Velleman DVM66 Operation manual - page 10
VELLEMAN GB
9
3.3 Measuring Resistance
1. Connect the black test lead to the COM jack and the red teas lead to the
V/
Ω
/F jack. (NOTE : The polarity of the red lead connection is positive “+”)
2. Set the function switch at
Ω
range to be used and connect test leads across the
resistance under measurement.
NOTE :
1. For resistance above 4M
Ω
, the meter may take a few seconds to stabilize
reading. This is normal for high resistance measuring.
2. When the input is not connected, i.e. at open circuit, the figure “OL” will be
displayed for the over range condition.
3. When checking in-circuit resistance, be sure the circuit under test has all
power removed and all capacitors are fully discharged.
3.4 Measuring Capacitance
1. Connect the black test lead to the COM jack and the red test lead to the V/
Ω
/F
jack. (NOTE: The polarity of the red lead connection is positive "+").
2. Set the function switch at
position.
3. Connect test leads across the capacitor under measurement and be sure that
the polarity of connection is observed.
4. When rest leads are not connected to a capacitor, the LCD may not show zero
but a few digits, this is normal for the stray capacitance of test leads and input
circuit of the meter always exists. These digits can be deleted by using Rel.
Operating mode before applying test leads.
3.5 Measuring Frequency
1. Connect the black test lead to the COM jack and the red test lead to the V/
Ω
/F
jack.
2. Set the function switch at the FREQ. Position and connect test leads across
the source or load under measurement.
NOTE :
The input voltage should be between 1V and 10V rms ac. If the voltage is
more than 10V rms, reading may be out of the accuracy range.