Cojali Jaltest JT2001 User manual

JT2001
Pocket Size Multimeter
User Manual
Figure 1
Figure 3
Figure 2
I. Overview
The latest generation JT2001 series products redene the performance
standards for entry-level digital multimeter. The innovative industrial
design ensures the products have 2 meters impact resistance. The new
LCD display layout provides a clear display for better user experience. The
JT2001 series ensure safe operation in CAT II 250 V enviroment.
The special feature of JT2001 is the NCV test.
II. Open Box Inspection
Open the package box and take out the device. Please check whether
the following items are decient or damaged and contact your supplier
immediately if they are.
User Manual ---------------------- 1pcs
Test leads ------------------------- 1pair
Protective Case ------------------ 1pcs
⚠ Warning:
Please carefully read “Safe Operation Rule” before using the device.
VIII. Operations
To avoid false reading, replace the battery if the battery low power symbol
appears. Also pay special attention to the warning sign beside
the test lead jack, indicating that the tested voltage or current must not
exceed the values listed on the device.
HOLD/SEL: Press to enter or exit data hold mode.
In continuity/diode mode, press to cycle switch between the two
modes.
: Press to turn on/off backlight.
Before measuring, switch off the power supply of the circuit and carefully
check the input terminal and range position.
If the range of the measured current is unknown, select the maximum
range and then reduce accordingly.
Please replace the fuse with one of the same type.
10A jack: Fuse 10A/250V Φ5x20mm
VΩmA jack: Fuse 0,2A/250V Φ5x20mm
When measuring, please do not connect the test leads with any circuit
in parallel. Otherwise there is a risk of damage to the device and human
body.
If the tested current is over 10A, each measurement time should be less
than 10 seconds and the next test should be after 15 minutes.
1. Safety certication
Do not measure voltage over 250Vrms, or it may expose users to electric
shock and damage the device. If the range of the voltage to be measured
is unknown, select the maximum range and reduce it accordingly.
Please pay extra attention when measuring high voltage in order to
avoid electric shock.
Before using the device, it is suggested to measure a known voltage
for verication.
⚠ Notes:
⚠ Notes:
2. Safety instructions and precautions
1. AC/DC voltage measurement (see Figure 2)
III. Safe Operation Rule
VII. Key functions
This device strictly follows the CE standards: EN 61010-1:2010, EN 61010-2-
030:2010, EN 61326:2013, as well as CAT II: 250V, RoHS, pollution grade II,
and double insulation standards.
Do not use the device if the device or test leads seem damaged or if
you suspect that the device is not operating properly. Pay particular
attention to the insulation layers.
If the test leads are damaged, they must be replaced with one of the
same type or the same electrical specication.
When measuring, do not touch exposed wires, connectors, unused
inputs, or the circuit being measured.
When measuring a voltage higher than 60 VDC or 30 VACrms, keep
your nger behind the nger guard on the test lead in order to
prevent electric shock.
If the range of the voltage to be measured is unknown, the maximum
range should be selected and then gradually decreased.
Never input voltage and current exceeding the value listed on the
device.
Before switching ranges, make sure to disconnect the test leads with
the circuit to be tested. It is strictly prohibited to switch the ranges
during the measurement.
Do not use or store the device in high temperature, high humidity,
ammable, explosive or strong magnetic eld enviroments.
Do not change the internal circuit of the device in order to avoid the
damage to the device and users.
To avoid false reading, replace the battery when the battery indicator
appears.
Use dry cloth to clean the case, do not use detergent containing
solvents.
Switch the dial to “V~” position.
Insert the black test lead into the COM jack, the red test lead into the
“VΩmA” jack. Connect test leads with the charge in parallel.
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2.
Before measuring resistance, switch off the power supply of the circuit,
and fully discharge all capacitors.
If the resistance when probes are shorted is more than 0.5Ω, please
check if test leads are loosened or damaged.
If the resistor is open or over the range, the “OL” symbol will be displayed
on the screen.
When measuring low resistance, the test leads will produce 0.1Ω-0.2Ω
measurement error. To obtain accurate measurement, the measured
value should subtract the value displayed when two test leads are
shorted.
When measuring high resistance above 1 MΩ, it is normal to take a few
seconds to steady the readings. In order to quickly obtain steady data,
use short test wires to measure high resistance.
⚠ Notes:
2. Resistance measurement (see gure 2)
Switch the dial to “Ω” position.
Insert the black test lead into the COM jack, the red test lead into the
“VΩmA” jack. Connect test leads with the resistor in parallel.
