Prokit's Industries MT-1232 User Manual

MT-1232

3-3/4 Autorange Digital Multimeter

User’s Manual

1st Edition, 2013

©2013 Copyright by Prokit’s Industries Co., Ltd.

Contents

General------------------------------------------------------------------1
Open-Package Inspection------------------------------------------2
Safety Note -------------------------------------------------------------2
Instrument Panel& Button Function Description---------------5
Other Functions--------------------------------------------------------6
Properties----------------------------------------------------------------6
Instrument Maintenance--------------------------------------------16
Fault Elimination------------------------------------------------------17

General

This product equipped with the LCD display of text height 15mm,
is a 3 3/4 digital multimeter which has the merits of clear reading,
stable performance and high reliability. It could be used to
measure DC voltage, AC voltage, DC current, AC current,
resistance, capacity, frequency/duty cycle, diode and make
on-and-off test. Meanwhile, it is available for unit symbol display,
automatic/manual range switching, automatic power off and
alarm function. The multimeter, due to its complete functions,
performs with high measurement accuracy and convenient
operation,
troubleshooting

and is ideal for general electrical testing and

1

Open-package Inspection

Open the package box and take out the meter, check carefully
if the following accessories are missing or damaged. If there
is anything missing or damaged, please contact the distributor
immediately.
Digital multimeter 1 PC
User’s manual 1 copy
Test leads 1 pair
Temperature Probe (K-Thermocouple) 1 PC
Test Socket 1PC

Safety Note

The design of this meter is in accordance with IEC1010 clause
(the safety standard issued by International Electrotechnical
Commission). Prior to the operation of the instrument, please
read the safety considerations before use.

1. When DC voltage is above 30V, AC voltage above 25V,
current above 10mA, AC power line with inductive load or
power line during electric fluctuation is measured, please
beware of electric shock.

2. Prior to measurement, check if the measurement function
switch is at the correct position. Check if the test lead is
contacted reliably, connected correctly, and grounded well
etc. in order to avoid electric shock.

3. Only if the meter is used with the matched test lead, does it
meet the requirement of the safety standard. When the line
of the test lead is damaged, it is necessary to replace with
another one of the same model or the same electrical
specification.

4. Don’t use other unconfirmed or disapproved fuses to replace
the fuse inside the meter. Only the same model or same

2

specification fuse can be replaced. Before the replacement,
the test leads must be removed from the measuring point
and ensure there is no any signal at the input terminal.

5. Don’t use other unconfirmed or disapproved battery to
replace the battery inside the meter. Only the same model or
same electrical specification battery can be replaced. Before
the replacement, the test lead must be removed from the
measuring point and ensure there is no any signal at the
input terminal.

6. When the electrical measurement is made, never let your
body gets in touch with the ground directly, and don’t touch
uncovered metal terminal, output port, lead clamp and etc.
where earth potential may exist. Dry clothes, rubber shoes,
rubber cushion and other insulating material are usually
used to keep your body insulated against the ground.

7. Don’t store and use it in the high-temperature, high-humidity,
inflammable and strong magnetic field environment.

8. It may damage to the meter and endanger the operator’s
safety if the voltage value beyond the permitted ultimate
voltage value is measured. The ultimate voltage value
permitted for measurement is marked on the instrument
panel, and never measure the value exceeding the standard.
Don’t input the ultimate value out of regulation in order to
avoid electric shock and the damage to the meter.

9. When the test lead is inserted into the current socket, don’t
measure any voltage for fear that the meter should be
damaged and the operator’s safety be endangered.

10. Don’t try calibrating or repairing the meter. When necessary,
only the qualified professional personnel who have had
special training or gained approval can make it.

11. During measurement, the requirement of measurement

3

function must be in accordance with LCD display. Please be
sure to disconnect the line of the test lead with the measured
object first and ensure there is no any input signal. It is
forbidden to switch the function/range selection switch
during measurement

12. When “
battery immediately to ensure the measurement precision.

13. It is not allowed to insert the test lead into the current
terminal to measure voltage!

14. Please don’t change the circuits of the meter freely for fear
that the meter will be damaged and the safety endangered.

15. Description of Safety Symbols

” is shown on LCD display, please replace

Warning!

Insulation

High
Voltage!
Danger!

Ground

Double

Low

Battery

In accordance with the

instruction of European

Trade Union

DCV

ACV

DCA

ACA

Fuse

4

Instrument Panel & Function Button Description

1. Instrument model number

2. LCD Display: Displays the measured data and unit.

3. Function Button

3.1 Hz/% (Frequency/Duty Cycle)
Press this button to select the
frequency or duty cycle mode.
The measurement mode of
voltage/frequency/duty cycle or
current/frequency/duty cycle
could be selected by pressing
this button in AC/DC voltage or
AC/DC current .

