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

2

3

6

7

8

4

5

4

Fig. 1 Exterior view

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① LCD display
② “MAX” push button
③ “BACK LIGHT” push button
④ ‘HOLD” push button
⑤ “FUNC” Push button
⑥ Rotary Switch (Knob)
⑦ “V/Ω/uA/mA/℃”Input terminal
⑧ “COM” input terminal

⑨ “10A” input terminal
⑩ NCV indicator [LED]

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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.

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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

Ω KΩ MΩ is 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

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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

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● 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 (L x 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）

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* Over load protection: SG(Spark Gap) used to protect that the voltage
overred 1500V

4.2.2 AC 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

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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.

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* 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）

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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 or AC 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 or AC 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 or AC voltage measurement has been completed,

disconnect the connection

between the testing lead and the circuit under testing.

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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 0.1Ω to 0.2 Ω of 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.

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5-3. Diode/Continuity check

① Set the rotary switch to “ ” position. First time, default

mode is diode check mode. You can enter the continuity check mode
by the “ FUNC” Key.

② insert the red test lead into the “VΩ” terminal and the black test lead

into the “COM” terminal.

③ Use 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. A good silicon junction drop between 0.5V and 0.8V.

④ For 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.

⑤ Reverse 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.

⑥ The buzzer sound if the resistance of a circuit under test is less than

100Ω.

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.
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.

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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. Detecting AC 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.

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6. Maintenance

6-1. Replacing the battery

When meter display the battery must be replace to maintain
normal operation.

① Disconnect and remove all test probes from any live

source and meter.

② Open the battery cover on the bottom case by

screwdriver.

③ Remove 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.

6-3. Test lead replacement

The test lead has been used and replaced shall be comply with the requirements
specified by the manufacturer in order to ensure operation safety,(1000v CATII or
600V CAT III 10 A or better)

warning TO AVOID ELECTRICAL SHOCK, REMOVE TEST LEADS BEFORE OPENING

BATTERY COVER.

RISQUE DE CHOC ÉLECTRIQUE, RETIRER CORDONS DE MESURE D'OUVERTURE AVANT

couvercle des piles.

6-4.Cleaning and Decontamination

The meter can be cleaned with soft clean cloth to remove any oil, grease or
grim.
Do not use liquid solvent or detergent.

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