Velleman DVM850BL User Manual - page 7
DVM850BL GB
6
5.5. RESISTANCE
Range Resolution
Accuracy
200
Ω 0.1Ω
±0.8% of rdg ± 2 digits
2k
Ω
1
Ω
±0.8% of rdg ± 2 digits
20k
Ω 10Ω
±0.8% of rdg ± 2 digits
200k
Ω 100Ω
±0.8% of rdg ± 2 digits
2M
Ω 1kΩ
±1.0% of rdg ± 2 digits
Maximum open circuit voltage : 3.2V
Overload protection : 250Vdc or rms ac for all ranges.
5.6. TRANSISTOR hFE TEST (0-1000)
Range
Tested range
Tested current
Tested voltage
NPN & PNP
0-1000
Ib = 10µA
Vcd = 3V
6. OPERATING INSTRUCTIONS
6.1. DC VOLTAGE MEASUREMENT
1. Connect the red test lead to the "V
ΩmA" jack and the black lead to the "COM" jack.
2. Set the rotary switch in the desired DCV position. If the voltage to be measured is unknown
beforehand, you should set the range switch in the highest range position and then reduce
gradually until the ideal resolution is obtained.
3. Connect the test leads to the source being measured.
4. Read the voltage value on the LCD display along with the polarity of the red lead
connection.
6.2. DC CURRENT MEASUREMENT
1. Connect the red test lead to the "V
ΩmA" jack and the black test lead to the "COM" jack
(switch the red lead to the "10A" jack for measurements between 200mA and 10A).
2. Set the rotary switch (DCA) in the desired position.
3. Open the circuit in which the current is to be measured and connect the test leads to the
circuit IN SERIES.
4. Read the current value and the polarity of the red lead connection on the LCD display