Velleman DVM990BL - Manual (Page 10)

DVM990BL VELLEMAN 9
4.4. MEASURING VOLTAGE
4.4.1. Connect the black test lead to the COM socket and the red test lead to
the V/
Ω
socket.
4.4.2. Set the rotary switch to the desired V or V range.
4.4.3. Connect the test leads across the source or load under test.
4.4.4. You can see the reading on the LCD. The polarity of the red lead will
be indicated along with the voltage value when making DC voltage
measurements.
NOTE:
1.
When only the figure "1" or "-1" is displayed, it indicates an over range
situation and a higher range has to be selected.
2. When the value to be measured is unknown beforehand, set the range
selector to the highest position.
3. " " means you cannot have a voltage input that is higher than 1000V
DC or 7000V rms AC. It is possible to display a higher voltage, but it
may destroy the interior circuit.
4. Be careful to avoid electric shocks when measuring high voltages.
4.5. MEASURING
CURRENT
4.5.1. Connect the black test lead to the COM socket and the red test lead to
the mA socket for a maximum of 200mA current. For a maximum of
10A, move the red lead to the 10A socket.
4.5.2. Set the rotary switch to the desired A or A range.
4.5.3. Connect the test leads in series with the load under test.
4.5.4. You can see the reading on the LCD. The polarity of the red lead will
be indicated along with the current value when making DC current
measurements.
NOTE:
1.
When only the figure "1" or "-1" is displayed, it indicates an over range
situation and a higher range has to be selected.
2. When the value to be measured is unknown beforehand, set the range
selector to the highest position.
3. " " means you cannot input a voltage that is more than 200mA or
10A depending on the socket used. Excess current will blow the fuse.