3.2 REL (Relative Value

Measurement): The relative value measurement of
Capacitance function could be conducted by pressing this
button

3.3 D/¤ :( Data hold/ Backlight): Press the left side of this

button, the reading is locked; press it again (the left side),
the lock will release and back to normal measurement
status. Press the right side of this button over 3 seconds,
the backlight will come on, press this button(the right side)
again the backlight turns off.

3.4 S: (Function Switch): Press this button, the function could

switch between DC/AC and

4. Knob Switch: Used to change the measurement function and
range.

5. Input Terminals

5.1. Current, Voltage, Diode, Resistance, Capacitance,

Frequency, Buzzer, Temperature “-” Input terminal.

5

5.2.10A“+”input terminal.

5.3. Voltage, Diode, Resistance, Capacitance, Frequency,

Buzzer, Temperature and“+” Input terminal with current
less than 400mA.

Other Functions
Auto Power off

During measurement, the meter will automatically shut down
(enter sleeping mode) to save power if function buttons and
knob switch are not operated for 15 minutes. In auto power off
mode, press any function buttons or rotate the knob switch,
the instrument will get into the auto power on mode (working
mode)

Properties
General Feature

1-1 Display: LCD
1-2 Max Display: 3999(3 3/4) counts automatic polarity display

and unit display
1-3 Measuring Method: Dual integral A/D converter
1-4 Sampling Range: Approx. 3 times / sec.
1-5 Over Range Indication: Display “OL”
1-6 Low Battery Indication: “
1-7 Operation Environment: (0~40)˚C Relative Humidity:<80%
1-8 Storage Environment: (0~50)˚C Relative Humidity:<80%
1-9 Power: 2 pcs 1.5V batteries (“AA” battery)
1-10 Dimension (size): 147×78×41mm
1-11 Weight: Approx. 183g
1-12 Accessories: User’s Manual (1 pc), color box (1 pc), 10A

test leads (1 pair), K-Thermocouple, Test Socket(1 pc)

” symbol appears;

6

Technical Features

2-1. Accuracy: ± (a%× reading +digits),at (23±5)˚C, relative

humidity<75%. One year calibration guarantee from the

time dispatched from the factory.
2-2. Technical Specification

2-2-1. DCV

A) Turn the knob switch to “
B) The default state of the meter is automatic range status,

which shows “AUTO” symbol

C) Put the test lead in contact with the testing point. The voltage

and polarity of the point where the red pen is contacted will be
displayed on the screen.

Caution:

1. Don’t measure voltage over 600V. Otherwise, there is a danger

of the meter being damaged.

2. When measuring high voltage, special attention should be

given to personal safety and avoid your body getting in touch
with high voltage circuit.

Range Accuracy Resolution
400mV 100uV
4V 1mV
40V 10mV
400V
600V ±(1.0%+4d) 1V

• Input Impedance: 400m >40MΩ; 10MΩ at other Ranges.

• Overload Protection: 600V DC or 600V AC Peak Value.

±(0.5%+4d)

“Range

100mV

7

2-2-2. ACV

A) Insert black test lead into the hole of “COM” and red test

lead into “
B) Rotate function switch to “

select the AC measurement mode.
C) The default state of the meter is in automatic range status,

which shows “AUTO” symbol
D) Put the test lead in contact with the testing point. The voltage

of the point where the red test lead is contacted will be

displayed on the screen.

Caution:

1. Don’t measure voltage over 600V. ; Otherwise, the meter will

be damaged.

2. When measuring high voltage, special attention should be

given to personal safety and avoid your body getting in touch

with high voltage circuit.

Range Accuracy Resolution
4V 1mV
40V 10mV
400V
600V ±(1.0%+6d) 1V

• Input Impedance: >10MΩ

• Overload Protection: 600V DC or 600V AC Peak Value

• Frequency Response: (50~200) Hz

• Display: Average value response (RMS of sine wave).

“

“, press “SELECT” button to

±(0.8%+6d)

100mV

8

2-2-3. DCA

A) Insert the black test lead into the “COM” input terminal and

red test lead into the “

or 10A input terminal (Max 10A).
B) Rotate function switch to Current. The default state of the

meter is in automatic range status, which shows “DC”

symbol. Then connect the test lead to the tested circuit in

series, the tested current value and the current polarity of

the point where the red pen is contacted will be displayed on

the screen simultaneously.

Caution:

1. If “OL” is displayed on LCD, it indicates the tested current

value has exceeded the present range limit, please select

higher range to complete the measurement.

2. The Max input value is 400mA or 10A. (Depending on the

terminal where the red test lead is contacted)

Range Accuracy Resolution
400uA 0.1uA
4000uA 1uA
40mA 10uA
400mA
10A ±(1.2%+10d) 10mA

• Max measurement voltage drop: Full Range mA is 0.4V, A is

100mV;

• Max input current: 10A (less than 15 seconds);

• Overload Protection: 0.4A/250V restorable fuse, 10A/250V

fuse.

±(1.0%+10d)

“input terminal. (Max 400mA),

100uA

9