Amprobe ac68C Manuale d'uso - Pagina 9

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Resistance Measurement

Before taking any in-circuit resistance measurement, remove

power from the circuit being tested and discharge all

capacitors.

Set the function/range selector to the 4 kΩ position.

Connect the black lead to the COM terminal and red lead to

the "VΩ" terminal.

Connect the test leads to the resistance or circuit to be

measured and read the value on the display.

Before taking any in-circuit continuity measurement, remove

power from the circuit being tested and discharge all

capacitors.

Set the function/range selector to the R position.

Connect the black lead to the COM terminal and red lead to

the "VΩ" terminal.

Connect the test leads to the circuit to be tested.

Continuity (resistance ≤40 Ω) is indicated by a continuous

beep tone.

Set the function/range selector to the G position.

Connect the black lead to the COM terminal and red lead to

the "VΩ" terminal.

Connect the red test lead to the anode, and the black test

lead to the cathode of the diode to be tested.

Read the forward voltage value on the display (approx.

0.6 V for a silicon diode or 0.4 V for a germanium diode).

An open diode is indicated by "OL".

Reverse test lead connections to the diode to perform a

reverse bias test. "OL" indicates a good diode.

Notes: "OL" for both reverse and forward bias tests indicates an

open diode. A low voltage reading for both bias tests indicates a

shorted diode. If the diode is shunted by a resistor of 1000 ohms

or less, it must be removed from the circuit before taking the

measurement. Bipolar transistor junctions may be tested in the

same manner described above as emitter-base and base-

collector junctions are diode junctions.

Peak Hold Measurement

Proceed as for voltage or current measurement (AC or DC).

Before actually taking the measurement, press the PEAK button.

"PEAK" is shown on the display. After taking a measurement, the

displayed reading is the maximum peak value of a surge in the

voltage or current.

Warning