Cojali jaltest Auto Range JT2002 User manual
JT2002
Auto Range Multimeter
User Manual
JT2002
Auto Range Multimeter
User Manual
2
Table of Contents
Title Page
Overview 4
Unpacking Inspection 5
Safety Information 6
Rules For Safe Operation 7
International Electrical Symbols 9
The Meter Structure 10
Rotary Switch 11
Functional Buttons 12
Display Symbols 13
Measurement Operation 15
A. DC/AC Voltage Measurement 15
B. DC/AC Current Measurement 18
C. Measuring Resistance 21
D. Testing for Continuity 24
E. Testing Diodes 26
F. Capacitance Measurement 29
G. Frequency Measurement 32
H. Temperature Measurement 34
Operation of Hold Mode 36
RANGE Button 36
MAX MIN Button 36
JT2002
Auto Range Multimeter
User Manual
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Title Page
The Use of Relative Value Mode 37
The BLUE Button 37
Turning on the Display Backlight 38
Sleep Mode 38
39
40
A. DC Voltage 41
B. AC Voltage 42
C. DC Current 43
D. AC Current 44
E. Resistance 45
F. Capacitance 46
G. Frequency 47
H. Diode Test 48
I. Continuity Test 48
J. Temperature 49
Maintenance 50
A. General Service 50
B. Replacing the Battery 51
C. Replacing the Fuses 53
JT2002
Auto Range Multimeter
User Manual
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This Operating Manual covers information on safety and cautions. Please read the
relevant information carefully and observe all the Warnings and Notes strictly.
⚠Warning
To avoid electric shock or personal injury, read the “Safety Information” and
“Rules for Safety Operation” carefully before using the Meter.”
Digital Multimeter (hereafter referred to as “the Meter”) is an auto ranging
multimeter. The enclosure structure design adopted advanced
The Meter can measure AC/DC Voltage and Current, Resistance, Diode, Continuity,
Buzzer, Capacitance, Frequency, Temperature (°C or °F ).
In addition to the conventional measuring functions, there is data hold, relative
mode, peak measurement, low battery display, display backlight and sleep mode.
Overview
JT2002
Auto Range Multimeter
User Manual
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Open the package case and take out the Meter. Check the following item carefully
to see any missing or damaged part:
immediately.
Unpacking Inspection
Item Description Qty
1 Operating Manual 1 piece
2 Test Lead 1 pair
3 Point Contact K type Temperature Probe 1 piece
4 Multi-Purpose Socket 1 piece
5 9V Battery (NEDA1604, 6F22 or 0006P) (installed inside the Meter) 1 piece
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Auto Range Multimeter
User Manual
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This Meter complies with the standards EN 61010-1,EN 61010-2-030: in pollution
degree 2, overvoltage category (CAT III 1000V, CAT IV 600V) and double insulation.
CAT IV.
CAT IV: Primary supply level, overhead lines, cable systems, etc.
provided by the Meter may be impaired.
the user, or may damage the Meter or the equipment under test.
International electrical symbols used on the Meter and in this Operating Manual
Safety Information
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Auto Range Multimeter
User Manual
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⚠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 rules:
Before using the Meter inspect the case. Do not use the Meter if it is damaged or
the case (or part of the case) is removed. Look for cracks or missing plastic. Pay
attention to the insulation around the connectors.
leads for continuity. Replace damaged test leads with identical model number
Do not apply more than the rated voltage, as marked on the Meter, between the
terminals or between any terminal and grounding.
The rotary switch should be placed in the right position and no changeover of
range shall be made when a measurement is conducted to prevent damage of
the Meter.
When the Meter is working at an efective voltage over 60V in DC or 30V rms in
AC, special care should be taken for there is danger of electric shock.
Rules for safe operation
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Auto Range Multimeter
User Manual
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Do not use or store the Meter in an environment of high temperature, humidity,
Meter may deteriorate after dampened.
Disconnect circuit power and discharge all high-voltage capacitors before
testing resistance, continuity and diodes.
Before measuring current, check the Meterís fuses and turn off the current to be
tested before connecting the Meter to the circuit. After connecting the circuit
reliably, turn the current to be tested on.
Replace the battery as soon as the battery indicator appears.
With a low battery, the Meter might produce false readings that can lead to
electric shock and personal injury.
When servicing the Meter, use only replacement parts with the same model
The internal circuit of the Meter shall not be altered at will to avoid damage of
the Meter and any accident.
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Auto Range Multimeter
User Manual
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Soft cloth and mild detergent should be used to clean the surface of the Meter
after servicing. No abrasive and solvent should be used to prevent the surface of
the Meter from corrosion, damage and accident.
The Meter is suitable for indoor use.
Turn the Meter off when it is not in use and take out the battery when not using
it for a long time.
Constantly check the battery as it may leak when it has not been used for some
time, replace the battery as soon as leaking appears. A leaking battery will
damage the Meter.
