Cojali JT2007 User manual

JT2007
Pen Type Multimeter
Operating Manual
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure (see gure 1)
Display Symbols (see gure 2)
This Operating Manual covers information on safety and
cautions. Please read the relevant information carefully and
observe all the Warnings and Notes strictly.
Open the package case and take out the Meter. Check the
following items carefully to check if there is any missing or
damaged part:
This Meter complies with standards EN61010: in pollution
degree 2, overvoltage category (CATIII 300V) and double
insulation. CATIII: Distribution level, xed installation, with
smaller transient over voltages than CAT IV. Use the Meter
only as specied in this operating manual. Otherwise, the
protection provided by the Meter may be impaired.
In this manual, a Warning indicates conditions and actions
that pose hazards to the user, or may damage the Meter or
the equipment under test.
A Note indicates the information to which the user should
pay attention on.
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:
In the event that there is any missing or damage, please
contact your dealer immediately.
AC/DC voltage
EF Function
Resistance
Diode
Continuity
Capacitance
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.
Inspect the test leads for damaged insulation or exposed
metal parts. Check the test leads for continuity. Replace
the damaged test leads with identical model number or
electrical specications before using the Meter.
When using the test leads, keep your ngers behind the
nger guards.
Do not apply more than the rated voltage, as marked
on the Meter, between the terminals or between any
terminal and grounding.
When the Meter is working at an effective voltage over
60V DC or 30V AC, special care should be taken because
there is a danger of electric shock.
Use the proper function and range for your
measurements.
Disconnect the circuit power and discharge all high
voltage capacitors before testing current, resistance,
diodes or continuity.
Replace the battery as soon as the battery indicator
appears. With a low battery, the Meter might take false
readings that can lead to an electric shock and personal
injury.
When servicing the Meter, use only the same model or
identical electrical specications replacement parts.
The internal circuit of the Meter shall not be altered at will,
in order to avoid damage of the Meter and any accident.
Soft cloth and mild detergent should be used to clean
the surface of the Meter when servicing. No abrasives
and solvents should be used to prevent the surface of the
Meter from corrosion, damage and accident.
Do not use or store the Meter in an a humid, hot,
explosive, inammable place or with a strong magnetic
eld. The performance of the Meter may be deteriorated
after being dampened.
⚠Warning:
1. Front Housing
Figure 1
3. Switch
5. Input Terminals
2. Functional buttons
4. LCD Display
⚠Warning:
Functional buttons and auto power off
Press SELECT to switch between resistance, AC/DC voltage,
continuity buzzer and diode measurement modes. Press
and hold the button for more than 2 seconds to enter in or
exit “sleep” mode.
1. SELECT
To preserve battery life, the Meter automatically enters the
“sleep” mode if you do not press any button for around
10 minutes. The Meter can be activated by pressing any
button, then it returns to the display of the function selected
previously.
5. AUTO POWER OFF
To avoid electric shock or personal injury, read the “Safety
Information” and “Rules for Safe Operation” carefully before
using the Meter.
The Model JT2007 Pen Type (hereafter referred as “the
Meter”) are 3,000 counts. The Meter uses a large scale of
integrated circuits with professional multimeter IC as its
core, and has a full range overload protection.
The Meter measures or tests the following:
Item Description Qty
1 English Operating Manual 1 piece
1 Test Lead 1 pair
Deciency of Built-In Battery
Grounding
AC (Alternative Current)
DC (Direct Current)
Double Insulated
Continuity Test
AC or DC
Diode
Conforms to Standards of European Union
⚠Warning. Refer to the Operating Manual
1. Indicates auto scan mode.
2. High voltage indicator.
3Data hold is activated.
4. Indicates negative reading.
5. The meter is in the autorange mode.
6. Indicator for AC voltage.
7. Indicator for DC voltage.
8. 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.
9. Minimum reading.
10. Maximum reading.
11. The unit of Capacitance.
12. Test of diode.
13. The continuity buzzer is on.
14. V : Volts. The unit of voltage.
mV : Millivolt. 1x10 or 0.001 volts.
15. Ω: Ohm. The unit of resistance.
kΩ : kilohm. 1x10 or 1000 ohms.
MΩ: Megaohm. 1x10 or 1,000,000 ohms.
Figure 2
Press HOLD to enter or exit hold mode (except in the auto
scan mode). Press and hold the HOLD button for more than
2 seconds, the meter will automatically holds the value
which is obtained 6 seconds later. At this time, is displayed
and starts ashing.
If it enters in the “sleep” mode while it is in the hold mode,
the meter will still be in the hold mode when it is turned on.
