INNOVA 3320 Auto-Ranging Digital Multimeter Owner’s Manual

INNOVA 3320 Auto-Ranging Digital Multimeter

INTRODUCTION

• Congratulations. You have purchased a precision instrument manufactured to the highest quality standards. This Digital Multimeter is a general-purpose instrument designed for use in general electronics, home electrical applications, and automotive electrical/electronic systems.
• This meter is designed to test or measure AC voltage, DC voltage, batteries, DC current, AC current, resistance, diodes, and continuity.
• Please take the time to read these operating instructions thoroughly and completely. Failure to follow these instructions may result in electrical shock, instrument damage, and/or damage to the equipment under test. Always use extreme caution when working on or around electrically operated equipment.

Safety Precautions / Warnings

Do not operate this multimeter before reading this manual in its entirety. The following guidelines must be followed to avoid accidents that can result in electric shock or personal injury.

• Pay close attention to WARNINGS stamped on the front and rear of the meter’s case. These warnings, as well as all warnings and precautions used throughout this manual, must be followed to avoid electric shock and/or personal injury.
• The RESPONSIBLE PARTY shall be made aware that, if the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
• Before using any of the functions on this meter, verify its proper operation on a known similar function source where the unit value is also known. Take corrective action based on the indicated results.

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

• DO NOT apply more than the rated voltage, as marked on the meter, between terminals or between any terminal and earth ground.
• Use caution when working above 30V AC rms, 42 V peak, or 60 V DC. Such voltages pose a shock hazard.
• To avoid false readings that could lead to possible electric shock or personal injury, replace the batteries as soon as the low battery indicator displays.
• Always inspect the multimeter, test leads, and any other accessories for damage prior to every use. If any damage is found, do not use the tester until repairs are done.
• Always consider electrical and electronic equipment to be energized (live). Never assume any equipment is de-energized.
• Never ground yourself when taking electrical measurements. Isolate yourself from the 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 electronic equipment.
• Use one hand, instead of two, whenever possible to take measurements. If 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 instrument on a clean, insulating surface prior to taking any measurements.
• Don’t become part of the circuit. Think safety. Act safely.

If working on a vehicle, take the following added precautions:

• Only work on vehicles in a well-ventilated area.
• Always wear safety eye protection.
• Avoid moving fan blades or any potentially moving parts.
• Avoid hot engine parts.
• Put transmission in “park” (automatic transmission vehicles) or “neutral” (manual transmission vehicles). Set the parking brake.
• Turn the ignition “off” before connecting or disconnecting any testing equipment.
• Put blocks on the drive wheels.
• Avoid wearing loose clothing or jewelry when working on a vehicle.
• Read your vehicle’s service manual and follow its safety procedures.

CONTROLS AND INDICATORS

1. DCV Function: Measures DC volts. Auto-ranging from 0 to 600 volts (10 MW impedance)
2. ACV Function: Measures AC volts. Auto-ranging from 0 to 600 volts (10 MW impedance)
3. Resistance Function: Measures resistance. Auto-ranging from 0 to 20MW (20,000,000W).
4. ACmA Function: Measures AC current in milliamps. One range: 0 to 200 milliamps.
5. DIODE Function : For testing diodes.
6. CONTINUITY Function : Tests for continuity between two points.
7. Volts, mA, OHMS, BAT, DIODE, and CONTINUITY Input Jack.
8. COM Input Jack: Common Input Jack.
9. DC10A Input Jack: For red test lead probe connection when measuring high DC current (up to 10 amps only).
10. DC10A Function: Measures DC current. One range: 10 amps (DC from 0 to 10 amperes). Unfused.
11. DCmA Function: Measures DC current in Milliamps. One range: 0 to 200 milliamps.
12. Battery Test Function: Four ranges and three LEDS (green, yellow, and red). Tests small batteries; 1.5V, 6V, 9V and 12V.
13. OFF Function: Turns unit “off” when the function is selected.
14. Function/Range Selector Switch: Selects desired function or range.
15. Liquid Crystal Display (LCD): Displays results of tests or measurements.

