Measuring Capacitance; Measuring Frequency; Transistor Test - Velleman DVM68 Notice D'emploi

3.4 Measuring Capacitance

1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the mA/Cx jack.
2) Set the function switch at nF or µ F position to be used.
3) Connect test leads across the capacitor under measurement and be sure that the polarity of connection is
observed.
Remarks :
1) When checking in-circuit capacitance, be sure that the circuit has all power removed and all capacitor are fully
discharged.
2) The range control mode in capacitance measurement is manual ranging and only two ranges (326nF, 32.6µ F) are
provided.
3) If Range Control Button is used in this measuring function, decimal points may be at incorrect positions.
4) At the nF range, when the capacitor to be measured is not connected to test leads, the LCD may not read zero,
but a few counts. These count have to be substracted from measuring results.

3.5 Measuring Frequency

1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the V/Ω/F jack.
2) Set the function switch at the Hz position and connect test leads across the source or load under measurement.
Remark :
The input voltage should be between 200mV and 10V rms AC. If the voltage is more than 10V rms, reading may be
out of the accuracy range.
3.6 Continuity & Diode Test
1) Connect the black test lead to the COM jack and the red test lead to the V/Ω/F jack.
2) Set the function switch at
3) In continuity testing, if continuity exists (i.e. resistance less than about 50Ω), built-in buzzer will sound.
4) If diode test mode is selected, connect the red and black to the anode and cathode of the diode under test. The
forward voltage drop of this diode in V will be displayed.

3.7 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 10 µ A and Vce 3.2V.
Specifications
4.
Accuracy is specified for a period of one year after calibration and at 18°C to 28°C with relative humidity to 80%.
4.1 General
Max. voltage between terminal and earth
Display
Fuse protection
Power Supply
Ranging method
Polarity indication
DVM68
/ position and push the
1000V DC or 750V AC rms (sinus)
3 ¾ digit LCD, 3260 counts max,
2-3 readings / sec
µ A & mA range : F 300mA/250V
A range : F 10A/250V
9V battery
Auto / Manual
" - " displayed
/ button to select continuity or diode test mode.
- 6 - VELLEMAN