Mastech MS2015B User manual

MS2015B
AC Digital Clamp Meter
User Manual
%
kHz
NCV°F
mVA°C
nµmF
MKΩHz
INR
0 10 20 30 40 50 60 66
Z
REL
Temp
NVC
6600
FUNC
MAX
MIN REL HOLD
MS2015B AC CLAMP METER

CONTENTS CONTENTS
1. Safety Information.............................1
1.1 Preliminary...............................................1
1.2 Usage ......................................................1
1.3 Symbols...................................................3
1.4 Maintenance...........................................3
2. Description........................................4
2.1 Part Name................................................5
2.2 Switch, Button and
Input Jack Description..........................7
2.3 LCD Display.............................................7
3. Specifications...................................9
3.1 General ...................................................9
3.2 Technical Indicators................................10
4. Operating Guidance........................13
4.1 Reading Hold.........................................13
4.2 Relative Measurement............................13
4.3 Manual Measuring Range Choice............14
4.4 Function Switch.....................................14
4.5 Back light and
Clamp Head light...................................14
4.6 Automatic Power-Off.................................15
4.7 Measurement Preparation........................16
4.8 Current Measurement ..............................16
4.9 AC voltage Measurement..........................17
4.10 DC Voltage Measurement........................18
4.11 Measure Frequency................................19
4.12 Resistance Test.....................................19
4.13 Diode Test.............................................20
4.14 Circuit Continuity Test.............................20
4.15 Capacitance Measurement.....................21
4.16 Temperature Measurement.....................21
5. Maintenance......................................22
5.1 Replace Battery.........................................22
5.2 Replace Probe..........................................22
6. Accessries..........................................22

01 02
1. Safety Information
The meter meets GB/T 13978-92 digital multimeter
general technology conditions, GB4793.1-1995
(IEC-61010-1, IEC-61010-2-032) electronic
measurement instrument safety requirements with
secondary pollution and over-voltage standard
CATll 1000V.
Please follow the safety operation guidelines to ensure
the safe use
The meter will provide satisfactory service to you if you
use and protect it appropriately.
1.1 Preparation
1.1.1 When using the meter, the user should comply with
standard safety rules:
- General shock protection
- Prevent misusing the meter
After receiving the meter, please check for
damage that may have occurred during the transport.
1.1.3 If the meter has been stored and shipped under
hard conditions, please check and confirm
whether or not the meter is damaged.
1.1.2
1.2 Usage
1.2.1 When using, select the right function and
measuring range.
1.2.2 Don't exceeding indicated values in each
measuring range.
1.2.3 When measuring circuits with the meter
connected, do not touch the probe tip (metal part).
Warning
Please particularly note that inappropriate
use may cause shock or damage to the meter.
In use, users should comply with common
safety procedures and completely follow the
safety measures stated in the operation manual.
In order to make full use of the meter's
functions and ensure safe operation, please
carefully read and follow the procedures in the
operation manual.
1.1.4 Probe should be in good condition. Before use,
please check whether the probe insulation is
damaged, and whether metal wire is bare.
1.1.5 Use the probe table provided with the meter to
ensure safety. If necessary, be replaced with
another identical probe or one with the same
specification.
1.2.4 When measuring, if the voltage to be measured is
more than 60 V DC or 30 V AC (RMS), always keep
your fingers behind the finger protection device.
1.2.5 Do not measure between measuring end and
ground that is more than 600 V.
1.2.6 For manual measuring range, when the value to
be measured is unknown in advance, choose the
highest measuring range first and then lower
ranges in sequence until the correct range is found.
1.2.7 Before rotating selector switch to change
measuring function, remove the probe from the
circuit to be measured.
1.2.8 Don't measure resistors, capacitors, diodes and
circuits connectws to power.
1.2.9 During the test of current, resistors, capacitors,
diodes and circuit connections, be careful to avoid
connecting the meter with the voltage source.
1.2.10 Do not measure capacitance before capacitor is
discharged completely.

