Amprobe AM-540, User Manual

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3. Measuring Frequency by using AC Current function
Step 1: Turn the rotary switch to μA or mA or 10A position.
Step 2: Connect the test leads to the correct input 10A/mA μA current
terminal and to the circuit before powering the circuit under test
(connecting diagram refer to “Measuring AC Current”).
Primary display shows AC Current measurement reading.
Secondary display shows frequency measurement reading.
Measuring AC and DC Current
Press SELECT button to select AC or DC current measurement function.
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To avoid personal injury or damage to the Meter:
1. Do not attempt to make an in-circuit current measurement when the
open-circuit potential to earth ground exceeding 1000V
2. Switch to proper function and range for your measurement.
3. Do not place the test probe in parallel with a circuit when the test leads
are connected to the current terminals.
4. Connect the test leads to the correct input 10A/mA μA current terminal
and to the circuit before powering the circuit under test.
5. For current range from 8-10A, do not measure current for more than 20
minutes. Wait for 10 minutes before taking another measurement
6. After measurement, switching OFF the circuit’s power before removing
test leads from the circuit.