Prokit's Industries MT-1860 User Manual
Professional Digital
Multimeter
DC
AUTO
APO
MAX/MIN Hz/DUTY H
AUTO POWER OFF
POWE
R
C
A
/
C
D
m
A
10A
mA
10A
10sec MAX
FUSED
Ω
600mA
FUSED
MAX
OLD RANGE
H
z
/
C
˚/
F
˚
A
COM
CAT ll
REL/RS232
TEMP
VΩ Hz
MAX
1000V D
750V
V
C
AC
MT-1860
U s e r ’ s M a n u a l
Contents
General 2
Open-package Inspection 2
Safety Note 2
Description of Safety Symbols 3
Description of Instrument Panel and Push button Functions 4
Other Functions 5
Property 5
DC Voltage (DCV) 6
AC Voltage (ACV) 7
DC Current (DCA) 8
AC Current (ACA) 10
Resistance 11
Diode and On-and-Off Test 12
Capacitance (C) 13
Temperature Measurement 14
Communication Connection 15
Instrument Maintenance 16
1
General
MT-1860 endowed with the key touching function instead of the traditional mechanical
knobs, is a new type of 3 5/6 digital multimeter equipped with the LCD display device
with the text height of 33mm which has the merits of visual display, easy operation, stable
performance and high reliability. It can be used to measure DC voltage, AC voltage, DC
current, AC current, resistance, capacitance, frequency, temperature, diode and make
on-and-off test. Meanwhile, it is available for unit symbol display, data retention, the mea-
surement of maximum and minimum value, automatic/manual range switching, automatic
power off and alarm function. The complete machine takes a switching integrated circuit
which can directly drive LCD microprocessor and double-integrating A/D and a digital
display drive offering high resolution and high precision. Due to it’s complete functions,
high measurement accuracy and convenient operation, the multimeter is the ideal tool in
laboratory and factory as well as for radio fans and family.
Open-package Inspection
Open the package box and take out the meter, check carefully if the following accessories
are absent or damaged. If there is any absence or damage, please contact the distributor
immediately.
Digital Multimeter 1 PC
Instruction Manual 1 copy
Test Leads 1 pair
Temperature Probe (K-Thermocouple) 1 PC
PC Interface Cable 1 PC
Software Disk 1 PC
Holster 1 PC
Safety Note
In accordance with IEC1010 clause (the safety standard issued by International Elec-
trotechnical Commission), MT-1860 is designed and produced according to the safety
requirements of pollution level II.
Warning:
In order to avoid endangering the operator’s safety, prior to the operation of the instru-
ment, please read the instruction manual carefully, and conform to the safety warning
information and operation instruction strictly to use the instrument.
1. When voltage above 30V, current above 10mA, AC power line with inductive load or
power line during electric uctuation is measured, please beware of electric shock.
2. Prior to measurement, check if the measurement function is in conformity with the
2
LCD display, and if the push button switch is at the trigger position. Check if the
meter pen is contacted reliably, connected correctly, and grounded well and etc. In
order to avoid electric shock.
3. Only if the meter is used with the matched meter pen, can it meet the requirement
of safety standard. When the line of the meter pen is damaged, it is necessary to
replace another one of the same model or the same electrical specication.
4. Don’t use other unconrmed or disapproved protector tube to replace the protector
tube inside the meter. Only the protector tube of the same model or same specica-
tion can be replaced. Before the replacement, the meter pen must leave the measur-
ing point and ensure there is no any signal at the input terminal.
5. Don’t use other unconrmed or disapproved battery to replace the battery inside the
meter. Only the battery of the same model or same electrical specication can be
replaced. Before the replacement, the meter pen must leave 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 get 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, inammable and strong
magnetic eld environment.
8. It may do 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 meter pen 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 it is indeed necessary for that, only
the qualied professional personnel who have had special training or gained approval
can make it.
11. During measurement, the requirement of measurement function must be in accor-
dance with LCD display. Please be sure to disconnect the line of the meter pen with
the measured object rst and ensure there is no any input signal. It is forbidden to
switch the function/range selection switch during measurement
12. When “ ” is shown on LCD display, please replace battery immediately to
ensure the measurement precision.
13. It is not allowed to insert the meter pen into the current terminal to measure voltage!
3
14. Please don’t change the circuits of the meter freely for fear that the meter be dam-
aged and the safety be endangered.
Description of Safety Symbols
Warning! Battery Under voltage
High Voltage! Danger! AC/DC
Ground In accordance with the instructions
of European Trade Union
Double Insulation Fuse
Description of Instrument Panel and Push button Functions
1. Instrument model.
2. LCD display area.
3. Function button: Used to select various
measurement functions.
3-1 “Hold” backlight switch and reading-keeping
switch. If the switch is pressed over 2 seconds,
the backlight turns on. Further press the switch
over 2 seconds, the backlight turns off or
automatically turns off after 10 seconds.
