ENGLISH
28
Test a diode out of a circuit as follows:
1.
Set the mode selector to
.
2.
To measure a forward voltage drop in a semiconductor component, connect the red test lead to the
component’s anode and the black test lead to the cathode. The reading obtained is shown on the
display.
Notes
A good diode that is measured in a circuit should produce a forward voltage drop reading of 0.5 to
0.8 volts. However, the reverse voltage drop reading can vary depending on the resistance of other
pathways between the test lead tips.
Be sure to connect the test leads correctly, as above, to avoid inaccurate readings.
The LCD display shows “
I
” to indicate a wrong connection (open circuit).
The unit of diode is Volt (V), displaying the positive connection voltage-drop value.
Disconnect the test leads from the component when the measurement has been completed.
Measuring resistance
WARNING!
To avoid damage to the multimeter or to the object being tested, disconnect the power and
discharge all high-voltage capacitators before measuring resistance.
The positions for measuring resistance are 200
Ω
, 2000
Ω
, 20k
Ω
, 200k
Ω
and 2000k
Ω
. To measure
resistance, connect the multimeter as follows:
1.
Set the mode selector to a suitable measurement position in the
Ω
range.
2.
Connect the test leads across the object being measured. The reading obtained is shown on the
display.
Notes
If you have no idea what the resistance is, start at the highest measurement range (2000k
Ω
) and
then switch progressively to lower ranges until a satisfactory reading is obtained.
The test leads can add 0.1
Ω
to 0.2
Ω
of error to resistance measurement. To obtain precision
readings in low-resistance measurement, i.e. in the range of 200
Ω
, short-circuit the input terminals
on the instrument beforehand and record the reading obtained. This value (X in the equation
below) is the additional resistance from the test leads. Then measure the resistance across the
object and use the following equation:
Measured resistance value across the object measured minus X = precision reading
If measuring resistance of >1 M
Ω
, it normally takes a few seconds for the reading to stabilise.
If the reading with shorted test leads is not
≤
0.5
Ω
, check for loose test leads or incorrect function
setting.
The LCD displays “
I
” to indicate open circuit for the tested resistance or the resistance value is
higher than the maximum range of the instrument.
Disconnect the test leads from the resistance when the measurement has been completed.
MEASURING DC VOLTAGE
WARNING!
To avoid electric shock, injury or damage to the instrument, do not try to measure a voltage
above 300V/300V rms, even if a reading can be obtained.
The positions for measuring DC voltage are 200mV, 2000mV, 20V, 200V and 300V. To measure DC
voltage, connect the multimeter as follows:
1.
Set the mode selector to a suitable measurement position in the
range.
2.
Connect the test leads across the object being measured. The reading obtained is shown on the
display.
Notes
If you have no idea what the voltage is, start at the highest measurement range (300V) and then
switch progressively to lower ranges until a satisfactory reading is obtained.
The multimeter has an input impedance of
≥
1 M
Ω
in each range. This loading can cause
measurement errors in high-impedance circuits. If the circuit impedance is equal to or less than
1k
Ω
, the error is negligible (0.1% or less).
Disconnect the test leads from the object being measured when the measurement has been
completed.
