Mastech MS2109A User manual

MS2109A
User Manual
AC/DC Clamp Meter
V
Ω
Hz%
TEMP
MS2109A
AC/DC CLAMP METER
NCV
SEL
REL Hz%
MAX/MIN
/
60

CONTENTS
1. Safety Information….......................1
1.1 Preparation.......................................1
CONTENTS
1.2 Usage................................................2
1.3 Signs and Labels................................3
1.4 Maintenance......................................4
2. Description….................................4
2.1 Part Name..........................................5
2.2 Switch and Button Description..............7
2.3 LCD Display........................................8
3. Specification…...............................9
3.1 General..............................................9
3.2 Technique Data...................................9
4. Operating guidance.......................15
4.1 Reading Hold....................................15
4.2 Measuring Range Switch....................15
4.3 Frequency/Duty Ratio Switch.............15
4.4 Maximum/Minimum
Measurement Choice....................16
4.5 Function Choice..................................17
4.6 Relative Measurement and
Surge Measurement..........................17
4.7 Back Light and Clamp Head Light..........17
4.8 Automatic Power-Off
4.9 Measurement Preparation....................18
4.10 Current Measurement........................19
4.11 Voltage Measurement........................20
4.12 Frequency and
Duty Ratio Measurement
4.13 Resistance Measurement..................23
4.14 Diode Test
4.15 Circuit Continuity test
4.16 Capacitance Measurement................25
5. Maintenance...................................27
5.1 Replace Battery...................................27
5.2 Replace Probe
6. Accessories....................................27
........................24
........................................24
..................21
............................18
4.17 NCV Measurement............................26
4.18 Temperature Measurement................26
....................................27

01
02
1. Safety Information
1.2 Usage
Please particularly note that inappropriate use
may cause shock or damage to the meter. When
using the meter, comply with common safety
procedures and completely follow the safety
measures in this operation manual.
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 III 600V.
Please follow the safety operation guidelines to ensure
the safe use of meter.
The meter will provide satisfactory service to you if you
use and protect it appropriately.
Warning
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
1.1.2 After receiving the meter, please check for damage
that may have occurred during transportation.
1.1.3 If the meter is stored and shipped under hard
conditions, please confirm that the meter is
undamaged.
1.1.4 Probe should be in good condition. Before use,
please check whether the probe insulation is
damaged, whether metal wire is bare.
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
specification.
1.2.1 When using the meter, select the right function
and measuring range.
1.2.2 Don't measure when exceeding the maximum
value in each measuring range.
1.2.3 When measuring a circuit with the meter
connected, do not touch the 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 the finger protection
device.
1.2.5 Do not measure voltage greater than AC 600V.
1.2.6 In the manual measuring range, when the value
to be measured is not known in advance, choose
the highest measuring range to begin, and then
gradually select lower ranges until the correct
range is identified.
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 resistors, capacitors, diodes and
circuits that are energized.
1.2.9 During the test of current, resistors, capacitors,
diodes and circuit connections, do not allow the
meter to connect with voltage source.

03
04
1.3 Part name
Note (Important safety information. Refer to the
operation manual).
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 grade
2 for pollution.
The meter complies with EU standard
Ground (earth)
1.4 Maintenance
1.4.1 Don't try to open the meter bottom case to adjust or
repair. Such operations only can be made by
qualified 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 and potential electric
shock, when “ ”appears on the meter display,
replace the battery immediately.
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 it is not used. Switch the
transfer switch to OFF position.
1.4.6 If the meter is not used for long time, please take
the battery out to prevent the meter being damaged.
1.2.10 Don't measure capacitance unless the capacitor
is discharged completely.
1.2.11 Don't use the meter in explosive gas, vapor or
dusty environments.
1.2.12 If you find any abnormal condition or failure on
the meter, stop using the meter and have it
serviced by a qualified technician.
1.2.13 Unless the meter bottom case and the battery
cover are completely fastened in their original
places, do not use the meter.
1.2.14 Don't store or use the meter in direct sunlight,
high temperature or high humidity.
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. The meter has
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, DC current,
voltage, DC voltage, frequency, duty ratio, resistance,
capacitance, circuit connections, diodes, non-contact
voltages and temperatures.
- The meter has an auto measuring range function.
- The meter has a reading hold function.
- The meter has a max. measuring function.
- The meter has a min. measuring function.

