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Velleman DVM9912 Manual

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DVM9912 VELLEMAN
7
AC CURRENT MEASUREMENTS
1. Insert the black test lead banana plug into the negative (COM) jack.
2. For current measurements up to 4000µA AC, set the function switch to the µA position and insert the red
test lead banana plug into the (µ A) jack.
3. For current measurements up to 400mA AC, set the function switch to the mA range and insert the red test
lead banana plug into the (mA) jack.
4. For current measurements up to 10A AC, set the function switch to the A position and insert the red test
lead banana plug into the 10A jack.
5. Press the MODE button until “AC” appears in the display.
6. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure
current.
7. Touch the black test probe tip to the negative side of the circuit. And touch the red test probe tip to the
positive side of the circuit.
8. Apply power to the circuit.
9. Read the current on the display. The display will indicate the proper decimal point, value and symbol.
RESISTANCE MEASUREMENTS
1. Set the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana plug into
the positive Ω jack.
3. Touch the test probe tips across the circuit or part under test. It is best to disconnect one side of the part
under test so the rest of the circuit will not interfere with the resistance reading.
4. Read the resistance on the display. The display will indicate the proper decimal point, value and symbol.
CONTINUITY CHECK
1. Set the function switch to the
position.
2. Insert the black lead banana plug into the negative (-) jack (COM) and the red test lead banana plug into
the positive (+) jack (Ω).
3. Press the MODE button until the symbol appears on the display.
4. Touch the test probe tips to the circuit or wire you wish to check.
If the resistance is less than approximately 30 Ω, the audible signal will sound. The display will also show
the actual resistance.
WARNING:
To avoid electric shock, do not measure AC current on any circuit with a voltage exceeding
250V AC.
CAUTION:
Do
not carry out current measurements on the 10A scale fo
r a period longer than 30
seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads.
WARNING:
To avoid electric shock, disconnect power to the unit under test and discharge all
capacitors before taking any resistance measurements. Remove the batteries and unplug
the line cords.
WARNING:
To
avoid electric shock, never measure continuity on circuits or wires that have voltage on
them
.
… 7 …


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