03 04
1.3 Symbols
Note (Important safety information. Refer to
the operation manual)
Double insulation protection (class II)
CAT III According to pulse voltage tolerance
protection level provided by IEC 61010-1
standard overvoltage (installation) level III and
pollution degree 2.
The meter complies with EU standard
Grounding
1.4 Maintenance
1.4.1 Don't try to open the meter bottom case to adjust
or repair. Such operations can only be performed
by technicians who fully understand the meter
and electrical shock hazard.
1.4.2 Before opening the meter bottom case or battery
cover, remove probe from the circuit to
be measured.
2. Description
- The meter is a portable, professional measuring
instrument with LCD display and back light for easy
reading by users. Measuring range switch is operated
by single hand for easy operation with overload
protection and low battery indicator. It is an ideal
multifunction meter for professionals, factories,
schools, fans and family use.
- The meter is used to measure AC current, AC voltage,
DC voltage, frequency, duty ratio, resistance,
capacitance measurement, temperature, NCV and
circuit connection, and to make diode tests.
- The meter has an auto measuring range function.
- The meter has a test data dual display function.
- The meter has a reading hold function.
- The meter has a relative test function.
- The meter has max. and min. display function.
- The meter has a manual measuring range selection
function.
- The meter has a back light function.
- The meter has a auto power-off function.
1.4.4 Clean the meter with damp cloth and mild
detergent. Do not use abrasives or solvents.
1.4.5 Power off the meter when the meter is not used.
Switch the measuring range to OFF position.
1.4.6 If the meter is not used for long time, remove the
battery to prevent the meter being damaged.
1.2.11 Do not use the meter in explosive gas, vapor or
dusty environment.
1.2.12 If you find any abnormal phenomena or failure
on the meter, stop using it immediately.
1.2.13 The meter should not be used unless the bottom
case and the battery cover are completely
fastened in their original places.
1.2.14 Don't store or use the meter in direct sunlight,
high temperature or high humidity.
1.4.3 To avoid wrong readings causing electric shock,
when“ ”appears on the meter display,
replace the battery immediately.
Dangerous electric conductor.

05 06
(1) Current clamp head
(2) Clamp head light
(3) Panel
(4) Trigger
(5) Backlight key
(6) Function choice button (FUNC)
(7) Maximum/minimum choice button
(8) LCD display
(9) Common end jack
2.1 Part Name
(10) Input jack
(11) Relative measurement button (REL)
(12) Reading hold (HOLD)
(13) Transfer switch
(14) NCV indicator
1
4
9
11
13
14
12
10
8
7
6
5
3
2
%
kHz
NCV°F
mVA°C
nµmF
MKΩHz
INR
0 10 20 30 40 50 60 66
Z
REL
Temp
NVC
6600
FUNC
MAX
MIN REL HOLD
MS2015B AC CLAMP METER

07 08
2.3 LCD Display
2.2 Switch, Button And Input Jack Description
FUNC button: used for measuring function switch.
button: used for backlight control.
RANGE button: used for switching between automatic
measuring range and manual measuring range.
MAX/MIN button: used for maximum/minimum display
function.
REL button: used for switch to enter relative
measurement state.
HOLD button: used for reading hold.
OFF position: used for shutting off the power.
INPUT jack: voltage, resistance, frequency,
temperature, capacitance, diode, circuit connection
input wire connecting terminal.
COM jack: voltage, resistance, frequency, temperature,
capacitance, diode, circuit connection common wire
connecting terminal.
Transfer switch: used for selecting function and
measuring range.
Clamp head: used for current measurement.
H
AC Alternating Current
Buzzer continuity
Automatic measuring range mode
Maximum measurement state
Minimum measurement state
Relative measurement mode
Automatic power-off state
Low Battery
Reading hold state
Percentage (duty ratio)
Millivolt, Volt (voltage)
Amperes (Current)
Nano farad, Microfarad, Millifarad
Ohm, Kilohm, Megohm (resistance)
Hertz, Kilohertz, Megahertz (frequency)
Hz,kHz,MHz
Ω,kΩ,MΩ
nF,μF,
mV,V
%
AUTO
MAX
MIN
REL
A
DC Direct Current
Diode
%
kHz
NCV°F
mVA°C
nµmF
MKΩHz
INR
0 10 20 30 40 50 60 66
Z
REL

