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User's Guide
True RMS AC/DC Mini Clamp Meter
Model 380947
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Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website at www.extech.com for contact information. A Return Authorization (RA) num
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Specifications General Specifications Display 3-3/4 Digit LCD with 40 segment bargraph Functions Current (ACA, DCA) and Frequency (Hz) Polarity “-“ indicates negative polarity (positive polarity assumed) Current sensor Hall effect Overload Display indicates “1___” or “-1___” DCA zero adjust One-touch zero key (also used as a Relative function) Display rate 2 readings/second (20 readings/second for bargraph) Battery Two 1.5V AA batteries 0 0 0 0 Operating temperature 4 F to 122 F (-10 C
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Meter Description 1. Conductor under test 2. Clamp Jaws 3. Jaw trigger – Opens the meter jaws 4. ZERO / Relative button – Zeroes the DCA reading 5. Function select switch 6. HOLD button to freeze displayed reading 7. MAX/MIN button – Press to track and view highest and lowest readings 8. LCD Display with function indicators, units of measure, and bargraph 380947 V3.0V 10/06 4
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Display icons Low battery DC Direct current AC Alternating current Minus sign AUTO Automatic range (frequency only) MAN Manual range ZERO Zero function HOLD HOLD function MAX Highest reading MIN Lowest reading A Current unit of measure M Prefix MEGA (millions of units) k Prefix KILO (thousands of units) Hz Hertz (unit of measure for frequency) Bargraph display The 40 segment bargraph display shown below is a graphical interpretation of the measurement. It is dis
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Operation AC Current Measurements WARNING: To avoid electric shock, disconnect the test leads from the meter before making current measurements. 1. Set the Function switch to the 4, 40, 100, or 400A AC range. 2. Press the Trigger to open the clamp jaw. 3. Clamp onto a single conductor (fully enclosing it). Do not allow a gap between the two halves of the jaw. 4. Read the ACA value on the LCD. DC Current Measurements WARNING: To avoid electric shock, disconnect the test leads from the m
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Battery Replacement 1. When the low battery symbol appears on the LCD, the batteries must be replaced. 2. Turn the meter off and remove the rear battery compartment screw. 3. Lift off the battery compartment cover and replace the two 1.5V AA cells. 4. Replace the compartment cover and secure the screw. Cleaning Use only a dry cloth to clean the plastic case. Calibration and Repair Services Extech offers repair and calibration services for the products we sell. Extech also provides
