Mastech MS8212A User manual

MS8212A
Pen-type Digital
Multimeter Manual
CAT III
600V

CONTENTS CONTENTS
1. .................Safety Information......... .......1
3. Specifications.................. .....7............
1.1 Preparing for use ........ ..........1....................
1.2 During Use........ ..............................2....
1.3 Safety Symbols ........ ........ ..3.................... ..
1.4 Maintenance ....... ............................4....
2. Description......... .......4...........................
2.1 Front Panel .................. ...........5............
2.2 Buttons and Functions . .... ..... . ................6
3.1 General specifications ........... ...........7.....
3.2 Technical Specifications. . . .............8. .... ....
4. Using the Meter................. ...11............
4.1 Reading Hold. ..... ..................... .... .......11
4.2 Max Hold. .... ..... . ................................11
4.3 Function Button ......... .... .......11..... .........
4.4 Manual Range . .... ..... . .........................11
4.5 Auto Power Off. .... ..... . ........................11
4.6 Preparing for Measurement.. .......12..........
4.7 DC Voltage. . ..............................12.... ....
4.8 AC Voltage ........ .... .. .....14..... ... .............
4.9 Resistance. . ..............................15.... ....
4.10 Diode Test . . .............................16.... ....
4.11 Continuity.. . ......17.......... .....................
4.12 DC Current .... ..... .............................18
4.13 AC Current........ .... .. .....19..... ... ............
4.14 Logic Test.. .. ..... . ..............................19
4.15 Non-Contact Voltage (NCV) .................20
5. Maintenance................. .. .21............. ...
5.2 Replacing the Test Lead
(or alligator clip) .......... ... .......21..... .........
5.1 Replacing the Batteries. ..... ...................21
6. Accessories ........... ..... .. .. ............. ... 22

01 02
1.Safety Information
To reduce the risk of fire, electrical shock, product
damage or personal injury, please follow the
safety instructions described in the user manual.
read the user’s manual before using the meter. If
the equipment is used in a manner not specified
by the manufacturer, the protection provided by
the equipment may be impaired.
WARNING
This meter is designed and manufactured according to safety
requirements of EN61010-1, EN61010-2-030, EN61010-2-033,
EN61010-031 concerning electronic measuring instruments
with a measurement CAT III 600V and pollution degree 2 and
safety requirements for electrical measurement and test.
Follow all safety instructions to ensure safe use of the
instrument.
Following these guidelines will yield many years of satisfactory
service.
1.1 Preparing for use
1.1.1During use, observe all standard safety rules:
-Use protection to prevent electric shock.
-Do not misuse the instrument.
1.1.2 Check the meter to see if there was any damage
during transit.
1.1.3 Check test leads for cracks or breaks in the
insulation on the wires.
1.1.4 If the test leads need to be replaced, meter’s safety
can only be guaranteed with similar spec leads.
1.2 During Use
1.2.1 Always make sure the rotary switch is at the
correct function and range.
1.2.2 Do not exceed the protection limit values indicated
for each function
1.2.3 Do not touch test lead tips while connected to a
measurement circuit
1.2.4 In manual range if the value to be measured is
unknown, select the highest range first and lower
as needed.
1.2.5 Do not measure voltages that may exceed 600V
between the terminals and ground.
1.2.6 Always be careful when working with voltages
above 60V DC or 30V AC RMS. Keep fingers
behind the probe barriers while measuring.
1.2.7 Never connect the meter leads across a voltage
source while the rotary switch is in the resistance,
diode or continuity mode. Doing so can damage
the meter.
1.2.8 Do not perform resistance, diode and continuity
measurements on powered circuits.
1.2.9 Disconnect the test leads from the circuit before
changing functions on the rotary switch.
1.2.10 Do not place the meter in an environment with
high pressure/temperature, dust, explosive gas
or vapor.
1.2.11 Stop using the meter if any abnormalities or
failures occur.
1.2.12 Do not connect the test leads to a circuit without
the battery securely fastened.
1.2.13 Do not store the meter in an area of direct sunlight,
high temperature or high humidity.

