MasterCraft 052-0726-0 Instruction Manual

SMART
MULTIMETER

INSTRUCTION
MANUAL

model no. 052-0726-0

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.

SMART MULTIMETER 052-0726-0

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

WARNING

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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 the probes or between any probe and earth
ground.
Before use, verify the meter's operation by measuring a known
voltage.
When servicing the meter, use only specified replacement parts.
Use caution when working with voltage above 30 V AC RMS, 42
V peak, or 60 V DC. Such voltages pose a shock hazard.

SAFETY INFORMATION

The multimeter has been designed according to IEC 61010 concern­ing electronic measuring instruments with a measurement category
(CAT III 600V) and pollution degree 2.

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WARNING

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WARNING

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When using the probes, keep your fingers behind the finger
guards on the probes.
When making connections, connect the black test lead before
you connect the red test lead. When you disconnect test leads,
disconnect the red test lead first.
Remove the test leads from the circuit under test before you
open the back cover.
Do not operate the meter with the back cover removed or
loosened.
To avoid false readings, which could lead to possible electric
shock or personal injury, replace the button cells as soon as the
low battery indicator ( ) appears.
To avoid electric shock, do not touch any naked conductor with
your hand or skin, and do not ground yourself while using the
meter.
When a probe is connected to dangerous live potential, it is to
be noted that this potential can occur at the other probe!

CAT III

– Measurement Category III is for measurements
performed in the 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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CAUTION

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

Disconnect circuit power and discharge all capacitors before
testing resistance, capacitance or continuity.
Use the proper function for your measurements.
Before pressing the "SELECT" key to change function, disconnect
the test leads from the circuit under test.

CAUTION

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This meter is a compact 3 5/6-digit digital multimeter for measuring
DC and AC voltage, resistance, frequency, capacitance and continui­ty. In addition, non-contact AC voltage detection function is also
provided. The meter is operated through a key. In Auto Check mode,
the meter automatically selects measurement function of DC
voltage, AC voltage, or resistance based on the input via the test
leads. It features small size and lightness, and it is easy to operate.

Alternating current
Direct current
Caution, risk of danger. Refer to the operating manual before

use.
Caution, risk of electric shock.

Earth (ground) terminal
Conforms to European Union directives
The equipment is protected throughout by double insulation or

reinforced insulation.

INTRODUCTION

ELECTRICAL SYMBOLS

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INTRODUCTION

FRONT PANEL

1.

2.

3.

Display

3 5/6-digit LCD, with a max.
reading of 5999.

"SELECT" Key

Used to select desired function
or mode as well as to turn on
or off the meter.
Test Probes

1

2

3

GENERAL SPECIFICATION:

3 5/6-digit LCD, with a max. reading of 5999.
Negative Polarity Indication: Negative sign " - " shown
on the display automatically

Overrange Indication: "OL" shown on the display
Sampling Rate: About 2 to 3 times/sec
Battery: 1.5 V button cell, LR44 or equivalent, 2 pieces
Low Battery Indication: " " shown on the display
Operation Environment: Temperature: 32 to 104ºF (0 to 40ºC)

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

Operating Altitude: 0 – 6560' (0 – 2000 m)
Size: 4 7/16 x 2 1/8 x 1/2" (112 x 54 x 12 mm) (for main body only)
Weight: About 2 1/2 oz (70 g) (including button cell)

Figure 1

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INTRODUCTION

SPECIFICATIONS

DC VOLTAGE

Readings are accurate for a period of 1 year after calibration at
64 to 82ºF (18 to 28ºC), with relative humidity up to 75%.

Accuracy specifications take the form of:

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

Input Impedance: 10 MΩ
Max. Allowable Input Voltage: 600 V
Note: In Auto Check mode, the minimum input DC voltage

required for DC voltage measurement is 1.2 V.

RANGE

6 V 0.001 V

±(0.8% + 3)0.01 V

0.1 V

60 V

600 V

RESOLUTION ACCURACY

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TECHNICAL SPECIFICATIONS

AC VOLTAGE

RESISTANCE

Input Impedance: 10 MΩ
Frequency Range: 40 – 400 Hz
Max. Allowable Input Voltage: 600 V
Response: Average, calibrated in RMS of sine wave
Note: In Auto Check mode, the minimum input AC voltage

required for AC voltage measurement is 1.5 V.

