MS8228
DIGITAL MULTIMETER
OPERATION MANUAL
AUTORANGE DMM
MS8228
mV
μA
hFE
mA
TEMP
Hz
Duty
A
1000V
CAT III
IEC1010
hFE
/
RESETTABLE
FUSED,10A MAX
4.11 Measuring Relative Humidity....................27
4.12
27
4.13 Measuring DC Voltage............................27
4.14 Measuring AC Voltage............................27
4.15 Measuring DC Millivoltage.......................31
4.16 Measuring AC Millivoltage.......................31
4.17 Measuring DC Current............................32
4.18 Measuring AC Current............................3 3
4.19 Measuring Frequency.............................3 4
4.20 Measuring Duty.......................................34
4.21 Measuring Resistance.............................35
4.22 Measuring Capacitance...........................36
4.23 Testing Diode...........................................36
4.24 Testing Continuity......................................37
4.25 Testing Transistor......................................38
4.26 Measuring Temperature
(With Infrared Thermo-Sensor)............40
41
41
41
43
Laser Beam......
26
10
43
’
N
TEMP&RRH
AUTORANGE DMM
MS8228
mV
μA
hFE
mA
TEMP
Hz
Duty
A
1000V
CAT III
IEC1010
hFE
/
RESETTABLE
FUSED,10A MAX
(
hFE
hFE
hFE.
Infrared THERMO-Sensor
Laser Pointer
hFE
Humidity Sensor
- for measuring humidity.
Infrared THERMO-Sensor
- for infrared temperature measuring
Laser Pointer
- for take aim object (infrared temperature measuring)
RS232
AUTO
Laser Pointer
AC(
DC(
hFE
Transistor
)
)
IR-T
Infrared Temperature
ε=0.95
Emissivity
40mV
0.01mV
40mV
0.01mV
(0.8% of reading + 3 digits)
(1.0% of reading + 3 digits)
Ω
Ω
Ω
- Max. input current:
V jack(mV ranges): 400mV
mA jack(μA ranges(: 4mA,
mA jack(mA ranges(: 400mA,
10A jack: 10A
- Overload Protection:
mV ranges: 250V DC or rms AC
μ A/mA ranges: resettable fuses F1 500mA/250V
10A range: F2 10A/250V fuse (quick acting).
- By mV, µA, mA or A range:
Frequency response: 0 ~ 40kHz
Input current range: 1/4 of the rms AC for the range
(higher input voltage at higher frequency)
- Max. input current:
V jack(mV ranges): 400mV
mA jack(µA ranges): 4mA,
mA jack(mA ranges): 400mA,
10A jack: 10A
- Overload protection:
mV ranges: 250V DC or rms AC
µA/mA ranges: resettable fuses F1 500mA/250V
10A range: F2 10A/250V fuse (quick acting).
3.2.10.1 Temperature
°C
1°C
-20°C to 270°C ±(2.0%of reading + 3 digits)
±4.0% of reading
-270°C to 300°C
°F
1°F
-4°F to 520°F ±(2.0%of reading + 6 digits)
hFE
3.2.13 Transistor hFE
hFE
Displaying approximate hFE value 1-1000
for transistor under test (ALL TYPE)
- Base current: ~10A,Vce: ~2V
- Overload protection: resettable fuses F1 500mA/250V.
4.1.4 At IR-T range, whether the test leads are plugged
in or otherwise, the meter will make no response
because no signal input is required from the
input terminals.
3) The back light will go off automatically after 10
seconds.
:
4.8 Laser Beam
Press the “ ” button for infrared temperature
measurement. A laser beam will be transmitted to
facilitate targeting at the object for more accurate result.
1) The laser pointer requires a larger working current.
Frequent use of laser beam will shorten the life of
the batteries. Therefore laser beam should not be
used unless necessary.
2) When the battery voltage is 3.6V, the symbol “
”
(battery low)will appear on the LCD. When laser
beam is being used, even if the batter is 3.6V, the
“
” may appear because of its large working
current which will cause the voltage to drop. (The
accuracy of the measurement cannot be assured
when the “
” symbol appears.) In this case, you
need not replace the batteries yet. Normally, the
batteries can last until the “
” appears when
laser beam is not being used.
4.10.1 Switch on the power by turning the rotary selector.
If the battery voltage is lower than 3.6V, the “
”
symbol will appear and the batteries should be
replaced.
4.10.2 The “
” symbol beside the input lead shows
that the input voltage or current should not
exceed the specified value in order to protect
the internal circuit from damage.
4.10.3 Turn the rotary selector to the required function
and range to be measured. Under the manual
mode, choose the highest range when the value
scale to be measured is unknown.
4.10.4 Connect the common test lead first and then
the charged test lead when making connection.
Take away the charged test lead first when
disconnecting.
