Cojali JT2001 Benutzerhandbuch

JT2001
Pocket Size Multimeter
User Manual
I. 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 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 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.
III. Safe Operation Rule
1. 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.
2. Safety instructions and precautions
1. 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.
2. If the test leads are damaged, they must be replaced with one of the
same type or the same electrical specification.
3. When measuring, do not touch exposed wires, connectors, unused
inputs, or the circuit being measured.
4. 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.
5. If the range of the voltage to be measured is unknown, the maximum
range should be selected and then gradually decreased.
6. Never input voltage and current exceeding the value listed on the
device.
7. 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.
8. Do not use or store the device in high temperature, high humidity,
flammable, explosive or strong magnetic field enviroments.
9. Do not change the internal circuit of the device in order to avoid the
damage to the device and users.
10. To avoid false reading, replace the battery when the battery indicator
appears.
11. Use dry cloth to clean the case, do not use detergent containing
solvents.
IV. 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
Applicable to test and measuring circuits connected directly to
utilization points (socket outlets and similar points) of the low-
voltage MAINS installation.
V. Specification
1. The maximum voltage between the input terminal and the ground:
250 Vrms
10A terminal: Fuse 10A 250V Fast fuse Φ5x20mm
2.
mA/µA terminal: Fuse 10A 250V Fast fuse Φ5x20mm
3.
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)
Storage temperature: -10~50ºC (14ºF~122ºF)
Relative humidity: 0ºC~30ºC: ≤75% RH, 30ºC~40ºC: ≤50% RH
Operating altitude: 0~2000m
12. Dimension: 134x77x47mm
13. Weight: about 206g (battery included)
14 Electromagnetic compatibility:
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.
VI. Structure (see Figure 1)
1 Display screen 4 10A input jack
2 Function keys 5 COM jack
3 Functional dial 6 Remaining inputs jack
Figure 1
VII. 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.
VIII. Operations
To avoid false reading, replace the battery if the battery low power symbol
appears. Also pay special attention to the warning sign
the test lead jack, indicating that the tested voltage or current must not
exceed the values listed on the device.
1. AC/DC voltage measurement (see Figure 2)
1. Switch the dial to "V~" position.
2. 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.
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.
2. 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.
3. Continuity measurement (see Figure 2)
1. Switch the dial to " " position.
2. 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.
3. 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.
⚠ Notes:
Before measuring continuity, switch off the power supply of the circuit,
and fully discharge all capacitors.
4. Diode measurement (see Figure 2)
1. Switch the dial to " " position.
2. 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.
3. "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.
5. 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.
beside
⚠ 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.
Figure 3