Pro's Kit MT-2018 User manual

MT-2018
Protective Function Analog Multimeter
User’s Manual
2st Edition,2018
© 2018 Copyright by Prokit’s Industries Co., Ltd.

1
INTRODUCTION
This Multi-meter is an accurate, safe, battery operated, rear
tilt-stand, easy to operate handheld instrument with robust
protective holster alongside and the adjustable back tilt device
with hook-up design. It can offer accurate, reliable measurement
of DC/AC Voltage, DC Current, Resistance and Diode, LED,
Transistor, Decibels, and Capacitance with very high sensitive
quality movement, and good-designed circuit, as well as mirrored
Aluminum dial plate etc. It has the perfect full overload &
miss-used protection via Fuses, Oxide Varactor & Diodes. It is an
ideal instrument for indoor use in the laboratory, school, workshop,
hobby and home applications.
SPECIFICATIONS
Safety Category: IEC61010-1, CAT II 1000V, CAT III 500V and
Pollution Degree 2.
Common Environment: 23C5C, less than 75% RH.
Temperature Ranges:
0C to 40C, 32 F to 104 F for Operating condition.
-10 C to 50C, 14 F to 122F for Storage condition.
Humidity Scope: Operating condition less than 90% RH.
Storage condition: less than 80% RH.
Size: 160(W) x 105(D)x 40(H) MM
Weight: 390g approx. (including batteries 3pcs)
Accessories: One set of Test Leads; One Spare Fuse: 0.5A/250V,

2
Test
Functions
Range
Accuracy
Remarks
DC V
0-0.1-0.5-2.5-10-50
-250 V
-1000V
3% FSD.
4% FSD. For
1000V
Input Impendence:
20KΩ/V
Overload Protection:
Max. 1000V AC/DC
BUT 0.1V/0.5V/
2.5V/10V/50V /250V
Max.
AC V
0-10-50-250V
-1000V
4% FSD.
5% FSD. For
1000V
Input Impendence:
9KΩ/V
Overload Protection:
Max. 1000V AC/DC
But 10V/50V only
250V Max. Band
width: 40 ~10K Hz
DC mA
0-0.05-2.5-25-
250 mA,
3% FSD.
Drop Voltage: 250mV
Overload protected by
Fuses 0.5A/250V, and
Oxide Varactor.
<250V AC/DC(5s).
Ω
X1: 0.2 ~ 2KΩ
midscale at 20Ω
X10: 2~20KΩ
Midscale at 200Ω
X100:20~200KΩ
Midscale at 2000Ω
X1K: 200~ 2MΩ
Midscale at 20KΩ
X10K: 2K ~ 20MΩ
Midscale at 200KΩ
4% of ARC of
Scale Length
Overload protected by
the Oxide Varactor &
Fuse <250V
AC/DC(5s).
Capacitan
ce (uF)
2000uF
Approximate
Value
Use the ΩX 1K range
BATT
Check
0 ~ 1.5V: GOOD - ?
–BAD
0 ~ 9V: GOOD - ? –
BAD
5% of ARC of
Scale Length
Load Current:
270mA for 1.5V,
25mA for 9V.
Overload protected by
Fuse & Oxide
Varactor .<250V
AC/DC(5s).

3
Transistor
Check
hFE: 0-1000 via
special hFE socket
Approximate
Value
At Ω X 10 Range
LED,
Diode
Check
via special hFE
socket
Approximate
Value
At Ω X 10 Range
Decibel
-22 dB ~ + 62 dB
(0dB=1mW at
600Ω)
Approximate
Value
At ACV ranges
Power
Source
Internal Battery:
R03, AAA, 1.5V
2pcs, 6F22,
NEDA1604, 9V 1pc
CALIBRATION
ΩZero Adjustor located at the right side of the panel, adjusting
the meter pointer to the Zero mark on the right side of Ωscale
of the meter dial when the test leads are touched together.
MechanicalAdjustor Screw: located right below the center of
the meter dial to set pointer to Zero mark at the left side of the
scale.
(-) Jack: Plug-in connector at the lower left on the panel for
Black, negative test lead.
(+) Jack: Plug-in connector at the lower right on the panel for
Red, positive test lead.

