Measuring Resistance - Radio Shack 22-812A Manual

1. Rotate the function dial to
for 40/400mA and 4/10A ranges, and press SELECT to measure AC current (~
appears) or DC current (~ disappears).
2. power off the circuit under test and discharge all capacitors.
3. plug the black test lead into
jack. Connect the meter's test leads in series with the circuit.
4. Apply power and read the current �alue. if the measurement is less than
400mA and the red test lead is connected to +10A MAX, power off the
circuit.
if your measurement e�ceeds the selected range, OF appears until the
measured current is reduced to the selected range.
6-26-07
5. Mo�e the red test lead to + V.mA.Ω.
6. Rotate the function dial to
measured in Step 4.
7. Reapply power to the circuit.
if you are measuring DC current and the current's polarity is negati�e, - appears
before the �alue.

Measuring Resistance

1. power off the circuit under test and discharge all capacitors.
2. Rotate the function dial to
or MΩ (megohm) appears.
3 Touch tht e test leads across the resistor, or remo�e one of the leads of the
component from its circuit and touch the test leads across the resistor.
Notes:
• With no resistance connected across the test leads (meaning resistance is infinite),
appears when you measure resistance. This is normal.
• if you are measuring resistance of about 1M
seconds to stabilize. This is normal.
• To calculate and measure a �ery small resistance, touch the test leads together
to measure the meter's internal resistance, and then substract this �alue from the
measurement. Refer also to "Taking Relative Measurements" on page 11.
/µA/A for 0.4/4mA and 4/10A ranges or
(~ disappears). .
and the red test lead into the appropriate
-COM
/µA/A or /mA/A depending on the �alue you
/ and press SELECT until
Ω
1
Taking Measurements
(ohm), K (kilohm),
or more, the display might take a few
/mA/A
OF