4.11 Measuring Relative Humidity
4.11.1 This function is used for measuring the ambient
humidity around the meter.
4.11.2 Turn the rotary selector away from the OFF
position.
4.11.3 The current ambient humidity will be shown on
the humidity display of the LCD.
1) The humidity sensor is placed inside the front part
of the meter and therefore it may take a longer
time to reach balance with the environment being
measured. Furthermore, it takes a longer
intermission time, about 20 seconds, for sampling
and the meter has to be exposed to the environment
for a longer time for accurate reading. Hence it is
not suitable for measuring rapidly changing
ambient humidity.
2) It will take some time for a steady RH reading when
the ambient humidity changes.
4.12 Measuring Temperature
(With Thermo-Resistor)
4.12.1 This function is used for measuring the
ambient temperature around the meter.
4.12.2 Turn the rotary selector away from the OFF
position.
4.12.3 The current ambient temperature will be shown
on the temperature indicator of the LCD.
4.12.4 Press the “°C/°F" button to switch between
°C and °F measurement.
1) The temperature sensor (thermo-resistor) is placed
inside the front part of the meter and therefore it may
take a longer time to reach thermal balance with the
environment. Furthermore, it takes a longer
intermission time, about 20 seconds, for sampling
and the meter has to be exposed to the environment
for a longer time for accurate reading. Hence it is
not suitable for measuring rapidly changing ambient
temperature.
2) The working temperature of the meter is 0 ~ 40 °C.
As the temperature sensor is placed inside the meter,
this function is applicable for measuring ambient
temperature between 0 and 40°C.
3) If exposed to an environment beyond 0 ~ 40 °C ider
range of temperature measurement, but the
accuracy cannot be ensured and damage to the
meter may be caused.
4.13 Measuring DC Voltage
Beware of electrocution.
Pay special attention to avoid electric shock
when measuring high voltage.
Do not input any voltage over 1000V DC,
which may destroy the internal circuit,
although a higher voltage can be shown.
4.13.1 Plug the black test lead into the COM jack and
the red test lead into the V jack.
4.13.2 Set the rotary selector to the
V range position.
4.13.3 Press the "SELECT" button to switch to DC
measurement. Then press the “RANGE” button
to choose the auto range or manual range mode.
4.13.4 Connect the test leads to the voltage source or
load for measurement.
4.13.5 Take the reading on the main indicator of the LCD.
The polarity symbol denotes the polarity of the
end connected by the red test lead.
4.14 Measuring AC Voltage
1) At small voltage range, unsteady readings will
appear before the test leads contact the circuit.
This is normal because the meter is highly sensitive.
When the test leads contact the circuit, the true
reading will be shown.
2) Under the manual range mode, when only 'OL' or
'-OL' is shown on the LCD, it means the
measurement has exceeded the range. A higher
range should be selected.
3) Under the manual range mode, when the scale of the
value to be measured is unknown beforehand,
select the highest range first and lower the range
gradually.
4.14.1 Plug the black test lead into the COM jack and
the red test lead into the V jack.
4.14.2 Set the rotary selector to the
V range position.
4.14.3 Press the "SELECT" button to switch to AC
measurement. Then press the “RANGE” button
to choose the auto range or manual range mode.
4.14.4 Connect the test leads to the voltage source or
load terminals for measurement.
4.14.5 Take the reading on the main indicator of the LCD.
Beware of Electrocution.
Pay special attention to avoid electric shock
when measuring high voltage.
Do not input any voltage 750V rms AC, which
may destroy the inner circuit, although a
higher voltage can be shown.
1) At small voltage range, unsteady readings will
appear before the test leads contact the circuit.
This is normal because the meter is highly sensitive.
When the test leads contact the circuit, the true
reading will be shown.
2) Under the manual range mode, when only 'OL' or
'-OL' is shown on the LCD, it means the
measurement has exceeded the range. A higher
range should be selected.
3) Under the manual range mode, when the scale of the
value to be measured is unknown beforehand,
select the highest range first and lower the range
gradually.
4.15 Measuring DC Millivoltage
4.15.1 Plug the black test lead into the COM jack and
the red test lead into the V jack.
4.15.2 Set the rotary selector to the mV range position.
4.15.3 Press the "SELECT" button to switch to DC
measurement. Then press the “RANGE” button
to choose the auto range or manual range mode.
4.15.4 Connect the test leads to the voltage source or
load terminals for measurement.
4.15.5 Take the reading on the main indicator of the LCD.
The polarity symbol denotes the polarity of the end
1) When the input is open, unsteady readings may
appear. This is normal because the meter is highly
sensitive. When the test leads contact the circuit,
the true reading will be shown.
2) At the manual range mode, when only 'OL' or '-OL' is
shown on the LCD, it means the measurement has
exceeded the range. A higher range should be selected.
