Care should be taken to ensure that the meter does not pick up stray magnetic fields. Ensure that the jaws are completely closed before taking readings.

Open the jaws by pressing against the trigger.If there is more than one current position or if the circuit current is unknown, select a setting greater than the highest possible circuit current. Set the function switch to the proper current set- ting (600 A, 200 A, 10 A, 400 mA, etc.).If the ammeter includes fused current terminals, check to ensure that the ammeter fuses are good. If the ammeter range is not high enough, select an accessory that has a high enough current rating, or select an ammeter with a higher range. Determine if the ammeter range is high enough to measure the maximum current that may exist in the test circuit.If both AC and DC measurements are required, select an ammeter that can measure both AC and DC. Select the ammeter required to measure the circuit current (AC or DC).

Determine if AC or DC current is to be measured.

To measure current using a clamp-on ammeter, the following procedure is applied: A clamp-on ammeter measures the current on a circuit by measuring the strength of the magnetic field around a single conductor. Clamp-On Ammeter Current Measurement.ĪC or DC measurements using a clamp-on ammeter or a digital multimeter (DMM) with a clamp-on current probe accessory follow standard procedures. If stray magnetic fields are possibly affecting a measurement, several measurements at different locations along the same conductor must be taken. A clamp-on ammeter includes test leads and voltage and resistance modes.Įlectricians must ensure that clamp-on ammeters do not pick up stray magnetic fields by separating conductors being tested as much as possible from other conductors during testing. To measure voltage and resistance, the clamp-on ammeter must include test leads and voltage and resistance modes. Most clamp-on ammeters can also measure voltage and resistance. A clamp-on ammeter is normally used to measure current in a circuit with over 1 A of current and in applications in which current can be measured by easily placing the jaws of the ammeter around one of the conductors.

Dc inductive amp clamp