MasterCraft 052-0055-6 Instruction Manual

MANUAL
DIGITAL MULTIMETER

INSTRUCTION
MANUAL

model no. 052-0055-6

Read and understand this instruction manual thoroughly
before using the product. It contains important
information for your safety as well as operating and
maintenance advice.
Keep this instruction manual for future use. Should this
product be passed on to a third party, then this
instruction manual must be included.

SAFETY INFORMATION

This meter has been designed according to IEC 61010 concerning
electronic measuring instruments with a measurement category
(CAT III 300V) and pollution degree 2.

2

WARNING

WARNING

To avoid possible electric shock or personal injury, follow these
guidelines:

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Do not use the meter if it is damaged. Before you use the meter,
inspect the case. Pay particular attention to the insulation
surrounding the connectors.
Inspect the test leads for damaged insulation or exposed metal.
Check the test leads for continuity. Replace damaged test leads
before you use the meter.
Do not use the meter if it operates abnormally. Protection may
be impaired. When in doubt, have the meter serviced.
Do not operate the meter where explosive gas, vapour, or dust
is present.
Do not apply more than the rated voltage, as marked on the
meter, between terminals or between any terminal and earth
ground.
Before use, verify the meter's operation by measuring a
known voltage.
When measuring current, turn off circuit power before connect­ing the meter in the circuit. Remember to place the meter in
series with the circuit.
When servicing the meter, use only specified replacement parts.

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Use caution when working with voltage above 30 V AC RMS,
42 V peak, or 60 V DC. Such voltages pose a shock hazard.
When using the probes, keep your fingers behind the finger
guards on the probes.
Connect the common test lead before you connect the live test
lead. When you disconnect test leads, disconnect the live test
lead first.
Remove the test leads from the meter before you open the
battery cover or the case.
Do not operate the meter with the battery cover or portions of
the case removed or loosened.
To avoid false readings, which could lead to possible electric
shock or personal injury, replace the battery as soon as the low
battery indicator ( ) appears.
Do not use the meter in a manner not specified by this manual
or the safety features provided by the meter may be impaired.
Adhere to local and national safety codes. Individual protective
equipment must be used to prevent shock and arc blast injury
where hazardous live conductors are exposed.
To avoid electric shock and personal injury, do not touch any
naked conductor with hand or skin; and do not ground yourself
while using this meter.
Do not use the meter if the meter, a test lead or your hand is wet.
Remaining endangerment:
When an input terminal is connected to dangerous live potential,
it is to be noted that this potential can occur at all other terminals!

model no. 052-0055-6 | contact us 1-800-689-9928

3

WARNING

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CAT III - Measurement Category III is for measurements performed
in building installation. Examples are measurements on
distribution boards, circuit breakers, wiring, including cables,
bus-bars, junction boxes, switches, socket-outlets in the fixed
installation, and equipment for industrial use and some other
equipment, for example, stationary motors with permanent
connection to the fixed installation. Do not use the meter for
measurements within Measurement Categories IV.

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WARNING

To avoid possible damage to the meter or to the equipment under
test, follow these guidelines:

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Disconnect circuit power and discharge all capacitors thorough­ly before testing resistance, diode, continuity or temperature.
Use the proper terminals, function and range for your measurements.
Before measuring current, check the meter's fuses and turn off
power to the circuit before connecting the meter to the circuit.
Before turning the rotary switch to change functions, disconnect
the test leads from the circuit under test.

Alternating current
Direct current
Both direct and alternating current

Caution, risk of danger. Refer to the operating manual before
use.

Caution, risk of electric shock.
Earth (ground) terminal

Fuse
Conforms to European Union directives

The equipment is protected throughout by double insulation or
reinforced insulation.

CAUTION

ELECTRICAL SYMBOLS

model no. 052-0055-6 | contact us 1-800-689-9928

5

CAUTION

This meter is a compact 3 1/2-digit digital multimeter designed to
measure DC and AC voltage, DC and AC current, resistance, continuity,
diode, battery and temperature. In addition, non-contact AC voltage
detection, live AC wire detection and illumination functions are also
provided. It features polarity indication, data hold, full-range overload
protection, and more. It is easy to operate and is a very useful test
tool.

FRONT PANEL

INTRODUCTION

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3

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678

9

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1

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INTRODUCTION

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

Display

3 1/2-digit LCD, with a max. reading of 1999.

