Cojali JT2001 Benutzerhandbuch Seite 2

JT2001
Pocket Size Multimeter
User Manual
6. NCV measurement (see Figure 4)
Figure 4
1. Switch the dial to NCV position.
2. Place the device near the measured object. " - " symbol indicates the
intensity of the electric field. More " - " and the higher the buzzer
frequency, the higher the electric field intensity.
3. Intensity of electric field.
7. Additional features
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 Notification.
1. Input voltage ≥250V (AC/DC), buzzer will continuously beep indicating
measure range is at limit.
2. Input current >10A (AC/DC), buzzer will continuously beep indicating
measure range is at limit.
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 flashes 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.
IX. Technical specification
Accuracy: ±(% of reading + numerical value in least significant digit
slot).
1 Year Warranty.
Ambient temperature: 23ºC ± 5ºC (73.4ºF ± 9ºF)
Ambient humidity: ≤75& RH
⚠ Notes:
To ensure accuracy, operating temperature should be within 18ºC ~ 28ºC
Temperature Coefficient= 0.1*(specified accuracy)/ °C (<18°C or>28°C).
1. AV 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.
Results might be unstable at mV range when no charge is connected.
The value becomes stable once the charge is connected. Least
significant digit ≤±3.
Max input voltage: ±250V, when the voltage ≥610V, "OL" symbol appears.
Overcharge protection: 250Vrms (AC/DC).
2. CV voltage
Range Resolution Accuracy
200.0V 0.1V ±(1.2%+3)
250V 1V ±(1.2%+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).
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)
Measurement result = reading of resistor - reading of shorted test leads.
Overcharge protection: 250Vrms (AC/DC).
4. Continuity, diode
Range Resolution Remark
If the measured resistance is greater
than 50Ω, the measured circuit will be
regarded as in open status, and the
0.1Ω 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.
Open circuit voltage: 2.1V, test current is
0.001V about 1 mA Silicon PN junction voltage is
about 0.5~0.8V.
Overcharge protection: 250Vrms (AC/DC).
5. 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)
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
X. Maintenance
⚠ Warning: Before opening the rear cover, switch off the power supply
(remove test leads from the input terminal and the circuit).
1. General maintenance
1. Clean the case with a damp cloth and detergent. Do not use
abradants or solvents.
2. If there is any malfunction, stop using the device and send it to
maintenance.
3. The maintenance and service must be conducted by qualified
professionals or designated departments.
2. Replacements (see Figure 5a, Figure 5b)
Battery replacement:
To avoid false reading, replace the battery when the battery indicator
appears.
Battery Specification: AAA 1.5V x 2
1. Switch the dial to "OFF "position and remove the test leads from the
input terminal.
2. 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.
Fuse replacement:
1. Switch the dial to "OFF" position and remove the test leads from the
input terminal.
2. Loosen the both screws on the rear cover, then remove the rear cover
to replace the fuse.
Fuse specification.
F1 Fuse 0.2A/250V Φ5x20mm ceramic tube
F2 Fuse 10A/250V Φ5x20mm ceramic tube
Protective
Case
Screw
Figure 5a Figure 5b
EN23 V1
Protective
Case
Screw
Fuse