Velleman EVM892 - Manual (Page 11)

EVM892
29.04.2010 ©Velleman nv 11
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.