Velleman DVM850BL User Manual - page 8
DVM850BL GB
7
6.3. AC VOLTAGE MEASUREMENT
1. Connect the red test lead to the "V
ΩmA" jack and the black test lead to the "COM" jack.
2. Set the rotary switch in the appropriate ACV position.
3. Connect the test leads to the source to be measured.
4. Read the voltage value on the LCD display.
6.4. RESISTANCE
1. Connect the red test lead to the "V
ΩmA" jack and the black test lead to the "COM" jack (the
red lead has a positive polarity "+").
2. Set the rotary switch in the appropriate "
Ω" range position.
3. Connect the test leads to the resistor to be measured and read the LCD display.
4. If the resistance being measured is connected to a circuit, turn off the power and discharge
all capacitors before applying the test probes.
6.5. DIODE TEST
1. Connect the red test lead to "V
ΩmA" jack and the black one to the "COM" jack (the red lead
has a positive polarity "+".).
2. Set the rotary switch in the "
" position.
3. Connect the red test lead to the anode of the diode to be tested and the black test lead to the
cathode of the diode. The approx. forward voltage drop of the diode will be displayed. If the
connection is reversed, the display will merely show a "1".
6.6. TRANSISTOR TEST
1. Set the rotary switch in the "hFE" position.
2. Determine whether the transistor under testing is NPN or PNP and locate the emitter, base
and collector leads. Insert the leads into the proper holes of the hFE-socket on the front
panel.
3. Read the approximate hFE-value obtained under the following test conditions : a base
current of 10µA and Vce 3V.