Mastech MS8211 User manual

MS8211
DIGITAL MULTIMETER
INSTRUCTION MANUAL
Ω

1.1 Preliminary...............................................1
CONTENTS CONTENTS
1. SAFETY INFORM...............................1 4.4 Range Transform................................10
1.2 During use...............................................2
1.3 Symbols..................................................3
1.4 Maintenance...........................................4
2. DESCRIPTION...................................4
2.1 Names OF Components..........................5
2.2 Components Elucidation .........................6
3. SPECIFICATIONS.............................6
3.1 General Specifications...........................7
3.2 Electrical Specifications..........................7
4. OPERATING INSTRUCTION.............9
4.1 Data Hold..............................................9
4.2 Maximum Value Measuring
And Hold.............................................10
4.3 Function Transform...............................10
4.5 Auto Power Off....................................10
4.6 Preparation For Measurement.............11
4.7 Measuring DC Voltage........................11
4.8 Measuring AC Voltage........................13
4.9 Measuring Resistance........................14
4.10 Diode Testing...................................15
4.11 Continuity Testing.............................16
4.12 AC Voltage Detect.............................17
5. MAINTENANCE............................19
5.1 Maintenance.......................................19
5.2 Test leads Replacement.....................20
6. ACCESSORIES............................20

05 0 6
2.2 Components Elucidation
- Non-contact detecting is convenient to test the socket
or the lead whether is with power or not.
- This meter has function of auto range and manual range.
- This meter has function of auto power off.
- This meter is with the functions of data hold and
maximum value measure and hold.
- When using, it can show ranges engineering unit
enunciators measuring results.
2.1 Names Of Components
(1) Probe
(2) Rotatable Probe Socket
(3) LED Indicator
(4) Protection Ring
(5) Transform Switch
(6) Sensitivity Adjust Knob
(7) FUNC. Button
(8) RANGE Button
(9) MAX.H Button
(10) DATA-H Button
(11) Panel
(12) LCD Display
(13) COM Jack
- RANGE Button
This button is used to transform Auto range or manual
range.
- FUNC. Button
This button is used to transform function.
- DATA-H Button
This Button is used to hold data.
- MAX.H Button
This button is used to measure and hold the maximum
value.
- Transform Switch
This switch is used to select functions and desired
ranges.
- Probe
Input terminals for V/Ω/ / and AC voltage detector.
- COM Jack
Common terminal for measurement.
- LCD Display
At V/Ω/ / range, the measuring result can be
displayed.
- LED Indicator
At TEST range, ACV detecting result can be indicated.
- Rotatable Probe Socket
Rotating the probe in or out of the meter.
- Protection Ring
To keep the hand from the probe behind the ring.
- Sensitivity Adjust Knob
To adjust the sensitivity while ACV detecting.
3. SPECIFICATIONS
Accuracy is specified for a period of year after calibration
and at 18°C to 28°C(64°F to 82°F) with relative humidity
to 75%.

4.6 Preparation For Measurement
4.6.1 Set the transform switch to the right range. At the
manual range, when the value scale to be measured
is unknown beforehand, select the highest range.
4.6.2 When measuring, at first, connect to the public (COM)
testing line, then connect the probe tip of the meter to
the circuit under test.
4.6.3 If the battery voltage is less than 2.4V, display will show
“ ”, the battery should be changed at this time.
11 1 2
4.7 DC Voltage Measuring
WARNING
Risk of Electrocution.
You can't input the voltage which is higher than
600V DC, it's possible to show higher voltage,
but it may damage the inner circuit or cause
electrical shock.
Pay attention to avoid getting an electric shock
when measuring high voltage.
4.7.1 Rotate the probe socket clockwise to spin out the
probe from the meter.
4.7.2 Insert the black test lead or test clip in the COM jack.
4.7.3 Set the transform switch at the V range position.
4.7.4 Press the “FUNC” Button to transform to DC
measurement. Auto range and manual range can be
transformed by pressing the “RANGE” button.
4.7.5 Connect the probe tip of the meter and probe tip of the
test lead (or test clip) across the power source or be
loaded on the two sides under measurement.
4.7.6 You can get a reading from LCD display. The polarity
of the tested terminal which the tip of the meter
connection will be indicated.
- At the little voltage range, the meter will show unsteady
reading when test leads haven't reach the circuit, it’s
normal because the meter is very sensitivity. When meter
touch the circuit, you can get the true reading.
- At the manual range mode, when only the figure ‘OL’ is
displayed, it indicates overrange situation and the higher
range has to be selected.
- At the manual range mode, when the value scale to be
measured is unknown beforehand, select the range to
the highest position and set down gradually.
NOTE:

15 1 6
- At the manual range mode, when only the figure ‘OL’ is
displayed, it indicates overrange situation and the
higher range has to be selected.
- For measuring resistance above 1MΩ, the meter may
take a few seconds to get stable reading.
- When the input is not connected, i.e. at open circuit,
the figure ‘OL’ will be displayed for the overrange
condition.
4.10 Testing Diode
WARNING
Risk of Electrocution.
When measuring in-circuit resistance, be sure
the circuit under test has all power removed
and that all capacitors have been discharged
fully.
NOTE:
4.10.1 Rotate the probe socket clockwise to spin out the
probe from the meter.
4.10.2 Insert the black test lead or test clip in the COM
jack.
4.10.3 Set the transform switch at the range position.
4.10.4 put down the “FUNC” transformed at test.
4.10.5 Connect the probe tip of the meter to the anode of
the diode, the black test lead (or test clip) to the
cathode of the diode.
4.10.6 You can get reading from LCD display.
NOTE:
- The meter will show the approximate forward voltage
drop of the diode.
- If the meter and the lead connection is reversed, only
figure ‘OL’ will be displayed.
- When the input is not connected, i.e. at open circuit,
the figure ‘OL’ will be displayed.
4.11 Continuity Test
WARNING
Risk of Electrocution.
When testing the circuit continuity, be sure
that the power of the circuit has been shut
down and all capacitors have been discharged
fully.
4.11.1 Rotate the probe socket clockwise to spin out the
probe from the meter.
4.11.2 Insert the black test lead or test clip in the COM
jack.
4.11.3 Set the transform switch at the range position.
4.11.4 Put down the “FUNC.” transformed at
continuity test.