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MS8232B
Digital Multimeter
User's Manual
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MS8232B
DIGITAL MULTIMETER
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CONTENTSCONTENTS
1. Introduction..................................1
2. Safety Information.........................2
3. Product Overview..........................3
3-1. Product External View
and Specifications..............................3
3-2. Function Keys.....................................4
3-3. Symbols.............................................4
4. Technical Index..............................4
4-1. General Characteristics.......................4
4-2. Electrical Technical Index....................5
5. Measuring Operations...................8
5-1. DC Voltage and AC
Voltage Measurement.........................8
5-2. Resistance Measurement....................9
5-3. Diode Test.........................................10
5-4. Continuity Measurement....................10
5-5. Capacitance Measurement.................11
5-6. Frequency Measurement...................12
5-7. Duty Cycle Measurement...................12
5-8. DC Current and AC
Current Measurement......................13
5-9. Non-contact AC
Voltage Induction Detection..............14
6. Maintenance...............................15
6-1. Battery Replacement .......................15
6-2. Fuse Replacement...........................15
6-3. Cleaning.........................................15
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1. Introduction
The digital multimeter is designed and manufactured
according to safety requirements of EN61010-1 on
electronic measuring instrument and hand-held digital
multipurpose meter. The product meets with the
requirements of EN61010-1 600V CAT III and pollution
degree 2.
The meter can be used for measuring DC voltage, AC
voltage, resistance, diode, buzzer, Continuity test,
capacitance, frequency, DC current, AC current and
duty cycle etc. The unique non-contact AC voltage
detection function can promptly remind you to pay
attention to safety operation, the full scale AC220V
protection design makes you more safe and relieved.
This series of meters can be
widely used for schools, labs, research institutes,
enterprises and factories etc. various electronic
industries.
Please read this operating instruction carefully and
pay attention to related safe working standards before
using this meter, Protection provided by the instrument
will be impaired if used in a manner not specified by
the manufacturer.
020102
2. Safety Information
The special attention should be paid when using the
meter because the improper usage may cause electric
shock and damage the meter. The safety measures in
common safety regulations and operating instruction
should be complied with when using. In order to make
fully use of its functions and ensure safe operations,
please comply with the usage in this section carefully.
Warning
In order to avoid personal injury and meter damage
caused by electric shock, the following safety tips should
be paid attention to:
• Don't measure any voltage out of stipulated measuring
range of the meter.
Don't apply high voltage (above 100V) at input end
when measuring resistance and diode.
Don't use the meter if the test line is damaged or
exposed metal part.
Avoid using under direct sunlight or high temperature.
Pay attention to the possibility of electric shock when
measuring voltage in excess of 36V AC or 48C DC.
Before measuring current, firstly turn off the power of
measured equipment and measured circuit, Electrify
to measure after connecting test leads.
Pay attention to battery polarity when changing battery.
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Switching key between frequency and duty
cycle, it is used for switching Hz and % at
voltage range and current range.
Flashlight key, press this key to lighten the
LED lamp on the meter which is convenient
to use this meter at dark place.
FUN C
3-3. Symbols
AC (Alternating
Current)
DC (Direct
Current)
Fuse
Double Insulation
Caution, risk of danger(see manual)
Function Switching Key, The voltage current
range is used for switching AC/DC mode,
the resistance range is used for switching
Ω mode.
AC
DC
4. Technical Index
4-1. General Characteristics
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Automatic measuring range is DMM, full range is 3999
counting.
Display: 3 3/4 digits LCD display.
Overload protection: full range protection.
Data hold function.
Relative value measurement.
Low voltage display.
Over range display (“OL”)
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3-2. Function Keys
Conforms to European Union directives
3. Product Overview
Appearance Specifications
1.Flashlight
2.Non-contact AC Voltage Indicator Light
3.LCD Display
4.Function Selection Key
5.Flashlight Key
6.Battery Cover
7.Select Switch
8.Hz/% Switching Key
3-1Product External View
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MS8232B
DIGITAL MULTIMETER
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4.2.1 DC Voltage
Measuring Range
Resolution
Accuracy
±(0.5% rdg + 3dgt)
±(0.8% rdg + 5dgt)
0.1mV
1mV
10mV
100mV
1v
400mV
4V
40V
400V
600V
Input Impedance: 10MΩ
Max. Input Voltage: 600V DC
4.2.2 AC Voltage
Measuring Range
Resolution
Accuracy
±(0.8% rdg + 3dgt)
±(1.0% rdg + 5dgt)
1mV
10mV
100mV
1v
4V
40V
400V
600V
Input Impedance: 10MΩ
Max. Input Voltage: 600V AC
Frequency Range: 40~400Hz
• Automatic power off.
• Working temperature and humidity: 0~40°C
(32~104°F);relative humidity <80%RH
• Storage temperature and humidity: -10~50°C
(14~122°F);relative humidity <70%RH
• Altitude < 2000m
• Power Supply: AAA 2*1.5V Battery
• Safety Class: EN61010-1, CAT III 600V
• Dimension (LxWxH): 110X58X33mm,Weight:
about 150g
(Ambient Temperature: 23±5°C Relative Humidity: <75%)
4-2. Electrical Technical Index
4.2.4 Diode, Continuity
Measuring Range
Function
Display forward voltage drop
of diode
The buzzer makes a sound when
the resistance is less than 50±20.Ω
Open Circuit Voltage: diode is about 1.5V, buzzer is
about 0.5V.