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2.
5. DC measurement (see Figure 3)
Switch the dial to DC test.
Insert the black test lead into the COM jack, the red test lead into the
“VΩmA” jack. Connect test leads with the tested circuit in series.
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2.
IV. Electrical symbols
Low battery High voltage warning
Electrical ground Direct current
Warning Alternating current
Double insulation
Conforms to UL STD. 61010-1,61010-2-030, Certied to CSA STD.
C22.2 No. 61010-1,61010-2-030.
Comply with European Union Standards
It is applicable to test and measuring circuits connected directly
to utilization points (socket outlets and similar points) of the
low-voltage MAINS installation.
VI. Structure (see Figure 1)
1Display screen 410A input jack
2Function keys 5 COM jack
3Functional dial 6 Remaining inputs jack
V. Specication
The maximum voltage between the input terminal and the ground:
250 Vrms
10A terminal: Fuse 10A 250V Fast fuse Φ5x20mm
mA/µA terminal: Fuse 10A 250V Fast fuse Φ5x20mm
Max display 1999, over range display “OL”, update rate: 2~3 times/second
Range select: manual range
Backlight: manual on, auto shut off after 30 seconds
Polarity: “-” symbol displayed on screen represents negative polarity
signal.
Data hold function: symbol is displayed on screen when data hold
function is activated.
Low battery power: symbol is displayed on screen when battery
power is low.
Battery: AAA 1.5V x 2
Operating temperature: 0~40ºC (32ºF~104ºF)
Storage temperature: -10~50ºC (14ºF~122ºF)
Relative humidity: 0ºC~30ºC: ≤75% RH, 30ºC~40ºC: ≤50% RH
Operating altitude: 0~2000m
Dimension: 134x77x47mm
Weight: about 206g (battery included)
Electromagnetic compatibility:
In elds with less than 1V/m radio frequency, the total accuracy =
designated accuracy + 5% of measurement range. In elds with more
than 1V/m radio frequency, the accuracy is not specied.
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Before measuring continuity, switch off the power supply of the circuit,
and fully discharge all capacitors.
⚠ Notes:
3. Continuity measurement (see Figure 2)
Switch the dial to “ ” position.
Insert the black test lead into the COM jack, the red test lead into the
“VΩmA” jack. Connect test leads with the points to be tested in parallel.
If measured points resistance >51Ω, circuit is in open status.
If measured points resistance ≤10Ω, circuit is in good conduction
status, buzzer will go off.
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2.
3.
Before measuring PN junction, switch off the power supply to the circuit,
and fully discharge all capacitors.
⚠ Notes:
4. Diode measurement (see Figure 2)
Switch the dial to “ ” position.
Insert the black test lead into the COM jack, the red test lead into the
“VΩmA” jack. Connect test leads with the diode in parallel.
“OL” symbol appears when the diode is open or polarity is reversed.
For silicon PN junction, normal value: 500 ~ 800mV (0.5 - 0.8V).
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3.

JT2001
Pocket Size Multimeter
User Manual
Clean the case with a damp cloth and detergent. Do not use
abradants or solvents.
If there is any malfunction, stop using the device and send it to
maintenance.
The maintenance and service must be conducted by qualied
professionals or designated departments.
Switch the dial to “OFF “position and remove the test leads from the
input terminal.
Take off the protective case. Loosen the screw on battery cover,
remove the cover to replace the battery. Please identify the positive
and negative pole.
Switch the dial to “OFF” position and remove the test leads from the
input terminal.
Loosen the both screws on the rear cover, then remove the rear cover
to replace the fuse.
Fuse specication.
F1 Fuse 0.2A/250V Φ5x20mm ceramic tube
F2 Fuse 10A/250V Φ5x20mm ceramic tube
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To ensure accuracy, operating temperature should be within 18ºC ~ 28ºC
Temperature Coefcient= 0.1*(specied accuracy)/ °C (<18°C or>28°C).
⚠ Notes:
Accuracy: ±(% of reading + numerical value in least signicant digit
slot).
1 Year Warranty.
Ambient temperature: 23ºC ± 5ºC (73.4ºF ± 9ºF)
Ambient humidity: ≤75& RH
IX. Technical specication
X. Maintenance
Input impedance: about 10MΩ.
Results might be unstable at mV range when no charge is connected.
The value becomes stable once the charge is connected. Least
signicant digit ≤±3.
Max input voltage: ±250V, when the voltage ≥610V, “OL” symbol appears.
