Innova 3306A User Manual

DIGITAL MULTIMETER

MRP #93-1075

SAFETY PRECAUTIONS

To prevent electrical shock and/or damage to the tester or the equipment under
test, observe the following safety precautions:

Always inspect the multimeter, test leads and any other accessories for

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damage prior to every use. If any damage is found, do not use tester until
repairs are done.

Always consider electrical and electronic equipment to be energized (live).

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Never assume any equipment is de-energized.

Never ground yourself when taking electrical measurements. Isolate

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yourself from ground by using dry rubber insulating mats to cover all
exposed/grounded metal. Stand on rubber mats and wear dry clothing.

Never take resistance measurements on energized (live) electrical or

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electronic equipment.

Use one hand, instead of two, whenever possible to take measurements. If

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two hands must be used, use extreme caution not to contact any energized
conductors with your hands. Be certain test leads are dry and clean.

Do not hold the instrument when taking measurements. Place the

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instrument on a clean, insulating surface prior to taking any measurement.

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Don't become part of the circuit. Think safety. Act safely.

If working on a vehicle, take the following added precautions

Only work on vehicle in a well ventilated area.

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Always wear safety eye protection.

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Avoid moving fan blades or any potentially moving parts.

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Avoid hot engine parts.

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Put transmission in "park" (automatic transmission vehicles) or "neutral"

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(manual transmission vehicles). Set the parking brake.

Turn the ignition "off" before connecting or disconnecting any testing

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equipment.

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Put blocks on drive wheels.

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Avoid wearing loose clothing or jewelry when working on a vehicle.

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Read your vehicle's service manual and follow it's safety procedures.

DC VOLTS

Range Resolution Accuracy

Overload
Protection

200mV

2V

20V

0V

20

600V

Input impedance: 10MΩ for all ranges.

0.1mV

1mV

10mV

100mV

1V

±(0.8% of reading + 5 digits)

600V DC or AC

RESISTANCE (OHMS)

Range Resolution Accuracy Overload

Protection

200Ω

2KΩ

20KΩ

200KΩ

2M Ω

20M Ω

Open Circuit Voltage: Approximately 0.3V

100mΩ

1Ω

10Ω

100Ω

1KΩ

10KΩ

±(1% of reading + 5 digits)

±(2% of reading + 5 digits)

250V DC/AC RMS

DIODE/CONTINUITY TEST

Function Range Resolution

Diode test

Continuity test

2V

200Ω

Description Note

1mV

0.1Ω

Test current 1±0.6mA
Test Voltage: Approx.: 1.5V

Approx.120Ω or less,

buzzer (beeper) will sound

Overload Protection:
250V DC or AC RMS

AC VOLTS

Range Resolution Accuracy Overload

Protection

2V

20V

200V

600V

Frequency: 40~400Hz Input impedance: 10MΩ for all ranges.

1mV

10mV

100mV

1V

±(1.2% of reading + 5 digits)

600V DC or AC600 RMS

600V R

MS

FEATURES/SPECIFICATIONS

• 1.50 X 0.50 in. LCD display

• Auto range control

• Automatic negative (-) polarity indication

• Automatic zero adjustment

• Over range indicator. Displays "OL" on LCD

• Low battery indicator. Displays battery symbol on LCD

• Safety standard: CE EMC/LVD. The meter is up to the standards of

IEC1010 Pollution Degree 2, over voltage Category 3.

• is protected throughout by Double or Reinforced Equipment marked
Insulation.

• Operating environment:
Temperature - 32° to 104° F. (0° C to 40° C)

Humidity - Less than 80% relative humidity (non-condensing)
Altitude - up to 6562 ft (2000 meters)

• Storage environment:
Temperature - 4° to 140° F (- 20° to 60° C)

Humidity - Less than 90% relative humidity (non-condensing)

• Power Supply: Two 1.5-volt (LR44) batteries

• Dimensions:
Height - 5.0 in. (127 mm)

Width - 3.50 in. (89 mm)
Depth - 0.5 in. (12.7 mm)

• Weight (including batteries): approximately 3.5 oz (99 g)

ELECTRICAL SPECIFICATIONS

Accuracy of specifications in the following tables are based on an operating
temperature of 73°F ± 5°F(23°C ± 5°C) and a relative humidity of less than
75% RH.

Maximum voltage between RED and BLACK
from BLACK test lead to ground is 300V AC/DC.

test leads is 600V AC/DC;

BATTERY REPLACEMENT

WARNING

When replacing the batteries, remove only the rear panel. Do not
remove or disassemble the circuit board or the front panel, these
items are not serviceable and if disassembled there is the possibility
of loose metal parts shorting the circuit board and causing an
electrocution danger to the user.

1. Turn the Digital Multimeter “OFF”.

2. Remove the screws on the back of the meter and separate the case.

3. Replace the batteries:

• Remove the batteries from the battery compartment and replace

only with two 1.5-volt (LR44) batteries.

4. Reassemble the case and secure with the screws.

PREPARATION AND CAUTION BEFORE USE

 Inspect the digital multimeter for damage to the case. Do not use if

cracked, distorted, excessively dirty or any abnormal condition exists.

 Inspect the test leads for damage. Check for cracked insulation, broken or

damaged probes, loose or bent probe pins. Do not use if any abnormal
condition exists.

 Set the Function/Range Selector Switch to the proper range BEFORE

taking measurements. If the range/function must be switched during a test,
ALWAYS remove the test leads from the circuit being measured before
switching settings.