Open Circuit Voltage: About 0.7 V

RANGE

6 V

600 Ω 0.1 Ω

0.001 kΩ

0.01 kΩ

0.1 kΩ

0.001 MΩ

0.01 MΩ

6 kΩ

60 kΩ

600 kΩ

6 MΩ

10 MΩ

0.001 V
±(1.0% + 5)

±(2.0% + 10)

±(1.2% + 6)

±(1.0% + 4)

±(2.0% + 4)

0.01 V

0.1 V

60 V

600 V

RESOLUTION ACCURACY

RANGE RESOLUTION ACCURACY

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TECHNICAL SPECIFICATIONS

CAPACITANCE

NON-CONTACT AC VOLTAGE DETECTION

Measurement Range: 1 nF – 100 F

Detection Range: 50 – 600 V
Frequency Response: 50/60 Hz

40 nF 0.01 nF

0.1 nF

0.001 F

0.01 F

0.1 F

400 nF

4 F

40 F

100 F

±(4.0% + 5)

±(5.0% + 5)

RANGE RESOLUTION ACCURACY

FREQUENCY

Input Voltage: 1 – 20 V RMS
Measurement Range: 1 Hz – 100 kHz

10 Hz 0.001 Hz

0.01 Hz

0.1 Hz

0.001 kHz

0.01 kHz

100 Hz

1 kHz

10 kHz

100 kHz

±(1.0% + 4 )

RANGE RESOLUTION ACCURACY

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TECHNICAL SPECIFICATIONS

CONTINUITY TEST

RANGE RESOLUTION ACCURACY

If the resistance is less than
about 50 , the built-in buzzer
will sound continuously and
the display will change from
" " to " ".

If the resistance is more than
150 , the buzzer will not
sound and the display will
show " ".

If the resistance is between
50  and 150 , the buzzer
may or may not sound and the
display will change with the
buzzer's behavior.

Open Circuit Voltage:
about 0.7 V

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ITECHNICAL SPECIFICATIONS

NOTE:

The meter has a process of initialization before it enters
non-contact AC voltage detection mode. During this process,
the meter will not respond if you press the "SELECT" key. Only
after the process finishes (the display shows " " and the
built-in buzzer does not sound) can you press the "SELECT"
key to change meter function.

Instruction for the "SELECT" Key

Press and hold down the "SELECT" key for about 3 secs to turn on
the meter. The meter enters Auto Check mode.
In Auto Check mode, press the "SELECT" key to step through the
functions:
Auto Check mode (default) → continuity test →
non-contact AC voltage detection → AC voltage measurement →
DC voltage measurement → resistance measurement →
frequency measurement → capacitance measurement →
Auto Check mode.

Pressing and holding down the "SELECT" key for about 3 secs will
turn off the meter.

OPERATING INSTRUCTIONS

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OPERATING INSTRUCTIONS

AUTO CHECK MODE

1.

2.

3.

4.

In Auto Check mode, the meter automatically selects measurement
function of DC voltage, AC voltage or resistance based on the input
via the test leads.

With no input, the display shows " ".
With no voltage signal, but a resistance below 10 M present,
the meter displays the resistance value.
When a signal ≥ DC 1.2 V or AC 1.5 V is present, the display
shows the voltage value in DC or AC, whichever larger in peak
magnitude.
Overload Alarm:
When the input voltage is ≥ 610 V, the built-in buzzer will
sound beeps and the display will show "OL".

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OPERATING INSTRUCTIONS

CONTINUITY TEST FUNCTION

In Auto Check mode, press the "SELECT" key once to select continu­ity test function.

Connect the test leads across the circuit to be tested.

If the resistance is more than 150 , the built-in buzzer will not
sound, and the display will show " ".

If the resistance is less than about 50 , the buzzer will sound
continuously and the display will change from " " to
" ".

If the resistance is between 50  and 150 , the buzzer may or may
not sound and the display will change with the buzzer's behavior.

Before test, disconnect all power to the circuit to be tested and
discharge all capacitors thoroughly.

NOTE:

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OPERATING INSTRUCTIONS