03 04
1.3 Safety Symbols
Data Hold
Auto-range
AUTO
Low Battery
Important safety information.See manual
for details.
Complies with European Union (EU) standards
Equipment protected throughout by double
insulation or reinforced insulation.
Earth ground
MEASUREMENT CATEGORY III is applicable
to test and measuring circuits connected to the
distribution part of the building's low-voltage
MAINS installation.
CAT III
Alternating Current
AC
DC Direct Current
Both direct and alternating current
Diode
Continuity Buzzer
Max Hold
M.H
D.H
1.4 Maintenance
1.4.1 Repairs should only be implemented by trained
personnel.
1.4.2 Remove test leads from measurement circuits
before opening the battery cover.
1.4.3 In order to avoid incorrect readings that may cause
damage or personal injury, replace batteries as
soon as the “ ” symbol appears.
1.4.4 Use a damp cloth and mild detergent to clean the
meter.Do not use abrasives or solvents.
1.4.5 Move the rotary switch to the OFF position when
the meter is not in use.
1.4.6 Remove the batteries if the meter is not going to
be used for an extended period of time.
2. Description
• This meter is a professional, portable meter with an
easy to read LCD screen.
• Easy to use with one hand, overload protection
provided,low battery indication, and suitable for use
in factories,schools, by enthusiasts and hobbyists alike.
• Both auto-range and manual-range available.
• Automatic power off feature
• Data hold and Max. hold features
• During use, the instrument automatically shows the
value and unit of the measurement.
Conforms to UL STD. 61010-1, 61010-2-030,
61010-2-033, 61010-031; Certified to CSA STD
C22.2 NO. 61010-1,61010-2-030, 61010-031,
IEC STD.61010-2-033

05 06
2.1 Front Panel
1.Positive test probe (+)
2.Probe cover (removable)
3.NCV Indicator
4.LED indicators
5.Protective ring
6.Rotary switch
7.Data hold button (HOLD)
8.Range button (RAN)
9.Function button (FUNC)
10.Max hold button (MAX)
11.Non-contact voltage button (NCV)
12.Panel
13.LCD screen
14.COM jack (-)
2.2 Buttons and Functions
- Function Buttons
mA
Ω
Logic
Switches between DC and AC
voltage.Keep pressing during
the Logic testing.Switches
between Resistance
measurement, Diode Test and
Continuity check.Switches
between DC and AC current.
Button Function Description
HOLD
RAN
MAX
Any switch
position
Power-up Option
Ω and mA
This Button is used to hold data.
Disables automatic power-off
feature.
Switch ranges in manual-range.
Hold to return to auto-range.
Used to measure and hold the
maximum value.
NCV Any switch
position
Power-up Option
Hold for Non-contact voltage
detection.
FUNC
Rotary switch: select between functions.
- Test probe: for V/Ω/ / measurements.
- COM jack: common test lead input.
- LCD display: shows results of measurements.
- LED indicator: In Logic mode, green indicated low
level, red indicated high level.
- Probe cover: used when making category III or higher
measurements.Twist to remove if making category II or
lower measurements.
- Protection ring: Keep hands behind the protection ring
and away from the probe to avoid injury.
- NCV Indicator:Detection of NCV,AC voltage indication.
1245678910 11 12 14
313
Logic
mA

