Velleman DVM990BL - Manual (Page 11)

DVM990BL VELLEMAN 10
4.6. MEASURING RESISTANCE
4.6.1. Connect the black test lead to the COM socket and the red test lead to
the V/
Ω
socket.
4.6.2. Set the rotary switch to the desired
Ω
range.
4.6.3. Connect the test leads across the resistance under measurement.
4.6.4. You can see the reading on the LCD.
NOTE:
1.
When only the figure "1" is displayed, it indicates an over range
situation and the higher range has to be selected.
2. When measuring resistance above 1 M
Ω
, the meter may take a few
seconds to get a stable reading.
3. When the input is not connected, i.e. an open circuit, the figure "1" will
be displayed for the over range condition.
4. When measuring in-circuit resistance, be sure that the circuit under
test has all power removed and that all capacitors have been fully
discharged.
5. At 200 M
Ω
range, the display reading is around 10 (1 M
Ω
) when the
test leads are shorted. This has to be subtracted from the measured
results. For example, when measuring 100 M
Ω
resistance the display
reading will be 101.0 and the correct result should be
101.0 - 1.0 = 100.0 M
Ω
4.7. MEASURING
CAPACITANCE
4.7.1. Connect the black test lead to the COM socket and the red test lead to
the V/
Ω
socket.
4.7.2. Set the rotary switch to the desired F range.
4.7.3. Before inserting capacitors into the capacitance test socket, be sure
that the capacitor has been fully discharged.
4.7.4. You can see the reading on the LCD.
4.7.5. When frequent capacitor testing is required, put the capacitor test unit
plug (spare parts) into COM and V/
Ω
and put the capacitor leads into
the two long sockets of the capacitor test unit, and capacitor testing is
ready.
WARNING
To avoid electric shock, remove the test leads from the circuit under
test before measuring the capacitance of a capacitor.