Checking Continuity; Checking Diodes - Radio Shack 22-812 Owner's Manual

"Using Relative Measurement"
on Page 17).
• The accuracy of capacitance
measurement depends on the
measurement method and also
differs with different types of
capacitors. The meter's mea-
surement is for reference only.

CHECKING CONTINUITY

Caution: Do not connect the test
leads to a source of voltage with the
„ „ „ „
– – – –
selector set to . This could dam-
/
age the meter or circuit being tested.
You can use the meter to check for
shorted or open electrical circuits.
1. Remove all power from the cir-
cuit under test and discharge all
capacitors.
2. Rotate the function selector to
„ „ „ „
.
3. To select the continuity function,
–ý –ý –ý –ý
press until
SELECT
the top of the display.
4. Touch the test leads across the
circuit you want to measure.
appears and the buzzer sounds if
the circuit resistance is less than
about 50 ohms (meaning the cir-
cuit is continuous or shorted).
appears and the meter's
Open
buzzer does not sound if the cir-
cuit resistance is greater than
about 50 ohms (meaning the cir-
cuit is not continuous).

CHECKING DIODES

This procedure lets you check diodes,
transistors, and other semiconductors
for opens, shorts, and normal opera-
tion. It also lets you determine the for-
ward voltage and polarity for diodes.
(This is handy when you need to
match a diode.) You can also check
LEDs using this procedure.
Caution:
leads to a source of voltage with the
function selector set to
could damage the meter or the circuit
being tested.
Note: You can use the meter's h FE
feature to quickly measure the gain of
small-signal, bipolar transistors. See
"Measuring h FE" on Page 29 for more
information.
1. Remove all power from the cir-
– – – –
/
cuit under test and discharge all
capacitors.
2. Rotate the function selector to
„ „ „ „
appears at
.
3. To select the diode function,
press
Shrt on the display.
4. Connect the test leads to the
device you want to check, or
remove one of the leads of the
component you want to measure
from its circuit and connect the
test leads to the component.
Note the first reading.
Making Measurements
Do not connect the test
„ „ „ „
– – – –
. This
/
– – – –
„ „ „ „
once. appears
SELECT
/
25