Mastech MS8239D User manual

MS8239D
DIGITAL ENGINE ANALYZER
OPERATOR'S MANUAL
HOLD MAX
FUNC
V
4CYL
6CYL 8CYL
8CYL
6CYL
4CYL
DWELL
TACH x10RPM
600V CAT III
COM
RPM
DWELL
10A
FUSED
MAX
600V
AUTO MAX. DATA
MS8239D
ENGINE ANALYZER

CONTENTS
1.1 Preliminary....................................................1
CONTENTS
1.2 During Use...................................................2
1. Safety Information....................................1
1.3 Symbols.......................................................3
1.4 Maintenance................................................4
2.1 Names Of Components...............................5
2.2 Switch, Buttons And Input
Jack Elucidation ...................................6
2. Description...............................................4
3.1 General Specifications.................................7
3.2 Electrical Specifications ..............................8
3. Specifications...........................................7
4.1 Power-up.....................................................11
4.2 Data Hold....................................................11
4. Operating Instruction.............................11
4.3 Maximum Value Hold..................................11
4.4 Function Transform....................................12
4.5 Back Light..................................................12
4.6 Auto Power Off...........................................13
4.8 Preparation For Measurement......................13
4.9 Measuring Dc Voltage...................................13
4.10 Measuring AC Voltage................................15
4.11 Measuring DC Current................................15
4.12 Measuring AC Current................................16
4.13 Measuring Resistance................................16
4.14 Measuring Engine Dwell.............................17
4.15 Measuring Engine Rev.........................17
4.16 Diode Testing.......................................18
4.17 Continuity Testing.......................................18
5.1 Battery Replacement....................................19
5.2 Replace the Probe ..........................................20
5. Maintenance.............................................19
6. Accessories..............................................20
4.7 Preparation For Measurement...................13

01
02
1. Safety Information
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.
Warning
1.1 Preliminary
1.2 During Use
1.15 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.
1.2.1 Before using, you must select the right input jack,
function and range.
1.2.2 Never exceed the protection limit values indicated
in specifications for each range of measurement.
1.2.3 When the meter is linked to a measurement circuit,
do not touch unused terminals.
1.2.4 At the manual range, when the value scale to be
measured is unknown beforehand, set the range
selector at the highest position.
1.2.5 Do not measure voltage if the voltage on the
terminals exceeds 600V above earth 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 transform switch is in the current,
resistance, temperature, diode or continuity mode.
Doing so can damage the meter.
1.2.8 Before rotating the transform switch to change
functions and ranges, disconnect test leads from
the circuit under test.
1.2.9 Never perform resistance, temperature, diode and
continuity measurements on live circuits.
1.2.10 Never use the meter under the condition of the
explosive air, steam or dirt.
1.2.11 If any faults or abnormalities are observed, the meter
can not be used any more and it has to be checked out.
This instrument has been designed according to IEC-1010
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.
1.1.1 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
1.1.2 When the meter is delivered, check that it has not been
damaged in transit.
1.1.3 When poor condition under harsh preservation or
shipping conditions caused, inspect and confirm
this meter without damage.
1.1.4 Test leads must be in good condition. Before using,
verify that the insulation of test leads is not damaged
and the leads metal wire core is not exposed.
•
•
1.2.12 Never use the meter unless the rear case is in
place and fastened fully.
1.2.13 Please do not store or use meter in areas exposed to
direct sunlight, high temperature, humidity or
condensation.

03
1.3 Symbols
AC or DC (alternating current or direct current)
This indicates that the display data is being held.
Low battery indicator, need to replace new ones
Note-Important safety information, refer to the
instruction manual.
Equipment protected throughout by double
insulation or reinforced insulation.
Earth (ground) TERMINAL
Caution, possibility of electric shock
RPM
MAX-H
DATA-H
AUTO
AC
DC
Alternating current
Direct current
Diode
Continuity buzzer
Engine dwell
Round per minute
Reading multiplies 10
The maximum value is being held.
Auto range
×10
CAT III: MEASUREMENT CATEGORY III is applicable to
test and measuring circuits connected to the distribution
part of the building's low-voltage MAINS installation.
04
1.4 Maintenance
1.4.1 Please do not attempt to adjust or repair the
meter by removing the rearcase while voltage is
being applied. A technician who fully understands
danger involved should only carry out such actions.
1.4.2 Before opening the battery cover or case of the meter,
always disconnect test leads from all tested circuits.
1.4.3 To avoid the wrong reading causing electricity
attack, when the meter displays“ ”, you must
change the battery.
1.4.4 Do not use abrasives or solvents on the meter,
use a damp cloth and mild detergent only.
1.4.5 Always set the power switch to the OFF position
when the meter is not in use.
1.4.6 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
- 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 has function of auto range and manual range.
- This meter has function of auto warning.
- This meter has function of auto power off.
- This meter is with the functions of data hold and max
imum value hold.
- When using, it can show ranges engineering unit
enunciators measuring results.
- This meter is a portable professional measuring instrument
with handsome LCD and back light easily reading.

