In case the checker is used for along time, it will be economical
to utilize AC adapter than battery operation which require
battery replacement.
5.1.5 Other prec autions
(1) Aused-up battery may g^ve bad influence to the LTC-906
by its leaked battery liquid, therefore, such abattery
should be immediately removed from the checker. By the
same reason, abattery should be kept removed when the
checker is not used for along time.
(2) It is dangerous to cause abattery to short or to throw it
into fire.
(3) When the LTC-906 is carried, its power switch should be
kept off regardless the presence or absence of abattery.
With the power switch set at off position, the moving coil
of the meter is made short, and by its brake action, adverse
influence of mechanical shock while in transit to the meter
will be reduced.
(4) The LTC-906 should be carefully handled not to give strong
mechanical shock.
(5) Please do not place the checker near afire or leave it inside
acar under the blazing sun. Plastic portion may be
deformed by heat.
(6) Do not use solvent such as alcohol, theinner, benzine, etc.
for cleaning the checker. These solvents may dissolve the
paint or plastics of the checker.
The checker should be cleaned with aslighdy wet cloth.
5.2 Auto-test
The LTC-906 is capable of making in-circuit and out-of-circuit
test of bipolar transistor, field-effect transistor (FET), SCR, UJT,
diode, etc.
For AUTO-test, there are 2modes of transistor and diode which
can be selected by the TRANSISTOR/DIODE selector.
The AUTO-test unit automatically scans test signal being
impressed to the electrode of asemiconductor to be measured
and determines whether it is good or bad, and identifies the
electrode, if it is good, and causes LEDs to display its results.
Together with LED display, the result of test is notified by the
sound of abuzzer (small speaker) when asemiconductor^ good
in quality. Consequendy, the operator can concentrate his
attention to perform testing without looking at the display panel
for confirming the result of each test, and it is possible to
perform efficient in-circuit test.
When this buzzer sound is not required, this founction is turned
off by the buzzer switch.
For making in-circuit test, connect the plug of the attached test
lead to the test socket iwith its lead wires adjusted to
corresponding colors displayed on the panel, and then connect its
clip to atransistor of diode to be measured.
When an in<ircuit probe Model LP-11, an option, is used being
connected to the end of the test lead, semiconductors installed on
the printed circuit board can be easily measured as the probe’s tip
can be freely moved depend on the arrangement of legs of such
semiconductors.
The attached test lead should be used when atransistor or diode
cannot be directly inserted into the test socket for out-of-circuit
test.
Caution for in-circuit test
(1) Prior to connecting the test clip or probe to an circuit
under test, be sure to turn the power switch of the circuit
off and cause electric charge accumulated in the capacitores
to completely discharge through aresistor of several tens
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