Mastech MS2115A User manual

MS2115A
Digital Clamp Meter
Operation Manual

CONTENTS CONTENTS
1. Safety Information.............................1
1.1 Preliminary...............................................1
1.2 Usage.......................................................2
1.3 Mark.........................................................3
1.4 Maintenance............................................3
2. Description........................................4
2.1 Part Name................................................5
2.2 Switch and Button Description..................7
2.3 LCD Display.............................................7
3. Specifications...................................9
3.1 General ...................................................9
3.2 Technique Data.......................................10
4. Operating Guidance.........................16
4.1 Reading Hold..........................................16
4.2 Measuring Range Switch.........................17
4.3 Frequency/Duty Ratio Switch...................17
4.4 Maximum/Minimum
Measurement Choice..........................18
4.5 Function Choice.......................................18
4.6 Relative Measurement
And Surge Measurement.......................19
4.7 Back Light And Clamp Head Light.............19
4.8 Automatic Power-Off ...............................20
4.9 Measurement Preparation........................20
4.10 Current Measurement.............................21
4.11 Voltage Measurement.............................22
4.12 Frequency And Duty
Ratio Measurement..............................23
4.13 Resistance Measurement.......................25
4.14 Diode Test..............................................26
4.15 Circuit Continuity Test.............................26
4.16 Capacitance Measurement.....................27
4.17 Surge Measurement...............................28
5. Maintenance......................................29
5.1 Replace Battery.........................................29
5.2 Replace Probe..........................................30
6. Attachments.......................................30
4.18 NCV Measurement.................................29

01 02
1. Safety Information
Please particularly note that inappropriate use may cause
shock or damage to the meter when using. When using the
meter, 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.
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 of CAT IV 600V
and CAT III 1000V.
Please follow the safety guidelines to ensure safe
usage of the meter. The meter will provide satisfactory
services to you if you use and protect it appropriately.
Warning
1.1 Preliminary
1.1.1 When using the meter, the user should comply with
standard safety rules:
- General shock protection
- Prevent misusing the meter
1.1.2 Please check for damage during transportation
after receiving the meter.
1.1.3 If the meter is stored and shipped under hard
conditions, please confirm if the meter is damaged.
1.1.4 Probe should be in good condition. Before use,
please check whether the probe insulation is
damaged and if the metal wire is bare.
1.2 Usage
1.2.1 When using, select the right function and
measuring range.
1.2.2 Don't measure by exceeding indication value
stated in each measuring range.
1.2.3 When measuring a circuit with the meter
connected, do not contact with probe tip
(metal part).
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 finger protection device
1.2.5 Do not measure voltage greater than AC 750V.
1.2.6 In the manual measuring range mode, when
measuring an unknown value, select the highest
measuring range first.
1.2.7 Before rotating conversion switch to change
measuring function, remove probe from the circuit
to be measured.
1.2.8 Don't measure resistor, capacitor, diode and
circuit connected to power.
1.2.9 During the test of currents, resistors, capacitors,
diodes and circuit connections, be careful to avoid
connecting the meter to a voltage source.
1.2.10 Do not measure capacitance before capacitor is
discharged completely.
1.2.11 Do not use the meter in explosive gas, vapor or
dusty environments.
1.2.12 If you find any abnormal phenomena or failure
on the meter, stop using the meter.
1.1.5 Use the probe table provided with the meter to
ensure safety. If necessary, replace the probe
with another identical probe or one with the same
level of performance.

03 04
1.3 Mark
Note (Important safety information. Refer to
the operation manual)
Can be used for dangerous electric conductor.
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.
1.4.3 To avoid wrong readings causing electric shock,
when " " appears on the meter display, replace
the battery immediately.
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 for AC current, DC current, voltage,
DC voltage, frequency, duty ratio, resistance,
capacitance measurement, circuit connection, diode
test and non-contact voltage detection.
- The meter has automatic measuring range and manual
measuring range.
- The meter has reading hold function.
- The meter has max. measuring function.
- The meter has min. measuring function.
- The meter has clamp head frequency measurement
function.
- The meter has auto power-off function.
- The meter has relative measuring function.
1.2.13 Unless the meter bottom case and the battery
cover are completely fastened completely, do
not use the meter.
1.2.14 Don't store or use the meter in the conditions
of direct sunlight, high temperature and high
humidity.
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.

