YATO YT-73080 Bedienungsanleitung Seite 14

GB
measured through the socket marked as „5A" may amount to 5 A, while the duration of measurement must not exceed 10
seconds, and it is required to wait at least 15 minutes before the next measurement. The maximum current and voltage
values of the sockets must not be exceeded. Connect the measurement cables in series to the tested electric circuit,
select the range and kind of the current and read the result of the measurement. The fi rst stage of the measurements
is to select the maximum measurement range. In order to ensure more precise results of the measurement you may
change the measurement range.
Measurements of resistance
Connect the measurement cables to the sockets marked as „VΩmA" and „COM"; switch the measurement range selector
in the position of the measurement of resistance. Place the measurements leads at the terminals of the measured
element and read the result. In order to ensure more precise results of the measurement the measurement range may
be changed if required. It is strictly prohibited to measure the resistance of live elements. In case of measurements
of values exceeding 1MΩ the measurement may take a couple of seconds before the result is stable, which is a normal
reaction during measurements of high resistances.
Diode test
Connect the measurement cables to the sockets marked as „VΩmA" and „COM"; switch the measurement range selector
to the diode symbol. Place the measurement leads to the diode terminals in the conduction direction and the reverse
direction. If the diode is functioning correctly, then at the diode connected in the forward direction we will read the voltage
drop for this diode expressed in mV. In case the diode is connected in the reverse direction the display will read „1.".
Correctly functioning diodes show a low resistance in the forward direction and a high resistance in the reverse direction.
It is strictly prohibited to test live diodes.
Conduction test
Connect the measurement cables to the sockets marked as „VΩmA" and „COM" and switch the measurement range
selector to the buzzer symbol.
In case the meter is used for conduction measurements, the internal buzzer will emit sound each time the measured
resistance drops below 30Ω ±20Ω. It is strictly prohibited to test the conduction of live circuits.
Transistor test
Switch the measurement range selector to the position marked with the h symbol (measurement of the gain coeffi cient
FE
of the transistor). Depending on the type of transistor it must be connected to the socket of the base marked as PNP or
NPN, making sure the terminals of the transistor are placed in accordance with the letter indications: E - emitter, B - base,
C - collector. If the transistor is functioning properly and the connection is correct, the result of the measurement of the
gain coeffi cient is read in the display. It is strictly prohibited to test live transistors.
Signal generator
Switch the measurement range selector in the position marked as „*". Between the sockets marked as „VΩmA" and
„COM" a signal is generated whose frequency is 50 Hz and the peak to peak voltage is 5 Vp-p. The impedance of the
output is 50kΩ. It is prohibited to connect the generator signal to any sources of voltage or current.
MAINTENANCE AND STORAGE
Clean the meter with a soft cloth. Remove heavy soiling with a damp cloth. Do not submerge the meter in water or any
other liquid. Do not use solvents, caustic or abrasive substances to clean the meter. Make sure the contacts of the meter
and the measurement cables are clean. Clean the terminals of the measurement cables with a cloth slightly soaked with
isopropyl alcohol. In order to clean the contacts of the meter, turn the meter off and remove the battery. Turn the meter
round and shake it slightly to remove major impurities from the contacts of the meter. Soak slightly a cotton swab in
isopropyl alcohol and clean each contact. Wait until the alcohol has evaporated and replace the battery. Store the meter
in a dry place in the provided case.
YT-2861
Properties of the instrument
The electric indicator permits to measure the alternating voltage and to detect the alternating voltage by means of the
inductive method. Both measurements may be realised within the range from 12 V to 250 V.
The electric indicator is not a measuring instrument, as it is construed in the „Measures Act"
O P E R A T I N G M A N U A L
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