2. HOLD
The MAX/MIN mode stores the minimum (MIN) and
maximum (MAX) input values (except in the auto scan
mode). Manual ranging occurs when you select this
function.
Press MAX/MIN button MAX MIN MAX/MIN and vice
versa.
In the hold mode and max/min mode, you should exit the
hold mode rst, then press and hold MAX/MIN for more
than 1 second to exit the max/min mode.
3. MAX/MIN
Display Backlight and test lead light button. Press the
button once to turn the display backlight and the test lead
light on and press again to turn the display backlight and
test lead light off. It will be automatically turned off after
approx. 1 minute.
4.
Measurement Operation
The buzzer sounds every time the button is effectively
pressed. When the meter will auto power off in 20 seconds,
the buzzer beeps three times. Before powering off, there will
be a long time buzzer beeps.
Before measurement, turn anticlockwise the blue cover and
rock the input terminal.
When all the measurement has been completed, turn
clockwise the blue cover and then hide the input terminal
(see gure 3).
Figure 3
6. BUZZER
⚠ Warning
To avoid harm to the Meter, never input higher than 300V
voltage, although it is possible to measure higher voltage.
To measure Voltage, connect the Meter as follows:
Set the switch to V
Auto measurement mode is default. In this mode, you can
measure AC voltage and DC voltage.
Connect the test leads to the object being measured. The
measured value is shown on the display.
When voltage measurement has been completed,
disconnect the testing leads from the circuit under test,
and remove the testing leads from the input terminal of
the meter.
1. AC / DC Voltage auto Measurement.
Note:
The threshold voltage of AC voltage is around 400mV.
⚠ Warning
To avoid harm to the Meter, never input higher than 300V
voltage, although it is possible to measure higher voltage.
Set the switch to V
Press SELECT to select DC voltage measurement mode.
Connect the test leads to the object being measured. The
measured value is shown on the display.
When voltage measurement has been completed,
disconnect the testing leads from the circuit under test,
and remove the testing leads from the input terminal of
the meter.
2. DC Voltage Measurement
⚠ Warning
To avoid harm to the Meter, never input higher than 300V
voltage, although it is possible to measure higher voltage.
Set the switch to V
Press SELECT to select AC voltage measurement mode.
Connect the lest leads to the object being measured. The
measured value is shown on the display.
When voltage measurement has been completed,
disconnect the testing leads from the circuit under test,
and remove the testing leads from the input terminal of
the meter.
3. AC Voltage Measurement
Note:
The threshold voltage of AC voltage is around 400mV.

JT2007
Pen Type Multimeter
Operating Manual
Turn the Meter off. Disconnect the testing leads from
the circuit under test, and remove the testing leads
from the input terminals of the Meter.
Remove the screw from the battery compartment
and separate the battery compartment from the
case bottom.
Remove the battery from the battery compartment.
Replace the battery with a new 3V battery.
Insert again the case bottom and the battery
compartment, and tighten the screw.
1.
2.
3.
4.
5.
⚠ Warning
To avoid harm to the Meter, never input higher than 300V
voltage, although it is possible to measure higher voltage.
⚠ Warning
To avoid damages to the Meter or to the devices under lest,
disconnect circuit power and discharge all the high-voltage
capacitors before the measurement.
⚠ Warning
Do not attempt to repair or service your Meter unless you
are qualied to do so and have the relevant calibration,
performance test, and service information.
To avoid electrical shock or damage to the Meter, do not get
water inside the case.
⚠ 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.
To replace the battery:
⚠ Warning
To avoid damages lo the Meler or to the devices under lest,
disconnect circuit power and discharge all the high-voltage
capacitors before measuring the resistance.
⚠ Warning
To avoid damages to the Meter or to the devices under test,
disconnect circuit power and discharge all the high-voltage
capacitors before the continuity test.
To measure resistance, do the following:
⚠ Warning
To avoid damages to the Meter or to the devices under test,
disconnect the circuit power and discharge all the high-
voltage capacitors before measuring diodes.
To measure diode, do the following:
⚠ Warning
To avoid damage to the Meter or to the equipment under
test, disconnect circuit power and discharge all high-voltage
capacitors before measuring capacitance. Use the DC
Voltage function to conrm that the capacitor is discharged.
To measure capacitance, connect the Meter as follows:
Set the switch to V EF and remove the test lead from
the input terminal.
Press SELECT to select EF measurement mode.
Place the positive terminals towards the object being
measured.
Maximum voltage between red Terminals and Grounding:
300Vrms.
Maximum Display: 3,000. Updates 4 times/second
Temperature:
Operating: 3ºC~40ºC (32ºF~104ºF);
Storage: -10ºC~50ºC (14ºF~122ºF).
