Velleman DVM66 Operation manual - page 11
VELLEMAN GB
10
3.6 Continuity Test
1. Connect the black test lead to the COM jack and the red test lead to the V/
Ω
/F
jack. (NOTE: The polarity of red lead connection is positive “+”)
2. Set the function switch at
Ω
position and push the AC-DC/
button to set
up continuity testing mode.
3. If continuity exists (i.e., resistance less than 5% of full scale), built-in buzzer
will sound.
3.7 Diode Test
1. Connect the black test lead to the COM jack and the red test lead to the V/
Ω
/F
jack. (NOTE: The polarity of red lead connection is positive “+”)
2. Set the function switch at
position.
3. Connect red test lead to the anode of the diode to be tested and black test lead
to the cathode. The meter will show the approximate forward voltage of the
diode.
3.8 Transistor Test
1. Set the function switch at hFE position.
2. Identify whether the transistor is NPN or PNP type and locate emitter, base
and collector lead. Insert leads of the transistor to be tested into proper holes
of the testing socket on the front panel.
3. LCD display will show the approximate hFE value at the test condition of
base current 10µA and Vce 3.0V.
3.9 Auto Power Off
To extend the battery life, Auto Power Off function is provided. If no key
operations or range changing happen for 20 to 40 minutes (According to the
function selected), the meter will be turned off automatically. To turn it on,
rotate the rotary switch or push any function buttons only.