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HP Extech 380976 - page 1
User Guide 1 Φ /3 Φ 1000 Amp True RMS Power Clamp-On Model 380976 ...
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HP Extech 380976 - page 2
380976 V3.2 4/11 2 Introduction Congratulations on your purchase of the Ext ech 380976 Power Cla mp-On Meter. This device measures 1 Φ /3 Φ Power (True, Ap parent, and Reactive), Horsepo wer, Phase Angle, True RMS Current/Voltage, Resistance, Capacitance, Freque ncy, & Temperature. Power meas urements can be achieved on 3- or 4-wire config ur ...
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HP Extech 380976 - page 3
380976 V3.2 4/11 3 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for on e year from date of shipment (a six month limited warranty applies to sensors and cables). If it should bec om e necessary to return the instrument for service during or beyond the warranty period, contact the Cu ...
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HP Extech 380976 - page 4
380976 V3.2 4/11 4 Meter Description 1. Transformer Jaws 2. Jaw opening trigger 3. Data Hold & MX/MN button 4. Function Selector 5. Range button 6. Temperature input jack 7. LCD Display 8. ‘COM’ input jack 9. ‘ V ’ input jack 10. Ω µA input jack ...
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HP Extech 380976 - page 5
380976 V3.2 4/11 5 Measurements AC + DC Voltage Measure ments WA R NI NG The maximum input is 600V. Do no attempt vo ltage measurements above this limit. Exceeding this limit could cause electrical sh ock and damage to the meter. 1. Set the rotary switch to the ‘ V’ position. 2. Insert the test leads into the meter’s input jacks. (Black to ? ...
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HP Extech 380976 - page 6
380976 V3.2 4/11 6 AC Power Measurements 1 Φ KW, KVA, KV A R, Pow er Factor & Phase Angle Measurement 1. Set the rotary switch to the ‘KW/KVA’ position. 2. Insert the test leads to the meter as follows: Black to ‘COM’ and Red to ‘V’. 3. Connect the black lead to the neutral line. 4. Connect the red lead to the power line and clamp ...
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HP Extech 380976 - page 7
380976 V3.2 4/11 7 3 Φ 3-Wire KW, HP, KVA, KVAR, Pow er Factor & Phase Angle Measurement 1. First, measure W RS(L1 L2) (refer to the diagram be low). a. Set the rotary switch to the “ V ”. b. Press and hold the “ HOLD ” key while setting the rotary switch to “KW/KVA”, the 3 φ 3W and W L12 symbols will appear. c. Insert the test le ...
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HP Extech 380976 - page 8
380976 V3.2 4/11 8 3. The power clamp will process these tw o sets of data (W L12 , W L23 ), and show the result on the LCD. The W L123 symbol will be shown to indicate 3 φ 3W power. The 3 φ 3W power (in watts) is stored in the meter memory. 4. To read a single data record, press the “ HOLD ” key to select des ired W L12 , W L23 or W L123 dis ...
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HP Extech 380976 - page 9
380976 V3.2 4/11 9 NOTE Once a phase is selected as COM, user s can not change this selection in the subsequent measurement. For example, if S (or L2) phase is selected, S (or L2) phase is always connected to t he COM during measurement of W RS (or W L1L2 ) and W TS (or W L3L2 ) in 3 φ 3W unbalanced power. NOTE 1. The "+" sign printed on ...
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HP Extech 380976 - page 10
380976 V3.2 4/11 10 3 Φ 4-Wire KW, HP, KVA, KVAR, Pow er Factor & Phase Angle Measurement 1. First, measure W R(L1) (refer to t he diagram below). a. Set the rotary switch to the “ V ” position. b. Press and hold the “ RA NG E ” key while setting the rotary switch to the “KW/KVA” position, the 3 φ 4W and W L1 s ymbols should appea ...
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HP Extech 380976 - page 11
380976 V3.2 4/11 11 3. Third, measure W T(L3) (refer t o the diagram that follows the steps below) a. Disconnect the test probe from the phase wher e th e jaws were clamped in the previous measurement. b. Connect the test probe of the V (red) terminal to th e third phase (e.g. T or L3 phase). c. Clamp the phase where the test probe is connected to ...