"AC/DC" Button

Used to switch between DC and AC functions.

AC Voltage Detection Button
Backlight Button

Press this button to turn on or off the backlight. The backlight
will turn off automatically about 30 secs after it is turned on.

Function/Range Switch

Used to select desired function or range as well as to turn on or
off the meter. To preserve battery life, set the function/range
switch in the "OFF" position when the meter is not in use.

"10A" Terminal

Plug-in connector for the red test lead for current (200 mA

–

10 A)

measurements.

"COM" Terminal

This terminal is a plug-in connector for the black test lead. It is
also a plug-in connector for the negative (-) plug of a K type
thermocouple for temperature measurements.

"VmAºF" Terminal

This terminal is a plug-in connector for the red test lead for all
measurements except temperature measurements and the
current measurements ≥ 200 mA.
It is also a plug-in connector for the positive (+) plug of a K type
thermocouple for temperature measurements.

Illumination Button

Press and hold down this button to turn on the illumination
lamp. To turn off the illumination lamp, just release this button.

AC Voltage Detection Indicator

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INTRODUCTION

GENERAL SPECIFICATIONS

SPECIFICATIONS

11.

12.

13.

"H" Button

Used to enter/exit Data Hold mode.

Holster
Illumination Lamp

Display: 3 1/2-digit LCD, with a max. reading of 1999
Negative Polarity Indication:

Negative sign " - " shown on the display automatically
Sampling Rate: About 2

–

3 times/sec

IP Degree: IP20
Battery: 9 V battery, 6F22 or equivalent, 1 pieces
Low Battery Indication: " " shown on the display
Operating Environment: Temperature: 32 to 104ºF (0 to 40°C)

Relative Humidity: < 75%
Storage Environment: Temperature: 14 to 122ºF (-10 to 50ºC)
Relative Humidity: < 85%

Size: 6 11/16 x 3 3/8 x 1 9/16" (170 x 86 x 40 mm)
Weight: About 10 1/4 oz (291 g) (including battery)

Readings are accurate for a period of one year after calibration at 64
to 82ºF (18 to 28ºC), with relative humidity < 75%.

Accuracy specifications take the form of:

±([% of Reading] + [number of Least Significant Digits])

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TECHNICAL SPECIFICATIONS

DC VOLTAGE

Input Impedance: 10 MΩ
Max. Allowable Input Voltage: 300 V DC

RANGE

200 mV 100 V ±(0.5% + 5)

±(1.0% + 5)

±(0.8% + 5)

"OL" shown

on the display

1 mV

10 mV

100 mV

1 V

2 V

20 V

200 V
300 V

RESOLUTION ACCURACY

OVERRANGE

INDICATION

AC VOLTAGE

Frequency Range: 40 – 400 Hz
Response: Average, calibrated in RMS of sine wave
Max. Allowable Input voltage: 300 V AC RMS

RANGE

200 mV 100 V ±(1.0% + 5)

±(1.2% + 5)

"OL" shown

on the display

1 mV

10 mV

100 mV

1 V

2 V

20 V

200 V
300 V

RESOLUTION ACCURACY

OVERRANGE

INDICATION

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9

TECHNICAL SPECIFICATIONS

AC CURRENT

RANGE

20 mA 10 A ±(1.3% + 5)

±(3.0% + 5)

±(1.8% + 5)

"OL" shown

on the display

——— [ 1 ]

100 A

10 mA

200 mA

10 A

RESOLUTION ACCURACY

OVERRANGE

INDICATION

[ 1 ]

DC CURRENT

Overload Protection:

250 mA/300 V FAST Fuse (for "ΩVmA°F" terminal inputs)
10 A/300 V FAST Fuse (for "10A" terminal inputs)
Max. Allowable Input Current: 10 A
(For inputs > 2 A: measurement duration < 10 secs, and interval >
15 minutes)

If the current being measured is > 10 A, the display may show
the value of the current; but the measurement is dangerous.