05
06
(1) Current clamp head: used for current measurement.
(2) NCV indicator
(3) Key
(4) LCD display
(5) Common end jack
(6) Resistance, capacitance, voltage, frequency, diode,
continuity and temperature input jack
(7) Knob
(8) Clamp head center position
(9) NCV sense position
2.1 Part name
- The meter has a clamp head frequency measurement
function.
- The meter has an auto power-off function.
- The meter has a relative measuring function.
1
2
3
4
9
6
7
8
5
V
Ω
Hz%
TEMP
MS2109A
AC/DC CLAMP METER
NCV
SEL
REL Hz%
MAX/MIN
/
60

07
08
2.2 Switch, Button and Input Jack Description
B.L/HOLD button: used for reading hold or
back light control
MAX/MIN button: used for maximum/minimum
measurement function switch.
SEL button: used for measuring function switch.
NCV button: Non-contact voltage detection switch.
REL button: used for entering relative measurement state.
Hz/% button: used for frequency and duty ratio
measurement function switch.
OFF position: used for shutting off the power.
INPUT jack: voltage, resistance, frequency, duty ratio,
capacitance, diode, circuit connection,
temperature measurement input wire
connecting terminal.
COM jack: voltage, resistance, frequency, duty ratio,
capacitance, diode, circuit connection,
temperature measurement common wire
connecting terminal.
Transfer switch: used for selecting function and
measuring range.
2.3 LCD Display
ALTERNATING CURRENT, direct current
Diode, continuity
Automatic measuring range mode
Maximum measurement state
AUTO
Minimum measurement state
Relative measurement mode
MAX
MIN
Automatic power-off state
REL
LOW BATTERY
Reading hold state
Percentage (duty ratio)
%
Millivolt, Volt (voltage)
mV, V
AAmperes (Current)
nF, μF Nanofarad, Microfarad
Ohm, Kilohm, Megohm (resistance)
Ω,kΩ, MΩ
H
Hz,kHz,MHZ Hertz, Kilohertz, Megahertz (frequency)
Celsius degree, Fahrenheit degree
(temperature)
°C,°F

09
10
3. Specifications
At least once a year, the meter should be recalibrated
in temperatures of 18°C ～ 28°C and relative humidity
less than 75%.
3.1 General
Auto measuring range.
Full measuring range overload protection.
The maximum allowable voltage between measurement
end and ground: 600V DC or 600V AC
Operational height: maximum 2000m
Display: LCD
Displayed maximum value: 5999 digit.
Polarity indication: automatic indication, '-' means
negative polarity.
Exceeding measuring range display: '0L' or '-0L'.
Sampling rate: about 3 times/s, simulation bar 30 times/s.
Unit display: has function and power unit display.
Auto off time: 15 min
Power supply: 1.5V 3AAA battery.
Battery undervoltage indication: LCD displays symbol.
Temperature coefficient: less than 0.1x accuracy°C
Operating temperature: 18°C~28°C.
Storage temperature: -10°C~50°C
Dimension: 220×81×41mm
Weight: about 286g (include battery)
3.2 Technical Indicators
Environment temperature: 23±5°C, relative humidity
(RH): <75%
3.2.1 AC Current
Measuring
range Resolution Accuracy
±(2.5% of reading + 6 digits)
60A
600A
0.01A
0.1A
- Maximum input current: 600A AC
- Frequency range: 40~400Hz
3.2.3 DC Voltage
600mV
0.01V
0.1V
±(0.7% of reading + 2digits)
6V
60V
600V
0.1mV
0.001V
- Input impedance: 10MΩ
- Maximum input voltage: 600V AC (RMS) or 600V DC
3.2.2 DC Current
±(3.0% of reading + 6 digits)
60A
600A
0.01A
0.1A
- Maximum input current: 600A DC
Measuring
range Resolution Accuracy
Measuring
range Resolution Accuracy

11
12
3.2.4 AC Voltage
0.01V
0.1V
±(0.8% of reading + 3 digits)
6V
60V
600V
600V
0.001V
1V ±(1.0% of reading + 4 digits)
- Measuring scope: 40Hz ~ 10kHz
- The input voltage range: > 600mV AC (RMS) (input
voltage will increase when the frequency to be
measured increases)
- Input impedance: 10MΩ
- Maximum input voltage: 600V AC (RMS)
- Input impedance: 10MΩ
- Maximum input voltage: 600V AC (RMS) or 600V DC
- Frequency range: 40 ~ 400Hz
3.2.5 Frequency
3.2.5.1Clamp head measuring frequency
(through grade A):
± (1.5% of reading + 5 digits)
99.99Hz
999.9Hz 0.1KHz
0.01KHz
- Measuring scope: 40Hz ~ 1kHz
- The input signal range: > 6A AC (RMS) (input current
will increase when the frequency to be measured
increases)
- Maximum input current: AC 600A (RMS)
3.2.5.3 Through grade HZ/DUTY:
9.999Hz
±(0.5% of reading + 3 digits)
99.99Hz
0.001KHz
0.01Hz
0.001Hz
0.1Hz999.9Hz
9.999KHz
99.99KHz
999.9KHz
9.999MHz 0.001MHz
0.1KHz
0.01KHz
- Overload protection: 250V DC or AC (RMS)
- The input voltage range: > 2V (input voltage will
increase when the frequency to be measured
increases)
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. This is normal and
caused by the meter's high sensitivity. It does not
affect actual measurement results.
Measuring
range Resolution Accuracy
Measuring
range Resolution Accuracy
± (1.5% of reading + 5 digits)
99.99Hz
999.9Hz 0.1Hz
0.01Hz
Measuring
range Resolution Accuracy
9.999kHz 0.001KHz
3.2.5.2 Through grade V:
Measuring
range Resolution Accuracy

