User`s Manual - Reliability Direct, Inc.
Contents
1. 1 NEVER exceed the specified voltage current maximum when measuring 2 USE EXTREME CAUTION when working with high voltages 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 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 3 Ver 2 0 12 02 5 1 AC DC Power Watt Measurements 1 Connect the test leads to the voltage source in parallel with the load Clamp on one of the wires to the load Select AC or DC voltage range and check the voltage reading Select the AC or DC current range and check the current reading Select the appropriate Watt range Read the KW value shown on the LCD 2 3 xe wa 4 xo 5 6 xe wo 5 2 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 400A AC range 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 o2. EXTECH INSTRUCTION MANUAL _ INSTRUMENTS Model 380940 DC AC True RMS Watt Clamp DMM ff I DC AC RMS WATT CLAMP METER A j ANA gpega kinari eiai OFFLY 400 ff 7 MAX MIN a A CD MAN t Hz Aa 5 if 40 Q 380940 e 10W or 100mA resolution e Large 3 3 4 digit LCD display with 40 segment bargraph e Frequency Measurements e One touch DCA zero adjust e MIN MAX and Data Hold functions e 0 9 23mm Jaw diameter 1 INTRODUCTION Congratulations on your purchase of Extech s Watt Clamp Meter This professional meter with proper care will provide years of safe reliable service 2 SPECIFICATIONS 2 1 General Specifications Display 3 3 4 4000 count Digit LCD with 40 segment bargraph Functions Watts ACA DCA ACV DCV Frequency Polarity indicates negative polarity Current sensor Hall effect sensor type Overload indication Left blinking digit DCA zero adjust One touch zero key Display rate 2 readings second 20 readings second for bargraph Auto Power Off 30 minutes after power ON Battery Two 1 5V AA batteries Operating temp 4 F to 122 F 10 C to 50 C Operating Humidity lt 85 RH Power consumption Approximately 10mA DC Weight 6 7 oz 190g including batt
3. er to normal operation 6 4 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 5 380940 Ver 1 3 8 99 7 MAINTENANCE 7 1 Battery Replacement 1 When the low battery symbol appears on the LCD the batteries must be replaced 2 Power down and remove the rear battery compartment screw 3 Lift off the battery compartment cover and replace the two 1 5V AA cells 4 Replace compartment cover and secure the screw 7 2 Cleaning Caution Use only a dry cloth to clean the plastic case 8 CALIBRATION REPAIR SERVICES Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to insure calibration integrity 9 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 for authorization A Return Authorization RA number must be issued before any product is returned t
4. ery Dimensions 7 2 x 2 5 x 1 4 183 x 63 6 x 35 6mm HWD Jaw opening 0 9 23mm Standards IEC 1010 Category III 300V Category II 600V 2 2 Range Specifications Function Range Resolution Accuracy Overload protect AC Power 40kW 10W 1 5 3dgts See note Note 50 60Hz 0 250V 0 400A PF 0 1 Vpeak lt 360V 240kW 100W 1 5 3dgts See note Note 50 60Hz 0 600V 0 400A PF 0 1 Vpeak lt 850V 40kW 10W 2 5 3dgts See note Note 40Hz 1KHz 0 250V 0 400A PF 0 1 Vpeak lt 360V 240kW 100W 2 5 3dgts See note Note 40Hz 1KHz 0 600V 0 400A PF 0 1 Vpeak lt 850V DC Power 40kW 10W 1 5 3dgts 0 250V 0 400A 240kW 100W 1 5 3dgts DC Current 400A 100mA 1 5 3dgts 600A DC AC Current 50 60Hz 40 1kHZ 400A 100mA 1 5 3dgts 2 5 4dgts 600A AC DC Voltage 400V 0 1V 1 0 2dgts 800V DC AC Voltage 50 60Hz 40 to 200Hz 600V 1V 1 5 2dgts 2 0 4dgts 800V AC Frequency 100 to 0 01Hz 0 8 2dgts Sens 10V 600V AC 1000k 2 Ver 2 0 12 02 3 FRONT PANEL DESCRIPTION 1 Current sense jaw 6 One touch DCA zero key shown with conductor inside jaw 7 LCD Display 2 Measurement Trigger 8 40 segment bargraph display 3 Function switch 9 Handstrap 4 Data Hold key 10 Positive input terminal for V W HZ 5 Max Min key 11 COM terminal International Symbols Bc Voltage Refer to explanation in BC Current owners manual AC Voltage Dangerous voltage risk AC Current of electrical shock 4 SAFETY INSTRUCTIONS
5. n the LCD 5 3 DC 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 400A DC range 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 5 4 AC Voltage Measurements WARNING To avoid electric shock or damage to the meter do not make any voltage measurements that exceed the maximum specified 1 Set the Function switch to the VAC position 2 Insert the test leads to the meter as follows Red lead to V W Hz terminal Black lead to the COM input 3 With the pointed end of the test leads measure voltage Remember that voltage measurements are made in parallel with the device circuit under test 4 Read the ACV value on the LCD 4 380940 Ver 1 3 8 99 5 5 DC Voltage Measurements WARNING To avoid electric shock or damage to the meter do not make any voltage measurements that exceed the maximum specified 1 Set the Function switch to the VDC position 2 Insert the test leads to the meter as follows Red lead to V W Hz terminal Black lead to the COM input 3 With the pointed end of the test leads measure voltage Remember that voltage measurements are made in parallel with the device or circuit under test 4 Read the DCV value
6. o Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Copyright 2002 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form T Tech Support Hotlines 781 890 7440 ext 200 support extech com www extech com 6 380940 Ver 1 3 8 99
7. on the LCD 5 6 Frequency Measurements 1 Set the 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 6 ADVANCED FEATURES 6 1 Relative Measurements 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 To return to normal operation press and hold the zero key for 2 seconds 4 Note that Relative mode is not available if MIN MAX mode is enabled 6 2 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 6 3 MIN MAX Readings 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 met
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