Velleman DVM68 Uživatelský manuál stáhnout pdf (Strana 8)

DVM68

25.02.2011

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:

µA

mA jack max.

00mA; for measurements up to 10A use the

10A jack. When measuring currents above 5A, max. 15s continu

ous measurement followed

by a 10 minutes break between 2 measurements.

Alway

s 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 3

00mA

•

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

the 10A-range is protected against over-current with a F10A 25

0V fuse

• When measuring above 5A, max. 15s continu

ous measurement followed by a 10

break between 2 measurements.

• When the measured value is higher than the selected range li

mit, 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 3.26M

Ω 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

©Velleman nv

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

µA

mA" 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,

0V 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 c

ircuit, the

Do not perform continuity or diode measurements on live circuits.

jack and the red test lead to the

VΩF jack.

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