Velleman ECM330 - Manual (Page 5)

ECM330 PEREL 5
• AC/DC Voltage Measurement
o Insert the black test lead into the negative COM terminal
and the red test lead into the positive V terminal.
o Set the function switch to V range.
o Select the AC or DC mode with the MODE button.
o Connect the test leads in parallel with the circuit to be
measured.
o Read the displayed value.
• Resistance and Continuity Measurement
o Insert the black test lead into the negative COM terminal
and the red test lead into the positive V terminal.
o Set the function switch to Ω range.
o Select the resistance mode with the MODE button.
o Connect the test leads with the circuit or the component to
be measured. It is best to disconnect one side of the device
under test so the rest of the circuit will not interfere with the
resistance reading.
o Read the displayed value. A resistance < 120Ω will sound
when measuring continuity.
• Diode Measurement
o Insert the black test lead into the negative COM terminal and the red test lead into
the positive V terminal.
o Set the function switch to Ω range.
o Select the diode mode with the MODE button.
o Connect the test leads with the diode to be measured. The forward voltage will
indicate 0.4V ~ 0.7V. Reverse voltage will indicate “OL”. Shorted devices will
indicate near 0mV and an open device will indicate “OL” in both polarities.
• Data Hold Function
o Press HOLD to freeze the value onto the display. Press again to resume normal
operation.
• MAX Hold
o Press MAX to freeze the highest value onto the display. Press again to resume
normal operation.
• Manual Ranging
o Press the RANGE button to set the range manually. Press and hold the button to
return to the auto ranging mode.
red black black red
probe probe
probe probe
forward test reverse test