Relative Humidity:≤75% @ 0ºC~30ºC;
≤50% @ 31ºC~40ºC.
Altitude: Operating: 2,000m; Storage: 10,000m.
Battery Type: 3V Li-MnO2 Button cell battery.
Low Battery: Display “ ”.
Dimensions (HxWxL): 20.18x26.5x181.5mm.
Weight: Approx. 90g (battery included).
Accuracy: ±(a% reading+b digits) guaranteed for 1 year.
Operating temperature: 18ºC~28ºC.
Relative humidity: <75%.
This section provides basic maintenance information and
battery replacement instruction.
Remark:
1. In auto scan mode, the max. range is 300μF.
2. There is a residual reading when the circuit is open. To
measure a small value of capacitance, subtract it to ensure
accuracy.
Set the switch to Ω
Auto measurement mode is default, in this mode, you can
measure Resistance, Diode, Continuity and Capacitance
automatically.
For better accuracy, it is better to separate the object being
measured from the circuit before the measurement.
When voltage measurement has been completed,
disconnect the testing leads from the circuit under lest.
Set the switch to Ω
Press SELECT to select Ωmeasurement mode.
Connect the test leads to the object being measured.
When resistance measurement has been completed,
disconnect the testing leads from the circuit under test, and
remove the testing leads from the input terminals of the
Meter.
Periodically wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
Clean the terminals with a cotton bar with detergent, as
dirt or moisture in the terminals can affect the readings.
Turn the Meter off when it is not in use and take out the
battery when do not use it for a long time.
Do not store the Meter in a humid, hot, explosive,
inammable place or with a strong magnetic eld.
Set the rotary switch to Ω
Press SELECT to select measurement mode.
Connect the test leads to the object being measured.
The buzzer will sound continuously if the resistance of
a circuit under test is ≤30Ω; it indicates the circuit has a
good connection.
Set the rotary switch to Ω
Press SELECT to select measurement mode.
For better accuracy, it is better to separate the object being
measured from the circuit before the measurement.
When diodes measurement has been completed,
disconnect the testing leads from the circuit under test.
Set the rotary switch to Ω
Press SELECT to select measurement mode.
For better accuracy, it is better to separate the object being
measured from the circuit before the measurement.
When diodes measurement has been completed,
disconnect the testing leads from the circuit under test.
4. EF Measurement G. Capacitance
5. Ω auto measurement
6. Resistance Measurement
A. General Service
B. Replacing the Battery
7. Continuity Test
8. Diodes Test
9. Capacitance Measurement
Note:
In auto measurement mode, when input:
Resistance: <15Ω or >10MΩ
Capacitance: <400pF or >1mF
You will get an irresponsible value.
Note:
When continuity measurement has been completed,
disconnect the testing leads from the circuit under test, and
remove the testing leads from the input terminals of the
Meler.
General Specications
Accuracy Specications
Maintenance (see gure 4)
Remark: Input Impedance: ≥10MΩ
Frequency Response: 40Hz~400hZ
A. AC Voltage
Range Resolution Accuracy Overload Protection
3V 0.001V
30V 0.01V
300V 0.1V
± (1%+4) 300Vrms
Remark: Input Impedance: ≥10MΩ
B. DC Voltage
Range Resolution Accuracy Overload Protection
3V 0.001V
30V 0.01V
300V 0.1V
± (1%+3) 300Vrms
Remark: In the auto scan mode, the max range is 3MΩ.
D. Resistance
Range Resolution Accuracy Overload Protection
300Ω 0.1Ω
3kΩ 1Ω
30kΩ 10Ω
300kΩ 100Ω
3MΩ 1kΩ
30MΩ 10kΩ
± (1%+3)
± (1.5%+5)
300Vrms
Range Resolution Accuracy Overload Protection
3nF 0.001nF
30nF 0.01nF
300nF 0.1nF
3µF 1nF
30µF 10nF
300µF 100nF ± (5%+5)
3mF Reference
± (3%+5)
300Vrms
C. EF Test
Range Resolution
220V/50H <10mm: buzzer beeps
10~50mm: may and may not beeps
>50mm: buzzer not sound
E. Continuity Measurement
Range Resolution Remark
0.1Ω
Open Circuit Voltage around -1.2V; buzzer
beeps at resislance, ≤10Ω; buzzer not
sound when resistance is > 70Ω
Remark: Open Circuit Voltage around 3V, displays an
approximate forward voltage drop.
F. Diodes Measurement
Range Resolution Overload Protection
1mV 300 Vrms
Figure 4