PREPARATION AND CAUTION BEFORE USE.

WARNING

• 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, and 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

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 or take measurements if the voltage is unknown. 600V AC/DC between the COM and V jacks is the maximum voltage that this instrument is designed to measure. The “COM” terminal potential should not exceed 300V AC/DC measured to ground.

1. Plug the BLACK test lead into the “COM” jack of the multimeter; plug the RED test lead into the “V” jack.
2. Set the meter’s Function/Range Selector Switch to the appropriate ACV or DCV position as desired (see Controls and Indicators, Items 1 and 2).
3. Place the RED test lead onto the positive (+) side of the item being 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.
4. Read the results on the display.

B. RESISTANCE MEASUREMENT W (OHMS)

WARNING

• 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. Plug the RED test lead into the “Ω” jack of the multimeter; plug the BLACK test lead into the “COM” jack.

2. Set the meter’s Function/Range Selector Switch to the “Ω” range function (see Controls and Indicators, Item 3).
   NOTE: To obtain accurate readings, disconnect at least one side of the item under test from the circuit or circuit board before measuring resistance.

3. Place the RED test lead onto one side of the item being tested and the BLACK test lead onto the other side of the item. (Polarity does not matter when checking resistance).

4. Read the results on the display.

C. DIODE TEST

WARNING

• To avoid electrical shock and/or damage to the multimeter, ensure the power is removed from the circuit before any DIODE testing procedure is conducted. Test diodes on de-energized (dead) circuits only, never on live circuits.

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 of it from the circuit before testing. A good 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. Plug the RED test lead into the jack of the multimeter; plug the BLACK test lead into the “COM” jack.
2. Set the meter’s Function/ Range Selector Switch to the position (see Controls and Indicators, Item 5).
3. Place the RED test lead onto one side of the diode being tested and the BLACK test lead onto the other side.
4. Read the results on the display.
5. Reverse the test leads and again read the results on the display. Compare the two readings. One reading should indicate a voltage drop value; the other reading should indicate an overrange (OL) condition. See noteabove.

D. CONTINUITY TEST

WARNING

• To avoid electric shock, shut off the power to the test article before testing it for continuity.

1. Plug the RED test lead into the jack of the multimeter; plug the BLACK test lead into the “COM” jack.
2. Set the meter’s Function/Range Selector Switch to the position (see Controls and Indicators, Item 6).
3. Place the RED Test Lead to one end of the wire or device being tested for continuity and the BLACK Test Lead to the opposite end.
4. Listen to the sound of the beeper and confirm the results by reading the display.

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.

E. AC/DC CURRENT MEASUREMENT (AMPS)

WARNING

• To prevent electrical shock when performing current measurements, follow all steps as indicated below DO NOT skip any steps or take any shortcuts. The DC10A range is not fused. To avoid current hazards and/or damage to the tester, DO NOT try to take measurements on circuits that have more than 10 amps. DO NOT take more than 10 seconds to take the reading. A waiting period of AT LEAST 15 MINUTES is necessary between every 15 second testing period.

1. Plug the RED test lead into the “mA” or the “DC10A” jack of the multimeter, as applicable; plug the BLACK test lead to the “COM” jack.

2. Set the meter’s Function/Range Selector Switch to the appropriate Amps range position as desired (see Controls and Indicators, Items 4, 10 and 11).

   • To measure from 0 to 200mA, set the Selector Switch to the “DCmA” or “ACmA” position, as applicable.
   • To measure from 200mA to 10 Amps DC, set the Selector Switch to the “DC10A” position.

3. Disconnect the battery, or shut off the power to the circuit being tested.
   NOTE: To measure current on a particular circuit, you must open up the circuit and connect the test leads in series with the circuit before a reading can be obtained.

