Toya VOREL 81774 Manual Del Usuario página 12

This can damage the meter and cause electric
shock.
The correct connection of the leads is:
The red lead goes in the jack marked "VΩmA" or
"10ADC".
The black lead goes in the jack marked "COM".
In order to achieve the highest possible measure-
ment accuracy, optimal measurement conditions
should be ensured. The ambient working temper-
ature should be in the range from 18 to 28
relative air humidity <75%.
Example of accuracy determination
Accuracy: ± (% of indication + weight of the least
signifi cant digit)
Measurement of DC voltage: 1.396 V
Accuracy: ±(0.8% +5)
Calculation of error: 1.396 x 0.8% + 5 x 0.001 =
0.011168 + 0.005 = 0.016168
Measurement result: 1.396 V ± 0.016 V
Voltage measurement
Connect the test leads to the jacks marked "VΩmA"
and "COM". Set the range switch to the DC or AC
voltage measurement position. Connect the test
leads in parallel to an electrical circuit and read the
resultant voltage. Never measure a voltage which is
higher than the maximum measuring range. This can
damage the meter and cause electric shock.
Current measurement
Depending on the expected value of the meas-
ured current, connect the test leads to the VΩmA
and COM jacks or to the 10A DC and COM jack.
Select the appropriate measuring range using the
knob. The maximum current measured in the VΩmA
jack can be 200 mA. If the current measurement is
higher than 200 mA, connect the lead to the 10 ADC
jack. The maximum current measured in the 10ADC
socket can be 10 A and is not protected by any fuse.
Therefore, the measurement time of currents higher
than 2 A must not exceed 15 seconds, after which a
break of at least 15 minutes must be taken before
the next measurement. The VΩmA jack can be load-
ed with a maximum current of 200 mA. It is forbid-
den to exceed the maximum values of currents
12
O R I G I N A L
GB
and voltages for a given jack. Test leads must be
connected in series to the tested electrical circuit,
select the range and type of measured current by
means of a switch and read the measurement result.
Start by selecting the maximum measuring range.
The measuring range can be changed in order to
obtain more accurate measurement results.
Resistance measurement
Connect the test leads to the jacks marked "VΩmA"
C and and "COM", set the range switch to the resistance
o
measurement position. Touch the probes to the ter-
minals of the measured element and read the meas-
urement result. In order to obtain more accurate
measurement results, change the measuring range
if necessary. It is absolutely forbidden to measure
the resistance of elements through which elec-
tric current is fl owing. For measurements greater
than 1 MΩ, the measurement may take a few sec-
onds before the readout becomes stable, which is
the normal response for high resistance measure-
ments.
Before touching the probes to the workpiece, an
overload symbol is shown on the display.
Diode test
Connect the test leads to the jacks marked "VΩmA"
and "COM" and set the selector to the diode symbol.
The probes are now touched to the diode terminals:
once in the forward and then in the reverse direction.
If the diode is working, it will show a voltage drop in
its forward direction expressed in mV. If connected in
the reverse direction, the display will show the over-
load symbol. Working diodes are characterized by
a low resistance in the forward direction and a high
resistance in the reverse direction. It is absolutely
forbidden to test diodes through which electric
current is fl owing.
Conduction test
Connect the test leads to the jacks marked "VΩmA"
and "COM". Set the selector to the buzzer symbol.
If the meter is used to measure conduction, the
built-in buzzer will sound whenever the measured
resistance drops below 30 Ω. The buzzer can also
be heard in the range from 30 Ω to 100 Ω. It is ab-
solutely forbidden to test conductivity in circuits
I N S T R U C T I O N S