4
OPERATING INSTRUCTIONS
CAUTION
When making voltage or current measurements, develop the
habit of turning off all power to the circuit under test. Connect
the test leads at the desired points in the circuit, then turn on
the power while taking readings. Turn off the power before
disconnecting the test leads from the circuit.
INTERNAL BATTERY CHECK
To check the battery condition, insert the black test lead into the
(-) jack. Set the range switch to the ΩX1 range position and
short the ends of the two sides of the test leads. If the pointer
can not be brought to the zero mark, replace the 1.5V cells or
9V cell. (See battery replacement.)
BEFORE OPERATING
1. Set the range switch to the proper position before making
any measurement.
2. Never apply more voltage or current than the rated value in
every position.
3. When the voltage or current to be measured it not known,
always start with the highest range.
4. If meter indication is in the lower half of the scale and falls
within the range of a lower scale, reset selector switch to the
lower range for greatest accuracy.
5. If the meter won’t wotk at all, check the fuse located on the
PCB. If it’s blown, replace it. (See fuse replacement.)
6. Avoid placing the meter where extreme shock or continuous
vibration is encountered and do not store in excessively hot
or damp places. Although very rugged, the meter is a
sensitive measuring device and should be handled carefully
& properly.
7. Do not check resistance, transistor, diode, LED, or
capacitance when live voltage or current input across the
circuit.

5
8. When the meter is not in use, keep the selector switch to the
“OFF” range position, this provides direct short across meter
movement for minimum needle bounce when transporting
meter.
9. If you should accidentally apply excessive voltage or current
on a certain range, disconnect the leads from the circuot as
quickly as possible, check instrument operation on that range
by applying peoper input. If the meter does not operate
peoperly, check fuse. If it is blown replace it. (See fuse
replacement.)
OPERATION PROCEDURES
DC Voltage Measurement
WARNING: WITH EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HUGH VOLTAGE, AND DO NOT
TOUCH TERMINAL OR PROBE ENDS.
1. Set the selector switch to the appropriate DCV range to be
used.
2. Connect the BLACK test lead to the “-COM” jack and the RED
test lead to the “+” jack.
3. If you know the polarity of the circuit to be tested, connect the
black probe to the negative side.
4. If you don’t know the polarity, connect the probes to opposite
sides of the circuit and watch the pointer. If it goes to the left,
reverse the probes. The RED probe will be connected to the
positive.
5. Check the needle position and the get the reading on V.Ascale.
AC Voltage Measurement
WARNING: WITH EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HUGH VOLTAGE, AND DO NOT
TOUCH TERMINAL OR PROBE ENDS.
1. Set the selector switch to the appropriateACV range to be used
and connect the test leads across the circuit or load under
measurement. (Polarity of the test probes is unimportant on
ACV test.)

6
2. Connect the BLACK test lead to the “-COM” jack and the RED
test lead to the“+” jack.
3. Check the needle position and the get the reading on V.Ascale.
DC Current Measurement
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE RANGE SWITCH IS IN CURRENT
POSITION DO NOT ATTEMPT TO MEASURE AC CURRENT.
1. Set the selector switch to the appropriate DC mA range to be
used and connect the test leads in series with the circuit or the
load under measurement. If the pointer deflects to the left,
reverse the probes.
2. Connect the BLACK test lead to the “-COM” jack and the RED
test lead to the Red “+” jack for Current at/less than 0.25A.
3. Check the needle position and the get the reading on V.Ascale.
Note:
Excessive current input across mA range will blow the fuse
that must be replaced by a same fuse rating 0.5A/250V.
Note: If connected incorrectly with the voltage at these
ranges, quickly remove the test leads from the circuit and can
avoid the damage to this tester..
(This tester can afford the voltage <250V DC/AC rms. for the
period of 5 seconds max.)
Resistance Measurement
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.
1. Set the selector switch to the appropriate Ωrange to be used.
2. Connect the BLACK test lead to the “-COM” jack and the RED
test lead to the Red “+” jack.
3. Short the leads by touching the probes together. Pointer should
read zero at the right hand end of the uppermost scale, if it
doesn’t, use the 0Ωadjust knob on the right hand of the panel
to line up the pointer with zero. (If pointer can’t be brought to
zero, replace battery.)
4. Connect the test leads across the resistance to be measured.

