Digital Ac Leakage Clampmeter

Transcript

BST-LT03 DIGITAL AC LEAKAGE CLAMPMETER INSTRUCTION MANUAL Index 1. Introduction........................................ 2. Safety Notes....................................... 3. Features............................................. 4. General............................................... 5. Specifications..................................... 6. Instrument Layout............................... 7. Operation............................................ 8. Maintenance....................................... Page 1-3 3-4 4-6 6-7 8-9 10-12 12-18 18 Due to our policy of constant improvement and development, we reserve the right to change specifications without notice. 1. Introduction NOTE This meter has been designed and tested According to IEC Publication 348, Safety Requirements for Electronic Measuring Apparatus, IEC-1010 (En61010) and other safety standards. Follow all warnings to ensure safe operation. DANGER is reserved of conditions and actions that are likely to cause serious or fatal injury. WARNING is reserved for conditions and actions that can cause serious or fatal injury. CAUTION is reserved for conditions and actions that can cause bodily injury or instrument damage. WARING ●●Read through and understand instructions contained in this manual before starting using the instrument. ●●Save and keep the manual handy to enable quick reference whenever necessary. ●●In order to avoid injury, or damage to the instrument or the circuit under test, be sure to understand and follow all safety instructions contain in the manual. -1- ●●Be sure to use the instrument only in its intended applications and to follow measurement procedures described in the manual. DANGER ●●Never make measurement on a circuit above 600 VAC. ●●Do not attempt to make measurement in the presence of flammable gasses, fumes vapour or dust. Otherwise, the use of the instrument may cause sparking, which can lead to an explosion. ●●Transformer jaw tips are designed not to short the circuit under test. If equipment under test has exposed conductive parts, possibility of shorting. ●●Never open the battery compartment cover when making measurement. ●●Never attempt to use the instrument if its surface or your hand is wet. ●●Do not exceed the maximum allowable input of any measurement range. -2- ※ CAT IV - Is for measurements performed at the source of the low-voltage installation. CAT III - Is for measurements performed in the building installation. CAT II - Is for measurements performed on circuits directly connected to the low -voltage installation. CAT I - Is for measurements performed on circuits not directly connected to mains. 2. Safety Notes Read the following safety information carefully before attempting to operate or service the meter. ●●Use the meter only as specified in this manual; otherwise the protection provided by the meter may be impaired. ●●Always keep hands behind the meter barrier. ●●Use extreme caution when clamping around uninstalled conductors or bus bars. ●●Never clamp around any conductor carrying a voltage above 600V. -3- ●●Rated environmental conditions: a. Indoor use. b. Installation category III. c. Pollution degree II. d. Altitude up to 2000 meter. e. Relative humidity 80% max. f. Ambient temperature 0~40°C. Observe the international Electrical Symbols listed below : Meter protected throughout by double insulation or reinforced insulation. Warning ! Risk of electric shock. Caution ! Refer to this manual before using the meter. Alternating current. Earth (ground) terminal. Application around and removal from hazardous live conductors is permitted. 3. Features The meter is a unique digital clamp meter for both very low current and high current measurements. Its shielded transformers jaws minimizes the effect of external stray magnetic field, enabling leakage current measurements. -4- ●●Measures from 0.1mA to 1000A AC and provides frequency response higher than 1kHz on all measuring ranges. ●●Provides a frequency selector switch - 50/60Hz or WIDE - to turn on or off an incorporated low pass filter. This permits current measurement in mains fundamental frequency only or a wide range of frequencies, including those from such devices as inverters. ●●Data hold function to allow for easy readings in hard-to-reach locations. Display can be observed away from the conductor. ●●Safety standard : IEC/EN61010-1. EN61010-2-032 EN61326-1+A +A EN55011 EN61000-3-2 EN61000-3-3 EN61000-4-2+A EN61000-4-3+A EN61000-4-4 EN61000-4-5 EN61000-4-6 EN61000-4-11 -5- ●●Safety design throughout with no exposed metal parts, shielded banana plugs and recessed input terminals. ●●Low battery indication. 