Description:
The BM 802A is a digital AC clamp meter manufactured by Sinometer. Electricians and technicians use it as an essential tool because it allows them to measure electrical current in a conductor without direct contact.
Key features:
- Measurement functions: In addition to measuring AC current up to 1000A with the clamp jaw, the BM 802A can also test AC/DC voltage, resistance, capacitance, frequency, and diodes using the included test leads.
- Auto/Manual range: This feature allows users to select a measurement range manually or let the meter do it automatically, improving efficiency.
- Display: It has a 3 3/4 digit LCD with a maximum reading of 3999.
- Non-Contact Voltage (NCV): An NCV function can detect live voltage without direct contact, enhancing safety.
- Data hold: This feature freezes the current reading on the display for easier viewing.
- Auto power-off: The meter automatically shuts down after a period of inactivity to save battery life.
- Zero adjustment: This feature is primarily used for DC current measurements to negate residual magnetic fields for more accurate readings.
How to use a clamp meter for AC current measurement:
- Select the function: Turn the rotary dial to the “AC Current (A~)” setting. Ensure the test leads are unplugged when measuring current via the clamp.
- Open the jaw: Press the trigger to open the clamp jaw.
- Clamp a single wire: Place the jaws around a single insulated conductor, not the entire power cord, as the currents would cancel each other out. For the most accurate reading, center the wire within the jaws, usually indicated by alignment marks.
- Take the reading: The current will be displayed on the LCD screen. You can use the “Data Hold” button to freeze the reading if needed.
Safety precautions:
When you use a clamp meter, always wear appropriate personal protective equipment (PPE), such as insulated gloves. Place the red lead in the V input jack and the black lead in the COM jack before measuring voltage or resistance. Regularly inspect your test leads for damage, and replace them if you notice wear. Also, turn off power to a circuit before you test anything other than current.v
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