05 06
(1) Current clamp head: used for current measurement.
(2) Clamp head light
(3) Panel
(4) Trigger
(5) Function choice button (FUNC)
(6) Relative measurement button
(7) Frequency/duty ratio switch button (Hz/%)
(8) LCD display
(9) Common end jack
(10) Resistance, capacitance, voltage, frequency,
diode and continuity input jack
(11) Maximum/minimum choice button (MAX/MIN)
(12) Reading hold/Back light button (B.L/ HOLD)
(13) Transfer switch
(14) NCV indicator
2.1 Part Name
10
12
11
13
14
1
2
3
4
8
9
5
6
7

07 08
2.3 LCD Display
AC, DC ALTERNATING CURRENT, direct current
Diode, 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,mF
mV,V
%
AUTO
MAX
MIN
REL
A
H
2.2 Switch, Button And Input Jack Description
B.L/HOLD button: used for reading hold or back
light control
FUNC button: used for measuring function switch.
RANGE button: used for switching manual measuring
range state.
REL button: used for entering relative measurement
state.
Hz/% button: used for frequency and duty ratio
measurement function switch.
MAX/MIN button: used for maximum/minimum
measurement function switch.
OFF position: used for shutting off the power.
INPUT jack: voltage, resistance, frequency, duty
ratio, capacitance, diode, circuit connection input
wire connecting terminal.
COM jack: voltage, resistance, frequency, duty ratio,
capacitance, diode, circuit connection common wire
connecting terminal.
Transfer switch: used for selecting function and
measuring range.
Non-contact voltage detection
NCV

09 10
3. Specifications
Automatic measuring range and manual measuring
range.
Full measuring range overload protection.
The maximum allowable voltage between
measurement end and ground: 1000V DC or 750V AC
Operational height: maximum 2000m
Display: LCD
Displayed maximum value: 5999 digit.
Polarity indication: automatical indication, '-' means
negative polarity.
Exceeding measuring range display: '0L' or '-0L'.
Sampling rate: about 3 times/sec.
Unit display: has function and power unit display.
Auto off time: 15 min
Power supply: DC power 9V
Battery type: NEDA 1604, 6F22
Battery undervoltage indication: LCD displays
symbol.
Temperature coefficient: less than 0.1×accuracy/
Operational temperature: 18 ~28
Storage temperature: -10 50
Dimension: 238×92×50mm
Weight: about 420g (include battery)
°C
°C °C
°C~°C
The meter should be recalibrated under the condition
of 18°C~28°C, relative humidity less than 75% with
the period of one year.
3.1 General
3.2 Technical Indicators
Environment temperature: 23±5°C, relative humidity
(RH):<75%
3.2.1 True RMS Zero Input Characteristic
3.2.1.1 For measuring non-sinusoidal wave signal,
uses true RMS measuring method, which has
less error than traditional average response
measuring method.
3.2.1.2 The true RMS meter can accurately measure
non-sinusoidal wave signal, but if it is in AC
function mode, when there is no signal to be
measured (input terminal short circuit in AC
voltage mode), clamp meter may show a
reading from 1 to 50. These deviating readings
are normal. In the designated measurement
range, they will not affect the accuracy for
multimeter measuring AC.
3.2.1.3 The true RMS can be measured only when input
signal reaches a certain level. Therefore, the
measuring range of AC voltage and current
should be specified at 2% ~ 100% of full range.
3.2.2 AC Current
Accuracy
Resolution
Measuring range
±(2.0% reading + 8 digits)
60A
600A
1000A
0.01A
0.1A
1A
- Maximum input current: 1000A AC
- Maximum input current: 0~600A: 40~400Hz;
600A~1000A: 40~60Hz

