Amprobe LCR55A Inductance-Capacitance-Resistance-Meter User Manual

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be tested in the same manner described above.
Note: The test procedure of microwave oven diodes is identical to regular diodes

except forward voltage drop will be higher (3 or more volts) than standard

silicon diodes. LEDs may also be tested with the LCR55A in the M.W. position.

Continuity Test

The Continuity test checks electrical continuity between two contact points.
1. Set the Function/Range switch to �.
2. Plug the black test lead into the –Rx jack and connect the test lead tip to one

of the contact points.

3. Plug the red test lead into the +Rx jack and connect its test lead point to the

other contact point. (See Figure 1 for connections).

4. The internal beeper emits a tone when resistance is less than approx. 30Ω.
Capacitance Mesurements (Fig. -3-)

1. Discharge all voltage from the capacitor (via a 20kΩ resistor) before

measuring its value.

2. Connect the red test lead to the HI(+) input and the black test lead to the

Lo(–) input.

3. Set the function/range switch to the capacitance range that gives the best

resolution.

4. Apply probe tips to the capacitor leads
5. Read the capacitance value on the display (you may have to wait a few

seconds until the capacitor is fully charged). If “OL” appears in the highest

range, the capacitor is too large to be measured.

Note: Small value capacitors can also be measured by inserting their leads

directly into the Cx/Lx slots in the meter.
Note:The capacitance range is protected by a 0.1A/250V fast blow fuse. If fuse

blows, replace with same (see Battery and Fuse Replacement).
Note: The LCR55A has a residual capacitance of approximately 6pF in the 200nF

range. When using the 200nF range, note the residual capacitance and subtract

this value from the measured value.

Inductance Measurement

1. Connect the red test lead to the HI(+) input and the black test lead to the

Lo(–) input.

2. Set the function/range switch to the inductance range that gives the best

resolution.

3. Apply probe tips to the inductor leads.
4. Read the inductance value on the display. If “OL” appears in the highest

range, the inductor is too large to be measured.

Note: Small value inductors can also be measured by inserting their leads directly

into the Cx/Lx slots in the meter.
Note: The inductance range is protected by a 0.1A/250V fast blow ceramic fuse. If

fuse blows, replace with same (see Battery and Fuse Replacement).

Transistor Gain Measurement

The Transistor must be out of circuit.