4. Disconnect one end of the wire or device, from the circuit where current will be measured.

5. Place the RED test lead on the disconnected wire and place the BLACK test lead at the location from which the wire was disconnected (series connection).

6. Reconnect the battery, or apply power to the circuit being tested.

7. Read the results on the display.

CAUTION: After the test is completed, shut the power off to the circuit before removing the test leads and before reconnecting any disconnected wires or devices.

NOTE: If the reading obtained is a negative number, reverse the test leads.

F. BATTERY TEST

1. Plug the RED test lead into the “BAT.” jack of the multimeter; plug the BLACK test lead into the “COM”jack.

2. Determine the voltage rating of the battery to be tested.

3. Set the meter’s Function/ Range Selector Switch to the desired “Battery Test” range (see Controls and Indicators, Item 12).

4. Place the RED test lead on the positive post of the battery under test; place the BLACK lead on the negative post.
   NOTE: If a battery is completely dead, or nearly dead (below 10% of its rated voltage), the red LED will not light.

5. Read the results using the display and the LEDs:

   • Green = fully charged (good battery)
   • Yellow = low (questionable)
   • Red = discharged (bad battery)

NOTE: Battery life is directly proportional to the current draw/load of the device that the battery is powering. The three LEDs on the multimeter represent battery state-of-charge averages for the most commonly used devices.

BATTERY AND FUSE REPLACEMENT

Battery and Fuse Replacement / Maintenance

WARNING

• When replacing the battery or the fuse, 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” and remove the test leads.

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

3. Replace the fuse or batteries as necessary:

   • For battery replacement: Remove the batteries from the battery compartment and replace only with two AA (1-½ volt) alkaline batteries.
   • For fuse replacement: Remove the fuse from the fuse holder and replace with a 0.315A/250V – UL Listed Bussmann, GMA Type (Radio Shack GMA/270 series; #270-1046 ) fuse.
     NOTE: Use a 0.315A/250V, 5x20mm type fuse ONLY – Bussmann, GMA Type (Radio Shack #270-1046 or similar). Using an incorrect fuse may result in serious injury and/or damage to the unit.

4. Reassemble the case and secure it with the two screws.

MAINTENANCE

1. No periodic maintenance is required other than the replacement of the battery, the fuse, and visual inspection ofthe 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.
3. The only replaceable parts are the 1.5 AA batteries, 0.315A/250V fuse (see page 10 for battery and fuse replacement) and the Test Leads (for Test Leads call service department).

SPECIFICATIONS

GENERAL SPECIFICATIONS AND FEATURES

•  3-½ digit LCD display (maximum reading of 2000); 3 LEDs; green, yellow and red
• Auto Range (ACV, DCV, Ohm, AC mA, and DC mA)
• Automatic negative (-) polarity indication
• Automatic zero adjustment
• Over range indicator (except 10 A function). Displays “OL” on LCD
• Low battery indicator. Displays battery symbol on LCD
• Automatic power shut off (after 15 idle minutes)
• Pollution Degree 2
• Measuring Circuit Category II
• 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 1.5V AA batteries
• Fuse: 315mA/250V 5X20 mm (Radio Shack, GMA/217 series; #270-1046) fuse
• Dimensions:
  • Height – 5.50 in. (139 mm)
  • Width – 3.50 in. (89 mm)
  • Depth – 1.25 in. (32 mm)
• Weight (including batteries): approximately 6.3 oz (180 g)

ELECTRICAL SPECIFICATIONS

DC VOLTS

±(0.8% of

reading

+ 5 digits)

| ****

Input Resistance: 10MÙ Overload Protection: 600V DC or AC 600V RMS

2000V| 1mV
20.00V| 10mV
200.0V| 100mV
600V| 1V

AC VOLTS

±(1.2% of

reading

+ 5 digits)

| Input Resistance: 10MÙ Overload Protection: 600V DC or AC 600V RMS.

