Velleman DVM851 - Manual (Page 8)

DVM851
01.08.2012 8
10.3 AC VOLTAGE MEASUREMENT
Do not measure circuits that may contain voltages > 600V
Use extreme caution when measuring voltages higher than 60Vdc or 30Vac rms.
Always place your fingers behind the protective edges of the test probes while measuring!
1. Connect the red test lead to the "V Ω mA" jack and the black test lead to the "COM"
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.
10.4 RESISTANCE
Do not conduct resistance measurements on live circuits. Make sure all
are depleted.
1. Connect the red test lead to the "V Ω mA" 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.
10.5 DIODE TEST
Do not conduct diode- or continuity measurements on live circuits. Make sure all capacitors in
the circuit are depleted.
1. Connect the red test lead to "V Ω mA" 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".
10.6 TRANSISTOR TEST
Do not conduct transistor measurements on live circuits. For transistor test use the included
adaptor socket.
1. Connect the black test lead (-) to the "COM" jack and the red test lead (+) to the "mA" jack.
2. Set the rotary switch in the "hFE" position.
3. Determine whether the transistor is of the NPN- or PNP-type and locate the emitter, the base and the
collector. Insert the leads into the proper holes in the included transistor socket.
4. Connect the black test lead (-) to the "COM" terminal and the red test lead (+) to the other terminal
of the transistor socket.
5. The display will show the approximate hFE-value at the moment of testing. Base current 10µA, Vce
3V.
10.7 AUDIBLE CONTINUITY TEST
Do not conduct diode- or continuity measurements on live circuits. Make sure all capacitors in
the circuit are depleted.
1. Connect the red test lead to "V Ω mA" and the black one to "COM".
2. Set the range switch in the " " position.
3. Connect the test leads to two points of the circuit to be tested. If continuity exists, the built
will sound.
11. Battery & fuse Replacement
WARNING: To avoid electrical shock always disconnect the test leads prior to opening the
housing. To prevent fire hazards, only use fuses with the same ratings as spec
manual.
Remark: refer to the warning on the battery compartment
There are no user-serviceable parts inside the device.
Refer to an authorized dealer for service and/or spare parts.
Disconnect the test leads from the test points and remove the test leads from the measuring
terminals before replacing the batteries or fuses.
• When" " is displayed, the battery should be replaced.
©Velleman nv
Use extreme caution when measuring voltages higher than 60Vdc or 30Vac rms.
Always place your fingers behind the protective edges of the test probes while measuring!
mA" jack and the black test lead to the "COM" jack.
Make sure all capacitors in the circuit
mA" jack and the black test lead to the "COM" jack (the red lead
est leads to the resistor to be measured and read the LCD display.
If the resistance being measured is connected to a circuit, turn off the power and discharge all
Make sure all capacitors in
mA" jack and the black one to the "COM" jack (the red lead has a
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
Do not conduct transistor measurements on live circuits. For transistor test use the included
) to the "COM" jack and the red test lead (+) to the "mA" jack.
type and locate the emitter, the base and the
collector. Insert the leads into the proper holes in the included transistor socket.
terminal and the red test lead (+) to the other terminal
value at the moment of testing. Base current 10µA, Vce
Make sure all capacitors in
If continuity exists, the built-in buzzer
disconnect the test leads prior to opening the
To prevent fire hazards, only use fuses with the same ratings as specified in this
ove the test leads from the measuring