3) At the manual range mode, when the scale of the
value to be measured is unknown beforehand, set
the rotary selector to the highest range.
4.17 Measuring DC Current
1) When the input is open, unsteady readings may
appear. This is normal because the meter is highly
sensitive. When the test leads contact the circuit,
the true reading will be shown.
2) At the manual range mode, when only 'OL' or '-OL' is
shown on the LCD, it means the measurement has
exceeded the range. A higher range should be selected.
3) At the manual range mode, when the scale of the
value to be measured is unknown beforehand, set
the rotary selector to the highest range.
4.16 Measuring AC Millivoltage
4.16.1 Plug the black test lead into the COM jack and
the red test lead into the V jack.
4.16.2 Set the rotary selector to the
mV range position.
4.16.3 Press the "SELECT" button to switch to AC
measurement. Then press the “RANGE” button
to choose the auto range or manual range mode.
4.16.4 Connect the test leads to the voltage source or
load terminals for measurement.
4.16.5 Take the reading on the main indicator of the LCD.
Beware of Electrocution.
Turn off the power of the circuit to be
measured before connecting the meter to
the circuit.
4.17.1 Plug the black test lead into the COM jack. When
the current to be measured is under 400mA,
plug the red test lead into the mA jack; when the
current to be measured is over 400mA but under
10A, plug the red test lead into the 10A jack.
4.17.2 Set the rotary selector to the
A range position.
4.17.3 Press the "SELECT" button to switch to DC
measurement. Then press the “RANGE” button
to choose the auto range or manual range mode.
4.17.4 Connect the test leads to the circuit for
measurement.
4.17.5 Take the reading on the main indicator of the
LCD. The polarity symbol denotes the polarity
of the end connected by the red test lead.
1) At the manual range mode, when only 'OL' or '-OL' is
shown on the LCD, it means the measurement has
exceeded the range. A higher range should be
selected.
2) At the manual range mode, when the scale of the
value to be measured is unknown beforehand, set
the range to the highest.
3) “
” means the maximum current of the mA jack is
400mA and the maximum current of the 10A jack is
10A. At the 10A jack, current exceeding the limit will
blow the fuse.
1) At the manual range mode, when only 'OL' or '-OL' is
shown on the LCD, it means the measurement has
exceeded the range. A higher range should be
selected.
2) At the manual range mode, when the scale of the
value to be measured is unknown beforehand, set
the range to the highest.
3) “
” means the maximum current of the mA jack is
400mA and the maximum current of the 10A jack is
10A. At the 10A jack, current exceeding the limit will
blow the fuse.
4.18 Measuring AC Current
4.19 Measuring Frequency
Beware of Electrocution.
Turn off the power of the circuit to be
measured before connecting the meter to
the circuit.
4.18.1 Plug the black test lead into the COM jack.
When the current to be measured is under 400mA,
plug the red test lead into the mA jack; when the
current to be measured is over 400mA but under
10A, plug the red test lead into the 10A jack.
4.18.2 Set the rotary selector to the
A range position.
4.18.3 Press the "SELECT" button to switch to AC
measurement. Then press the “RANGE” button
to choose the auto range or manual range mode.
4.18.4 Connect the test leads to the circuit for
measurement.
4.18.5 Take the reading on the main indicator of the LCD.
4.19.1 Plug the black test lead into the COM jack and
the red test lead into the Hz jack.
4.19.2 Set the rotary selector to the Hz range position
(or press the “Hz/DUTY” button at the AC/DC
V range to switch to Hz measurement).
4.19.3 Connect test leads to the two ends of the source
or load for measurement.
4.19.4 Take the reading on the main indicator of the LCD.
4.20 Measuring Duty
4.20.1 Plug the black test lead into the COM jack and
the red test lead into the Hz jack.
4.20.2 Set the rotary selector to the Hz range position.
4.20.3 Press the "Hz/DUTY" button to switch to DUTY
measurement (or press the “Hz/DUTY” button
at the AC/DC V range to switch to DUTY
measurement).
4.20.4 Connect test leads to the two end of the source
or load for measurement.
4.20.5 Take the reading on the main display of the LCD.
4.21 Measuring Resistance
Beware of Electrocution.
When measuring in-circuit resistance, make
sure that the power of the circuit under test
has been turned off and that all capacitors
have been fully discharged.
4.21.1 Plug the black test lead into the COM jack and
the red test lead into the jack.
4.21.2 Set the rotary selector to the Ω
range position.
4.21.3 Press the "SELECT" button to switch to
measurement. Then press the “RANGE” button
to choose the auto range or manual range mode.
4.21.4 Connect the test leads to the ends of the resistor
or circuit for measurement.
4.21.5 Take the reading on the main indicator of the LCD.
1) At the manual range mode, when only 'OL' or '-OL' is
shown on the LCD, it means the measurement has
exceeded the range. A higher range should be selected.
