Velleman DCM266 Operation Manual - page 7
DCM266 GB
6
3.3 Measuring voltage
1. Connect the black test lead to the COM jack and the red test lead to the V
Ω
jack.
2. Set the rotary switch at the desired DCV or ACV range position and connect
test leads across the source or load under measurement.
The polarity of the red lead connection will be indicated along with the
voltage value when making DC voltage measurement.
3. When only the figure " 1" is displayed, it indicates overrange situation and
the higher range has to be selected.
3.4 Measuring resistance
1. Connect the black test lead to the COM jack and the red test lead to the V
Ω
jack.
2. Set the rotary switch at desired
Ω
position and connect test leads across the
resistor under measurement.
NOTE :
1. If the resistance being measured exceeds the maximum value of the range
selected or the input is not connected, an overrange indication " 1" will be
displayed.
2. When checking in-circuit resistance, be sure the circuit under test has all
power removed and that all capacitors have been discharged fully.
3.5 Continuity test
1. Connect the black test lead to the COM jack and the red test lead to the V
Ω
jack. ( The polarity of the red lead is positive " +")
2. Set the rotary switch at
position and connect test leads across two points
of the circuit under testing. If continuitiy exists ( i.e., resistance less than
about 50
Ω
), built-in buzzer will sound.