11 12
3.2.3 DC Current
Accuracy
Resolution
Measuring range
±(2.0% reading + 8 digits)
60A
600A
1000A
0.01A
0.1A
1A
- Maximum input current: 1000A DC
3.2.4 Surge Current
Accuracy
Resolution
Measuring range
±(5% reading + 60 digits)
60A
600A
1000A
0.01A
0.1A
1A
< 60A for reference only
Time of integration: 100ms; measurement range:
20~1000A; frequency range: 40~400Hz
3.2.5 DC Voltage
Accuracy
Resolution
Measuring range
±(0.8% reading + 4 digits)
1V
±(0.5% reading + 5 digits)
0.1V
0.01V
0.001V
0.1mV
0.01mV60mV
600mV
6V
60V
600V
1000V
- Input impedance: 10MΩ
- Maximum input voltage: 750V AC (RMS) or 1000V DC
Note:
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. This does not
affect actual measurement results.
3.2.6 AC Voltage
Accuracy
Resolution
Measuring range
±(0.8% reading + 4 digits)
1V
±(0.6% reading + 5 digits)
0.1V
0.01V
0.001V
0.1mV
0.01mV60mV
600mV
6V
60V
600V
750V
- Input impedance: 10MΩ
- Maximum input voltage: 750V AC (RMS) or 1000V DC
- Frequency range: 40 ~ 400Hz
Note:
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. This does not
affect actual measurement results.

13 14
3.2.7 Frequency
Accuracy
Resolution
Measuring range
0.01Hz
99.99Hz
- Measuring scope: 10Hz~1kHz
- The input signal range: >20A AC (RMS) (input
current will increase when the frequency to be
measured increases)
- Maximum input current: 1000A (RMS)
3.2.7.1 Clamp head measuring frequency
(through mode A):
±(1.5% reading + 5 digits)
999.9Hz 0.1Hz
3.2.7.2 Through mode V:
Accuracy
Resolution
Measuring range
0.01Hz
99.99Hz
±(1.5% reading + 5 digits)
999.9Hz 0.1Hz
0.001kHz9.999kHz
- Measuring scope: 10Hz ~ 10kHz
- The input voltage range: >20mV AC (RMS) (input
voltage will increase when the frequency to be
measured increases)
- Input impedance: 10MΩ
- Maximum input voltage: 750V AC (RMS)
3.2.7.3 Through mode HZ/DUTY:
Accuracy
Resolution
Measuring range
0.001Hz9.999Hz
99.99Hz 0.01Hz
0.001kHz9.999kHz ±(0.3% reading + 5 digits)
0.1Hz999.9Hz
99.99kHz
999.9kHz
9.999MHz
0.01kHz
0.1kHz
0.001MHz
- Overload protection: 250V DC or AC (RMS)
- The input voltage range: > 2V (input voltage will
increase when the frequency to be measured increases)
3.2.8 Duty Ratio
Accuracy
Resolution
Measuring range
0.1-99.9% ±3.0% 0.1%
3.2.8.1 Through mode A (from clamp head):
- Frequency response: 10~1kHz
- Input current range: > 20A AC (RMS)
- Maximum input current: AC 1000A
3.2.8.2 Through mode V:
- Frequency response: 10~10kHz
- Input voltage range: > 60mV AC
- Input impedance: 10MΩ
- Maximum input voltage: 750V AC (RMS)
3.2.8.2 Through mode HZ/DUTY:
- Frequency response: 10 ~ 10MHz
- The input voltage range: > 2V AC (RMS) (input
voltage will increase when the frequency to be
measured increases)
- Maximum input voltage: 250V AC (RMS)

15 16
Accuracy
Resolution
Measuring range
±(0.8% reading + 3 digits)
3.2.9 Resistance
±(1.2% reading + 3 digits)
60MΩ
600Ω
6kΩ
60kΩ
600kΩ
6MΩ
0.001kΩ
0.1Ω
0.01kΩ
0.1kΩ
0.001MΩ
0.1MΩ
- Open circuit voltage: about 0.4V
- Overload protection: 250V DC or AC (RMS)
Accuracy
Resolution
Measuring range
3.2.10 Circuit Continuity Test
- Overload protection: 250V DC or AC (RMS)
0.1Ω
If the resistance of circuit to
be measured is less than
50Ω, the meter's built-in
buzzer may sound.
3.2.11 Capacitance
Accuracy
Resolution
Measuring range
±(3.0% reading + 5 digits)
9.999nF
- Overload protection: 250V DC or AC (RMS)
99.99nF
999.9nF
9.999µF
99.99µF
999.9µF
9.999mF
99.99mF
0.001nF
0.01nF
0.1nF
0.001µF
0.01µF
0.1µF
0.001mF
0.01mF
3.2.12 Diode Test
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
1) In the process of measurement, if reading hold is
required, press “HOLD/B.L” key, the value on the
display will be locked. Press “HOLD/B.L” key again
to cancel reading hold state.
4. Operating Guidance
4.1 Reading Hold