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HP (Hewlett-Packard) 380976 - page 1
User Guide 1 Φ /3 Φ 1000 Amp True RMS Power Clamp-On Model 380976 ...
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HP (Hewlett-Packard) 380976 - page 2
380976 V3.1 6/ 08 2 Introduction Congratulations on your purchase of the Ex tech 380976 Po wer Clamp-On Meter. Th is device measures 1 Φ /3 Φ Power (True, Apparent, a nd Reactive), Horsepower, Phase Angle, True RMS Current/Voltage, Resistance, Capacitance, Frequency, & Temperature. Power measurements can be achieved on 3- or 4- wire configura ...
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HP (Hewlett-Packard) 380976 - page 3
380976 V3.1 6/ 08 3 Warranty EXTECH INSTRUMENTS CORP ORATION warrants this instrument to be f ree of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should becom e necessary to return the instrument for service during or beyond the warranty period, c ontact the ...
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HP (Hewlett-Packard) 380976 - page 4
380976 V3.1 6/ 08 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 (Hewlett-Packard) 380976 - page 5
380976 V3.1 6/ 08 5 Measurements AC + DC Voltage Measuremen ts WA RN ING The maximum input is 600V. Do no attemp t voltage measurements above this limit. Exceeding this limit coul d cause electrical shoc k 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 (Hewlett-Packard) 380976 - page 6
380976 V3.1 6/ 08 6 AC Power Measurements 1 Φ KW, KVA, KVAR, Power 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 on ...
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HP (Hewlett-Packard) 380976 - page 7
380976 V3.1 6/ 08 7 3 Φ 3-Wire KW, HP, KVA, KVAR, Power Factor & Phase Angle Measurement 1. First, measure W RS(L1L2) (r efer to the diagram below). a. Set the rotary switch to the “ V ”. b. Press and hold the “ HOLD ” key wh ile 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 (Hewlett-Packard) 380976 - page 8
380976 V3.1 6/ 08 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, pre ss the “ HOLD ” key to select desired W L12 , W L23 or W L123 di ...
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HP (Hewlett-Packard) 380976 - page 9
380976 V3.1 6/ 08 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 o ...
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HP (Hewlett-Packard) 380976 - page 10
380976 V3.1 6/ 08 10 3 Φ 4-Wire KW, HP, KVA, KVAR, Power 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 NGE ” key w hile setting the rotary switch to the “KW/KVA” position, the 3 φ 4W and W L1 symbols should appear ...
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HP (Hewlett-Packard) 380976 - page 11
380976 V3.1 6/ 08 11 3. Third, measure W T(L3) (refer to the diagram th at follows the steps below) a. Disconnect the test probe from the phase where the jaws were clamped in the previous measurement. b. Connect the test probe of the V (red) terminal to the third phase (e. g. T or L3 phase). c. Clamp the phase where the test probe is connected to ( ...
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HP (Hewlett-Packard) 380976 - page 12
380976 V3.1 6/ 08 12 4. The power clamp will proce ss these three sets of dat a (W L1, W L2 W L3 ) and show t he result o n the LCD. Th e WL 123 symbol will be shown t o indicate the 3 φ 4W pow er (refer t o diagr am). The 3 φ 4W power value in watts is now stored in the meter’s memory. 5. To read a single data record, use the “ HOLD ” key ...
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HP (Hewlett-Packard) 380976 - page 13
380976 V3.1 6/ 08 13 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 dat a. NOTE 1. The "+" sign printed on meter must face the power source for accurate measurement. 2. If the device ...
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HP (Hewlett-Packard) 380976 - page 14
380976 V3.1 6/ 08 14 Capacitance Measureme nts 1. Fully discharge the capacitor under test before proceeding. 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 (Hewlett-Packard) 380976 - page 15
380976 V3.1 6/ 08 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 exit the Data Hold mode, press the key again (the HOLD icon will switch off). Note that the Data Hold mode is not avail ...
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HP (Hewlett-Packard) 380976 - page 16
380976 V3.1 6/ 08 16 Automatic Sleep Mode and Battery Replacement The Meter is powered by a 9V battery. An AUTO SLEEP feature is included to prese rve battery life. Note: The Auto Power OFF feature is disabled when the meter is in the MIN/MAX mode Note: In the sleep mode the meter continues to dr aw a small amount of battery current. Always turn th ...
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HP (Hewlett-Packard) 380976 - page 17
380976 V3.1 6/ 08 17 Specifications General Specifications Display Dual Display; 4-digit, 10,000 count (0 to 9999) LCD Jaw Opening 1.6” (42mm) Max. Input limit Max. voltage between any terminal and ground: 6 00Vrms Sampling rate 2.5 times per second (Digital Display); Once every 6 seconds (KW, KVA, and KVAR) Auto Sleep After approx. 30 minutes (f ...
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HP (Hewlett-Packard) 380976 - page 18
380976 V3.1 6/ 08 18 Measurement Specificatio ns Accuracy: ± ( % of rdg + number of digits) from 18 o C to 28 o C (64 o F to 82 o F) R.H. < 80% AC Current (50Hz to 400 Hz) True 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 (Hewlett-Packard) 380976 - page 19
380976 V3.1 6/ 08 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 ±(2.5% + 15 d) 600V Diode (Continuity <40mV) Range Resolution Accura ...
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HP (Hewlett-Packard) 380976 - page 20
380976 V3.1 6/ 08 20 Support line (781) 890-7440 Technical support: Extension 200; E-m ail: support@extech.com Repair & Returns: Ex tension 21 0; E-mail: repair@ex tech.com Product specifications subject to change without notice For the latest v ersion of this User Gui de, Software updates, and other up-to-the-minute product in formation ...
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