Mastech MS8233E User manual

DIGIT AL MUL TIMETER
MODEL:MS8233E
Users Manual


Table of Contents
1. Introduction
2. Safety note
3. Explanation of Controls and Indicators
3-1. Product illustration
3-2. Functional push button
3-3. LCD display
4. Specification
4-1. General Specification
4-1. Electrical Specification
5. Measurement operation
5-1 DC voltage &AC voltage measurement
5-2. Resistance measurement
5-3. Diode & Continuity check
5-4. DC/AC mA measurement
5-5. DC/AC 10A measurement
5-6. Temperature measurement
5-7 Detecting AC electric field
6. Maintenance
6-1. Replacing the battery
6-2. Replacing the fuse
6-3 Replacing the Test lead
6-4. Cleaning and Decontamination
1. Introduction
This manual is used to MS8233E Digital Muti Meter only..
This Meter is a handheld and battery operated Digital Multi Meter(DMM) with
multi function. This Meter is designed to meet IEC61010-1 & CAT II 600V
over voltage category and double insulation. The meter with holster that is
giving the main body, though downsized, high resistance against the shock of a
drop.
Protection provided by the instrument will be impaired if used in a manner not
specified by the manufacturer.
This operating instruction covers information on safety and caution. Please
read relevant information carefully and observe all the warnings and note
strictly.
The DMM as general measurement tool and widely used in the school,
laboratory, factory and other social field.
2. Safety note
Warning
To avoid possible electric shock or personal injury and to avoid possible
damage to the meter or to the equipment under test, adhere to the following
rule:
Do not apply more than the rated voltage, of marked on the meter,
between the input terminal and grounding terminal..
Do not apply voltage between COM and OHM terminal, in the
resistance measuring state.
Do not measure current with test lead inserted into voltage or OHM
terminal.
Do not expose the instrument to the direct sun light, extreme

temperature and humidity or dew full.
Inspect the test lead for damaged insulation or exposed metal.
Before measuring current, check the Meter’s fuses and turn off
power to the circuit before connecting the meter to the circuit.
Disconnect circuit power and discharge all high voltage capacitors
before testing continuity, diode, resistance, capacitance or current.
Hazardous voltages in the test before measurement of what is known
voltage to determine that determine that the equipment is functioning
correctly.
Note international Electrical Symbol.
Dangerous Voltage
Ground
AC （Alternating
current）
Warning see
explain in manual
DC (Direct Current)
Double insulation
AC or DC
Fuse
This product has been tested to the requirements ofC
AN/CSA-C22.2 No. 61010-1, second edition, including
Amendment 1, or a later version of the same standard
incorporating the same level of testing requirements”.
CONFORMS TO UL STD. 61010-1,
IEC 61010-031
CERTIFIED TO CSA STD. C22.2 No. 61010-1 and
61010-031
3. Explanation of controls and indicators
3-1. Meter illustration
10
1
23
6
7
8
45
4
Fig. 1 Exterior view
-3 –

①LCD display
②“MAX”push button
③“BACK LIGHT”push button
④‘HOLD”push button
⑤“FUNC”Push button
⑥Rotary Switch (Knob)
⑦“V/Ω/uA/mA/℃”Input terminal
⑧“COM”input terminal
⑨“10A”input terminal
⑩NCV indicator [LED]
- 4 -
3-2. Functional push button
Push button
Function
Func
“FUNC”key is the function select key that acts with trigger.
Use the key as switch of DC/AC current, Diode/Continuity
and ℃/℉.
HOLD
Press “HOLD”to enter and exit the hold mode in any mode.
That act with trigger.
MAX
This key is act with trigger. Press this key once, the
maximum value is holding (Will displays ‘MAX’symbol in
the LCD).
After pressing the key, A/D will keep working, and the
display value are always up dated and kept the maximum
value.
NOTE: The actual gained value is not the peak value.
*
This key is used control Backlight. This key is act with
trigger. When press and hold the key over 2 sec, will enable
Backlight.
Press the key again , the backlight will disable.

- 5 -
3-3. Display indicators
Number
Indicator
Meaning
1
DC voltage or current
2
AC voltage or current
3
Diode
4
MAX
Maximum value
5
HOLD
Data hold
6
Low battery indicator
7
MKΩ
ΩKΩMΩis unit of resistance
8
℃/℉
The unit of temperature
(℃: Centigrade; ℉: Fahrenheit)
9
µmVA
mV ,V is unit of voltage
µA, mA, A is unit of current
10
－
Indicate negative reading
- 6 -
Fig. 2 LCD
4．Specification
4-1. General Specification
●Auto ranging DMM , that full scale is 2000 counts
●Display : 3 1/2 digit LCD display..
●Over load protection: Used the PTC protection circuit for Resistance,
temperature
●AC electric field detection function(NCV function)
●DATA HOLD function
●MAX value hold function
●Back Light
●Low battery indication
- 7 -

