Velleman DVM68N, User Manual

Page: 7 / 43

DVM68N VELLEMAN 7
3.5 Measuring Frequency
1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the V/
Ω
/F/Cx 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 600mV and 3V rms AC. If the voltage is more than 10V rms, reading may be
out of the accuracy range.
Max. input voltage: 250V.
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/Cx jack.
2) Set the function switch at / position and push the / button to select continuity or diode test mode.
3) In continuity testing, if continuity exists (i.e. resistance less than about 50
Ω
), 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 2.8V.
4. Specifications
Accuracy is specified for a period of one year after calibration and at 18°C to 28°C with relative humidity to 75%.
4.1 General
Max. voltage between terminal and earth 1000V DC or 750V AC rms (sinus)
Display 3 ¾ digit LCD, 3 readings / sec
Fuse protection µ A & mA range : F 500mA/250V Ø5x20
A range : F 10A/250V Ø6.3x32
Power Supply 9V battery (type 6F22)
Ranging method Auto / Manual
Polarity indication " - " displayed
Overrange indication " OL " displayed automatically
Low Battery indication
" " displayed
Operating temperature 0°C to 40°C (32°F to 122°F)
Storage temperature -10°C to 60°C (14°F to 140°F)
Dimensions 91 x 189 x 31.5 mm
Weight 310 g (incl. battery)
4.2 DC Voltage
Range Resolution Accuracy
400mV 0.1mV
4V 1mV
40V 10mV
400V 100mV
± (0.7% of rdg + 2 digits)
1000V 1V ± (0.8% of rdg + 2 digits)
Input impedance: 10M
Ω
Max. input voltage: 1000V DC or 750V AC rms