Voltage Measurements; Resistance Measurements - Velleman DVM4200 Bedienungsanleitung

7.1

Voltage measurements

Do not measure circuits where voltages > 600V CAT IV or > 1000V
CAT III may reside.
Always be careful when working with voltages above 60Vdc or 30Vac rms.
Keep your fingers behind the probe barriers at all times during
measurement. Do not touch unused terminals when the meter is linked to a
circuit which is being tested.
 Connect the red test lead to the "VΩ
jack.
 Set the rotary switch to V
 Press the SELECT button to choose between AC or DC measurement.
 Press the RANGE button to manually select the range.
 Connect the test probes to the source being measured.
 The measured value appears on the LCD display.
Notes:
 For DC-measurements, when a negative polarity is present at the red test lead,
the indicated value is preceded by a "-" sign.
 When measuring DC offset of an AC voltage, measure the AC voltage first and
select a range for the DC offset equal to or higher than the AC range to increase
accuracy.
7.2

Resistance measurements

Do not perform resistance measurements on live circuits.
 Connect the red test lead to the "VΩ
jack.
 Set the rotary switch to "
MΩ is shown on the display.
 Press the RANGE button to manually select the range.
 Connect the test probes to the source being measured.
 The measured value appears on the LCD display.
 Notes:
o Never perform resistance measurements on a live circuit and make sure all
capacitors are completely depleted.
o To increase accuracy when measuring low resistance values, first hold the tips
of the measuring probes together to determine the resistance value of the test
leads. Subtract this value from the measured value of the circuit.
o For resistance measurements above 10MΩ the meter needs a few seconds to
stabilize the read-out.
o Should the measured resistance exceed the current range or in case of an open
circuit, the display will show "OL".
7.3 Continuity measurements
Do not perform continuity measurements on live circuits.
 Connect the red test lead to the "VΩ
jack.
 Set the rotary switch to
 Press the SELECT button to select continuity test
 Connect the test probes to the source being measured.
 When the measured resistance is less than 30Ω a continuous beep is produced
and the resistance value is showed on the display. Should the measured
resistance exceed the current range or in case of an open circuit, the display will
show "OL".
Note: Never perform continuity measurements on a live circuit and make sure all
24.06.2015
DVM4200
" jack and the black lead to the "COM"
" jack and the black lead to the "COM"
 ". When necessary, press the SELECT button until
" jack and the black lead to the "COM"
Ω .
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