HOLD MAX
FUNC
V
4CYL
6CYL 8CYL
8CYL
6CYL
4CYL
DWELL
TACH x10RPM
600V CAT III
COM
RPM
DWELL
10A
FUSED
MAX
600V
AUTO MAX. DATA
MS8239D
ENGINE ANALYZER
06
2.1 Names of Components
(1) LCD Cover
(2) LCD Display
(3) HOLD Button
(4) Function Button
(6) 10A Jack
(8) Input Jack
(9) Range Flags
(10) Panel
Button
MAX. H Button
(11)
(12)
2.2 Switch, Buttons And Input Jack
Elucidation
• ON/OFF Button
This Button is used to the switch of power.
• 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 the switch of data hold.
• MAX.H Button
This Button is used to the switch of maximum
value hold.
• Button
This button is used to the switch of back light.
Transform Switch
This switch is used to select functions and desired
ranges.
• 10A Jack
Input terminal for current 0~10A.
INPUT Jack
Input terminals except A.
• COM Jack
Common terminal for measurement.
(7) COM Jack
05
(5) Transform Switch

07
3. Specifications
3.1 General Specifications
Accuracy is specified for a period of year after calibration
and at 18 to 28 (64 F to 82 F) with relative humidity
to 75%.
°C °C ° °
3.1.1 Auto ranges and manual range.
3.1.2 Overrange protection for all ranges.
3.1.3 Max. Voltage Between Terminals And Earth
Ground: 600V DC or AC
3.1.4 Operating Altitude: 2000 meters (7000 ft.)
maximum
3.1.5 LCD Display: 16mm height character
3.1.6 Max. Show Value: 1999 (3 1/2)
3.1.7 Polarity Indication: ‘-’indicates negative polarity.
3.1.8 Over range Indication: Display 'OL'
3.1.9 Sampling Time: approx. 0.4 second
3.1.10 Unit showing: showing of function and
electrical capacity.
3.1.11 Low Battery Indication: “ ” displayed
3.1.12 Auto power off time: 15 min.
3.1.13 Power Supply: 1.5V×2 AAAbattery.
3.1.14 Operating Temperature: 0°C to 40°C
(32°F to 104°F)
3.1.15 Storage Temperature: -10°C to 50°C (10°F to 122°F)
3.1.16 Dimension: 150×74×42mm
3.1.17 Weight: approx. 250g(including battery)
08
3.2.1 Dc Voltage
- Input Impedance: 10M
- Overload Protection:
200mV range: 250V DC or AC rms,
2V-600V ranges: 600V DC or AC rms.
- Max. Input Voltage: 600V DC
Ω
3.2 Electrical Specifications
Circumstance Temperature: 23 5 Relative
Humidity: < 75%.
± °C
3.2.2 AC Voltage
200mV
Range Resolution
2V
20V
200V
600V
0.1mV
(0.7% of rdg + 2 digits)±
Accuracy
0.001V
0.01V
0.1V
1V
200mV
Range Resolution
2V
20V
200V
600V
0.1mV (0.8% of rdg + 3 digits)±
Accuracy
0.001V
0.01V
0.1V
1V ±(1.0% of rdg + 3 digits)

09 10
- Input Impedance: 10M
- Overload Protection:
200mV range: 250V DC or AC rms,
2V-600V ranges: 600V DC or AC rms.
- Frequency Range: 40 to 400Hz
- Response: Average, calibrated in rms of sine wave.
- Max. Input Voltage: 600V rms AC
Ω
3.2.3 DC Current
- Overload Protection: unfused.
- Max. Input Current:: 10A
- Frequency Range: 40 to 400Hz
- Response: Average, calibrated in rms of sine wave.
- voltage drop：2A range: 20mV, 10A range: 200mV
3.2.6 Continuity
2.000A
10.00A
0.001A
0.01A
- Overload Protection: unfused.
- Max. Input Current: 10A
- voltage drop: 2A range: 20mV,
10A range: 200mV
3.2.5 Resistance
200Ω
2kΩ
20kΩ
200kΩ
2MΩ
0.1Ω
0.001kΩ
0.01kΩ
0.1kΩ
0.001MΩ
20MΩ0.01MΩ
- Open Circuit Voltage: 0.25V
- Overload Protection: 250V DC or 250V rms AC
Range Function
Built-in buzzer will sound, if resistance
is lower than 50Ω±20Ω
Range Resolution
±(2.0% of rdg+10 digits)
Accuracy
3.2.4 AC Current
2.000A
10.00A
0.001A
0.01A
±(3.0% of rdg+10 digits)
Range Resolution
±(1.0% of rdg +3 digits)
Accuracy
±(1.0% of rdg +1 digit)
±(1.0% of rdg +5 digits)
- Open circuit voltage: approx. 0.5V
- Overload Protection: 250V DC or 250V rms AC
3.2.7 Engine Dwell
Range Resolution Accuracy
4CYL 0.1°
Range Resolution
±(3°)
Accuracy
- Overload Protection: 250V DC or rms AC
0.1°
0.1°
6CYL
8CYL