Overcharge protection: 250Vrms (AC/DC).
1. DV voltage
Range Resolution Accuracy
200mV 0.1mV ±(0.7%+3)
2000mV 1mV ±(0.5%+2)
20.00V 0.01V ±(0.7%+3)
200.0V 0.1V ±(0.7%+3)
250V 1V ±(0.7%+3)
Input impedance: about 10MΩ.
Frequency response: 40Hz ~ 400Hz, sine wave RMS (average response).
Max input voltage: ±250V, when the voltage ≥610V, “OL” symool appears.
Overcharge protection: 250Vrms (AC/DC).
2. CV voltage
Range Model Resolution Accuracy
200.0V JT2001 0.1V ±(1.2%+3)
250V JT2001 1V ±(1.2%+3)
Measurement result = reading of resistor - reading of shorted test leads
Overcharge protection: 250Vrms (AC/DC).
3. Resistance
Range Resolution Accuracy
200.0Ω 0.1Ω ±(1.0%+2)
2000Ω 1Ω ±(0.8%+2)
20.00kΩ 0.01kΩ ±(0.8%+2)
200.0kΩ 0.1kΩ ±(0.8%+2)
20.00MΩ 0.01MΩ ±(1.2%+3)
200.0MΩ 0.1MΩ ±(5.0%+10)
Input current >10A , “OL” symbol appears and buzzer beeps.
Overcharge protection: 250Vrms.
µA mA range: F1 Fuse 0.2A/250V Φ5x20mm
10A range: F2 Fuse 10A/250V Φ5x20mm
6. DC current
Range Resolution Accuracy
2000µA 1µA ±(1.0%+2)
20.00mA 0.01mA ±(1.0%+2)
200.0mA 0.1mA ±(1.0%+2)
10.00A 0.01A ±(1.2%+5)
Measurement result = reading of resistor - reading of shorted test leads
Overcharge protection: 250Vrms (AC/DC).
5. Capacitance
Range Resolution Accuracy
2.000nF 0.001nF Under REL mode ±(5%+5)
20.00nF 0.01nF ±(4%+8)
200.0nF 0.1nF ±(4%+8)
2.000µF 0.001µF ±(4%+8)
20.00µF 0.01µF ±(4%+8)
200.0µF 0.1µF ±(4%+8)
2.000mF 0.001mF ±(10%)
Overcharge protection: 250Vrms (AC/DC).
4. Continuity, diode
Range Resolution Remark
0.1Ω
If the measured resistance is greater
than 50Ω, the measured circuit will be
regarded as in open status, and the
buzzer does not go off.
If the measured resistance is less
than 10Ω, the measured circuit will be
regarded as in good conduction status,
and the buzzer goes off.
0.001V
Open circuit voltage: 2.1V, test current is
about 1 mA Silicon PN junction voltage is
about 0.5~0.8V.
1. General maintenance
2. Replacements (see Figure 5a, Figure 5b)
Battery replacement:
Fuse replacement:
⚠ Warning: Before opening the rear cover, switch off the power supply
(remove test leads from the input terminal and the circuit).
To avoid false reading, replace the battery when the battery indicator
appears.
Battery Specication: AAA 1.5V x 2
Protective
Case Protective
Case
Screw
Screw
Fuse
The device enters measurement status in 2 seconds after the start-up.
The device automatically shuts down if there is no operation for 15
minutes.
You can turn on the device by pressing any key.
To disable auto shutdown, switch the dial to OFF position, long press
HOLD key and turn on the device.
When pressing any key or switching the dial, the buzzer will beep once.
Buzzer Notication.
7. Additional features
6. NCV measurement (see Figure 4)
Switch the dial to NCV position.
Place the device near the measured object. “ - ” symbol indicates the
intensity of the electric eld. More “ - “ and the higher the buzzer
frequency, the higher the electric eld intensity.
Intensity of electric eld.
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Figure 4
Figure 5a Figure 5b
Input voltage ≥250V (AC/DC), buzzer will continuously beep indicating
measure range is at limit.
Input current >10A (AC/DC), buzzer will continuously beep indicating
measure range is at limit.
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2.
1 min before auto shutdown, 5 continuous beeps.
Before shutdown, 1 long beep.
Low power warnings:
Voltage of the battery < 2.5V, symbol appears and ashes for 3 seconds
every 6 second period. During low power status, the device can still work.
Voltage of the battery < 2.2V, a solid symbol appears, the device cannot
work.