Pressing the switch within 2 seconds could lock
or unlock the data retention. Press the switch
once to lock and press it again to unlock.
3-2 Hz/DUTY: Press the key in the gear of
frequency can switch between the frequency
and the Duty Cycle.Press the key in the gear
of AC Voltage or AC Current can switch among
1
DC
2
3-1
AUTO
APO
3-2
3-3 3-4
MAX/MI
4
POWE
4
6
7
10A
8
9
N H
R
z/DUT
Y HOLD RANGE
AUTO POWER OFF
C
A
/
C
D
Ω
m
A
mA
MAX
600mA
FUSED
10A
X
10sec MA
FUSED
V
REL/RS232
H
z
/
C
˚/
F
˚
A
TEMP
VΩ Hz
COM
MAX
1000V DC
750V AC
T ll
CA
the voltage, current, frequency and duty cycle.
3-3 MAX/MIN: The maximum value and minimum value.
Press the function button and enter MAX mode, in which the maximum value is held;
press the button again to enter MIN mode, in which the minimum value is held. After
the MAX/MIN mode is entered, the display device indicates the MAX/MIN value. No
analog bar display and auto power off function in this working environment. Press
4
3-5
down MAX/MIN button for 2 seconds, and then exit from MAX or MIN test.
3-4 Range: Automatic/Manual Range Switch. Pre-set it to automatic range when the
device starts up, then switch it to manual range. In the mode of manual range, press
the “RANGE” button once, it will skip to the previous shift. When it goes to the highest
shift, it goes back to the lowest shift when the button is pressed again. The procedure
repeats again in the same order. Press the button over 2 seconds, it will exit from
manual range and enter the state of automatic range measurement.
3-5 REL: Relative Value Measurement. Press this key to show the relative value
measurement, press again to cancel the relative value measurement. The procedure
repeats in the same order. Press this key over 2 seconds, it will switch to RS232,
which can be showed on the LCD screen and the RS232 data transmission is thus
open. Further press the key over 2 seconds, the RS232 icon disappears on the LCD
screen. Now the RS232 data transmission terminates. The procedure repeats.
4. “POWER” is the power switch.
5. Function Selection Button.
6. Input Port: Measure the positive input terminal of voltage, frequency, re-
sistance, capacitance, diode as well as on-and-off test, and insert red meter pen.
7. 10A current input jack: Measure the positive input terminal of 10A shift AC/DC
current, and insert red meter pen.
8. mA input port: Measure the positive input terminal of AC/DC.
9. COM input port: Measure the negative input terminal, and insert black meter
pen.
Other Functions
1. Automatic power off
After the meter is stopped for 15 minutes, it will cut off power automatically (power off),
and then enter the dormant (power off) state. The built-in buzzer will send out warning
tone in one minute before it powers off. If you want to restart power (power on), please
press the power switch. If you want to cancel automatic power-off, please press “REL”
key over 2 seconds until the RS232 symbol appears. Meanwhile the “APO” symbol will
be also turned off.
Property
1. General features
1-1. Display mode: LCD
1-2. Maximum display: 5999.3 5/6 display automatic polarity display and unit display.
5
1-3. Analog bar. 30 times/sec, display of 61 analog bars.
1-4. Measurement mode: dual integration A/D conversion.
1-5. Sampling rate: About 3 time/sec.
1-6. Over range: Display “OL”
1-7. Low voltage display: about 2.4v, the symbol displayed.
1-8. Working temperature: 0~40˚C
1-9. Storage temperature: -10~50˚C, relative humidity <80%
1-10. Power: Two 1.5v batteries (“AAA” batteries)
1-11. Volume (Dimensions): 185mm×91mm×49mm (Length x width x height)
1-12. Weight: About 410g (including battery )
2.Technical features
2-1. Accuracy: ±(a% reading + d digits), the ambient temperature for ensuring accuracy:
23±5˚C, relative humidity <75%.
2-2. The warranty period of calibration is one year from ex-factory date.
DC Voltage (DCV)
1. Press “AC/DC”, select automatic measurement of DC voltage., and respectively plug
in the red and black meter pens into the terminals of “VΩHz” and “COM”, as shown in
the following diagram.
2. The initial state of the meter is the DC voltage automatic measurement mode, which
shows the symbols of “DC” “AUTO” “APO”. Press “RANGE” is to select manual range
mode; Press “MAX/MIN” once to show the Max measurement value. Press “MAX/MIN”
again to show the Min measurement value. Press “MAX/MIN” over 2 seconds is to
cancel the measurement of the MAX/MIN value.
3. Touch the measuring point with the meter measuring pen and connect it in parallel to
the circuit being tested, and the polarity of the red meter pen wire and the tested volt-
age value are spontaneously displayed on the display.
