USER MANUAL IN PDF - Extech Instruments
Contents
1. signals pose a shock hazard Disconnect circuits under test from the main power supply and disconnect all loads before taking resistance capacitance and continuity measurements Environmental Conditions 1 Installation Category III 2 Pollution Degree 2 3 Altitude 2000 meters max 4 Indoor use only International Safety Symbols CAUTION CAUTION Refer to Risk of Double documentation Electrical Insulation Shock 3 Model 380974 V1 8 Sept 2003 Meter Description 1 Transformer jaws 2 Jaw opening trigger 3 LCD Display 4 PEAK HOLD button 5 DATA HOLD button 6 Rotary select switch ee EXTECH 380974 7 COM or L2 S Input ee 8 VOLT OHM or L1 R input el 9 Positive L3 T and CAP input 10 Frequency Hz button 11 MAX MIN button e 3000 l l l l 0 1 2 3 4 TE Automatic Shut Off Feature The meter shuts off automatically after 30 minutes to conserve energy To defeat this feature 1 2 3 4 Turn the meter off Hold down the PEAK or the MAX MIN button while turning the meter on The Auto Power Off feature will now be disabled Note that when the meter is turned off the Auto Power Off feature is enabled again 4 Model 380974 V1 8 Sept 2003 Meter Operation Measurement Preparation J 2 3 Use the rotary selector switch to choose the appropriate range and function Ensure that the selected range matches the measurement to be taken If the measured current is hi2. to 400Hz 3 0 5d 40 to 400Hz 3 Phase 80V to 480V Frequency Response 40Hz to 400Hz sequence Resistance 1 0 5d Sensitivity 10A clamp 30V leads Capacitance 400uF 3 5d Continuity Audible alert lt 40 ohms Open circuit lt 3V short circuit 0 8mA PEAK HOLD AC Voltage Accuracy of reading Capture 400V 2 5 10d ame 600V 1V toms FAC Current COSS S S S 25 100 Overload Protection AC Current Frequency clamp 1100A AC Voltage Sequence Resistance Capacitance Frequency leads 600V rms Specification notes Accuracy is of reading number of digits at 64 to 82 F 18 to 28 C lt 80 RH The accuracy specs apply to measurements taken in the largest circle inside the clamp jaw see diagram Circle inside clamp jaws 2 Model 380974 V1 8 Sept 2003 Safety Information Read the following safety information carefully before attempting to operate or service the meter To avoid meter damage do not exceed the maximum specified input limits Do not use the meter if the test leads appear damaged Use caution when working near bare conductors or bus bars Accidental contact with a conductor may cause electrical shock Use this meter only as specified in this manual otherwise the protection provided by the meter may become impaired Read the operation manual before use and follow all safety instructions Use caution when working with voltages that exceed 60VDC or 30VAC such
3. Hz button For measuring the frequency of a voltage using test leads connect the black test lead to the COM terminal and the red test lead to the V Q terminal Note that in the 400V range the minimum threshold is 30V Connect the other ends of the test leads to the circuit component or other device under test For measuring the frequency of a current signal using the clamp fully enclose the conductor under test in the jaws Read the displayed measurement value on the LCD 5 Model 380974 V1 8 Sept 2003
4. User s Manual EXTECH INSTRUMENTS AC Clamp Meter Phase Rotation Tester Model 380974 ee EXTECH 380974 AC Clamp Meter Phase Rotation Tester PEAK 400 400 OFF uF e 3000 am a ee a 0 1 2 3 4 TTT gt A COM A vQ Introduction Congratulations on your purchase of the Extech 380974 AC Clamp Meter Phase Rotation Tester This professional 1000A Clamp meter also provides phase rotation testing where motor direction clockwise or counter clockwise and phase sequences L1 L2 amp L3 can be displayed Careful use of this meter will provide years of reliable service Specifications Clamp jaw size 1 6 40mm Battery type 9V Range Selection Manual Display 3 3 4 digit 4000 count multi function LCD with 40 segment bargraph indication Overload Indication OL displays on LCD Power 9V battery 200 hour life typical Low Battery Indication Battery icon displays on LCD Auto Power Off After 30 minutes feature can be disabled Display update rate 1 3 updates second digital display 13 3 updates second bargraph Operating Temperature RH 32 to 122 F 0 C to 50 C lt 80 Storage Temperature RH 14 to 140 F 10 C to 60 C lt 70 Dimensions Weight 9 x 3 x 1 5 228 x 76 x 39mm 13 oz 370g Function Range Resolution Accuracy of reading digits AC Current 2 0 5d Freq range 40 to 400Hz 1000A AC Voltage 1 2 5d 40
5. gher than the selected range for long periods of time overheating can result which may damage the meter Do not measure current on high voltage conductors gt 600V AC Current Measurements Warning Ensure that all test leads are disconnected from the meter s terminals before proceeding 1 Set the Rotary selector switch to the 40 400 or 1000 Amps AC A range Open the jaw via the trigger and clamp around one of the conductors see diagram Close clamp completely around the conductor Read the displayed measurement value AC Voltage Measurements Warning Maximum AC input voltage is 600V To avoid electrical shock or damage to the instrument do not attempt to measure any voltage exceeding this limit 1 2 3 4 Frequency Measurements Note Current with clamp and voltage with test leads frequency measurements are possible with this instrument At least 10A minimum threshold must be available when measuring the frequency of a current signal with the clamp 1 2 5 INCORRECT CORRECT Set the rotary selector switch to AC Volts V Connect the black test lead to the COM terminal and the red test lead to the V Q terminal Connect the other ends of the test leads to the circuit component or other device under test See diagram Read the displayed measurement value on the LCD Set the rotary selector switch to a voltage or current position Then Press the
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