4. General ●●Display : 3½ digit (2000 counts). ●●Low Battery Indication : " " sign appears on the display when the battery voltage drops below accurate operating level. ●●Operating Principle : Dual slope integration. ●●Conductor Size : Approx. 55mm max ●●Overload protection : ACV 600V ●●Data Hold Indication : HOLD ●●Response Time : Approx. 1 second. ●●Sample Rate : Approx. 2 times per second. -6- ●●Dimensions : 260(L) x 95(W) x 43(D)mm ●●Weight : Approx. 540g (battery included) ●●Power source : One type PP3, 6F22, 006P(or equivalent), 9V manganese. ●●Temperature & Humidity for Guaranteed : 23°C ±10°C at< 80% max. relative humidity. ●●Storage Temperature & Humidity : -20°C to 60°C at< 80% max. relative humidity. ●●Battery Life : Approx. 100 hours on continuous use. (Alkaline) ●●Accessories : Test leads Carrying Case Instruction Manual Battery (one 006P 9V) -7- 5. Specifications (All at 23°C±5°C, ≤80%R.H) Measuring Ranges and Accuracy ●●AC Current : Accuracy Ranges 50/60Hz 200mA(0~199.9mA) 2A(0~1.999A) 20A(0~19.99A) 200A(0~199.9A) 0~500A WIDE Time Limit of Measuring 50/60Hz : ±(1.0%rdg+2dgt) ±(1.5%rdg+2dgt) 40/1000Hz : ±(3.0%rdg+2dgt) 50/60Hz : ±(1.5%rdg+2dgt) continuous ±(2.0%rdg+2dgt) 40/1000Hz : ±(3.5%rdg+2dgt) ±(2.0%rdg+2dgt) 1000A 501~1000A ±5.5%rdg 50/60Hz : ±(1.5%rdg+2dgt) 40/1000Hz : ±(3.5%rdg+2dgt) 50/60Hz : ±5.0%rdg 10min 40/1000Hz : ±10%rdg ●●Effect of External Stray Magnetic Field 10mA AC max. In proximity to a 10mm-dia conductor carrying 100A AC. -8- ●●Effect of Residual Current 10mA AC max. When clamping on two 10mm-dia conductors, each carrying supply or return 100A AC current. ●●AC Voltage : Range Resolution 200V 0.1V 600V 1V -9- Accuracy ±(1.5%rdg+3dgt) ±(1.5%rdg+3dgt) 6. Instrument Layout (1) (2) (3) (6) (7) (4) (8) (5) (9) -10- (10) (1) Transformer Jaws Pick up the AC current flowing through the conductor. (2) Barrier Provide a protective distance from hands to conductor. (3) Jaw Trigger Press the lever to open the transformer jaws. When the lever is released, the jaws will close again. (4) Power Function/Range Switch Select function and range. It is also used to turn power on or off. CAUTION Always set the power Function/ranges Switch to the off position after use (5) LCD Display Field effect liquid crystal display with maximum indication of 1999. Function symbol(mA,A) and decimal point automatically appear as the function/ range switch is turned." "Is displayed on the lower left corner for low battery warning and "1"is displayed only at the highest digit for over range indication. -11- (6) Frequency Selector Switch Makes frequency response selection. (7) Off / MAX Selector Switch The meter displays the maximum value when the "MAX" function is on. (8) Hold Button Press the HOLD button (HOLD annunciator turns on) makes the meter stop updating the LCD display. This mode can nested in most of the special modes. HOLD function can be cancelled by changing the measurement mode, pressing the RANGE button, or Press the HOLD button again. (9) COM Terminal This is the ground input terminal. Use the BLACK Test lead to connect. (10) Volt Terminal This is positive input terminal for voltage measurement. Use the RED test lead to connect. 7. Operation 7-1 Preparation (1) To check battery set the function/range switch (4) to the desired position. If the display is clear without symbol " "showing, battery voltage is sufficient. -12- If the display blanks or " " is indicated, replace the battery in accordance with the battery replacement procedures as described in section. Note : " " also appears on the display when the battery becomes exhausted during use. Replace with a new battery. (2) Make certain that data hold button is in the off position-not pressed down. If a measurement is made with the data hold button pressed in, the display remains locked irrespective of input. 