Frequency Measurements - Velleman DVM68 Bedienungsanleitung

Continuity test
•
Press the /
•
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 /
•
Connect the red test lead to the anode; connect the black test lead to the cathode of 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 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 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. Consider 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 F.
•
Connect the test probes to the capacitor. Mind the polarity when measuring polarized
capacitors.
•
The capacitance value is shown on the display.
Notes:
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 The range control mode in capacitance measurement is manual ranging and only two
o
ranges (326nF, 32.6 F) are provided.
If Range Control Button is used in this measuring function, decimal points may be at If Range Control Button is used in this measuring function, decimal points may be at
o
incorrect positions.
At the nF range, when the capacitor to be measured is not connected to test leads, the At the nF range, when the capacitor to be measured is not connected to test leads, the
o
LCD may not read zero, but a few counts. These counts have to be substracted from
measuring results.
When the capacity is higher than the measuring range, the display shows 'OL'. 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 Never perform capacitance measurements on a live circuit and make sure all capacitors
o
are completely depleted.

7.6 Frequency measurements

Do not perform frequency measurements in circuits with voltages > Do not perform frequency measurements in circuits with voltages > 600V CAT
III of 1000V CAT II
Always be careful when working with voltages above 60Vdc or 30Vac rms. Keep your 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. terminals when the meter is linked to a circuit which is being tested.
•
Connect the red test lead to the "V F" 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:
The input voltage should be between 200mV and 10V rms AC. If the voltage is more than The input voltage should be between 200mV and 10V rms AC. If the voltage is more than
o
10V rms, reading may be out of the accuracy range.
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. Use a shielded cable for measuring small signals in a noisy environment.
o
25.02.2011
.button until the
is showed on the display. Should the measured resistance exceed the
.button until the
DVM68
symbol appears on the display.
Ω a continuous beep is produced and the
symbol appears on the display.
" jack and the black lead to the "COM" jack.
polarity when measuring polarized
. This is normal behavior.
all times during measurement. Do not touch unused
" jack and the black lead to the "COM" jack.
9
".
have to be substracted from
he display shows 'OL'.
Rev. 01
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