Frequency Response: 50 Hz – 400Hz

20.00V| 10mV
200.0V| 100mV
600V| 1V

RESISTANCE (OHMS)

±(1.0% of

reading

+5 digits)

| ****

Overload Protection: 250V DC or AC RMS.

2000kÙ| 1Ù
20.00kÙ| 10Ù
200.0kÙ| 100Ù
2.000MÙ| 1kÙ
20.00MÙ| 10kÙ| ±(2.0% of

reading

+5 digits

DC AMPS

reading

+ 5 digits)

| Overload Protection: Fuse 315mA/250V

Input Voltage Drop: < 0.2V.

200.0mA| 100mA
2.000A| 1mA| ±(2.0% of

reading

+ 5 digits)

| Unfused; 15sec maximum Input Voltage Drop: < 0.2V.
10.00A| 10mA
A waiting period of at least 15 minutes is necessary between every 15 second testing period.

AC AMPS

reading

+ 5 digits)

| Overload Protection: Fuse 315mA/250V

Input Voltage Drop: < 0.2V.

200.0mA| 100mA

BATTERY TEST (LEDs)

When the voltage _of the battery being tested is lower than 10% of its rated voltage, the red LED will not light._

Range

| ****

Resolution

| Load Current| ****

Accuracy

| ****

Notes

1.5V

| ****

0.001V

| ****

10mA

(approx.)

| ****

±(5% of reading

+5 digits)

| Green LED: 1.30V

±0.075V and up.

Yellow LED: 0.94V

±0.075V to 1.29V

±0.075V.

Red LED: 0.15V±0.075V  to 0.93V±0.075V

6V

| ****

0.01V

| ****

100mA

(approx.)

| Green LED: 5.22V

±0.3V and up.

Yellow LED: 3.76V

±0.3V to 5.21V±0.3V. Red LED: 0.6V±0.3V to 3.75V±0.3V

9V

| ****

0.01V

| ****

10mA

(approx.)

| Green LED: 7.83V

±0.45V and up.

Yellow LED: 5.64V

±0.45V to 7.82V±0.45V.

Red LED: 0.9V±0.45V to 5.63V±0.45V

12V

| ****

0.01V

| ****

200mA

(approx.)

| Green LED: 10.44V

±0.6V and up.

Yellow LED: 7.52V

±0.6V to 10.43V±0.6V. Red LED: 1.2V±0.6V to 7.51V±0.6V

DIODE/CONTINUITY TESTS

Test Voltage: Approx. 1.5V

| ****

Overload Protection: 250V DC or AC RMS

Continuity Test| 200Ù| 0.1Ù| Approx. 120Ù or less, buzzer (beeper) will sound

SERVICE PROCEDURES

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 Technical 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 re-manufactured, assume this warranty period for only the remaining time of this warranty. Their warranties 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 Technical Service Center. Consequential and incidental damages are not recoverable under this warranty. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights, which vary from state to state. No portion of this warranty may be copied or duplicated without the expressed written permission from the Manufacturer.

Obtaining Warranty Service:

Products requiring service should be returned as follows:

1. Call the Technical Service Center to obtain a Return Reference Number.
2. Package the product carefully to prevent shipping damage
3. Include your name, return address, and a day contact phone
4. Enclose a copy of the dated sales receipt
5. Describe the problem
6. Ship prepaid to: Technical Service Center, 17352 Von Karman Ave., Irvine, CA 92614 U.S.A.
   • Phone: 1-800-544-4124 or 714-241-6805
   • Fax: 714-432-3979
   • Web: www.equus.com
   • Email: service@equus.com

www.equus.com

FREQUENTLY ASKED QUESTIONS

What are the primary features of the INNOVA 3320 Auto-Ranging Digital Multimeter?

