Velleman DVM68 - Manual (Page 9)

DVM68
25.02.2011 9
Continuity test
• Press the / .button until the symbol appears on the display.
•
Connect the test leads to the circuit under test.
• When the measured resistance is less than 50Ω a continuous beep is produced and the
resistance value is showed on the display. Should the measured resistance exceed the
selected range or in case of an open circuit, the display will show “OL”.
Diode test
• Press the / .button until the symbol appears on the display.
• Connect the red test lead to the anode; connect the black test lead to the cathode of the
diode. The meter will display the approximate forward voltage drop. If the lead connection is
reversed, the meter will display “OL”.
Notes:
•
Never perform continuity or diode measurements on a live circuit and make sure all
capacitors are completely discharged.
• Measuring diodes that are part of a circuit might produce faulty results.
disconnecting them from the circuit.
7.5 Capacitance measurements
Do not perform capacitance measurements on live circuits.
• Connect the red test lead to the "mA Cx" jack and the black lead to the "COM" jack.
• Set the rotary switch to nF or µF.
•
Connect the test probes to the capacitor. Mind the polarity when measuring polarized
capacitors.
• The capacitance value is shown on the display.
Notes:
o
It takes a few seconds before the meter stabilizes. This is normal behavior.
o The range control mode in capacitance measurement is manual ranging and only t
ranges (326nF, 32.6µF) are provided.
o If Range Control Button is used in this measuring function, decimal points may be at
incorrect positions.
o 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 counts have to be substracted from
measuring results.
o When the capacity is higher than the measuring range, the display shows ‘OL’.
o Never perform capacitance measurements on a live circuit and make sure all capacitors
are completely depleted.
7.6 Frequency measurements
Do not perform frequency measurements in circuits with voltages >
III of 1000V CAT II
Always be careful when working with voltages above 60Vdc or 30Vac rms. Keep your
fingers behind the probe barriers at all times during measurement.
terminals when the meter is linked to a circuit which is being tested.
•
Connect the red test lead to the "VΩF" jack and the black lead to the "
• Set the rotary switch to Hz.
• Connect the test probes to the circuit.
• The frequency is shown on the display.
Notes:
o
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.
o When the frequency is higher than the measuring range, the display shows ‘OL’.
o
Use a shielded cable for measuring small signals in a noisy environment.
Rev. 01
©Velleman nv
Ω a continuous beep is produced and the
is showed on the display. Should the measured resistance exceed the
”.
Connect the red test lead to the anode; connect the black test lead to the cathode of the
diode. The meter will display the approximate forward voltage drop. If the lead connection is
Never perform continuity or diode measurements on a live circuit and make sure all
Measuring diodes that are part of a circuit might produce faulty results. Consider
" jack and the black lead to the "COM" jack.
polarity when measuring polarized
. This is normal behavior.
The range control mode in capacitance measurement is manual ranging and only two
If Range Control Button is used in this measuring function, decimal points may be at
At the nF range, when the capacitor to be measured is not connected to test leads, the
have to be substracted from
When the capacity is higher than the measuring range, the display shows ‘OL’.
Never perform capacitance measurements on a live circuit and make sure all capacitors
Do not perform frequency measurements in circuits with voltages > 600V CAT
Always be careful when working with voltages above 60Vdc or 30Vac rms. Keep your
all times during measurement. Do not touch unused
terminals when the meter is linked to a circuit which is being tested.
" jack and the black lead to the "COM" jack.
The input voltage should be between 200mV and 10V rms AC. If the voltage is more than
he display shows ‘OL’.
Use a shielded cable for measuring small signals in a noisy environment.