RANGE

20 mA 10 A ±(1.0% + 5)

±(2.0% + 5)

±(1.5% + 5)

"OL" shown

on the display

——— [ 1 ]

100 A

10 mA

200 mA

10 A

RESOLUTION ACCURACY

OVERRANGE

INDICATION

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TECHNICAL SPECIFICATIONS

[ 1 ]

Overload Protection:
250 mA/300 V FAST Fuse (for "ΩVmA°F" terminal inputs)
10 A/300V FAST Fuse (for "10A" terminal inputs)
Max. Allowable Input Current: 10A
(For inputs > 2 A: measurement duration < 10 secs, and interval >
15 minutes)

Frequency Range: 40 – 400 Hz
Response: Average, calibrated in RMS of sine wave

Max. Open Circuit Voltage: About 2.8 V

If the current being measured is > 10 A, the display may show
the value of the current; but the measurement is dangerous.

RESISTANCE

RANGE

200 Ω 0.1 Ω

±(1.2% + 5)

±(1.5% + 7)

"OL" shown

on the display

1 Ω

10 Ω

100 Ω

1 kΩ

10 kΩ

2 kΩ

20 kΩ

200 kΩ

2 MΩ

20 MΩ

RESOLUTION ACCURACY

OVERRANGE

INDICATION

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11

TECHNICAL SPECIFICATIONS

TEMPERATURE

[ 1 ] If the temperature being measured is out of the range of 32 to

1832ºF (0 to 1000ºC) the display may show a reading, but the
measurement error may be large or the thermocouple may be
damaged.

1.

2.

3.

Use a K type thermocouple.
Accuracy does not include error of the thermocouple
probe.
Accuracy specification assumes ambient temperature
is stable to ±1.8ºF (1ºC). For ambient temperature
changes of ±9ºF (5ºC), rated accuracy applies after 1
hour.

Note:

RANGE

32 to 752ºF (0 to 385ºC)

1ºF (0.6ºC)

±(1.0% + 5)

±(2.5% + 10)

——— [ 1 ]

752 to 1832ºF (385 to
1000ºC)

RESOLUTION ACCURACY

OVERRANGE

INDICATION

BATTERY TEST

RANGE

1.5 V about 20 mA
about 5 mA
about 4 mA

9 V

12 V

DESCRIPTION TEST CURRENT

The working voltage of the battery will
be shown on the display so that the
quality of the battery can be judged.

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TECHNICAL SPECIFICATIONS

DIODE AND CONTINUITY TEST

OPERATING INSTRUCTIONS

DATA HOLD MODE

Press the "H" button to hold the present reading on the display, " "
will appear on the display as an indication.
To exit Data Hold mode, press the button again. " " disappears.

RANGE DESCRIPTION TEST CURRENT

The approx. forward voltage drop
of the diode will be displayed.

The built-in buzzer will sound if
the resistance is less than
about 20 Ω.
The buzzer may or may not
sound if the resistance is
between 20 Ω and 100 Ω.
The buzzer will not sound if the
resistance is more than 100 Ω.

Open Circuit Voltage:
about 2.8 V
Test Current:
about 1 mA

Open Circuit Voltage:
about 2.8 V

model no. 052-0055-6 | contact us 1-800-689-9928

13

TECHNICAL SPECIFICATIONS

MEASURING DC OR AC VOLTAGE

MEASURING DC OR AC CURRENT

1.

2.

3.

4.

5.

Connect the black test lead to the "COM" terminal and the red
test lead to the "ΩVmA°F" terminal.
Set the range switch to desired V range position. If the
magnitude of the voltage to be measured is not known
beforehand, set the range switch to the highest range first and
then reduce it range by range until satisfactory resolution is obtained.
Select DC or AC voltage measurement with the "AC/DC" button
according to the marks beside this button.
Connect the test leads across the source or circuit to be tested.
Read the reading on the display. For DC voltage measurements,
the polarity of the red test lead connection will be indicated as well.

1.

2.

3.

4.

5.

6.

Connect the black test lead to the "COM" terminal. Connect the
red test lead to the "ΩVmA°F" terminal if the current to be
measured is less than 200 mA. If the current is between 200 mA
and 10 A, connect the red test lead to the "10A" terminal instead.
Set the range switch to desired A range position.
Select DC or AC current measurement with the "AC/DC" button
according to the marks beside this button.
Turn off power to the circuit to be tested. Then discharge all
high-voltage capacitors.
Break the circuit path to be tested, then connect the test leads
in series with the circuit.
Turn on power to the circuit, then read the reading on the display.
For DC current measurements, the polarity of the red test lead
connection will be indicated as well.

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OPERATING INSTRUCTIONS