The INNOVA 3320 Auto-Ranging Digital Multimeter offers auto-ranging capability, allowing for easy measurement of voltage, current, and resistance. It also includes features like diode testing and continuity checking.

What type of power source does the INNOVA 3320 Auto-Ranging Digital Multimeter use?

The INNOVA 3320 Auto-Ranging Digital Multimeter is powered by 1 AAA battery, providing convenient and portable operation.

What are the dimensions and weight of the INNOVA 3320 Auto-Ranging Digital Multimeter?

The INNOVA 3320 Auto-Ranging Digital Multimeter measures 2 x 10 x 5 inches and weighs approximately 8 ounces, making it compact and lightweight for easy handling.

What is the specification met by the INNOVA 3320 Auto-Ranging Digital Multimeter?

The INNOVA 3320 Auto-Ranging Digital Multimeter meets UL (Underwriters Laboratories) specifications, ensuring safety and quality standards are met.

Who is the manufacturer of the INNOVA 3320 Auto-Ranging Digital Multimeter?

The INNOVA 3320 Auto-Ranging Digital Multimeter is manufactured by INNOVA, a trusted brand known for producing high-quality automotive diagnostic tools and instruments.

What is the price of the INNOVA 3320 Auto-Ranging Digital Multimeter?

The INNOVA 3320 Auto-Ranging Digital Multimeter is priced at $28.94, offering affordable access to reliable auto-ranging functionality and measurement capabilities.

What warranty is provided with the INNOVA 3320 Auto-Ranging Digital Multimeter?

INNOVA offers a one-year warranty for the 3320 Auto-Ranging Digital Multimeter, providing assurance against any manufacturing defects or issues for the specified period.

How does the auto-ranging feature work on the INNOVA 3320 Auto-Ranging Digital Multimeter?

The auto-ranging feature on the INNOVA 3320 Digital Multimeter automatically selects the appropriate measurement range based on the input signal, simplifying the measurement process for the user.

What steps should I take if I encounter issues with the display screen on my INNOVA 3320 Auto-Ranging Digital Multimeter?

If there are issues with the display screen, check the battery level and connections first. If the issue persists, contact INNOVA customer support for guidance on troubleshooting and potential resolution options for the 3320 model.

What should I do if the display screen on my INNOVA 3320 Auto-Ranging Digital Multimeter is not showing any readings?

First, ensure that the multimeter is turned on and the leads are properly connected to the test points. Check the battery compartment to ensure the battery is inserted correctly and has sufficient charge.

Why am I getting inconsistent or erratic readings on my INNOVA 3320 Auto- Ranging Digital Multimeter?

Inconsistent readings may indicate poor contact between the test leads and the test points. Ensure that the leads are securely connected and that there are no loose connections. Additionally, check for any signs of damage to the leads or the multimeter itself.

How can I troubleshoot issues with the auto-ranging feature on my INNOVA 3320 Auto-Ranging Digital Multimeter?

If the auto-ranging feature is not functioning properly, ensure that the input signal is within the measurement range of the multimeter. Check the user manual for guidance on how to manually select the appropriate range if needed

What steps should I take if the continuity testing function is not working on my INNOVA 3320 Auto-Ranging Digital Multimeter?

Ensure that the test leads are making good contact with the test points and that the continuity threshold is correctly set. Clean the test leads and test points to remove any dirt or debris that may be affecting the connection.

Why is my INNOVA 3320 Auto-Ranging Digital Multimeter not powering on at all?

Check the battery compartment to ensure that the battery is inserted correctly and has sufficient charge. If the battery is properly installed and the multimeter still does not power on, contact INNOVA customer support for further assistance with troubleshooting the 3320 model.

How do I address issues with the rotary dial selector on my INNOVA 3320 Auto- Ranging Digital Multimeter?

If the rotary dial selector is not functioning correctly, ensure that it is not obstructed or stuck between positions. Gently rotate the dial through its entire range to see if it frees up.

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