ENGLISH
27
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 and is the effective value of the sine wave (average value).
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 approx. 0.5 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 (0.2% or less).
Disconnect the test leads from the circuit under test when the measurement has been completed.
MEASURING DC CURRENT
WARNING!
Never attempt to take a current measurement in a circuit where the open circuit potential
between the circuit and earth is greater than 300V. If the fuse trips during measurement, you may be
injured and/or the multimeter damaged. Connect to the correct contacts and set the correct function and
measurement range for the measurement. When the test leads are connected to the measurement
points, be careful not to connect them in parallel across a circuit.
There are three positions for measuring DC current: 2000
μ
A, 20mA and 200mA. Measure direct current
as follows:
1.
Disconnect the current from the circuit being tested. Discharge all high-voltage capacitors.
2.
Set the mode selector to a suitable measurement position in the
range.
3.
Break the current path to be tested. Connect the red test lead to the more positive side of the break
point and the black test lead to the more negative side.
4.
Turn on power to the circuit. The reading obtained is shown on the display.
Notes
If you have no idea what the current is, start at the highest measurement range (200 mA) and then
switch progressively to lower ranges until a satisfactory reading is obtained.
Disconnect the test leads from the circuit under test when the measurement has been completed.
Square wave (output)
WARNING!
To avoid damage to the multimeter, do not allow the output terminals to reach more than
10V.
Measure square wave output as follows:
1.
Set the mode selector to
.
2.
Connect the test leads across the object being measured. The reading obtained is shown on the
display.
Notes
The frequency is approx. 50 Hz.
The output voltage range will be over 3Vpp when it is loaded at 1M
Ω
.
Disconnect the test leads from the object when the measurement has been completed.
Battery test
Test batteries as follows:
1.
Set the mode selector to “1.5V” or “9V” in the
range.
2.
Connect the test leads across the battery being measured (the red test lead to the plus terminal of
the battery). The reading obtained is shown on the display and is the voltage between the battery’s
cathode and anode.
Note
Disconnect the test leads from the battery when the measurement has been completed.
Testing diodes
WARNING!
To avoid damage to the multimeter or diode, disconnect the power and discharge all high-
voltage capacitators before testing diodes.
Use the diode test to test diodes, transistors and other semiconductor devices. This function sends a
current through the semiconductor junction and then measures the voltage drop. In a good silicon
junction, the voltage drops between 0.5 and 0.8 volts.
