Velleman LAB1 - Manual (Page 9)

9
5. RESISTANCE
Range Resolution Accuracy
200 Ω 0.1 Ω ±0.8% of rdg ± 2 digits
2k Ω 1 Ω ±0.8% of rdg ± 2 digits
20k Ω 10 Ω ±0.8% of rdg ± 2 digits
200k Ω 100 Ω ±0.8% of rdg ± 2 digits
2M Ω 1k Ω ±1.0% of rdg ± 2 digits
Maximum open circuit voltage : 3.2V
Overload protection : 250Vdc or rms ac for all ranges.
6. TRANSISTOR hFE TEST (0-1000)
Range Tested range Tested current Tested voltage
NPN & PNP 0-1000 Ib = 10µA Vcd = 3V
OPERATING INSTRUCTIONS
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.
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
3. AC
VOLTAGE MEASUREMENT
1. Connect the red test lead to the "V ΩmA" jack and the black test lead to the "COM" jack.
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.
4. RESISTANCE
1. Connect the red test lead to the "V ΩmA" 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.
Digital multimeter