User Manual Model 380943
Contents
1. COM input jack exceeds 600V above earth ground 4 ALWAYS turn off the power and disconnect the test leads before opening the meter to replace the fuse or the batteries 5 NEVER operate the meter unless the back cover and the battery fuse door are in place and fastened securely Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Operation Using the Frequency Selector Switch 50 60Hz position low pass filter Use the 50 60HZz position when measuring circuits with a frequency bandwidth of 50 60Hz Since the meter has superior frequency response measurement results may include higher frequencies and harmonics of the fundamental frequency Putting this switch in the 50 60 position activates the meter s low pass filter minimizing the affects of high frequency noise The filter s cut off frequency is 100Hz with 24dB octave attenuation approx WIDE Position for high frequencies Put the slide switch in the WIDE position if the circuit under test is a high frequency generating device up to 1KHz such as an inverter switching regulator etc To verify the presence of a high frequency signal take measurements in both switch positions If the readings are widely different then a high frequency signal can be assumed present AC Current Measurements Basic Current Measurement Procedure WARNING To avoid electric shock disconnect the test leads from the meter be2. Test Equipment 99 Washington Street Depot Melrose MA 02176 Fax 781 665 0780 1 800 517 8431 TestEquipmentDepot com EXTECH INSTRUMENTS Model 380943 High Resolution 60 Amp AC Clamp on Meter MAX 600V 4000 Count Display with 10uA Resolution 20 reading per second bargraph Shielded transformer jaws Selectable filter circuit MAX MIN Relative amp Hold functions 1 2 30mm jaw diameter Introduction Thank you for selecting the Extech 380943 AC Clamp Meter This device is ideal for checking leakage ground and sheath current This professional meter with proper care will provide years of safe reliable service Specifications General Specifications Display 3 3 4 digit 4000 count LCD with 40 segment bargraph ACA ACV Resistance and Continuity Polarity Minus sign indicates negative polarity Overload indication Left blinking digit Relative Mode ZERO front panel key Display rate 2 readings per second 20 readings per second for bargraph Battery Two 1 5V AA batteries Operating conditions 4 F to 122 F 10 C to 50 C lt 85 Relative Humidity Storage conditions 4 F to 140 F 20 C to 60 C lt 75 Relative Humidity Altitude Operate at less than 2000 meters Indoor use only Power consumption Approximately 10mA DC 7 oz 200g including battery 8 3 x 2 4 x 1 4 210 x 62 x 35 6mm HWD Jaw opening 1 2 30mm Standards IEC 1010 Category III 300V Cate
3. fore making current measurements Set the Function switch to the desired current range 2 Set the Frequency slide switch to the appropriate position refer to the paragraph above to determine which position to use 3 Press the jaw trigger to open the clamp jaws and clamp around the conductor s ensuring they re fully enclosed by the clamp jaws Refer to the applications diagrams below for specific measurement configurations Read the ACA value on the LCD digits and the bargraph AC Current Applications Load Current Measurments 4 Model 380943 Ver 2 1 11 2002 Leakage Current on Unbalanced Loads Ground Conductor Leakage Single Phase 2 Wire Leakage Three Phase 3 Wire Leakage Three Phase 4 Wire Leakage AC Voltage Measurements Set the Function switch to the Voltage position 2 Set the Frequency Slide Switch to the appropriate position refer to the section Using the Frequency Slide Switch earlier in this manual 3 Insert the test leads to the meter as follows Red lead to the red V input terminal Black lead to the black COM input terminal Connect the test leads to the circuit or device under test see diagram example below 5 Read the ACV value on the meter s display LCD digits and bargraph Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com
4. gory II 600V Range Specifications Range Resolution Accuracy Accuracy Overload mea oe seine AC Current oO 0 60 0A 0 to 50A 1 5 3 digits 3 0 5 digits 60 0A 50 to 60A 3 0 5 digits 3 5 5 digits AC Voltage 400 0V 1 5 2 digits 2 0 4 digits 800V AC Resistance and Continuity Range Accuracy Audible Overload Continuity Protection 40 0 to 400 0Q 1 5 2d Beeps lt 38Q 600V AC Specification Notes e Open Circuit Voltage 0 4V e AC Voltage Input Impedance 10MQ e Accuracy specified at 25 C Displays over 60A are possible but the accuracy of such measurements is not specified 2 Model 380943 Ver 2 1 11 2002 Meter Description 1 Current sensing jaws 6 ZERO Relative key 2 Jaws opening trigger 7 LCD Display 3 Function switch 8 Frequency select slide switch 4 Data HOLD key 9 Positive input terminal for V and Q 5 MAX MIN key 10 Negative COM input terminal Safety Information AN Caution Refer to the explanation in this Manual AN Caution Risk of electric shock Earth Ground l E Double Insulation This meter has been designed with safety in mind but the operator must use caution The rules listed below should be carefully followed for safe operation NEVER apply voltage or current to the meter that exceeds the specified maximum USE EXTREME CAUTION when working with high voltages 3 DO NOT measure voltage if the voltage on the
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