07 08
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%.
3.1 General specifications
• Environment conditions: 600V CAT III
Pollution degree: 2 Altitude < 2000m
Operating temperature: 0~40°C, 32°F~122°F
(<80% RH, <10℃ non-condensing)
Storage temperature: -10~50 °C, 14°F~122°F
(<70% RH, battery removed)
• Max. Voltage Between Terminals
And Earth Ground: 600V DC or AC
• Auto ranges and manual range.
• Display: 20mm LCD
• Max. Show Value: 1999 (3 ½)
• Polarity Indication: ‘-’indicates negative polarity.
• Overrange Indication: Display ‘OL’.
• Sampling Time: approx. 0.4 second
• Unit showing: showing of function and electrical
capacity.
• Low Battery Indication: displayed
• Fuse Protection: FF400mA 600V
• Auto power off time: 15 min.
• Power Supply: 1.5V×2 AAA .
• Dimension: 222×43×29 mm
• Weight: approx. 129g(including battery)
H
batteries
3.2 Technical Specifications
(ambient temperature: 23±5°C, relative humidity <75%)
2V
20V
200V
0.01V
0.001V
0.1V
200mV 0.1mV
Input impedance: 10MΩ
- Overload protection: 200mV range: 250V DC or AC rms
2V-600V ranges: 600V DC or AC rms
- Max. input voltage: 600V DC
±(0.7% reading + 2dgt)
Measuring Range Resolution Accuracy
3.2.1 DC Voltage
600V 1V
2V
20V
200V
0.01V
0.001V
0.1V
200mV 0.1mV
Input impedance: 10MΩ
- Overload protection: 200mV range: 250V DC or AC rms
2V-600V ranges: 600V DC or AC rms
- Frequency range: 40~400Hz
- Response: average (rms of sine wave)
- Max. input voltage: 600V AC rms
±(0.8% reading + 3dgt)
Measuring Range Resolution Accuracy
3.2.2 AC Voltage
600V 1V ±(1.0% reading + 3dgt)

09 10
200mA 0.1mA
20mA 0.01mA
-Overload protection: resettable fuse
±(1.5% rdg + 3dgt)
Measuring Range Resolution Accuracy
3.2.6 DC Current
200mA 0.1mA
20mA 0.01mA
-
- Frequency range: 40~400Hz
- Response: average (rms of sine wave)
Overload protection: resettable fuse
±(2.0% rdg + 3dgt)
Measuring Range Resolution Accuracy
3.2.7 AC Current
2kΩ
20kΩ
200kΩ
0.01kΩ
0.001kΩ
0.1kΩ
200Ω0.1Ω
-
- Overload protection: 250V DC or AC rms
Open circuit voltage: approx. 250mV
±(1.0% reading + 3dgt)
Measuring Range Resolution Accuracy
3.2.3 Resistance
2MΩ0.001MΩ
±(1.0% reading + 1dgt)
20MΩ0.01MΩ±(1.0% reading + 5dgt)
-
- Overload protection: 250V DC or AC rms
Open circuit voltage: approx. 500mV
Resolution
0.001V
Forward DC current: approx. 1mA
- Reverse DC voltage: approx. 1.5V
- Overload protection: 250V DC or AC rms
Function Description
Displays approx. forward-
biased voltage
If measured resistance is less than
50Ω, buzzer will sound.
3.2.4 Continuity
3.2.5 Diode test
Function Description
3.2.8 Logic Test
- Input impedance: 1MΩ
- Overload protection: 250V DC or AC rms
Function Description
Logic
ov Low“0” 1.5V
Green
LED on
Green,Red
LED off
3.5V High“1”
Red LED
on
5V