09 10
3. Specifications
3.1.1 Auto measuring range.
3.1.2 Full measuring range overload protection
3.1.3 The maximum allowable voltage between
measurement end and ground: 1000V DC or
750 AC ( no RMS)
3.1.4 Operational height: maximum 2000 m
3.1.5 Display: LCD
3.1.6 Displayed maximum value: digit 6600.
3.1.7 Polarity indication: automatic indication,
'-' means negative polarity.
3.1.8 Exceeding measuring range display: '0L' or '-0L'
3.1.9 Sampling rate: about 3 times/sec., simulation
bar: 30 times/sec.
3.1.10 Unit display: has function and power unit display.
3.1.11 Auto off time: 15 mins
3.1.12 Operating power supply: 9V battery.
3.1.13 Battery undervoltage indication: LCD
displays symbol .
3.1.14 Temperature coefficient: less than
0.1×accuracy/°C
3.1.15 Operational temperature: 18°C ~28°C
3.1.16 Storage temperature: -10°C ~ 50°C
3.1.17 Dimension: 225×86×33mm
3.1.18 Weight: about 320g (include battery)
The meter should be recalibrated under the condition
of 18°C~28°C, relative humidity less than 75% .
3.1 General
3.2 Technical Indicators
Environment temperature: 23±5°C, relative humidity
(RH):<75%
3.2.2 AC Current
Accuracy
Resolution
Measuring
±(2.5% of reading+6 digits)
66A
660A
1000A
0.01A
0.1A
1A
- Maximum input current: 1000A AC
- Frequency range: 40 ~ 100Hz
Temperature
Frequency range: -20°C～1000°C
Accuracy
Resolution
Measuring range
±(2% of reading+2 digits)
1000°C 1°C
3.2.3 DC voltage
Accuracy
Resolution
Measuring range
±(0.7% of reading+2 digits)
660.0mV
6.600V
66.00V
0.1mV
0.001V
0.01V
660.0V
1000V
0.1V
1V
±(0.8% of reading+2 digits)
±(0.8% of reading+2 digits)
- Input impedance: 10MΩ
- Maximum input voltage: 1000V DC

Function Resolution
Measuring range
- Forward DC current is about 1mA
- Backward DC voltage is about 3.3V
- Overload protection: 250V DC or AC (RMS)
0.001V Display approximate diode
forward voltage value
Accuracy
Resolution
Measuring range
±(0.8% of reading + 3 digits)
±(1.2% of reading + 3 digits)
66.00MΩ
660.0Ω
6.600kΩ
66.00kΩ
660.0kΩ
6.600MΩ
0.001kΩ
0.1Ω
0.01kΩ
0.1kΩ
0.001MΩ
0.1MΩ
Accuracy
Resolution
Measuring range
0.001Hz66.00Hz
660.0Hz 0.01Hz
0.01kHz66.00kHz ±(0.5% of reading + 2 digits)
0.001kHz
6.600kHz
660.0kHz
6.600MHz
66.00MHz
0.1kHz
0.001MHz
0.01MHz
11 12
Note:
In the small voltage measuring range, when the probe
is not connected with the circuit to be tested, and the
meter may have fluctuating readings, which is normal
and caused by the meter's high sensitivity. When the
meter is connected with the circuit to be tested, you will
get actual measured value.
3.2.4 AC Voltage
Accuracy
Resolution
Measuring range
±(1.0% of reading + 4 digits)
±(0.8% of reading + 3 digits)
1V
0.1V
0.01V
0.001V6.600V
66.00V
660.0V
750V
- Input impedance: 10MΩ
- Maximum input voltage: 750V AC
- Frequency range: 40 ~ 400Hz
Note:
In the small voltage measuring range, when the probe
is not connected with the circuit to be tested, and the
meter may have fluctuating readings, which is normal
and caused by the meter's high sensitivity. When the
meter is connected with the circuit to be tested, you will
get actual measured value.
3.2.5 Frequency
3.2.6 Resistance
- Open circuit voltage: about 0.4V
- Overload protection: 250V DC or AC (RMS)
3.2.7 Diode test

13 14
Accuracy
Resolution
Measuring range
3.2.8 Circuit Continuity Test
- Overload protection: 250V DC or AC (RMS)
0.1Ω
If the resistance of circuit to
be measured is less than
30Ω, the meter's built-in
buzzer may sound.
3.2.9 Capacitance
Accuracy
Resolution
Measuring range
±(4.0% of reading + 5 digits)
6.600nF
- Overload protection: 250V DC or AC (RMS)
66.00nF
660.0nF
6.600µF
66.00µF
660.0µF
6.600mF
66.00mF
0.001nF
0.01nF
0.1nF
0.001µF
0.01µF
0.1µF
0.001mF
0.01mF
4.1.1 In the process of measurement, if reading hold is
required, press “HOLD” key, the value on the
display will be locked.
4.1.2 Press the “HOLD” key again to cancel reading hold.
4. Operating Guidance
4.1 Reading Hold
4.2 Relative measurement
4.2.1 Relative measurement only can be used to
measure current, voltage, resistance, capacitance
and temperature.
4.2.2 Press the “REL” key to enter relative
measurement mode. The automatic measuring
range will be disabled. Press “REL” key again to
restore automatic measuring range.
Note: When measuring, to use relative measurement,
input corresponding measuring range first through
the probe.
4.3 Manual measuring range choice
Use RANGE key to select automatic or manual
measuring range. The preset selection is automatic
measuring range.
Press to switch to manual measuring range. In the
manual measuring range mode, click once to change to
a higher grade, and click again to change to the top grade.
Continue to press this key to change to the bottom grade.
If this key is pressed more than 2 seconfs, the meter
will switch back to the automatic measuring range.
4.4 Function switch
4.4.1 In the DC current measurement state, press the
“FUNC” key, and the meter will enter AC current
measurement state. Presses “FUNC” key again,
and the meter will enter DC current measurement
state again.
4.4.2 In the resistance grade, press the "FUNC" button
to switch among resistance, diode and
continuity detection.

