2) 2mA/24V:
Tests a single LED lamp bead without automatic identification of LED
polarity.
3) :
Tests circuit continuity.
3. General Specifications
1) Application Standard
CAT II 300V
2) Working Environment
Operating temperature: 32°F~104°F (0°C~40°C)
Relative humidity:
≤
80%RH
Altitude:
≤
2000 meters
3) Storage Conditions
Storage temperature: 14°F~122°F (-10°C~50°C)
Relative humidity:
≤
75% RH
4) Product Size
56mm*150mm*42mm
5) Product Weight
About 170g
6) Accessories
Power cord ------------- 1 pc
Test leads --------------- 1 pair
User manual ------------1 pc
V. Testing the TV Backlight, LED Lamp and
Other Series Circuit of Multiple LED Lamp
Beads (UT659A & UT659D)
1. Automatic Identification of Polarity
1) Place the toggle switch in the 30mA/300V position and plug in the
power cord. The tester defaults to automatic identification of polarity
and the “AUTO” symbol on the LCD lights up. Wait for 1 minute to
ensure stable voltage output.
2) Connect the output test leads with both ends of the circuit under test
respectively.
3) The tester automatically identifies the polarity of the circuit and adjusts
the positive and negative poles of the output voltage. The multiple LED
lamp beads are lit gradually. If a LED lamp bead is not lit, it is damaged.
4) When the positive and negative ends of the test leads are connected
with both ends of the circuit under test in reverse and the backward
impedance of the circuit is as large as approximately open circuit, the
test output has no response. In this case, manually change the polarity
of the test leads for testing.
5) If the test output still has no response after step 4), the circuit under
test is broken.
2. Non-Automatic Identification of Polarity
1) In the automatic identification of polarity mode, short-circuit the positive
and negative ends of the test leads continuously for about 5s, and the
“AUTO” symbol on the LCD screen will go out, indicating switching to
the non-automatic identification of polarity.
2) Connect the positive end of the test leads with the positive pole of the
circuit under test, and negative end with the negative pole.
3) The multiple LED lamp beads are lit gradually. If a LED lamp bead is
not lit, it is damaged.
Caution:
VI. Single LED Lamp Bead Test (UT659D)
1. Place the toggle switch in the 2mA/24V position.
2. Connect the output test leads with both ends of the LED lamp bead
under test respectively.
3. If the polarity connection is correct and the LED lamp bead is lit, the
LED is normal.
4. If the LED lamp bead is not lit, change the polarity of the test leads for
testing. If the LED lamp bead is still not lit, the LED is damaged; if the
LED lamp bead is lit, the LED is normal (the previous polarity connection
is incorrect).
VII. Continuity Test (UT659A)
1. Place the toggle switch in the position.
2. Connect the output test leads with both ends of the circuit under test
respectively.
3. When the circuit resistance is
≤
100Ω, the LCD displays the resistance
value, and when the resistance value is
≤
30Ω, the buzzer beeps; when
the circuit resistance is >100Ω, the LCD displays OL.
VIII. Maintenance and Repair
1. Cleaning the Casing
Clean the casing of the tester gently with a dry cloth. Do not use alcohol
or solvent as it is corrosive to the casing, especially the LCD. Please
prevent the tester from being wet.
2. Repair
Please contact your seller directly if the following issues occur.
1) The casing of the tester is broken or the tester is damaged.
2) The LCD displays abnormally.
3) Unexpected test data occur under normal use.
4) The toggle switch does not function normally.
In the automatic identification of polarity mode, when the tested circuit is
connected in parallel with a component or circuit with a lower forward
voltage drop, the polarity judgment will be misled. At this time, switch to
the non-automatic identification of polarity mode for testing.
