EXTECH MA445 [12/21] Continuity measurements

MA44x‐en‐GB_V1.0 8/16

ContinuityMeasurements

WARNING:Please remove power to the circuit under test and discharge all capacitors

before taking resistance or continuity measurements. The meter will display OL if the circuit

under test is an open circuit of if the measurement exceeds the maximum range of the meter.

Do not input a voltage >30V AC or DC.

1. Turn the function switch to the Continuity

position.

2. Use the M (mode) button to select the continuity display

icon.

3. Insert the black lead banana plug into the negative (COM) jack. Insert the red test lead

banana plug into the positive (Ω) jack. See Fig. 7 above.

4. Touch the test probe tips across the circuit or wire.

5. If the resistance is < 30Ω, the meter will beep. If the resistance is > 60Ω, the meter will

not beep. If the resistance is between 30 and 60Ω, the meter will stop beeping at an

unspecified point.

FrequencyMeasurements

WARNING:Do not input voltages > 30Vrms when measuring frequency.

Turn the function switch to the Hz% position.

1. Insert the black lead banana plug into the

negative (COM) jack. Insert the red test lead

banana plug into the positive jack. See Fig. 8.

2. Touch the test probe tips across the circuit or

component.

3. Read the Frequency measurement on the

meter display.

4. For the MA443 and MA445, use the M

(mode) button to view DutyCycle%. For the

MA440 use the Hz% button to view Duty

Cycle%.



Fig.8 – Frequency Measurements



Hz %

AUTO