Overload Protection: 250V DC or AC (r.m.s.)
4.2.5 DC Current
Measuring Range
Resolution
Accuracy
400uA
4mA
40mA
400mA
0.1uA
1uA
10uA
100uA
±(1.8% rdg + 5dgt)
Max. Current: 400mA
Overload Protection: mA measuring range:
F500mA/250V fuse
4.2.3 Resistance
Measuring Range
Resolution
Accuracy
±(1.0% rdg + 3dgt)
±(1.2% rdg + 15dgt)
0.1Ω
1Ω
10Ω
100Ω
1KΩ
400Ω
4KΩ
40KΩ
400KΩ
4MΩ
10KΩ40MΩ
Open Circuit Voltage: about 0.25V.
Overload Protection: 250V DC or AC (r.m.s.)
Response: average value response (r.m.s. of sine wave)
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Warning
5. Measuring Operations
5-1 AC Voltage and DC Voltage Measurement
1. Don't allow to measure any voltage in excess of 600V
r.m.s. DC or AC in case of electric shock or meter
damage.
2. Don't allow to apply any voltage in excess of 600V
r.m.s. DC or AC between meter and earth in case of
electric shock or meter damage.
3. Don't measure AC/DC voltages if a motor on the
circuit is being switched ON or OFF. Large voltage
surges may occur that can damage meter.
The voltage ranges of the meter are:
DC Voltage: 400.0mV, 4.000V, 40.00V, 400.0V, 600V;
AC Voltage: 4.000V, 40.00V, 400.0V, 600.0V.
The method of measuring voltage is:
1. Turn rotary switch to position.
2. Press key and select AC or DC measuring range.
3. Apply the two ends of test leads to measure the
voltage value of circuit under test. (Paralleled with
circuit under test)
4. Read measured voltage value with LCD. When
measuring DC voltage, the display shall display the
voltage polarity connected with red test leads at the
same time.
Notice:
At DC200mV and AC 2V ranges and under non-input,
the meter shall have several readings because of
outside interference, but its normal usage and
measuring accuracy will not be affected.
07
4.2.7 Capacitance
Measuring Range
Resolution
Accuracy
4nF
0.001nF
0.01nF
0.1nF
1nF
±(5.0% rdg +0.6nF)
40nF
400nF
4nF
40nF
100uF
10nF
100nF
±(5.0% rdg +30dgt)
±(3.0% rdg +15dgt)
±(5.0% rdg +25dgt)
Overload Protection: 250V DC or AC (r.m.s.)
4.2.8 Frequency
Measuring RangeAccuracy
1Hz-5MHz
±(1.5% rdg +15dgt)
4.2.9 Duty Cycle
Measuring RangeAccuracy
0.5-99.9%
±(2.0% rdg +5dgt)
4.2.6 AC Current
Measuring Range
Resolution
Accuracy
400uA
4mA
40mA
400mA
0.1uA
1uA
10uA
100uA
±(2.0% rdg + 8dgt)
Max. Current: 400mA
Overload Protection: mA measuring range:
F500mA/250V fuse Frequency Range: 40~400Hz
Response: Average value (r.m.s. of sine wave)
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5-2 Resistance Measurement
Warning
In order to avoid the meter or measured equipment
from being damaged, cut off all power supply of
measured circuits and discharge all high voltage
capacitors before measuring capacitance.
The resistance ranges of the meter are:
400.0Ω,4.000kΩ,40.00 kΩ,400.0 kΩ,4.000MΩ,
40.00 MΩ.
The method of measuring resistance is:
1. Turn rotary switch to position.
2. Press key and select measuring range.
3. Apply the two ends of test leads to measure the
resistance value of circuit under test.
4. Read measured resistance value with LCD.
Notice:
1. The no-line measured resistance value shall be
different from rated resistance value, because other
elements on
circuit are connected with measured resistance,
which is equivalent to parallel connection of two or
multi resistances.
2. When measuring low resistance, for the
measurement accuracy, please firstly make two test
leads short circuit, here read out the displayed
resistance value, minus this
displayed value from the correct counting of
measured resistance.
3. When measuring at high resistance range, the
reading can be confirmed after several seconds.
4. Under open circuit, if the meter displays “OL”, it will
show that the measured value exceeds range.
Ω
Ω
1. Turn rotary switch to position, press key and
select measuring range.
2. Separately connect two ends of test leads to the two
ends of measured part and circuit.
5-3 Diode Measurement
Warning
In order to avoid the meter or measured equipment from
being damaged, cut off all power supply of measured
circuits and discharge all high voltage capacitors before
measuring diode.
The method of measuring diode is:
1. Turn rotary switch to position.
2. Press key and select measuring range.
3. Separately connect black and red test leads to
negative pole and positive pole of measured diode.
4. The meter shall display forward bias value of
measured diode. If the poles of the test leads are
connected inversely, the meter will display “OL”.
