YATO YT-73087, Руководство по эксплуатации, Страница: 12 / 64

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O P E R A T I N G M A N U A L
GB
proximately 2 seconds. Push the button again to deactivate the function. Illumination is turned off automatically after approximately
15 seconds.
Connection of the test leads
Remove the protection caps from the plugs and connect them in accordance with the instructions. Then remove the protections of the
measurement part and proceed to measurements.
Internal buzzer
The meter is equipped with an internal buzzer, which emits a short sound every time a button is pressed to confirm it. The buzzer
will emit a sound in the following situations: in case of a measurement of Alternating voltage, if its value exceeds 750 V; in case of a
measurement of direct voltage, if its value exceeds 1000 V; in case of the range „ μ A”, if the value of the measured current exceeds
4000 μ A; in of the case range „mA”, if the value of the measured current exceeds 400 mA; in case of the range „10A”, if the value of
the measured current exceeds 10 A. The buzzer will emit five sound signals per minute before the meter turns off automatically and
one long sound signal immediately before the meter turns off automatically.
MEASUREMENTS
Depending on the actual position of the range switch, four significant digits will be displayed. If it is necessary to replace the battery,
the multimeter indicates this displaying the battery symbol. If before the measured value the “-” symbol is displayed then the measured
value has an opposite polarization in relation to the connection of the meter. In case the symbol „OL” is displayed, the measurement
range has been exceeded, and it is necessary to increase the measurement range. In case of measurements of quantities of unknown
values the meter should be switched to „AUTO”, where it will automatically determine the adequate measurement range.
ATTENTION! The measurement range of the meter must not be lower than the measured value. It might damage the meter
and cause an electric shock.
The correct connection of the leads:
The red lead must be connected to the socket marked as „V Ω Hz”, „mA O C” or „10A”.
The black lead must be connected to the socket marked as „COM”
In order to ensure the highest possible precision of the measurements the optimum measurement conditions must be observed: ambi-
ent temperature between 18°C and 28°C and relative humidity <75 %
Determination of precision
Precision: ± % of the indi weight of the least significant digit
Measurement of the direct voltage: 1,396 V
Precision: ± (0,8% + 5)
Calculation of the error: 1,396 x 0,8% + 5 x 0,001 = 0, 0,005 = 0,016168
Result of the measurement: 1,396 V ± 0,016 V
Measurements of the voltage
Connect the measurement cables to the sockets marked as „ V Ω Hz” and „COM”. Switch the range selector to the position of the
measurement of the direct voltage or alternating voltage. Connect the measurement cables in parallel to the electric circuit and read
the result of the Measurements of the voltage. Do not ever measure a voltage exceeding 300 V. It might damage the meter and cause
an electric shock.
Measurement intensity of the current
Depending on the expected value of the measured intensity of the current connect the measurement cables to the socket marked as
„ mA
O
C” and „COM” or to the socket marked as „10A” and „COM”. Use the knob to select the correct measurement range, and the
button „SELECT.” To select the kind of the measured current. The maximum intensity of the current measured through the „mA” socket
may amount to 400 mA. In case of measurements of the current exceeding 400 mA, connect the lead to the socket marked as „10A”.
The maximum intensity of the current measured through the socket marked as „10A” may amount to 10 A and it is not protected with
a fuse. Therefore the duration of the measurements of currents exceeding 2 A must not exceed 15 seconds, and then it is required
to wait at least 15 minutes before the next measurement. The maximum power-carrying capacity of the „mA” socket amounts to 400
mA. 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 first 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 „ V Ω Hz” and „COM” and switch the range selector to the measurements of
resistance. Place the measurements leads at the terminals of the measured element and read the result of the measurement. In order