7
5. Take reading on the top “Ω” scale and multiply it by the
multiplication factor indicated by the selector switch.
6. If there is little or no pointer movement from the left side of the
scale, reset the selector switch to higher range. The effective
reading scope on an Ωmeter scale is within the area of
between 25 degree ofArc left side to the Midscale and 25
degree right side to the Midscale.
Note: If connected incorrectly with the voltage, quickly
remove the test leads from the circuit as to avoid the damage
to this tester. (This tester can afford the voltage <250V DC/AC
rms. for the period of 5 seconds max.)
Diode Measurement
Set the selector switch to the appropriate Ωrange to be
used.
NOTE: To test the diode while current below 0.060 mA at X
10K range; current below 0.15 mAat X 1K range; current
below 1.5 mA at X 100 range; current below 15 mA at X 10
range; current below 150 mAat X 1 range.
For IF (forward current) test
Put the BLACK test lead to the “-COM” jack and the RED test
lead to the Red “+” jack. And then connect the Black probe to
the Positive terminal of the Diode, the Red probe to the
Negative terminal of the Diode.
For IR (reverse current) test,
Reverse the connection.
1.Read the value IF or IR of the diode on the LI scale.
2.Read the linear (forward voltage) VF of the diode on the LV
scale.
Transistor hFE and LED Test
Set the selector switch to the ΩX 10 range.
For Measuring Transistor hFE
1. Take note the type of transistor “PNP” or “NPN” and then
insert the transistor terminals of the Emitter, Base and
Collector separately into the proper holes of the socket on
the front panel.
1. Read the approximate hFE Value directly at the hFE scale.

8
Note: Current 10μA. VCE 2.8V.
2. When the Base terminal cut, the value of Leak is Iceo for
Transistor.
For Measuring LED
Insert the transistor terminals directly into the “+” and “-”
holes of the socket on the front panel.
And then check if the LED under testing is lighting.
Battery Check
1.This meter can come with two separate battery check ranges
to test either DC 1.5V or 9V batteries.
2.Set the selector switch to the appropriate BATT range to be
used.
3.Connect the BLACK test lead to the “-COM” jack and the
RED test lead to the Red “+” jack.
4.Connect the Red test lead to the positive end of battery and
the Black one to the negative end of the battery to be
measured.
5.Take reading on the “BATT” scale and check it good or bad
as per which portion indicated.
(Note: the mark section of “?” shows that the battery may be
starting to decay.)
Note: If connected incorrectly with the voltage, quickly
remove the test leads from the circuit as to avoid the damage
to this tester.
(This tester can afford the voltage <250V DC/AC rms. for the
period of 5 seconds max.)

9
Decibels Measurement
1. Set the selector switch toAC 10V range.
2. Connect the BLACK test lead to the “-COM” jack and the
RED test lead to the “Output” jack.
3. Connect the test leads to the measuring circuit, and then
read the bottom Red dB scale.
4. For more dB scope, change the selector switch to the others
of ACV ranges and make the same actions. Add the
appropriate number of dB scale reading as noted on the
chart below.
Note: For absolute dB measurements, circuit impedance
must be 600 Ohm. 0 dB = 1mw dissipated in a 600 Ohm
impedance (equivalent to 0.755V across 600 Ohm)
ACV RANGE
ADD dB Number
50
14
250
28
1000
40
Capacitance Measurement
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE MAKING ANY CAPACITANCE
MEASUREMENTS.
BEFORE TESTING ANY CAPACITORS, DISCHARGE THE
CAPACITOR COMPLETELY.
1) Set the selector switch to the ΩX 1K range.
2) Connect the BLACK test lead to the “-COM” jack and the
RED test lead to the Red “+” jack.
3) Connect the test leads to the capacitor to be measured
(Note the polarity of capacitor).
4) Watch the needle deflection to the right topside, and read
the Red C scale on the Dial.