13
14
Resolution Accuracy
600Ω
6kΩ
0.1kΩ
0.001kΩ
0.1Ω
0.01kΩ
0.1MΩ
0.001MΩ
Function
0.001V
If the resistance of circuit to be
measured is less than 70Ω, the
meter's built-in buzzer may sound.
3.2.6.2 Through grade V:
- Frequency response: 40 ~ 10kHz
- Input voltage range: > 600mV AC
- Input impedance: 10MΩ
- Maximum input voltage: 600V AC (RMS)
3.2.6.2 Through grade HZ/DUTY:
- Frequency response: 1 ~ 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)
3.2.7 Resistance
60kΩ
600kΩ
6MΩ
60MΩ±(1.2% of reading + 3 digits)
- Open circuit voltage: about 0.4V
- Overload protection: 250V DC or AC (RMS)
3.2.8 Circuit Continuity Test
- Overload protection: 250V DC or AC (RMS)
0.1Ω
Display approximate diode
forward voltage value
3.2.10 Diode Test
- Forward DC current is about 1mA
- Backward DC voltage is about 3.3V
- Overload protection: 250V DC or AC (RMS)
Accuracy
40nF
±(4.0% of reading + 5 digits)
0.01μF
0.1nF
0.01nF
0.001μF
0.001mF
0.1μF
3.2.9 Capacitance
4μF
- Overload protection: 250V DC or AC (RMS)
400nF
40μF
400μF
4000μF
3.2.6.1Through grade A (from clamp head):
- Frequency response: 40 ~ 1kHz
- Input current range: >6A AC (RMS)
- Maximum input current: AC 600A
3.2.6 Duty Ratio
Measuring range Resolution Accuracy
0.1%-99.9% 0.1% ±(3%+5)
Measuring range
±(0.8% of reading + 3 digits)
Measuring
range Resolution
Measuring
range Resolution
Measuring
range Resolution Function

15
16
4. Operating Guidance
1) In the process of measurement, if reading hold is
required, press “HOLD/B.L” key. The display value
in the display will be locked. Press “HOLD/B.L”
key again to release reading hold.
4.1 Reading Hold
4.2 NCV Key
NCV key is used for non-contact voltage detection.
Press this key and hold it. Place the NCV sensor
zone close the conductor to be detected. It voltage
is more than AC 90V, NCV indicator will flash and
the buzzer will sound at regular intervals.
4.3 Frequency/Duty Ratio Switch
1) When the meter is in AC voltage, AC current position,
if “Hz/%” button is pressed, the meter will measure
AC voltage and AC current signal frequency. Click
“Hz/%” button again, and the meter will measure
voltage and current signal duty ratio. If it is in
HZ/DUTY position, pressing HZ % key will switch
between HZ and DUTY.
4.4 Maximum/Minimum Measurement Choice
1) Press “MAX/MIN” key to enter MAX mode, and
always store measurement maximum value. Press
“MAX/MIN” key again, and the meter will enter
minimum value measurement state. Press
“MAX/MIN” key for the third time, and the meter
will display the difference of maximum and minimum
value. Press “MAX/MIN” key to cycle through the
above operations.
2) After entering MAX or MIN mode, the meter will
automatically save the measured maximum or
minimum value.
3) If the user presses “MAX/MIN” key more than 2 sec,
the meter will restore normal measuring range.
1) When the meter is in the maximum/minimum value
measurement state, it is manual measuring range
mode.
2) When the meter is in the frequency, duty ratio
measurement state, it can't be switched to
maximum/minimum value measurement mode.
3) When the meter is in the maximum/minimum value
measurement state, SEL, REL key is invalid.
Note:
3.2.11 Temperature
Measuring
range Resolution Accuracy
-20°C~0°C ±(3.0% of reading + +4 digits)
1°C~400°C
401°C~1000°C
1°C ±(1.0% of reading + +3 digits)
±2.0% of reading
Note:
When the meter is in the maximum/minimum value
measurement state, it can't be switched to frequency,
duty ratio measurement mode.
2) If “Hz/%” button is pressed again, the meter will
revert to voltage, current measurement state.
- Temperature indicator does not include thermocouple error.
- Overload protection: 250V DC or AC (RMS)