V&A MS8221 User manual

Pocket size digital multimeter
MS8221
Users Manual

CONTENTS
1 SAFETY INFORMATION..............................4
1.1 PRELIMINARY....................................4
1.2 DURING USE .....................................5
1.3 SYMBOL............................................6
1.4 MAINTENANCE ..................................7
2 DESCRIPTION ............................................7
3 SPECIFICATIONS .......................................9
3.1 GENERAL SPECIFICATIONS ................9
3.2 Measurement specifications.................10
3.2.1 DC VOLTAGE ................................... 11
3.2.2 AC VOLTAGE ................................... 11
3.2.3 DC CURRENT .................................. 12
3.2.4 AC Current (A/B/D model)................. 12
3.2.5 Resistance ........................................ 13
3.2.6 Diode test.......................................... 13
3.2.7 Audible continuity test ....................... 13

3.2.8 Audible continuity test (Only B model)14
3.2.9 Temperature (Only C model) ............. 14
4 OPERATING INSTRUCTION .....................15
4.1Voltage measurement .........................15
4.2 Current measurement .........................15
4.3 Resistance measurement ....................17
4.4 Diode test.........................................17
4.5 Continuity test ...................................18
4.6 Temperature measurement ..................18
(Only C model) ..........................................18
4.7 Battery test (only D model)...................19
4.8 Transistor measurement (only B model)
20
5 MAINTENANCE .........................................20
5.1 General Maintenance .........................20
5.2 Fuse replacement ..............................21
5.3 Battery replacement ...........................22

1 SAFETY
INFORMATION
WARNING
To ensure safe operation, and in order to
exploit to the full the functionality of the meter,
please follow the directions in this section
carefully.
This multimeter has been designed according to
IEC61010 concerning electronic measuring
instruments with an overvoltage category CAT III
600V and pollution 2.
Follow all safety and operating instructions to ensure
that the meter is used safely and is kept in good
operating condition.
With proper use and care, the digital meter will give
you years of satisfactory service.
1.1 PRELIMINARY
- When using the meter, the user must observe
all normal safety rules concerning:
Protection against the dangers of electrical
current.
Protection of the meter against misuse.
- When the meter is delivered, check that it has not
been damaged in transit.

- When poor condition under harsh preservation or
shipping conditions caused, inspect and confirm
this meter without delay.
- Test leads must be in good condition. Before using
verify that the insulation on test leads is not
damaged and/or the leads wire is not exposed.
- Full compliance with safety standards can be
guaranteed only if used with test leads supplied. If
necessary, they must be replaced with the same
model or same electric ratings.
1.2 DURING USE
- Before using, you must select the right input jack,
function and range.
- Never exceed the protection limit values indicated
in specifications for each range of measurement.
- When the value scale to be measured is unknown
beforehand, set the range selector at the highest
position.
- Do not measure voltage if the voltage on the
terminals exceeds 600V above earth ground.
- Always be careful when working with voltages
above 60V DC or 30V AC rms, keep fingers
behind the probe barriers while measuring.
- Before rotating the transform switch to change
functions and ranges, disconnect test leads from

the circuit under test.
- Never perform resistance, temperature, diode and
continuity measurements on live circuits.
- Never use the meter under the condition of the
explosive air, steam or dirt.
- If any faults or abnormalities are observed, the
meter can not be used any more and it has to be
checked out.
- Never use the meter unless the rear case is in
place and fastened fully.
- Please do not store or use meter in areas exposed
to direct sunlight, high temperature, humidity or
condensation.
1.3 SYMBOL
Caution:refer to the instruction manual.
Incorrect use may result in damage to the
device or its components.
Earth
This instrument has double insulation.
Fuse: F 2
50mA/600V 10A/600V

1.4 MAINTENANCE
- Please do not attempt to adjust or repair the meter
by removing the rear case while voltage is being
applied. A technician who fully understands danger
involved should only carry out such actions.
- Before opening the battery cover or case of the
meter, always disconnect test leads from all tested
circuits.
- To avoid the wrong reading causing electricity attack,
when the meter displays“ ”, you must change the
battery.
- For continue protection against fire, replace fuse
only with the specified voltage and current ratings: F
250mA/600V (quick acting),10A/600V (quick acting).
- Do not use abrasives or so5lvents on the meter, use
a damp cloth and mild detergent only.
- Always set the power switch to the OFF position
when the meter is not in use.
- If the meter is to be stored for a long period of time,
the batteries should be removed to prevent damage
to the unit.
2 DESCRIPTION
- This meter is a portable professional measuring
instrument with handsome LCD easily reading.

- Single operation of a transform switch makes
measurement convenient. Overload protection
and low battery indication are provided, this meter
is ideal for use in the fields, workshop, school,
hobby and home applications.
- This meter is with the functions of data hold.
NAME OF COMPONENTS
1. LCD display
2. Hold key
3. Rotary switch
4. Terminals

3 SPECIFICATIONS
3.1 GENERAL SPECIFICAT I ON S
- Environment conditions:
600V CAT.III
Pollution degree: 2. Altitude < 2000 m.
- Operating temperature:
0~40OC (32℉to 104℉), (<80% RH,
non-condensing)
- Storage temperature:
-10~50 OC(14℉to 122℉), (<70% RH, battery

removed)
- Temperature Coefficient:
0.1×(specified accuracy) / OC (<18 OC or >28 OC)
- MAX. Voltage between terminals and earth ground:
600V AC rms or 600V DC
- Fuse Protection: mA: F 250mA/600V ∅6.3×32,
10A: 10A/600V ∅6.3×32
- Display: LCD, 1999counts, updates 2-3/sec.
- Over Range indication: LCD will display "1".
- Low battery indication:
The " " is displayed on the LCD.
- Polarity indication: "−" displayed automatically.
- Power source: 9V
- Battery type: 6F22 9V
- Dimensions: 158(L)×74(W)×40(H) mm.
- Weight: 220g. Approx. (battery included).
3.2 Measurement specifications
Accuracy: ±(% of reading + number of digits) at 18°C
to 28°C (64°F to 82°F) with relative humidity to 80%.
(Accuracy is specified for a period one year after
calibration)