Ryobi RP4020 - Manual (Page 12)

12 – English
CONTINUITY TEST
See Figure 10, page 15.
NOTE: Before continuity test, disconnect all power to the
circuit to be tested, and discharge all capacitors fully.

Connect the black test lead to the COM jack and the red
test lead to the μA/mA jack.
NOTE: The polarity of the red lead is positive ( + ).
 Set the mode selection dial to position.
 Connect the test leads across the circuit to be tested.
 If the circuit resistance is less than about 20
Ω
, the built-
in buzzer will sound.
DIODE TEST
See Figure 11, page 15.
NOTE: Before diode test, disconnect all power to the circuit
to be tested, and discharge all capacitors fully.

Connect the black test lead to the COM jack and the red
test lead to the
μA/mA
jack.
NOTE: The polarity of the red lead is positive ( + )
.
 Set the mode selection dial to position.
 Connect the red test lead to the anode of the diode to
be tested, and the black test lead to the cathode of the
diode .
 Read the approximate forward voltage drop of the diode
on the display.
 If the connection is reversed, OL will be shown on the
display.
OPERATION
MEASURING CAPACITANCE
See Figure 12, page 15.
NOTE: Before measurement, make sure that the capacitor
to be measured has been discharged fully.

Connect the black test lead to the COM jack and the red
test lead to the μA/mA jack.
 Set the mode selection dial to position.
 If the display shows a reading other than zero, press the
REL▵ button.
NOTE: In low capacitance range, if the reading is not
stable, wait a while to let the reading stabilize, and then
press the
REL▵ button.
 Connect the test leads across the capacitor to be mea-
sured.
 Wait until the reading is stable, then take the reading. For
high capacitance measurements, it may take about 30
seconds for reading to be stable.
AUTOMATIC POWER OFF
 The display will go blank and the meter will go into Sleep
mode if you do not turn the mode selection dial or press
any button for about 15 minutes. Pressing any button
arouses the meter from Sleep.
To disable the automatic power-off feature, press and hold
down any button while rotating the mode selection dial from
OFF position.