes or capacitance.

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 the connection between the testing leads and the circuit being tested, and turn the Meter power off before opening the Meter case.

Model 72-7935: OPERATING MANUAL

Rules For Safe Operation (3)

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 for indoor use only.

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 for leaks, a leaking battery will damage the meter.

Model 72-7935: OPERATING MANUAL

International Electrical Symbols

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

Model 72-7935: OPERATING MANUAL

The Meter Structure

The Meter Structure (see figure 1)

1. LCD Display

2. SELECT Button

3. RELATIVE Mode Button

4. DATA HOLD Button

5. Hz/DUTY Button

6. Rotary Switch

7. Black Test Lead

8. Red Test Lead

3 4

5 6

( figure 1)

Model 72-7935: OPERATING MANUAL

Functional Buttons

Button Operation Performed SELECT

RELATIVE

DATA HOLD

Hz/DUTY

Press SELECT to switch between resistance, capacitance, continuity buzzer and diode measurement modes; the Meter beeps. Resistance measurement is default.

Press RELATIVE to enter and exit the REL mode in any measuring mode except in frequency/duty cycle; the Meter beeps.

Press HOLD once to enter hold mode.

Press HOLD again to exit hold mode.

In Hold mode, is displayed and the present value is shown. Press Hz/DUTY at DCV to step through DCV, frequency and duty cycle

measurement mode. on the LCD will disappear.

Press Hz/DUTY at ACV to step through ACV, frequency and duty cycle measurement mode. on the LCD will disappear.

The Meter will be at DCV: 400mV or ACV : 4V after stepping through frequency and duty cycle measurement mode. Therefore it is necessary to turn the rotary switch or turn off and on the Meter to resume to autoranging mode when measuring higher voltage.

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