Velleman DCM268N - Manual (Page 5)

DCM268N
00 (28/11/2008) 5 Velleman ®
AC (TRUE RMS)/DC VOLTAGE MEASUREMENT
• Connect the red test lead to the V·Ω·CAP·TEMP·HZ jack [11] and the black lead to the
COM jack [10].
• Set the rotary function switch [3] in the position.
• Use the mode button [5] to choose between AC and DC voltage.
• Connect the test leads parallel to the source being measured.
• Read the voltage value on the LCD display [9] along with the polarity of the red lead
connection.
• For AC measurement, press the peak hold button [6] to hold either maximum or
minimum measured value (see Peak hold function).
AC (TRUE RMS)/DC CURRENT MEASUREMENT
• Make sure no test leads are connected to the V·Ω·CAP·TEMP·HZ jack [11] or COM jack
[10].
• Set the rotary switch [3] in the desired range ( , or ). If the
current to be measured is unknown beforehand, set the range switch in the highest range
position and then reduce gradually until the ideal resolution is obtained.
• Use the mode button [5] to choose between AC and DC current.
• For DC current measurements, press the DCA zero button [7] once to reset the display to
zero for relative measurements (indicated with in the display).
• Press the trigger [2] to open the jaws [1] of the clamp. Enclose a single conductor within
the clamp and release the trigger [2]. Enclosing multiple conductors at the same time will
result in faulty measurements. For accurate measurements, always keep the jaws closed
during measuring.
• Read the current value on the LCD display.
• Note that when measuring large currents, a buzzing sound may be heard coming from the
jaws. This is normal behaviour which does not influence the measurement accuracy.
RESISTANCE, AUDIBLE CONTINUITY and DIODE TEST
• Connect the red test lead to the V·Ω·CAP·TEMP·HZ jack [11] and the black lead to the
COM jack [10].
• Set the rotary switch [3] in the position.
• Make sure there is no voltage on the circuit/component under test.
• For resistance test press the mode button [5] until the Ω symbol appears (default) in the
display. Connect the test leads to the resistor to be measured and read the value in the
LCD display. Disconnect one side of the device under test to avoid interference from the
rest of the circuit.
• For continuity test, press the mode button [5] until the symbol appears in the
display. Connect the test leads to the circuit to be measured and read the value in the
LCD display. When the resistance is <35Ω, a continuity buzzer will sound.
Note: test current: <1mA
• For diode/transistors/ semiconductors/… measurements, press the mode button [5] until
the symbol appears in the display. During measurement, a current is sent through
the semiconductor junction and the voltage drop is measured. When the junction passes
the test, indicated forward voltage will be 0.4~0.9V while reverse voltage will indicate
“OL”. When the diode is short circuited, both readings will be ±0mV; when open, both
measurements will show “OL”.
Note: forward DC current: 0.3mA typical, open circuit voltage: 1.5VDC
CAPACITY TEST
• Connect the red test lead to the V·Ω·CAP·TEMP·HZ jack [11] and the black lead to the
COM jack [10].
• Set the rotary switch [3] in the position.