Cojali Parts JT2001 Pocket Size Multimeter User Manual

**Cojali Parts JT2001 Pocket Size Multimeter User Manual

**

Overview

The latest generation JT2001 series products redefine 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 environment. The special feature of JT2001 is the NCV test.

Open Box Inspection

Open the package box and take out the device. Please check whether the following items are deficient 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.

Safe Operation Rule

Safety certification

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.

Safety instructions and precautions

• 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 specification.
• 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 finger behind the finger 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 of 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, flammable, explosive or strong magnetic field environments.
• 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.

Electrical symbols

| Low battery| | High voltage warning
---|---|---|---
| Electrical ground| | Direct current
| Warning| | Alternating current
| Double insulation
| Conformity with UL STD. 61010-1,61010-2-030, Certified to CSA STD. C22.2 No. 61010-1,61010-2-030.
| Compliance with European Union Standards
CAT II| Applicable to test and measuring circuits connected directly to utilization points (socket outlets and similar points) of the low- voltage MAINS installation.

Specification

1. The maximum voltage between the input terminal and the ground: 250 Vrms
2. 10A terminal: Fuse 10A 250V Fast fuse Φ5x20mm
3. mA/µA terminal: Fuse 10A 250V Fast fuse Φ5x20mm
4. Max display 1999, over range display “OL”, update rate: 2~3 times/second
5. Range select: manual range
6. Backlight: manual on, auto shut off after 30 seconds
7. Polarity: “-” symbol displayed on screen represents negative polarity signal.
8. Data hold function: symbol is displayed on screen when data hold function is activated.
9. Low battery power: symbol is displayed on screen when battery power is low.
10. Battery: AAA 1.5V x 2
11. Operating temperature: 0~40ºC (32ºF~104ºF)
12. Storage temperature: -10~50ºC (14ºF~122ºF)
13. Relative humidity: 0ºC~30ºC: ≤75% RH, 30ºC~40ºC: ≤50% RH
14. Operating altitude: 0~2000m
15. Dimension: 134x77x47mm
16. Weight: about 206g (battery included)
17. Electromagnetic compatibility:
18. In fields with less than 1V/m radio frequency, the total accuracy = designated accuracy + 5% of measurement range. In fields with more than 1V/m radio frequency, the accuracy is not specified.

Structure (see Figure 1)

Key functions

• 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.

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.

**AC/DC voltage measurement (see Figure 2)

Notes**

• 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 verification.

Resistance measurement (see figure 2)

1. Switch the dial to “Ω” position.
2. 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.

Notes

• 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.

Continuity measurement (see Figure 2)

1. 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.

2. If measured points resistance >51Ω, circuit is in open status.

3. If measured points resistance ≤10Ω, circuit is in good conduction status, buzzer will go off.

Notes

• Before measuring continuity, switch off the power supply of the circuit, and fully discharge all capacitors.

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).

Notes

• Before measuring PN junction, switch off the power supply to the circuit, and fully discharge all capacitors.

DC measurement (see Figure 3)

1. Switch the dial to DC test.
2. 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.

Notes

• 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 0.2A/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.

NCV measurement (see 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.

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.

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
   ---|---|---
   | 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.

   • 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

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.

8. 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).

9. Maintenance

10. Warning: Before opening the rear cover, switch off the power supply
    (remove test leads from the input terminal and the circuit)

11. General maintenance

12. Clean the case with a damp cloth and detergent. Do not use abradants or solvents.

13. If there is any malfunction, stop using the device and send it to maintenance.

14. The maintenance and service must be conducted by qualified professionals or designated departments.

15. Replacements (see Figure 5a, Figure 5b)
    Battery replacement:
    To avoid false reading, replace the battery when the battery indicator 0appears.
    Battery Specification: AAA 1.5V x 2

16. Switch the dial to “OFF “position and remove the test leads from the input terminal.

17. 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.

18. Fuse replacement:

19. Switch the dial to “OFF” position and remove the test leads from the input terminal.

20. 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
                                                        Figure 5a Figure 5b

COJALI S.L.
Avenida de la Industria N313610 Campo de Criptana.
Spain Tel: +34 926 589 670
www.cojali.com
www.jaltest.com EN23 V1

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