Velleman DVM 68 Operation Manual - page 6
VELLEMAN GB
5
Remarks :
1) For resistance above 3.26M
Ω
, it 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 overrange 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
mA/Cx jack.
2) Set the function switch at nF or µF position to be used.
3) Connect test leads across the capacitor under measurement and be sure that the
polarity of connection is observed.
Remarks :
1) When checking in-circuit capacitance, be sure that the circuit has all power
removed and all capacitor are fully discharged.
2) The range control mode in capacitance measurement is manual ranging and only
two ranges (326nF, 32.6µF) are provided.
3) If Range Control Button is used in this measuring function, decimal points may be
at incorrect positions.
4) At the nF range, when the capacitor to be measured is not connected to test leads,
the LCD may not read zero, but a few counts. These count have to be substracted from
measuring results.
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 Hz position and connect test leads across the source
or load under measurement.
Remark :
The input voltage should be between 200mV and 10V rms AC. If the voltage is more
than 10V rms, reading may be out of the accuracy range.
3.6 Continuity & Diode Test
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
/
position and push the
/
button to select
continuity or diode test mode.
3) In continuity testing, if continuity exists (i.e. resistance less than about 50
Ω
), built-
in buzzer will sound.
4) If diode test mode is selected, connect the red and black to the anode and cathode
of the diode under test. The forward voltage drop of this diode in V will be displayed.