 To avoid possible electric shock, instrument damage, and/or equipment

damage when taking voltage or current measurements, DO NOT exceed
the maximum value of the selected range.

 If the unit is used near high noise Radio Frequency (RF) generating

equipment (spark plug wires, ignition coils or alternator), the display may
become unstable or indicate large errors. If you obtain erratic readings during
use, isolate the Multimeter as far away as possible from these components.

TESTING PROCEDURES

NOTE: Designed to meet CATIII 300V when the protective cap is attached to
the test leads and meet CATII600V when the cap is not attached to the test
lead.
Use of our protective cap offers different lengths suitable for the test
environments.

A. AC/DC VOLTAGE MEASUREMENT

WARNING

To avoid possible electric shock, instrument damage and/or
equipment damage, DO NOT attempt to measure voltages ABOVE

600V AC/DC
600V AC/DC between the RED and BLACK test leads is the

maximum voltage that this instrument is designed to measure. The
BLACK test lead potential should not exceed 300V AC/DC measured
to ground. Please make sure the protective cap attached before AC/

DC voltage measurement.

1. Set the meter’s Function Selector Switch to the appropriate ACV or

DCV position.

Place the RED test lead onto the positive (+) side of the item being

2.

tested and the BLACK test lead onto the negative (-) (across the
source/load) side of the item. BE CAREFUL not to touch any
energized conductors with any part of your body.

Read the results on the display.

3.

B. RESISTANCE MEASUREMENT Ω (OHMS)

Resistance measurements must be made on “de-energized” (dead)
circuits ONLY. Impressing a voltage across the multimeter’s terminals
while set to any resistance range may result in electric shock,
instrument damage and/or damage to equipment under test. MAKE
SURE equipment is completely de-energized before taking any
resistance measurements.

1. Set the meter’s Function Selector Switch to the OHM "Ω" range

function.

Place the RED test lead onto one side of the item being tested and the

2.
BLACK test lead onto the other side of the item. (Polarity does not
matter when checking resistance).

3.

Read the results on the display.

C. CONTINUITY TEST

Set the Function Selector Switch to the position

1.

Place the RED test lead to one end of the wire or device being

2.

tested for continuity and the BLACK test lead to the opposite end.

Listen to the sound of the beeper and confirm the results by

3.

reading the
Note:The beeper will sound only if the continuity of the item under
test (resistance between the two test leads) measures less than 120 ohms.

or take measurements if the voltage is unknown.

WARNING

display.

MAINTENANCE

1. No periodic maintenance is required other than the replacement of the
batteries and visual inspection of the meter.

2. Keep the meter clean and dry. DO NOT use solvent to clean, use a
damp (not wet) cloth and fully dry after cleaning.

LIMITED ONE YEAR WARRANTY

The Manufacturer warrants to the original purchaser that this unit is free of
defects in materials and workmanship under normal use and maintenance for a
period of one (1) year from the date of original purchase.

If the unit fails within the one (1) year period, it will be repaired or replaced, at
the Manufacturer’s option, at no charge, when returned prepaid to the Service
Center with Proof of Purchase. The sales receipt may be used for this purpose.
Installation labor is not covered under this warranty. All replacement parts,
whether new or remanufactured, assume as their warranty period only the
remaining time of this warranty.

This warranty does not apply to damage caused by improper use, accident,
abuse, improper voltage, service, fire, flood, lightning, or other acts of God, or if
the product was altered or repaired by anyone other than the Manufacturer’s
Service Center.

The Manufacturer, under no circumstances shall be liable for any
consequential damages for breach of any written warranty of this unit. This
warranty gives you specific legal rights, and you may also have rights, which
vary from state to state. This manual is copyrighted with all rights reserved. No
portion of this document may be copied or reproduced by any means without
the express written permission of the Manufacturer. THIS WARRANTY IS NOT
TRANSFERABLE. For service, send via U.P.S. (if possible) prepaid to
Manufacturer. Allow 3-4 weeks for service/repair.

SERVICE PROCEDURES

If you have any questions, require technical support or information on
UPDATES and OPTIONAL ACCESSORIES, please contact your local store,
distributor or the Service Center.

USA & Canada: [phone] (6:00 AM-6:00 PM, Monday-Saturday PST)
All others: [phone] (6
FAX: [phone] (24 hr.)
Web: www.innova.com

Innova Electronics Corp.

17352 Von Karman Ave.
Irvine, CA 92614

:00 AM-6:00 PM, Monday-Saturday PST)

D. DIODE TEST

NOTE: A diode is a semiconductor device that lets current flow in one
direction only. If the diode to be tested is part of a circuit (with other
electronic components), you must isolate it from the other components by
disconnecting at least one side
diode will show a low voltage drop across its junction (0.5-0.8 volts for a
silicon diode or about 0.3V for a germanium diode) when the leads are
connected in one polarity and a very high resistance (or open circuit) when the
leads are reversed (connected in the opposite polarity).

1.

CAUTION: To avoid personal injury and/or damage to the multi­meter, MAKE SURE power is removed from the circuit before
performing Diode Test.

Place the RED test lead onto one side of the diode being tested and the

2.

BLACK test lead onto the other side.
Read the value on the display.

3.

Reverse the test leads and again read the value on the display. Compare the

4.

two values. One value should be higher than the other. See note above.

of it from the circuit before testing. A good

position Set the Function Selector Switch to

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