●Auto Power- OFF. : If the meter is idle for 15 minutes (idle time), the meter
automatically turns the power off. After auto power-off, pushing any of the push
button or changing the rotary switch can turn on the meter again.
NOTE: （1）After auto power off in the AC mode, if changing the rotary
switch to the DC mode, the Re-power on if disabled.
(2) The meter enters sleep mode after quto power off. If press
“HOLD”push button to re-power on in the sleep mode, the auto
power off function is disabled.
●Operating temperature & Humidity: 0 ~ 40℃(32 ~104 ℉) &< 80% RH
●Storage temperature & Humidity: -10 ~ 50℃(14 ~ 122 ℉) & <70%RH
●Power Supply: 9V Battery(6F22 or 1604A Type) x 1pc.
●Safety Class: IEC 61010-1, CAT II 600V.
●Dimension (Lx W x H) & Weight: 140 x 67 x 30mm, Approx. 112g
Accessary: 1. K-type temperature probe[P3400]----- 1pc
2. User’s Manual ---------------------------- 1pc
3. Test lead ---------------------------- 1set
4. 9V Battery --------------------------- 1pc
4-2. Electrical Specification ( at 23±5℃; <75% RH)
4.2.1 DC Voltage
Range
Resolution
Accuracy
200mV
0.1mV
±（0.5% rdg + 2dgt）
2V
0.001V
20V
0.01V
200V
0.1V
600V
1V
±（0.8% rdg + 2dgt）
- 8 -
* Over load protection: SG(Spark Gap) used to protect that the voltage
overred 1500V
4.2.2AC Voltage
Range
Resolution
Accuracy
2V (40Hz-400Hz)
0.001V
±（0.9% rdg + 3dgt）
20V (40Hz-400Hz)
0.01V
200V (40Hz-400Hz)
0.1V
600V (40Hz-200Hz)
1V
±（1.2% ）rdg + 3dgt
* SG(Spark Gap) used to protect High voltage that is
over 1500V.
4.2.3 Resistance
Range
Resolution
Accuracy
200Ω
0.1Ω
±（0.8% rdg + 2dgt）
2kΩ
0.001kΩ
20kΩ
0.01kΩ
200kΩ
0.1kΩ
2MΩ
0.001MΩ
±（1.0% rdg + 2dgt）
20MΩ
0.01MΩ
4.2.4 Diode check
Range
Resolution
Function
0.001V
Will display the forward drop voltage.
* Operating current：about 1mA
* Open circuit voltage：about 1.48V
- 9 -

4.2.5 Continuity
Range
Function
If measured resistance less than 100Ω, will
buzzer is sounded.
* Open voltage: about 0.5V
4.2.6 DC Current
Range
Resolution
Accuracy
200µA
0.1μA
±（1.5% rdg + 3dgt）
2000µA
1µA
20mA
0.01mA
200mA
0.1mA
10A
0.01A
* Over Load protection：use the fuse(F250mA H 250V) at µA /mA range,
and use the fuse(F10A H 250V) at 10A range.
* Max input current:：250mA at ‘mA’input terminal and 10A at ‘10A’input
terminal.. .
4.2.7 AC Current [40Hz-400Hz]
Range
Resolution
Accuracy
200µA
0.1µA
（1.5% rdg + 4dgt）
2000µA
1µA
20mA
0.01mA
200mA
0.1mA
10A
0.01A
* Over Load protection：use the fuse(F250mA H 250V) at µA /mA range,
and use the fuse(F10A H 250V) at 10A range.
- 10 -
* Max input current:：250mA at ‘mA’input terminal and 10A at ‘10A’input
terminal.. .
4.2.8 Temperature
You can selecting Centi-degree[℃]or Fahrenheit[℉]by “FUNC”key.
Range
-20℃~ 1000℃
Resolution
1℃
-20℃~0℃
（5% rdg + 4dgt）
Accuracy
0℃~400℃
（2% rdg + 3dgt）
400℃~1000℃
（3% rdg + 3dgt）
Fahrenheit Temperature [℉]
Range
0℉~1800℉
Resolution
1℉
-0℉~50℉
（5% rdg + 4dgt）
Accuracy
50℉~750℉
（2% rdg + 3dgt）
750℉~1800℉
（3% rdg + 3dgt）
- 11-