11 12
3.2.8 Engine Rev
3.2.12 Diode
1mV
Display :read approximate
forward voltage of diode.
- Forward DC Current: approx. 1mA
- Reversed DC Voltage: approx.1.5V
- Overload Protection: 250V DC or rms AC
4. Operating Instruction
4.1 Power-up
Press the “ON/OFF” button to turn the meter
ON or OFF.
4.2 Data Hold
If you need data hold when measuring, you can put
on “DATA-H” button, it will hold the reading; if you
put the button again, data hold is not continue.
4.3 Maximum Value Hold
If you need data hold when measuring, you can put
on “MAX. H” button, it will hold the maximum value;
if you put the button again, maximum value hold is
not continue.
4.5 Back Light
If the light is dark to make the reading
difficult when measuring, you can press
“ ” button for two seconds to turn on the
back light, which will last for 15 seconds.
Continuous pressing the button for two
seconds will turn off the back light.
4CYL 10RPM
Range
Resolution
±(3.0% of rdg + 3 digits)
Accuracy
- Overload Protection: 250V DC or rms AC
6CYL
8CYL
10RPM
10RPM
Range Function
4.4 Function Transform
Put down the "FUNC." when measuring the
current and voltage. Meter will be transformed
between DC and AC range. Put "FUNC." when
measuring the temperature, meter will transform
between and °F range. Put "FUNC." when
measuring the diode and continuity, meter will
transform among them.
Note:
• LED is the main source of back light. Its working
current is large, although the meter has the timer
equipment (time is 15 seconds and it will off
automatically after 15 seconds);often use back light
will shorten thebatteryife, you'd better not to use the
back light so frequently if it's not necessary.
When the battery voltage is less than 2.8V, it will
show“ ”. But if you use back light at the same time,
maybe “ ” will come up even if the battery voltage
is more than 2.8V, because the working current is
higher and the voltage will decline. (When “ ”
shows, the accuracy of the measurement can not be
assured.) You need not replace the battery. When
you use normally (back light is not using), “ ” will
not show up. You need replace it till “ ”show again.
•

13
14
4.6 Auto Warning
If the input voltage is larger than 2V at the range
and if the input current is larger than 10A, buzzer will
have a long sound
4.7 Auto Power Off
If there's no any operation within fifteen minutes
after power is on, meter will auto power off with
five short sounds and a long sound in a minute.
After auto power off, if stir the transform switch
•
•
or put down any button of “FUNC.”, “DATA-H”,
“MAX.H”, ”RANGE”, meter will recover the
working condition.
• If presses the “FUNC” when power is on, auto
power off disab
4.8 Preparation For Measurement
•
•
•
•
Put on the “ON/OFF” button. If the battery voltage is
less than 3.8V, display will show “ ” , the battery
should be changed at this time.
The “ ” besides the input jack shows that the input
voltage or current should be less than specification
on the sticker of the meter to protect the inner circuit
from damaging.
Select a function and a range for the item to be
measured through rotating the transform switch
accordingly. When the value scale to be measured
is unknown beforehand, set the range selector at
the highest position.
When connection, first connect to the public testing
line, then to the electriferous testing line. When you'll
remove it, you should remove the elecriferous one.
4.9 Measuring Dc Voltag
WARNING
You can't input the voltage which more than
600V DC, it's possible to show higher voltage,
but it's may destroy the inner circuit.
Pay attention not to get an electric shock
when measuring high voltage.
4.8.1 Connect the black test lead to the COM jack and
the red test lead to the INPUT jack.
4.8.2 Set the transform switch at the V range position.
4.8.3 Put down the "FUNC." to enter the DC measurement.
4.8.4 Connect test leads across the source or load
under measurement.
4.8.5 You can get a reading from LCD display. The
polarity of the red test lead connection will be
indicated.