Ω
Notice:
For on-line measuring diode, display forward voltage
drop at forward measurement; the reverse measurement
depends on the values of other elements connected in
parallel at both ends of diode.
5-4 Continuity Measurement
Warning
In order to avoid the meter or measured equipment from
being damaged, cut off all power supply of measured
circuits and discharge all high voltage capacitors before
on/off measurement.
The method of on/off measurement is:
Ω
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3. The meter shall display the approximate resistance
value between measured points. Here if the
resistance value between measured points is less
than 50±20Ω,the buzzer will make a sound.
5-5 Capacitance Measurement
Warning
In order to avoid the meter or measured equipment from
being damaged, cut off all power supply of measured
circuits and discharge all capacitors before on/off
measurement.
The method of on/off measurement is:
The capacitance ranges of the meter are:
4.000nF, 40.00nF, 400.0nF, 4.000uF, 40.00uF, 100.0uF.
The method of measuring capacitance is:
1. Turn rotary switch to position, press key and
select measuring range.
2. Apply the two ends of test leads to measure the two
pins of the capacitance under test and read
measured value from LCD.
Ω
Notice:
1. The meter shall take some time to stabilize the
reading when measuring high capacitance.
2. The small capacitance with less than 10nF shall
minus the distribution capacitance of the meter and
lead (namely displayed base number) when
measuring.
The method of measuring frequency is:
1. Turn rotary switch to position.
2. Press key and select Hz range.
3. Apply the two ends of test leads to measure the
frequency value of the circuit under test.
5-6 Frequency Measurement
4. Read frequency value from LCD.
5-7 Duty Cycle Measurement
The method of measuring duty cycle is:
1. Turn rotary switch to position.
2. Press key and select % range.
3. Apply the two ends of test leads to measure the
duty cycle value of the circuit under test.
4. Read frequency value from LCD.
V
Hz%
Hz%
V
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Hz%
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lower voltage), connect red test pen to the other end
of disconnected circuit under test (with higher voltage).
4. Switch on the power of the circuit, and then read out
displayed reading. If the display only displays “OL”,
it will show that the input exceeds selected range,
and the rotary switch shall be placed at higher range.
5. Cut off the power of measured circuit. Discharge all
capacitances, take off the test pen and recover the
circuit.
Notice:
1. The measuring current of the meter shall be
connected in series, not connected in parallel to
avoid from damaging the meter or endangering
personal safety.
2. When measuring DC current, if the test pen is
reversely connected to the circuit, the display will
change into negative, but not affect measuring
accuracy.
5-9 Non-contact AC Voltage Induction Detection
Warning
Before measuring hazardous voltages, first check the
voltage indicated to determine if the equipment can
operate correctly.
The function may occur wrong warning because of
different outside interferences.
The measured result is for reference only when using.
Make the top of the meter close to measured circuit, if
more than AC110V voltage exists in the circuit, the
110V indicator light will be lightened because of meter
induction. If more than AC220V voltage exists in the
circuit, the 110V and 220V indicator lights will be
lightened at the same time because of meter induction.
5-8 Current Measurement
Warning
In order to avoid the meter or measured equipment from
being damaged, firstly check the fuse of the meter
before measuring current.
When measuring, please use correct input socket,
function shift and measuring range.
Don't try to measure current when the open circuit
voltage exceeds 250V.
The DC current range:
400uA, 4.000mA, 40.00mA, 400.0mA
The AC current range:
400uA, 4.000mA, 40.00mA, 400.0mA
The method of measuring current is:
1. Cut off the power of measured circuit. Discharge all
high voltage capacitance on measured circuit.
2. Turn rotary switch to mA or uA position.
When the measured current is less than 400uA, select
u A position.
When the measured current is 4mA~400mA, select
mA position.
3. Disconnect the circuit under test. Connect black test
pen to the end of disconnected circuit under test (with
Notice:
1. Even if there is no indication, the voltage still may
exist.
Don't rely on non-contact voltage detector to judge
if the lead exists voltage.
2. The detection operation may be affected by different
socket design, insulation thickness and types.
3. When inputting voltage into meter input terminal, the
voltage induction indicator light may lighten because
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of the existing of induction voltage.
4. The interference sources from outside world (such
as flashlight and motor etc.) may cause wrong
judgment.
6. Maintenance
To avoid electrical shock, remove test leads before
replacing battery or fuse and cleaning
6-1. Battery Replacement
When symbol is found on the display during using
the meter, the battery must be replaced in case that the
meter works abnormally.
The method of replacing battery is:
(1) Switch off the power.
(2) Open battery cover on the back with screwdriver to
take out the battery.
(3) Load the battery with same model and make the
battery cover fixed.
6-2. Fuse Replacement
The step of replacing fuse is:
(1) Switch off the power.
(2) Open lower cover with screwdriver to take out the
broken fuse.
(3) Load the fuse with same Electrical specifications
(F500mA H250V ), recover battery cover and make
the screw fixed.
6-3. Cleaning
When the meter surface is required to clean, please
use soft cloth, don't use organic solvent with corrosive
and solvent action to the case.
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