15
4.5.1 In the process of measurement, if ambient light
is too dark to read, press “ ”key to turn on the
backlight. The backlight will automatically turn off
after about 30 seconds.
4.5.2 During this period, pressing “ ”key will turn off
backlight.
4.5.3 In the current grade, the meter will turn on
backlight and clamp head light.
Backlight is LED with high working current.
If backlight is used often, it will shorten battery
life, so use backlight only when necessary.
Note: When battery voltage <7V, LCD displays “ ”
(low voltage) symbol. But when using the backlight,
the battery voltage will drop due to the high working
current and the“ ”symbol may display. (When the
“ ”symbol shows, accuracy of measurement is not
guaranteed). At this time, don't replace the battery.
Continue to use the meter normally without using the
backlight, and replace the battery only when the “ ”
symbol shows under normal use.
_
4.6 Automatic power-off
4.6.1 If there is no operation during any 15 minute
period after turning the machine on, the meter
will enter a suspended state and automatically
power off to save the battery. Within 1 minute
before shutdown, the buzzer will sound 3 times.
Immediatelyt before shutting down, the buzzer
will make a long sound.
4.6.2 After automatic power-off, press the “FUNC” key
to restore the meter to normal function.
4.6.3 Holding any other key except “FUNC” key and
“HOLD” more than 2 seconds when powering on
will cancel the automatic power-off function.
4.7 Measurement preparation
4.7.1 Turn the transfer switch to turn on the power.
When battery voltage is low (about <7V), LCD
displays “ ”symbol. Replace the battery
immediately.
4.7.2 “ ”symbol means that input voltage or current
should not be more than the indicated value. This
is to protect the internal line from damage.
4.7.3 Place transfer switch to the required measuring
function and range.
4.7.4 When connecting line, please connect the
common test line first, then connect charged test
line. When removing line, remove charged test
line first.
_
4.8 Current Measurement
Electric shock hazard.
Remove the probe from the meter before
measuring with current clamp.
Warning
4.8.1 Place measuring switch in position . At this
time, the meter is in the AC current measurement
state.
4.8.2 Hold the trigger, open clamp head, and clip one
lead of measurement circuit to be tested in the
clamp.
4.8.3 LCD will show readings.
Note:
1) Clamping two or more leads of circuit to be tested
simultaneously will give invalid readings.
2) To get accurate readings, place the lead to be tested
at the center of current clamp.
3)“ ” indicates that maximum input AC current is
1000A and DC current 1000A.
A~
16
4.5 Back light and clamp head light

17 18
4.9 AC voltage measurement
Electric shock hazard.
Pay special attention to avoid shock when
measuring high voltage.
Don't input voltage more than AC600V RMS.
Warning
4.9.1 Insert black probe to the COM jack and insert red
probe to the INPUT jack.
4.9.2 Place transfer switch to AC voltage position.
Press the “FUNC” key to select AC voltage
measurement state.
4.9.3 Connect the probe with voltage source or both
ends of load in parallel for measurement.
4.9.4 LCD will show readings..
V
Note:
1). In the small voltage measuring range, the probe is
not connected with the circuit to be tested, and the
meter may have fluctuating readings, which is normal
and caused by the meter's high sensitivity. When the
meter is connected with the circuit to be tested, you
will get actual measured value.
2). In the relative measurement mode, the automatic
measuring range is disabled.
3) “ ”means that maximum input voltage is 750V AC.
Electric shock hazard.
Pay special attention to avoid shock when
measuring high voltage.
Don't input voltage more than DC1000V RMS.
Warning
4.10.1 Insert black probe to the COM jack and insert
red probe to the INPUT jack.
4.10.2 Place transfer switch to AC voltage position.
Press the “FUNC” key to select AC voltage
measurement state.
4.10.3 Connect the probe with voltage source or both
ends of load in parallel for measurement.
4.10.4 LCD will show readings. Polarity indication
shows the load connected with the red probe.
V
Note:
1) In the small voltage measuring range, the probe is
not connected with the circuit to be tested, and the
meter may have fluctuating readings, which is normal
and caused by the meter's high sensitivity. When the
meter is connected with the circuit to be tested, you
will get actual measured value.
2) In the manual measuring range mode, the LCD only
shows “OL” or “-OL”, which indicates overrange.
Choose a higher measuring range.
3) “ ”means that maximum input voltage is 1000V DC.
4.10 DC voltage measurement