11 12
4. Using the Meter
4.1 Reading Hold
4.1.1 During measurement, press the “HOLD” button to
keep the current reading on the display. “D.H” will
appear of the display.Press “HOLD” again to return
to normal display.
4.2 Max Hold
4.2.1 During measurement, press the “MAX” button and
the display will show the maximum value recorded.
“M.H” will appear on the display.Press “MAX” again
to return to normal display.
4.3 Function Button
4.3.1 In voltage/current modes, press the “FUNC” button
to switch between AC/DC. At the resistance/diode/
continuity position, press “FUNC” to switch
between these modes.
4.4 Manual Range
4.4.1 In voltage/current/resistance modes, the default
range is “AUTO.” Press the “RAN” button to switch
to manual range. Each press of the button
increases the range, and returns to the lowest
range once pressed in the highest range.Hold
down “RAN” to return to auto-range.
4.5 Auto Power Off
4.5.1 The meter has an auto power off feature that will
turn the meter off automatically if left on.After
approx.14 minutes of non-use, the meter will
sound 5 short beeps and then 1 minute later the
meter will sound 1 long beep and turn itself off.
4.5.2 After auto power off has occurred, either move the
rotary switch or press the “FUNC”, “MAX” or “RAN”
buttons to turn the meter back on.
4.6 Preparing for Measurement
4.6.1 Select the desired function using the rotary switch.
If in manual mode, select the highest range first if
the value to be measured is unknown beforehand
and lower as needed.
4.6.2 When connecting the meter to a circuit, connect the
common lead first then the meter’s test probe.
4.6.3 If the battery voltage becomes <2.4V, the“ ”
symbol appears on the display.Replace the
batteries before making measurements.
4.5.3 If you hold down the “HOLD” button when turning
on the meter, this will disable the auto power off
function.The auto power off function will re-enable
after the meter is turned off again.
4.7 DC Voltage
4.7.1 Use the probe cover if making measurements on
category III installations.
4.7.2 Insert the black test lead into the COM jack.
4.7.3 Turn the rotary switch to the position.
4.7.4 The default mode is DC voltage. Press “RAN” to
switch to manual range if needed.
4.7.5 Connect the test probe and test lead across the
voltage source or load for measurement.
4.7.6 The display will show the measured value.Observe
the polarity of the test probe for DC voltage
measurements.

13 14
To prevent electric shock and damage to the meter
or personal injury, do not measure voltages that
may exceed 600V DC.
WARNING
Note:
- Before connecting the probe and test lead at lower
voltage ranges, the display may show erratic readings.
This is normal because the meter is highly sensitive.
Once a connection is made, the true reading will be
displayed.
- “OL” indicated an over-range situation in manual mode.
A higher range should be selected.
- In manual mode, select the highest range first if the
value to be measured is unknown beforehand and
lower as needed.
4.8 AC Voltage
To prevent electric shock and damage to the meter
or personal injury, do not measure voltages that
may exceed 600V AC rms.
WARNING
4.8.1 Use the probe cover if making measurements on
category III installations.
4.8.2 Insert the black test lead into the COM jack.
4.8.3 Turn the rotary switch to the position.
4.8.4 The default mode is DC voltage. Press “FUNC” to
switch to AC voltage. Press “RAN” to switch to
manual range if needed.
4.8.5 Connect the test probe and test lead across the
voltage source or load for measurement.
4.8.6 The display will show the measured value.

15 16
Note:
- Before connecting the probe and test lead at lower
voltage ranges, the display may show erratic readings.
This is normal because the meter is highly sensitive.
Once a connection is made, the true reading will be
displayed.
- “OL” indicated an over-range situation in manual mode.
A higher range should be selected.
- In manual mode, select the highest range first if the
value to be measured is unknown beforehand and
lower as needed.
- Millivolt range (mV) is only available in manual range
mode.
4.9 Resistance
Risk of electric shock. be sure all power to circuit
is off and capacitors have fully discharged before
measureing resistance
WARNING
4.9.1 Use the probe cover if making measurements on
category III installations.
4.9.2 Insert the black test lead into the COM jack.
4.9.3 Turn the rotary switch to the Ω position. Press
“RAN” to switch to manual range if needed.
4.9.4 Connect the test probe and test lead across the
resistance for measurement.
4.9.5 The display will show the measured value.
Note:
- “OL” indicated an over-range situation in manual mode.
A higher range should be selected.
- If the resistance measured is greater than 1M , the
meter may take a few seconds to get a stable reading.
This is normal for high resistance measurements.
- When the leads are not connected or when measuring
an open circuit, the display will read “OL”.
Ω
4.10 Diode Test
4.10.1 Use the probe cover if making measurements on
category III installations.
4.10.2 Insert the black test lead into the COM jack.
4.10.3 Turn the rotary switch to the position.
4.10.4 The default mode is resistance.Press “FUNC” to
switch to diode test.
4.10.5 Connect the test probe to the anode (+) and test
lead to the cathode (-) of the diode.
4.10.6 The display will show the measured value