Perel EVM890 Manual Del Usuario página 5

Resistance measurement
1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ω/f input connector.
2) Set the FUNCTION switch to the Ω range to be used and connect the test leads across the resistance under test.
Remarks:
1) For resistance above 1MΩ, the meter may take a few seconds to stabilize reading. This is normal for high
resistance measuring.
2) When the input is not connected, i.e. at open circuit, the figure " 1 . " will be displayed for the overrange condition.
3) When checking in-circuit resistance, be sure the circuit under test has all power removed and all capacitors are
fully discharged.
Capacitance measurements
1) Connect the test capacitor to the input sockets (not test leads). Pay attention at the polarity connections when
required and set the FUNCTION switch to CX range.
Remarks:
1) Do not connect an external voltage or a charged capacitor to the measuring terminals. Capacitors should be
discharged before connected into the test jacks.
2) When testing individual capacitors, insert the leads of the capacitor into the two sockets, with "+" (upper socket),
"-"(lower socket), at the left of the panel.
3) When testing polarized capacitors, for example, a tantalum type, particular attention must be paid to the polarity
connections. This is to prevent possible damage to the capacitor.
4) Units: 1pF = 10 µ F 1nF = 10 µ F.
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Diode measurement and Continuity test
1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ω/f input connector.
2) Set the FUNCTION switch to the / range and connect the test leads across the diode under measurement,
display shows the approx. forward voltage of this diode.
3) With continuity tests, connect the test leads to two points of the circuit. If the resistance is lower than approx. 30Ω
a buzzer sounds.
Transistor hFE test
1) Set the FUNCTION switch to the hFE range.
2) Determine whether the transistor is NPN or PNP and locate the Emitter, Base and collector leads. Insert the leads
into the proper holes in the socket on the front panel.
3) The display will read the approximate hFE value at the test condition. Base current 10 µ A, Vce 2.8V.
Temperature measurement
1) Measure temperature with K type thermocouple: Set the FUNCTION switch to the T range and insert the K type
thermocouple plug into K PROBE socket.
2) Measure ambient temperature without probe: On the same T range, display reading is the ambient temperature in
°C.
To install the temperature probe, do not hesitate to push it firmly till the bottom of the socket.
EVM890_v2
5 PEREL