Velleman DVM68 - Manual (Page 8)

DVM68
25.02.2011 8
Notes:
•
For DC-measurements: when a negative polarity is present at the red test lead, the
indicated value is preceded by a “-” sign.
• When the measured value is higher than the selected range limit, the display will show
“OL”. Select a higher range.
7.2 Current measurements
Do not measure current in circuits with voltages > 250V
Current measurements: µAmA jack max. 300mA; for measurements up to 10A use the
10A jack. When measuring currents above 5A, max. 15s continuous measurement followed
by a 10 minutes break between 2 measurements.
Always be careful when working with voltages above 60Vdc or 30Vac rms. Keep your
fingers behind the probe barriers at all times during measurement.
•
For measurements up to 300mA: connect the red test lead to the "µA
black lead to the "COM" jack.
•
For measurements up to 10A: connect the red test lead to the "10A
lead to the "COM" jack.
• Set the function selector to A for measurements up to 10A on the 10A jack.
• Set the function selector to mA or µA for measurements up to 300mA
•
When the range is unknown, always select the highest possible range and lower to the
appropriate range.
• Connect the test probes in series with the circuit.
• Read the measured value from the display.
• When desired, select a range manually with the RANGE button.
Notes:
•
For DC-current measurements, when a negative polarity is present at the red test lead,
the indicated value is preceded by a “-” sign.
• The µAmA-range is protected against over-current with a F300mA 25
the 10A-range is protected against over-current with a F10A 250V fuse
• When measuring above 5A, max. 15s continuous measurement followed by a 10
break between 2 measurements.
• When the measured value is higher than the selected range limit, the display will show
“OL”. Select a higher range.
7.3 Resistance measurements
Do not perform resistance measurements on live circuits.
Make sure all capacitors in the circuit are discharged.
• Connect the red test lead to the "VΩF" jack and the black lead to the "
•
Set the rotary switch to the Ω range.
• Connect the test probes to the circuit/component under test.
• The measured value appears on the display.
•
When desired, select a range manually with the RANGE button.
Notes:
o Never perform resistance measurements on a live circuit and make sure all capacitors are
completely discharged.
o For resistance measurements above 3.26MΩ the meter needs a few seconds to stabilize the
read-out.
o Should the measured resistance exceed the selected range or in case of an open c
display will show “OL”.
7.4 Continuity & diode test
Do not perform continuity or diode measurements on live circuits.
Make sure all capacitors in the circuit are discharged.
• Connect the black test lead to the COM jack and the red test lead to the
• Set the rotary selector to / .
Rev. 01
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polarity is present at the red test lead, the
When the measured value is higher than the selected range limit, the display will show
00mA; for measurements up to 10A use the
ous measurement followed
s be careful when working with voltages above 60Vdc or 30Vac rms. Keep your
µAmA" jack and the
10A" jack and the black
on the 10A jack.
00mA on the µAmA jack.
When the range is unknown, always select the highest possible range and lower to the
current measurements, when a negative polarity is present at the red test lead,
250V fuse (Ø5x20mm),
0V fuse (Ø6.3x30mm).
ous measurement followed by a 10 minutes
mit, the display will show
black lead to the "COM" jack.
resistance measurements on a live circuit and make sure all capacitors are
Ω the meter needs a few seconds to stabilize the
in case of an open circuit, the
Do not perform continuity or diode measurements on live circuits.
jack and the red test lead to the VΩF jack.