Equus 3340 User Manual

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Table of Contents

Title Page No.

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

SAFETY PRECAUTIONS/WARNINGS . . . . . . . . . . . . . . . . .2

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

CONTROLS AND INDICATORS . . . . . . . . . . . . . . . . . . . . . .8

TESTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . .10

AUXILIARY FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . .16

BATTERY AND FUSE REPLACEMENT . . . . . . . . . . . . . . .17

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

SERVICE PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . .22

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INTRODUCTION

•

Congratulations.You have purchased a precision instrument
manufactured to the highest quality standards. This Digital
Automotive Tester is a general-purpose instrument designed
for use in general electronics, home electrical applications,
and automotive electrical/electronic systems.

•

This tester is designed to test or measure AC voltage, DC
voltage, batteries, DC current, AC current, resistance,
diodes, continuity, frequency, duty cycle, pulse width, rpm
and temperature.

•

Please take the time to read these operating instructions thor­oughly and completely .Failure to f ollow these instructions ma y
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 tester 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 tester’s case.These warnings, as well as all
warnings and precautions used through out 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 tester, 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 tester, 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.

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Always inspect the tester, test leads and any other acces­sories for 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).Never assume any equipment is de-energized.

•

Do not connect probes to any available (un used) terminal while
the meter is connected to a hazardous live circuit.

•

Never ground yourself when taking electrical measurements.
Isolate 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 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 tester when taking measurements. Place the
tester on a clean, insulating surf ace prior to taking any meas­urement.

•

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.

•

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 drive wheels.

•

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

•

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

SPECIFICATIONS

GENERAL SPECIFICATIONS AND FEATURES

•

3-3/4 digit LCD display (maximum reading of 4000)

•

Range Control: Auto Range

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Automatic negative (-) polarity indication

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Automatic zero adjustment

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Over range indicator (except 15 A function).Displays "OL" on
LCD

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Low battery indicator.Displays battery symbol on LCD

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Automatic power shut off (after 10 idle minutes)

•

Pollution Degree 2

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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: 0.500A/250V 5X20 mm (Radio Shack, GMA/270
series; #270-1047) fuse

•

Dimensions:
Height - 6.81 in. (173 mm)

Width - 6.57 in. (167 mm) (includes test lead clips)
Depth - 1.69 in. (43 mm)

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Weight (including batteries): approximately 9.1 oz (260 g)

ELECTRICAL SPECIFICATIONS

DC VOLTS

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Range Resolution Accuracy Overload Protection

400mV 100µV 250V DC RMS
4V 1mV

±(0.8% of

40V 10mV

reading

400V

+ 5 digits)

600V DC/AC RMS

600V

1V

±(0.8% of
reading

+ 5 digits)

Input impedance: 10MΩ for all ranges.

AC VOLTS

RESISTANCE (OHMS)

DC CURRENT (AMPS)

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Range Resolution Accuracy Overload Protection

40mA 10µA

±(1.5% of 0.5A/250V fast fuse
reading (Input Voltage

400mA 100µA

+ 5 digits) Drop: <

0.2V.

±(2.5% of

Unfused; 15sec maximum

*15A 10mA reading

Input Voltage Drop: <

0.2V.

+ 5 digits)

*A waiting period of at least 15 minutes is necessary between
every 15 second testing period.

Range Resolution Accuracy Overload Protection

400Ω 0.1Ω
4kΩ 1Ω

±(1.0% of

40kΩ 10Ω

reading

400kΩ 100Ω

+ 5 digits)

250V DC/AC

4MΩ ±(2.0% of
40MΩ

10kΩ

reading
+ 5 digits)

Range Resolution Accuracy Overload Protection

400mV 100µV ±(1.2% of 250V DC RMS

reading
+8 digits)

4V 1mV

±(0.8% of

40V 10mV

reading

400V

+ 8 digits)

600V DC/AC RMS

600V

1V

±(1.2% of
reading

+ 8 digits)

Input impedance: 10MΩ for all ranges.
Frequency response: 50 - 400Hz

AC CURRENT (AMPS)

BA TTER Y TEST

DIODE/CONTINUITY TESTS

TEMPERA TURE

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Function Range Resolution Description Note

Diode Test 2V 1mV Test Current:

1±0.6mA
Test Voltage:

Overload

Approx. 2.8V

Protection:

Continuity 400Ω 0.1Ω Approx.120Ω or

250V DC or

Test less, buzzer

AC RMS

(beeper) will
sound

Range Resolution Accuracy Overload Protection

40mA 10µA ±(2.0% of

0.5A/250V fast fuse

400mA 100µA reading

+ 5 digits)

Input Voltage Drop: <0.2V.

Frequency response: 50 - 400Hz

Range Resolution DC Current Load

1.5V
9V 10mV 10mA

Range Accuracy Overload Protection

32°F to 104°F ±5°F/±3°C
(0°C to 40°C)

-58°F to 392°F ±1.5%/±5°F
(-50°C to 200°C) (±1.5%/±3°C) 0.5A/250V fast fuse

392°F to 752°F ±2%/±5°F
(200°C to 400°C) (±2%/±3°C)

WARNING

To avoid fire and/or electrical shock hazards, DO NOT con­nect the thermocouples to circuits greater than 30 Vrms, 42.4
Vpk or 60 Vdc.

FREQUENCY

DUTY CYCLE/PULSE WIDTH/DWELL

RPM

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Range Resolution Accuracy Overload Protection

9.999Hz- 0.001Hz ±(0.1% of
2MHz reading 250V DC or AC RMS

+ 5 digits)

Sensitivity: <100kHz: 2V RMS; >100kHz: 5V RMS

Function Range Accuracy Overload Protection

Duty Cycle 0.1 to ±(2.0% of

99.9% reading
+ 5 digits)

Pulse Width 1 to 999 ±(3.0% of 0.5A/250V fast fuse

ms positive reading

±2 ms)

Dwell Angle 1-12 ±(2.0% of

cylinders reading

+ 5 digits)

Range Resolution Accuracy Overload Protection

0-10000 1RPM ±(2.0% of
RPM reading 0.5A/250V fast fuse

+ 5 digits)

Frequency response: 50 - 400Hz

WARNING

Risk of Explosion. This equipment has internal arcing and

sparking parts, which should not be exposed to flammable
vapors. This equipment is only suitable for installation in a
garage having sufficient air circulation to be considered a
non-hazardous location.

WARNING

Ignition coils produce a very high voltage.To reduce the risks
of electric shock when conducting RPM tests, DO NOT touch
the uninsulated ends of the test probes, the ignition coil, or
the coil terminals when the engine is running.