Caution:
a) Voltages over DC1000V or AC750V cannot be tested.
b) When measuring high voltages, special precautions must be taken to avoid
electrical shock. When measurement is completed, immediately disconnect the meter
pen and the measured circuit.
c) In case “OL” is displayed for manual range mode, it indicated the range has been
exceeded and it is necessary to select higher range mode to complete this measure-
ment.
6
Voltage
switch
DC
AUT
O
APO
MAX/MIN Hz/DUTY HOLD RANGE
AUTO POWER OFF
POWE
R
C
A
/
C
D
Ω
m
A
10A
mA
MAX
600mA
FUSED
A
10
10sec MAX
FUSED
V
REL/RS232
H
z
/
C
˚
/
F
˚
A
TEMP
VΩ Hz
COM
MAX
1000V DC
750V AC
CA
T ll
Range Accuracy Resolution
600mV
6V 1mV
60V 10mV
±(0.5%+4d)
0.1mV
600V 100mV
1000V ±(1.0%+4d) 1V
• Input impedance: 600mV range>60MΩ, the others are 10MΩ. Overload protection:
1000VDC or 750V alternative peak.
AC Voltage (ACV)
y
1. Circularly press the “AC/DC” key until
it selects the AC Voltage automatic
measurement mode. Meanwhile, the
symbol “AC”,“AUTO”,“APO” will appear
on the LCD. Respectively plug in the
red and black meter pens into the terminals
TEMP
of “
” and “com”. See the picture re below.
VΩ H
2. The initial state of the meter is automatic range,
z
which shows “AUTO” symbol. Press the “Range” key and switch it to manual range
mode. In the AC mode of automatic/manual range, the frequency/ duty cycle can be
measured by pressing “Hz/DUTY”. However, the frequency response now is low ,
which is suitable for the measurement of high voltage and low frequency in the envi-
ronment of magnetic eld interference such as 220V/50Hz-400Hz,380V/50Hz-400Hz.
Voltage
switch
DC
AUTO
APO
MAX/MIN Hz/DUTY HOLD RANGE
AUT
O POWER OF
POWER
C
A
/
C
D
Ω
m
A
10A
mA
MAX
600mA
FUSED
10A
10sec MAX
D
FUSE
V
F
REL/RS232
H
z
/
C
˚
/
F
˚
A
TEMP
VΩ Hz
COM
MAX
1000V DC
750V AC
T ll
CA
V~
Caution:
Voltages over DC1000V or AC750V cannot be tested. In case “OL” is displayed for
manual range mode, it indicated the range has been exceeded and it is necessary to
select higher range mode to complete this measurement.
Range Accuracy Resolution
6V
60V 10mV
±(0.8%+10d)
600V 100mV
750V ±(1.0%+6d) 1V
1mV
X
60Hz
7
• Input impedance: 10MΩ.
• Overload protection: 1000VDC or 750V alternating peak.
• Display: Mean value response (calibrated with sine wave).
• Frequency response: (40-400)Hz.
• Duty Cycle Display: (0.1%-99.9%).
DC Current (DCA)
1. Press the “ mA “ button or “ A “ button.
Plug the black meter pen into the terminal of
“COM” and the red meter pen into the terminal
of “mA” or “10A”. See the picture below.
2. Circularly press the “ mA “ button or
“ A “ button. Select automatic DC 600mA
and 10A current to test. The “DC”,“AUTO”,
DC
V
AUTO
APO
MAX/MIN Hz/DUTY HOLD RANGE
mA
AUTO POWER OFF
R
POWE
REL/RS232
H
C
z
/
A
C
/
˚
C
/
F˚
D
Ω
m
A
A
TEMP
A
10
z
VΩ H
mA
COM
MAX
MAX
600mA
1000V DC
FUSED
10A
750V AC
10sec MAX
FUSED
CAT ll
“APO” symbols will appear on the LCD screen.
3. In case “OL” is displayed on the display, it indicates the current being measured has
exceed the current range, and please select higher ranges for measurements.
Caution:
a) At the 10A mode, current bigger than 10A
cannot be measured, and at mA mode,
the current bigger than 600 mA cannot be
measured. Otherwise this will lead to the
burning of the fuse or damage the instrument.
b) When the meter pen is plugged in the
input terminal of the current, it is strictly
A
switch
DC
AUTO
APO
MAX/MIN Hz/DUTY HOLD RANGE
AUTO POWER OFF
POWER
H
C
/
A
C
D
Ω
m
A
A
10
mA
MAX
600mA
FUSED
10A
10sec MAX
FUSED
V
REL/RS232
z
/
C
/
F
˚
˚
A
TEMP
z
VΩ H
COM
MAX
1000V DC
750V AC
CAT ll
prohibited to have the meter pen connected
in parallel on any circuits.
Range Accuracy Resolution
60mA
600mA 100μA
6A
10A 10mA
±(1.0%+10d)
±(1.2%+10d)
10μA
1mA
• The maximum input current: 10A (not exceeding 15s))
• Overload protection: 0.6A/250V fuse; 10A/250V fuse.
8
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