Extech Instruments 380940 User Manual Download | Manualshive

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User's Guide

True RMS AC / DC Power Clamp Meter

Model 380940

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Summary of Contents for 380940

Page 1: ...User s Guide True RMS AC DC Power Clamp Meter Model 380940 ...

Page 2: ...es 3 DO NOT measure voltage if the voltage on the COM input jack exceeds 500V above earth ground 4 NEVER connect the meter leads across a voltage source while the function switch is in the current mode Doing so can damage the meter 5 ALWAYS discharge filter capacitors in power supplies and disconnect the power when measuring 6 ALWAYS turn off the power and disconnect the test leads before opening ...

Page 3: ...RO button Zeroes the DCA reading 5 Positive input jack for red test lead 6 Function select dial 7 HOD button freezes the displayed reading 8 MAX MIN button Press to track and view highest and lowest readings 9 LCD Display with function indicators and bargraph 10 COM input jack for black test lead Function Select Switch ...

Page 4: ...Bargraph display The 40 segment bargraph display shown below is a graphical interpretation of the measurement It is displayed under the display digits on the LCD The bars in the bargraph indicate a presence of an electronic signal The more bars showing the higher the signal The digits below the graph help the user see how many bars are showing If 40 segments are showing the bars will reach the 40 ...

Page 5: ...ts WARNING To avoid electric shock disconnect the test leads from the meter before making current measurements 1 Set the Function switch to the AC Current position 2 Press the jaw trigger and clamp around a single conductor fully enclosing it Do not allow a gap between the two halves of the jaw 3 Read the ACA value on the LCD DC Current Measurements WARNING To avoid electric shock disconnect the t...

Page 6: ... the meter s input terminals 3 Connect the other ends of the test leads in parallel with the device circuit under test 4 Read the Frequency measurement on the LCD in Hz MIN MAX Function Pressing the MIN MAX key allows the meter to display ONLY the highest and the lowest readings encountered Press the MIN MAX key once to view the minimum reading press it again to view the maximum reading Note that ...

Page 7: ...tteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle Cleaning Use only a dry cloth to clean the plastic case Specifications General Specifications Display 3 3 4 digit 4000 count LCD with 40 segment bargraph Functions Watts ACA DCA ACV DCV Frequency Polarity indicates negative polarity positive assumed Curren...

Page 8: ...50V 40kW 10W 1 5 3dgts 250V 400A DC Power 240kW 100W 1 5 3dgts 250V 400A DC Current 400A 100mA 1 5 3dgts 600A DC 50 60Hz 40 to 100Hz AC Current True RMS Crest factor 4 400A 100mA 1 5 3dgts 2 5 4dgts 600A AC DC Voltage 400V 0 1V 1 0 2dgts 800V DC 50 60Hz 40 to 1kHz AC Voltage True RMS Crest factor 4 Input impedance 10M 600V 1V 1 5 2dgts 2 0 4d 800V AC Frequency 10Hz 10kHz 0 01 10Hz 0 8 2dgts Sensit...

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