USER GUIDE 400Amp AC Clamp Meter + NCV Model MA430
Introduction Congratulations on your purchase of this Extech MA430 Clamp Meter. This meter measures AC Current, AC/DC Voltage, Resistance, Diode Test, Continuity and Non-Contact Voltage detection. The double molded case is designed for heavy duty use. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version of this User Guide, Product Updates, and Customer Support.
SAFETY NOTES Do not exceed the maximum allowable input range of any function. Do not apply voltage to meter when resistance function is selected. Set the function switch OFF when the meter is not in use. Remove the battery if meter is to be stored for longer than 60 days. WARNINGS Set function switch to the appropriate position before measuring. When measuring volts do not switch to current/resistance modes. Do not measure current on a circuit whose voltage exceeds 600V.
Description Meter Description 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.
Operation NOTES: Read and understand all Warning and Caution statements in this operation manual prior to using this meter. Set the function select switch to the OFF position when the meter is not in use. Non-Contact Voltage Detector WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a known live circuit to verify proper operation. 1. Rotate the Function switch to any position. 2. Place the detector probe tip on the conductor to be tested. 3.
AC/DC Voltage Measurements CAUTION: Do not measure voltages if a motor on the circuit is being switched ON or OFF. Large voltage surges may occur that can damage the meter. 1. Rotate the function switch to the VAC or the VDC position. 2. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive V jack. Touch the black test probe tip to the negative side of the circuit. Touch the red test probe tip to the positive side of the circuit.
Data Hold To freeze the LCD reading, press the HOLD button. The HOLD icon appears on the LCD. Press the HOLD button again to return to normal operation. MAX Press the MAX button to display and hold the maximum reading. The display will update if a higher reading is detected. Press the MAX button to exit the mode. RANGE (Voltage and Resistance functions) When the meter is first turned on, it automatically goes into Auto-Ranging.
Maintenance WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input terminals, and turn OFF the meter before opening the case. Do not operate the meter with an open case. Cleaning and Storage Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents. If the meter is not to be used for 60 days or more, remove the battery and store it separately. Battery Replacement 1.
Specifications Accuracy (% of reading + digits) ±(2.5% + 10 digits) Function Range Resolution AC Current 2.00 A 0.001A 20.00 A 0.01A ±(2.5% + 4 digits) 200.0 A 0.1A ±(2.5% + 4 digits) 50/60Hz 400 A AC Voltage 50 to 60Hz 1A ±(3.0% + 4 digits) 200.0mV 0.1mV ±(1.5% + 30 digits) 2.000 V 0.001V 20.00 V 0.01V 200.0 V 0.1V 600 V DC Voltage 1V ±(2.5% + 8 digits) 200.0 mV 0.1mV ±(0.8% + 2 digits) 2.000 V 0.001V 20.00 V 0.01V 200.0 V 0.1V 600 V Resistance ±(1.
General Specifications Clamp jaw opening 30mm (1.18") approx. Display 2,000 count LCD Continuity check Threshold <150; Test current < 0.5mA Diode test Test current of 0.3mA typical; Open circuit voltage 1.