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HP Extech 380976 - page 12
380976 V3.2 4/11 12 4. The power clamp will proce ss these t hree sets of data ( W L1, W L2 W L3 ) and s how the r esult o n the L CD. The WL 123 symbol will be s hown to indic ate the 3 φ 4W power (r efer to di agram) . The 3 φ 4W power value in w atts is now stored in the meter’s memory. 5. To read a s ingle data re cord , use the “ HOLD ? ...
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HP Extech 380976 - page 13
380976 V3.2 4/11 13 KW+KVA R, KVA+ θ ( Phase A ngle) or A+V di splays. 6. W 3 φ 4W = W R(L1) + W S(L2) W T(L3) KVA K W KVAR WW W 34 2 34 2 34 φφ φ =+ PF K W KVA W W W 34 34 34 φ φ φ = 7. Set the rotary switch to another position to exit this mode and clear the stored data. NOTE 1. The "+" sign printed on meter must face the power ...
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HP Extech 380976 - page 14
380976 V3.2 4/11 14 Capacitance Me asurements 1. Fully discharge the capacitor under test before pro ceeding. 2. Insert the test leads into the input jacks. (Black to ‘COM’ and Red to ‘ ’). 3. Set the rotary switch to the ‘ ’ position. 4. Connect the red and black test leads to the capacitor. For Electrolytic (polarized) capacitor s, co ...
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HP Extech 380976 - page 15
380976 V3.2 4/11 15 Meter Control Keys HOLD - MX/MN Ke y Data Hold Function Press this key momentarily to put the meter into Data Hold mode ( HOLD will appear on the LCD). In this mode, the meter freezes the displayed reading. To e xit the Data Hold mode, press the key again (the HOLD icon will sw itch off). Note that the Data Hold mode is not avai ...
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HP Extech 380976 - page 16
380976 V3.2 4/11 16 Automatic Sleep Mode and Battery Replacement The Meter is powered by a 9V batt ery. An AUTO SLEEP feature is included to preserve battery life. Note: The Auto Power OFF feature is disabled when the meter is in the MIN/MAX m ode Note: In the sleep mode the met er continues to draw a small amount of battery curr ent. Always turn t ...
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HP Extech 380976 - page 17
380976 V3.2 4/11 17 Specifications General Specifi cations Display Dual Display; 4-digit, 10,000 count (0 to 9999) LC D Jaw Opening 1.6” (42mm) Max. Input limit Max. voltage between any terminal and ground : 600Vrms Sampling rate 2.5 times per second (Digital Disp lay); Once every 6 seconds (KW, KVA, and KVAR) Auto Sleep After approx. 30 minutes ...
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HP Extech 380976 - page 18
380976 V3.2 4/11 18 Measurement Specific ations Accuracy: ± ( % of rdg + number of digits) from 18 o C to 28 o C (64 o F t o 82 o F) R.H. < 80% AC Current (50 Hz to 400Hz) Tr ue RMS Range Resolution Accuracy (% reading) Sensitivity Overload Protection 99.99A 10mA 0.10A 999.9A 100mA ± ( 2% + 20d) (50, 60Hz) ± (4 % + 20d) (40~400Hz) 1.0A 1000A ...
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HP Extech 380976 - page 19
380976 V3.2 4/11 19 M Ω (Resistance) Range Resolution Accuracy Overload Protection 9.999M Ω 1K Ω 99.99M Ω 10K Ω ±(5% + 10 d) 600V Capacitance Range Resolution Accuracy Overload Protection 10.000 μ F 1nF 100.00 μ F 10nF 1000.0 μ F 100nF ±(1.5% + 5 d) 7000 μ F 1 μ F ±(4.5% + 15 d) 600V Diode (Continuity <40mV) Range Resolution Accurac ...
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HP Extech 380976 - page 20
380976 V3.2 4/11 20 Support line (781) 890-7440 Technical support: Ex tension 200; E-mail: supp ort@extech.com Repair & Returns: Ex tension 21 0; E-mail: repair@extech.com Product specifications subject to change without notice For the late st version of thi s User Guide, Software updates, and other up-to-the-minute pr oduct information, ...
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