Velleman DVM990BL Operations Instructions download pdf (Page 11)

DVM990BL VELLEMAN 10

4.6. MEASURING RESISTANCE

4.6.1. Connect the black test lead to the COM socket and the red test lead to

the V/Ω socket.

4.6.2. Set the rotary switch to the desired Ω range.

4.6.3. Connect the test leads across the resistance under measurement.

4.6.4. You can see the reading on the LCD.

NOTE:

1. When only the figure "1" is displayed, it indicates an over range

situation and the higher range has to be selected.

2. When measuring resistance above 1 MΩ, the meter may take a few

seconds to get a stable reading.

3. When the input is not connected, i.e. an open circuit, the figure "1" will

be displayed for the over range condition.

4. When measuring in-circuit resistance, be sure that the circuit under

test has all power removed and that all capacitors have been fully

discharged.

5. At 200 MΩ range, the display reading is around 10 (1 MΩ) when the

test leads are shorted. This has to be subtracted from the measured

results. For example, when measuring 100 MΩ resistance the display

reading will be 101.0 and the correct result should be

101.0 - 1.0 = 100.0 MΩ

4.7. MEASURING CAPACITANCE

4.7.1. Connect the black test lead to the COM socket and the red test lead to

the V/Ω socket.

4.7.2. Set the rotary switch to the desired F range.

4.7.3. Before inserting capacitors into the capacitance test socket, be sure

that the capacitor has been fully discharged.

4.7.4. You can see the reading on the LCD.

4.7.5. When frequent capacitor testing is required, put the capacitor test unit

plug (spare parts) into COM and V/Ω and put the capacitor leads into

the two long sockets of the capacitor test unit, and capacitor testing is

ready.

WARNING

To avoid electric shock, remove the test leads from the circuit under

test before measuring the capacitance of a capacitor.

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Velleman DVM990BL Operations Instructions Page 11