International Electrical Symbols
AC or DC Grounding
Double Insulated
Warning. Refer to the
Operating Manual
Conforms to Standards of
European Union
JT2002
Auto Range Multimeter
User Manual
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LCD Display
Functional Buttons
Blue button
Rotary Switch
Input Terminal
The Meter Structure
1
2
4
5
3
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Auto Range Multimeter
User Manual
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Below table indicated for information about the rotary switch positions.
Rotary Switch
AC and DC Voltage Measurement
Resistance Measurement
Diode Test
Continuity test
Capacitance Test
Hz % Frequency and Duty Cycle Test
ºC Temperature in Celsius
ºF Temperature in Fahrenheit
µA DCA and ACA Measurement
mA DCmA and ACmA Measurement
10A 10A DC and AC Measurement
OFF Power off
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Auto Range Multimeter
User Manual
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Below table indicated for information about the functional button operations.
Functional Buttons
Button Operation Performed
LIGHT Press and hold for 2 serconds to turn the display backlight on or off.
Hold
BLUE Button Press to select the alternate feature.
RANGE Press RANGE to enter the manual ranging mode; the Meter beeps.
Press RANGE to step through the ranges available for the selected
function; the Meter beeps.
Press and hold RANGE for 2 seconds to return to autoranging; the
Meter beeps.
MAX/MIN
REL Press to enter REL mode.
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Auto Range Multimeter
User Manual
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Display Symbols
Nº Symbol Meaning
1 Data hold is active.
2 Sleep Mode indicator
3 Indicates negative reading.
4 Indicator for AC measurement
5 Indicator for DC measurement
6 The Meter is in the auto range mode in which the Meter automatically selects
the range with the best resolution.
7 Indicator for manual ranging mode.
8 The input value is too large for the selected range.
9 Test of diode
10 The continuity buzzer is on.
11
12 Data output is in progress
13 The battery is low.
⚠Warning: To avoid false readings, which could lead to possible electric shock
or personal injury, replace the battery as soon as the battery indicator appears.
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Auto Range Multimeter
User Manual
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Nº Symbol Meaning
16 The REL is on to display the stored value minus the present value.
17
Ω, kΩ, MΩ
or 1,000 ohms.
or 1,000,000 ohms.
mV, V
V: Volts. The unit of voltage.
or 0.001 volts.
μA, mA, A
A: Amperes (amps). The unit of current.
or 0.001 amperes
or 0.000001 amperes
nF, μF, mF
F: Farad. The unit of capacitance.
or 0.000001 farads.
or 0.000000001 farads.
ºC, ºF
ºC: Centigrade. The unit of temperature.
ºF: Fahrenheit. The unit of temperature.
Hz, kHz, MHz
Hz: Hertz. The unit of frequency in cycles/second.
or 1,000 hertz.
or 1,000,000 hertz.
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Auto Range Multimeter
User Manual
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Measurement Operation
Select
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Auto Range Multimeter
User Manual
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⚠Warning
To avoid harms to you or damages to the Meter from electric shock, please do
not attempt to measure voltages higher than 1000V although readings may be
obtained.
1. Insert the red test lead into the V terminal and the black test lead into the COM
terminal.
2. Set the rotary switch to V; DC measurement is set by default or press BLUE
button to switch between DC and AC measurement mode.
3. Connect the test leads across two points of the object being measured.
The measured value is shown on the display.
Display effective value of sine wave (mean value response).
Input Amplitude: (DC electric level is zero).
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Auto Range Multimeter
User Manual
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Note
errors in high impedance circuits. If the circuit impedance is less than or equal
When voltage measurement has been completed, disconnect the connection
between the testing leads and the circuit under test, and remove the testing
leads away from the input terminals of the Meter.
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Auto Range Multimeter
User Manual
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Select
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Auto Range Multimeter
User Manual
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⚠Warning
Before connecting the Meter to the return circuit to be tested, cut off the current
of the return circuit.
If the fuse burns out during measurement, the Meter may be damaged or the
operator himself may be hurt.
Use proper terminals, function, and range for the measurement.
When the testing leads are connected to the current terminals, they should not be
in parallel across the circuit.
To measure current, do the following:
1. Insert the red test lead into the mA or A input terminal and the black test lead
into the COM terminal.
3. The Meter defaults to DC current measurement mode. To toggle between DC
and AC current measurement function, press BLUE button.
4. Connect the test lead in series to the return circuit to be tested. The measured
value is shown on the display.
Display effective value of sine wave (mean value response).
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Auto Range Multimeter
User Manual
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Input Amplitude: (DC electric level is zero).
Note
measurement position, and reduce the range step by step until a satisfactory
reading is obtained.
For safety sake, each measurement time for >5A current should be less than 10
seconds and the interval time between 2 measurements should be greater than
15 minutes.
When current measurement has been completed, disconnect the connection
between the testing leads and the circuit under test, and remove the testing
leads away from the input terminals of the Meter.
This manual suits for next models
1
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