User's Guide True RMS AC / DC Power Clamp Meter Model 380940
Contents
1. 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 mark if 20 bars are showing the bars will reach the 20 mark The bargraph is to be interpreted based on the range the meter is in while the measurement is being made If the bargraph shows 40 segments lit then the signal is at the highest end of the meter s present range PTT TTT TTT 0 10 20 im 30 380940 EU EN V4 1 4 12 Operation AC DC Power Watt Measurements Connect the test leads to the voltage source in parallel with the load refer to diagram Clamp onto one of the wires connected to the load 3 Select the AC or DC voltage range using the function select switch and check the voltage reading 4 Select the AC or DC current range using the function select switch and check the current reading 5 Select the appropriate Watt range using the function select switch Read the KW value on the LCD Voltage Power Source 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 AC Current position 2 Press the jaw trigger and clamp around a single conductor f2. Relative mode is not available if MIN MAX mode is enabled 6 380940 EU EN VA 1 4 12 Auto Power OFF To extend battery life the meter will auto power off after 30 minutes of operation To resume operation either turn the meter OFF and then ON again or press the HOLD button 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 You as the end user are legally bound Battery ordinance to return all used batteries and accumulators disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at the mme end of its lifecycle Cleaning Use only a dry cloth to clean the plastic case Specifications General Specifications Display Functions Polarity Current sensor Overload indication DCA zero adjust Display rate Auto Power Off Battery Operating temp Operating Humidity Power consumption Weight Dimensions Jaw opening Standards 3 3 4 digit 4000 count LCD with 40 segment bargraph Watts ACA DCA ACV DCV Frequency indicates negative polarity posi
3. User s Guide EXT INSTRUMENTS A FLIR COMPANY True RMS AC DC Power Clamp Meter Model 380940 True RMS AC DC Power Clamp Meter acy DCV ACA DCA ZERO 40kW eS ES ZEROA HOLD MAX MIN j V MAXMIN c _ L1 LI LI V C A MAN LLL LM LI vkouz m HOLD 20 30 40 0 10 EXTECH 380940 Introduction Congratulations on your purchase of the Extech 380940 True RMS Watt Clamp DMM This meter combines multimeter and clamp meter functionality in one convenient meter Careful use of this meter will provide years of reliable service Safety 1 NEVER exceed the specified voltage current maximum 2 USE EXTREME CAUTION when working with high voltages 3 DONOT 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 the back to replace the fuse or batteries 7 NEVER operate the meter unless the back cover and the battery fuse door are in place and fastened securely International Safety Symbols DC Voltage Refer to explanation in DC Current owners manual AC Voltage Dangerous voltage risk AC Current f electrical shock Do
4. ments are made in parallel with the device or circuit under test 4 Read the DCV value on the LCD Frequency Measurements 1 Setthe Function switch to the Hz position 2 Insert the test leads into 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 the meter will only change its displayed reading when a measurement is taken higher than the previous MAX or lower than the previous MIN readings The HOLD display icon along with the MIN or MAX icon will appear on the LCD in MIN MAX mode Pressing the MIN MAX key a 3 time returns the meter to normal operation Data Hold To freeze the current reading on the LCD press the Data Hold key To release the Data Hold function and return the meter to normal operation press the Data Hold key again Relative Mode 1 Press the Zero key and the present measurement will Zero 2 All subsequent measurements are displayed with respect to the zeroed reading For example if a 20A reading is zeroed and a 30A reading is subsequently measured the LCD will display 10A 3 Toreturn to normal operation press and hold the zero key for 2 seconds 4 Note that
5. tive assumed Hall effect sensor type Left blinking digit One touch zero key 2 readings second 20 readings second for bargraph Meter turns off automatically after 30 minutes Two 1 5V AA batteries 10 C to 50 C 4 F to 122 F 85 RH Approximately 10mA DC 190g 6 7 oz including battery 183 x 63 6 x 35 6mm 7 2 x 2 5 x 1 4 HWD 23mm 0 9 maximum conductor size IEC 1010 Category III 300V Category II 600V 7 380940 EU EN VA 1 4 12 Range Specifications Function _ Resolution Accuracy Overload protect 4OKW S 1 5 3dgts 250V 400A Note SO 6OHZ PF 0 6 to 1 Vpeak lt lt ON n 5 3dgts 250V 400A Note 40Hz to 100Hz PF 0 6 to 1 peak lt lt lt 360V l B 100 2 5 3dgts 600V 400A Note 40Hz to 100Hz PF 0 6 to 4 Vpeak lt 850V NE DC Power DC Current 1 5 3dgts 600A DC AC Current 50 60Hz 40 to 100Hz True RMS Crest factor anna AC Voltage True RMS Crest factor 1 5 2dgts 2 0 4d 800V AC lt 4 Input impedance 10M Frequency 10Hz 10kHz 0 01 10Hz 0 8 2dgts Sensitivity 10V 600VAC Copyright O 2012 Extech Instruments Corporation a FLIR company All rights reserved including the right of reproduction in whole or in part in any form www extech com 8 380940 EU EN VA 1 4 12
6. uble Insulation 2 380940 EU EN VA 1 4 12 Meter Description 1 Conductor under test Clamp Jaws Jaw trigger Opens the meter jaws ZERO button Zeroes the DCA reading Positive input jack for red test lead Function select dial HOD button freezes the displayed reading MAX MIN button Press to track and view highest and lowest readings of a p 19b m oe me LCD Display with function indicators and bargraph COM input jack for black test lead e 3 4 True RMS AC DC Power Clamp Meter p ee JC LILILILI MAN LLL LI LI MkoHz ed LEE EXTECH 380940 A MAX 600V 6 8 7 9 10 Function Select Switch AC Current DC Current DC Voltage Power Watt AC Voltage S Ranges v Frequency z aal Power OFF OFF gt 240kW 3 380940 EU EN V4 1 4 12 Display icons DC Low battery Direct current AC Alternating current Minus sign AUTO Automatic range frequency only MAN Manual range ZERO Zero Relative function HOLD HOLD function MAX Highest reading MIN Lowest reading 4 Audible continuity V Voltage unit of measure A Current unit of measure M Prefix MEGA millions of units k Prefix KILO thousands of units Q Ohm unit of measure for resistance and continuity Hz Hertz unit of measure for frequency Bargraph display The 40 segment bargraph display shown below is a graphical interpretation of the measurement
7. ully 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 test leads from the meter before making current measurements Set the Function switch to the DC Current position 2 Press the DCA zero key to null the meter display 3 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 4 Read the DCA value on the LCD 9 380940 EU EN V4 1 4 12 AC Voltage Measurements WARNING To avoid electric shock or damage to the meter do not make any voltage measurements that exceed the maximum specified Set the Function switch to the AC Voltage position 2 Insert the test leads to the meter as follows Red lead to V O Hz terminal Black lead to the COM input 3 Measure voltage with the pointed end of the test leads Remember that voltage measurements are made in parallel with the device circuit under test 4 Read the ACV value on the LCD DC Voltage Measurements WARNING To avoid electric shock or damage to the meter do not make any voltage measurements that exceed the maximum specified Set the Function switch to the DC Voltage position 2 Insert the test leads to the meter as follows Red lead to V Q Hz terminal Black lead to the COM input 3 With the pointed end of the test leads measure voltage Remember that voltage measure
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