19 20
4.11.3.1 Insert black probe to the COM jack and insert
red probe to the INPUT jack.
4.11.3.2 Place transfer switch in position “HZ”.
4.11.3.3 Connect the probe with signal or both ends of
load in parallel for measurement.
4.11.3.4 LCD will show readings..
4.12 Resistance test
Electric shock hazard.
When measuring circuit impedance, determine
that the power supply is disconnected and the
capacitor in the circuit is completely discharged.
Warning
4.12.1 Insert black probe to the COM jack and insert red
probe to the INPUT jack.
4.12.2 Place measuring range switch in Ω position.
The meter is in the measurement state.
4.12.3 Connect the probe to the both ends of resistor or
circuit to be tested for measurement.
4.12.4 LCD will show readings.
Note:
1) When the input end is open, LCD shows “0L”
out-of-range condition.
2) When the resistance to be tested > 1MΩ, the meter
reading will stabilize after a few seconds, which is
normal for high resistance readings
4.13.4 Connect the red probe to diode anode and
connect the black probe to diode cathode to
make test.
4.13.5 LCD will show readings.
Note:
1) What the meter shows is an approximation of diode
forward voltage drop.
2) If the probe has reverse connection or the probe is
open, the LCD will show “0L”
4.14 Circuit continuity test
Electric shock hazard.
When measuring circuit continuity, determine
that the power supply is disconnected and the
capacitor in the circuit is completely discharged.
Warning
4.14.1 Insert black probe to the COM jack, insert red
probe to the INPUT jack.
4.14.2 Place measuring switch in positionΩ .
4.14.3 Press the “FUNC” key to switch to circuit
continuity measuring state.
4.14.4 Connect the probe to the both ends of circuit to
be tested for measurement.
4.14.5 If the resistance of circuit to be measured is less
than 40Ω , the meter's built-in buzzer may sound.
4.14.6 LCD will show readings.
4.11 Measure frequency
Electric shock hazard.
Pay special attention to avoid shock when
measuring high voltage. Don't input voltage
more than AC 250V RMS.
Warning
4.13 Diode Test
4.13.1 Insert black probe to the COM jack and insert
red probe to the INPUT jack.
4.13.2 Place measuring switch in positionΩ .
4.13.3 Press the “FUNC” key to switch to measuring
state.

21 22
Electric shock hazard.
To avoid electric shock, before measuring
capacitance, discharge capacitance completely.
Warning
4.15.1 Insert black probe to the COM jack, insert red
probe to the INPUT jack.
4.15.2 Place measuring switch in position .
4.15.3 After discharging capacitor completely, connect
the probe to the ends of capacitor to be tested.
4.15.5 LCD will show readings.
Note:
1) When measuring bulk capacitor, stable readings
will take some time.
4.16 Temperature Measurement
4.16.1 Insert the temperature probe into the COM,
INPUT jack.
4.16.2 Place measuring switch in position Temp.
4.16.3 LCD will show readings.
5. Maintenance
5.1 Replace battery
Before opening the meter battery cover, the probe
should be remove d from the circuit to be
measured to avoid electric shock.
Warning
5.1.1 When the battery indicator “ ”appears, replace
the battery immediately.
5.1.2 Unscrew the fastening screw of the meter battery
cover and remove it.
5.1.3 Replace the battery.
Note: Do not reverse the battery polarity.
5.2 Replace probe
When replacing the probe, be replaced with
another identical probe or one with the same
level. The probe should be in good condition,
probe level: 1000V, 10A.
Warning
If the probe is damaged, such as bare metal wire,
replace the probe.
6. Accessories
1) Probe Level: 1000V 10A One pair
2) User Manual 1 pc
3) Battery 9V 1 pc
HYS007028
Note:
If the probe is open or circuits resistance to be tested is
more than 400Ω , the display will show “0L”.
4.15 Capacitance measurement