Velleman EVM892 Uživatelský manuál stáhnout pdf (Strana 11)

EVM892

29.04.2010 ©Velleman nv

Notes:

• Never perform continuity or diode measurements on a live circuit and make

sure all capacitors are completely discharged.

• Measuring diodes that are part of a circuit might produce faulty results.

Consider disconnecting them from the circuit.

Measuring capacitance

Do not perform capacitance measurements on live circuits. Use the

included adaptor socket.

• Connect the black test lead to the "COM" jack and the red test lead to the

"mA/TEMP/CAP/hFE" jack.

• Connect the test probes to the included adaptor socket respecting the polarity.

• Select the appropriate "CAP" range with the FUNCTION switch. When the range

is unknown, always select the highest possible range and lower to the

appropriate range.

• Place the capacitor under test in the adaptor socket, respecting the polarity in

case of a polarised capacitor (the “+” of the capacitor must be inserted in the Lx

jack, the “-” with the Cx jack).

• The measured value appears on the display.

Notes:

• Never perform capacitance measurements on a live circuit and make sure all

capacitors are completely discharged.

• Should the measured capacitance exceed the selected range the display will

show “1”.

Transistor test (hFE)

Do not perform transistor measurements on live circuits. Use the

included adaptor socket.

• Connect the black test lead to the "COM" jack and the red test lead (+) to the

"mA/TEMP/CAP/hFE" jack.

• Connect the test probes to the included adaptor socket respecting the polarity.

• Select the hFE-range with the FUNCTION switch.

• Determine whether the transistor is of the NPN- or PNP-type and locate the

emitter, the base and the collector. Insert the leads into the proper holes in the

included adaptor socket.

• The display will show the approximate hFE-value (current gain). Base current

10µA, Vce 2.8V.

Measuring temperature

Do not touch any live parts with the temperature measuring

probe. Use the included adaptor socket.

• Connect the black test lead to the "COM" jack and the red test lead to the

"mA/TEMP/CAP/hFE" jack.

• Connect the test probes to the included adaptor socket respecting the polarity.

• Select the TEMP-range with the FUNCTION switch.

• Insert the plug of the K-thermocouple in the adaptor socket according to the

indicated polarity.

Note: push the temperature probe firmly into the socket.

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