2) When the input is open, 'OL' will appear on the LCD
to indicate that the range has been exceeded.
3) For measuring resistance above 1MΩ, it may take
a few seconds to get a steady reading. This is normal
for high resistance reading.
4.22 Measuring Capacitance
Beware of Electrocution.
To avoid electric shock, make sure that the
capacitors have been fully discharged
before measuring the capacitance of a
capacitor.
4.22.1 Plug the black test lead into the COM jack and
the red test lead into the
jack.
4.22.2 Set the rotary selector to the
range position.
4.22.3 After fully discharged the capacitor, connect the
test leads to the two ends of the capacitor for
measurement.
4.22.4 Take the reading on the main indicator of the LCD.
1) It may take some time (about 30 seconds for the
200μF range) for steady readings when measuring
high capacity.
2) Sometimes a reading may appear when the circuit
is open. In such case, press the “REL” button to
reset the reading and take measurement again.
4.23 Testing Diode
4.23.1 Plug the black test lead into the COM jack and
the red test lead into the
jack.
4.23.2 Set the rotary selector to the Ω
range position.
4.23.3 Press the "SELECT" button to switch to
test.
4.23.4 Connect the red test lead to the anode and the
black test lead to the cathode of the diode for testing.
4.23.5 Take the reading on the main indicator of the LCD.
1) The meter will show the approximate forward
voltage drop of the diode.
2) When the test leads have been reversed or open,
'OL' will appear on the LCD.
4.24 Testing Continuity
Beware of Electrocution.
Make sure that the power of the circuit has
been turned off and the capacitors have
been fully discharged before testing the
continuity of a circuit.
4.24.1 Plug the black test lead into the COM jack
and the red test lead into the Ω
jack.
4.24.2 Set the rotary selector to the range position.
4.24.3 Press the “SELECT” button to switch to
for continuity test.
4.24.4 Connect the test leads to the two ends of the
circuit for measurement.
4.24.5 If the resistance of the circuit being tested is
less than 40 Ω , the built-in buzzer will sound.
4.24.6 Read the resistance on the main indicator
of the LCD.
If the test leads are open or the resistance of the circuit
is over 400 Ω , “OL” will appear on the LCD.
4.25 Measuring Temperature (Non-Contact)
(With Infrared Thermo-Sensor)
Do not point a laser beam at human eyes.
Despite the low power of the laser beams,
damage to the eyes may be caused if they
are exposed to laser beams for a long time.
To avoid damage to the meter, do not
connect the input plug to any electric signal.
4.25.1 Turn the rotary selector to the IR-T range
position.
4.25.2 Aim the forested of the meter (infrared sensor)
at the surface to be measured.
4.25.3 To ensure that the infrared sensor is targeted
at the object to be measured, press the “
”
button to turn on the laser beam with the red
spot positioned at the centre of the surface
to be measured.
4.25.4 Press the "°C/°F" button to choose °C or °F
measurement.
4.25.5 Take the reading on the LCD.
1) The infrared temperature sensor is placed inside
the front part of the meter. It may take a longer
time to reach thermal balance with the environment.
Therefore the meter should be exposed to the
environment for a longer time for accurate reading.
2) The meter is designed to have a emissivity ε=0.95,
which is the rate for most objects. When measuring
objects with a different reflection rate, different
results may appear.
10mm
3) The following diagram shows the surface diameter
and distance of the object to be measured. Diameter
and distance ratio: the ratio that determines the
surface diameter of the object being measured to the
distance between the object and the lens of the
meter. For example, if the surface diameter of the
object is 10mm, the distance between the object
and the meter should be
80mm (including the
16mm distance from the surface of the meter to
the lens).
object surface
4.26 Testing Transistor
diameter
distance to object
64mm
80mm
4) Make suitable adjustment so that the distance and
diameter ratio between the distance between the
object and the lens of the meter and the surface
diameter of the object being measured is smaller than
8:1 to avoid the measurement result being affected
by such causes as failure to target at the object.
5) Clean the surface of the object to get rid of any frost,
oil, grime, etc. before taking measurements.
6) Apply masking tape or flat black paint to the surface
before taking measurement If the surface of the
object is highly reflective.
7) Larger discrepancy may result if measurement is
taken by the meter through transparent materials
such as glass.
8) Steam, dust, smoke, etc. may affect measurements.
16mm
4.26.1 Set the rotary selector to the hFE range position.
4.26.2 Put two plugs '-' and '+' of transistor test socket
into COM jack and hFE jack respectively.
4.26.3 Identify whether the transistor is NPN or PNP
type and insert emitter, base and collector
leads into the proper holes of the transistor on
the transistor test socket for testing.
4.26.4 Take the reading on the main indicator of the LCD.
Do not put the plug into the wrong jack.
2) Transistor Test Socket1 set
HYS006769
Download PDF