5. Measurement operation
5-1 DC & AC voltage measurement
Warning
To avoid harms to you or damage to the meter from electric
shock. Please do not attempt to measure voltage higher than
DC/AC 1000V although readings may be obtained.
The DC voltage range are 200.0mV, 2.000V, 20.00V , 200.0V and 600V and
then. The AC voltage ranges are 2.000V, 20.00V, 200.0V and 600V.
To measure DC orAC voltage:
1. Insert the red test lead into the “VΩ”input terminal and the black test
lead into the COM terminal.
2. Set the rotary switch to DC orAC range.
3. Connect the test lead across with the object under testing.
The measured value will be show on the LCD display.
Note:
When DC orAC voltage measurement has been completed,
disconnect the connection
between the testing lead and the circuit under testing.
- 12 -
5-2. Resistance measurement
The resistance range are: 200.0Ω, 2.000KΩ,20.00KΩ, 200.0KΩ,
2.000MΩ.
20.00MΩ.
To measure resistance, connect the meter as follows:
1. Insert the red test lead into the ”VΩ”terminal and the black test lead into
the COM terminal.
2. Set the rotary switch to proper resistance range..
3. Connect the test lead across with the object under testing.
The measured value will be show on the LCD display.
Note:
The test lead can add 0.1Ωto 0.2Ωof error to resistance
measurement. To obtain precision reading in low-resistance
measurement, that is the range of 200.0Ω, short the input terminal
before measuring. In this time, the contact resistance displayed on the
LCD. You can subtract the contact resistance value from the measured
value.
For high-resistance measurement (>10MΩ), it is normal taking
several second to obtain stable reading.
The LCD display “OL”indicating open-circuit for the tested resistor
or the resistor value is higher than the maximum range of the meter.
- 13 -

5-3. Diode/Continuity check
①Set the rotary switch to “”position. First time, default
mode is diode check mode. You can enter the continuity check mode
by the “FUNC”Key.
②insert the red test lead into the “VΩ”terminal and the black test lead
into the “COM”terminal.
③Use the diode test mode to check diodes, transistors and other
semiconductor device. In the diode test mode sends a current through
the semiconductor junction, and the measure the voltage drop across
the junction.Agood silicon junction drop between 0.5V and 0.8V.
④For forward voltage drop reading on any semiconductor component,
place the red test lead on the component anode and place the black test
lead on the component cathode. The measured value show on the
display.
⑤Reverse the test lead and measure the voltage across the diode again.
If diode is good, the display shows “OL”.
If diode is shorted, the display shows 0 (zero) in both direction.
If display shows “OL”in both direction, the diode is open.
Continuity Check: Press the “FUNC”key to enter to the continuity
mode.
⑥The buzzer sound if the resistance of a circuit under test is less than
100Ω.
- 14 -
.
NOTE: Input signal level must be higher than 0.5V (it is sensitivity).
5-4. DC/AC µA or mA measurement
DC Current range is 200.0µA/2000µA and 20.00mA,/200.0mA and
then 10A range.
AC Current range is 200.0µA/2000µA and 20.00mA,/200.0mA and
then 10A range.
1. Turn off power to the circuit. Set the rotary switch to the
properDC/AC µA or DC/AC mA position.
2. Break the current path to be tested. Connect the red test lead to the
more positive side of the break and the black test lead to the more
negative side of the break.
3. Turn on power to the circuit. The measured value show on the display.
5-5. DC/AC 10A measurement
1. Insert the red test lead into the input terminal marked as “10A”.
2. The measuring procedure is same as that of 5-5 section..
Note:
For safety’s sake, the measuring time for high current should be
≤10 second for each measurement and the interval time between
two measurement should be greater than 5 minutes.
When current measurement has been completed, disconnect the
connection between the testing lead and the circuit under test.
- 15 -

5-6. Temperature measurement
To measuring temperature shuld be use the K-type probe :P3400.
1. Set the rotary switch to the “TEMP” range. In this time, The
environment temperature value displayed on the LCD.
2. Insert the K-type probe to the two “COM” and “TEMP” terminals.
The two “+”and “-“pins of temperature probe(P3400) must be direct
at the “COM” & “℃”terminal respectively.
3. The measured temperature value will be displayed on the LCD.
5-7. DetectingAC electric field [ NCV function]
The red LED on the upper area on the front panel lights up and then flickering
at all function except for OFF when electric field excceding 90V is detected by
the sensor that is incoporated in the inner upper area of front case.
It indicates a presence of AC voltage in an electrical cricuit or equipment
without touching them, i.e Non Contact Voltage detection(NCV).
Detection against in-wall outlet is possible.
The detecting position may be away about 20mm from the objet under check.
- 16 -
6. Maintenance
6-1. Replacing the battery
When meter display the battery must be replace to maintain
normal operation.
①Disconnect and remove all test probes from any live
source and meter.
②Open the battery cover on the bottom case by
screwdriver.
③Remove old battery and snap new one into battery
holder
6-2. Fuse replacement
Replacing the defective fuse should the done according to the following
procedure.
i. To avoid electrical shock, remove the test lead and any input
signal before opening the bottom case.
ii. Open the botton case and then remove the defective fuse and
insert a new fuse of the same size and rating（F250mA H250V or
F10A H250V）.
iii. Replace the bottom case and reinstall all the screw.