Velleman DVM030 Bedienungsanleitung Seite 15

2. To improve the accuracy of measurement less than 10nF, subtract the
residual capacitance of the meter and test leads.
10.6 FREQUENCY (DUTY CYCLE) MEASUREMENT
To avoid electric shock, do not apply more than 250V DC or 250V
AC rms before taking frequency measurement.
1. Set the rotary switch to Hz/% position.
2. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive Hz jack
3. Touch the test lead tips to the circuit under test.
4. Read the frequency value in the LCD display.
5. Press the FUNC button to indicate "%"
6. Read the % duty cycle in the LCD display.
10.7 TRANSISTOR hFE TEST
To avoid electric shock, do not apply more than 36VDC or 36V AC
rms between hFE terminal and the COM terminal.
1. Set the rotary switch to hFE range
2. Connect the COM and "+" plug of the special multi-function socket to
the COM and V 
3. Determine whether the transistor under test is NPN or PNP type and
located the emitter, base and collector leads.
4. Insert leads to the transistor into proper holes of the special multi-
function socket.
5. The meter will show the approx. hFE value in LCD display.
10.8 NCV (NON-CONTACT VOLTAGE) DETECTION
Due to external interference source, this function may cause wrong
voltage detection, the detection result is for reference only.
1. Set the rotary switch to NCV position and LCD display EF, contact the
top part of meter with the circuit under test, the indicating LED will
flash and audible signal will sound, the signal strength showed in LCD
display.
Notes
V. 01 – 04/05/2023
DVM030
hFE Hz input jack.
15 ©Velleman Group nv