15
16
4.10 Measuring Ac Voltage
4.10.1 Connect the black test lead to the COM jack
and the red test lead to the 10A jack.
4.10.2 Set the transform switch at the A range position.
4.10.3 Put down the "FUNC." to enter the DC
measurement.
4.10.4 Connect test leads in series with the load under
measurement.
4.10.5 You can get reading from LCD. The polarity of
red test lead will be indicated.
4.12 Measuring AC Current
4.11.1 Connect the black test lead to the COM jack
and the red test lead to the 10A jack.
4.11.2 Set the transform switch at the A range position.
4.11.3 Put down the "FUNC." to enter the AC
measurement.
4.11.4 Connect test leads in series with the load under
measurement.
4.11.5 You can get reading from LCD.
4.9.1 Connect the black test lead to the COM jack and
the red test lead to the INPUT jack.
4.9.2 Set the transform switch at the V range position.
4.9.3 Put down the "FUNC." to enter the AC
measurement.1
4.9.4 Connect test leads across the source or load
under measurement.
4.9.5 You can get reading from LCD.
4.11 Measuring Dc Current
Shut down the power of the tested circuit, then
connect the meter with the circuit for measurement.
Shut down the power of the tested circuit, then
connect the meter with the circuit for
measurement.
4.13 Measuring Resistance
4.12.1 Connect the black test lead to the COM jack
and the red test lead to the INPUT jack.
4.12.2 Set the transform switch at the range position.Ω
4.12.3 Connect test leads across the resistance under
measurement.
4.12.4 You can get reading from LCD.
You can't input the voltage which more than 600V rms
AC, it's possible to show higher voltage, but
it's may destroy the inner circuit. Pay attention not
to get an electric shock when
measuring voltage.
WARNING
WARNING
WARNING
When measuring in-circuit resistance, be sure the
circuit under test has all power removed and that
all capacitors have been discharged fully.
WARNING

17
18
413.1 Connect the black test lead to the COM jack and
the red test lead to the INPUT jack.
4.13.2 Set the transform switch at the desired DWELL
range position according to the measured
cylinder of the engine.
4.13.3 Connect the black test lead to the iron or the
negative pole of the storage cell, and the red
one to the low voltage connection pole of the
divider or the negative pole of the ignition
winding for measurement.
4.13.4 You can get reading from LCD after the engine
is started.
.
4.14.1 Connect the black test lead to the COM jack
and the red test lead to the INPUT jack.
4.14.2 Set the transform switch at the desired TACH
range position according to the measured
cylinder of the engine.
4.14.3 Connect the black test lead to the iron or the
negative pole of the storage cell, and the red
one to the low voltage connection pole of the
divider or the negative pole of the ignition
winding for measurement.
4.20.4 You can get reading from LCD after the engine
is started.
4.16 Testing Diode
4.14 Measuring Engine Dwell
4.15 Measuring Rev
4.15.1 Connect the black test lead to the COM jack and
the red test lead to the INPUT jack. (The polarity
of red lead is “+”)
4.15.2 Set the transform switch at the range position.
4.15.3 put down the "FUNC." transformed at test.
4.15.4 Connect the red lead to the anode, the black
lead to the cathode of the diode under testing.
4.15.5 You can get reading from LCD.
4.17 Continuity Test
4.16.1 Connect the black test lead to the COM jack and
the red test lead to the INPUT jack.
4.16.2 Set the transform switch at the range position.
4.16.3 put down the "FUNC." transformed at
continuity test.
4.16.4 Connect test leads across two points of the
circuit under testing.
4.16.5 If continuity exists( i.e., resistance less than
about 50Ω±20Ω), built-in buzzer will sound.
Note:
• The meter will show the approximate forward voltage
drop of the diode. figure‘OL’will be displayed.
• When the input is not connected, i.e. at open circuit,
the figure “OL” will be displayed.
WARNING
When testing the circuit continuity, be sure that the
power of the circuit has been shut down and all
capacitors have been discharged fully.

Note:
• If the input open circuit (or the circuit resistance
measured is higher than 200Ω), then the figure '0L'
will be displayed.
5. Maintenance
5.1 Battery Replacement
6. Accessories
(1) Test Leads: Electric Ratings 1000V 10A one piece
(2) Battery: 1.5V, AAA two pieces
one piece(3) Operating Manual
19
5.2 Replace the Probe
R-00-05-0873
Before attempting open the battery cover or case of
the meter, be sure that test leads have been
disconnected from measurement circuit to avoid
electric shock hazard.
WARNING
WARNING
To avoid electric shock, make sure that the test
leads have been clearly move away from the
circuit under measurement before opening the
battery cover of the meter.
WARNING
Do not mix old and new batteries. Do not mix
alkaline, standard (carbon-zinc), or rechargeable
(ni-cad, ni-mh, etc) batteries.
If the sign “ ” appears, it means that the batteries
should be replaced.
Loosen the fixing screw of the battery cover and remove it.
Replace the exhausted batteries with new ones.
Put the battery cover back and fix it again to its origin form.
Note:
Do not reverse the polarity of the batteries.
If insulation on probe is damaged, replace it.
WARNING
Use meet EN 61010-031 standard, rated CAT III 600V, 10A or
better probe.