7-2 AC Current Measurement WARNING ●●Do not make measurement on a circuit above 600V AC. ●●Transformer jaw tips are designed not to short the circuit under test. If equipment under test has exposed conductive parts, however, extra precaution should be taken to minimize the possibility of shorting. ●●Do not make measurement with the battery compartment cover removed from the instrument. -13- CAUTION ●●Transformers jaws, especially their tips, have been precisely adjusted to obtain maximum accuracy. Take sufficient care to avoid shock, vibration or excessive force when handing the instrument. ●●When a foreign substance is stuck in the jaw tips or they cannot properly engage, the transformer jaw fo not fully close. In such a case, do not release the jaw trigger suddenly or attempt to close the transformer jaws by applying external force. Make sure that the jaws close by themselves after removing the foreign substance or making them free to move. ●●The maximum size of conductor that can be measured is approx. 55mm in diameter. An accurate measurement cannot be made on a conductor larger than this, because the transformer jaws cannot be fully closed. ●●Frequency selector switch (6) is designed to select the 50/60Hz and "WIDE" frequency ranges. For further details, refer to section 7-3 for operation of the frequency selector switch. -14- ●●The transformer jaws may buzz when measuring large current. This has no effect on the instrument's performance or safety. (1) Set the function/range switch to the desired position. Do not exceed the maximum allowable input current for the selected range. (2) For normal measurement, press the jaw trigger to open the transformer jaws and clamp onto one conductor only. See Figure1. Earth leakage current or small current or small current that flow through a grounded wire can also be measured by this method. (Fig.2) It is recommended that the conductor is placed at the center of the closed transformer jaws. (3) To measure out of balance leakage current, clamp onto all conductors except a grounded wire. The leakage current measured will be indicated on the display.(Fig.2 & Fig.3) -15- Fig.1 Normal AC Current Measurements Fig.2 Leakage Current Measurements on the Single-Phase System Fig.3 Leakage Current Measurement on Three-Phase System -16- 7-3 How to Use The Frequency Selector Switch The meter has a very good frequency response because of the electromagnetic property of its transformer jaws. Therefore, it measures AC current not only of fundamental frequency of 50Hz or 60Hz, but of high frequencies and harmonics superimposed on the fundamental frequency. To eliminate these superimposed components and measure only in the fundamental frequency, The meter has a high-cut filter circuit, which can be activated by setting the frequency selector switch to the "50/60Hz" position. The high-cut filter has a cut-off frequency of approx. 120Hz and an attenuation characteristics of approx.-24db/octave. ●●WIDE(40Hz-over 1kHz) : Covers a wide frequency band from mains supply to high frequencies generated by such equipment as inverters. ●●50/60Hz (40Hz-Approx. 120Hz) : Filters out high frequency components to restrict measurement in mains frequency band. 7-4 How to Use Data Hold Function Push in the Data Hold button to freeze the reading. This is especially useful for taking a reading in a dimly lit or hard-to-reach locations. -17- The display can be observed away from the conductor. Push the button again to release the reading. 7-5 Voltage measurement Insert the BLACK test lead to COM and the RED one to the other terminal. Switch to AC V range for AC voltage. Use the test lead tip to the circuit and read the reading of display directly. If the reading exceed 600V, maybe the reading value is wrong and it is dangerous. 8. Maintenance Battery replacement : When low battery warning appears, change a new battery as follows : (1) Disconnect the test leads from the instrument and turn off power. (2) Unscrew the battery cover and replace a new battery. Cleaning and Storage : WARNING To avoid electrical shock or damage to the meter, do not get water inside the case. Periodically wipe the case with a damp cloth and detergent. Do not use abrasives or solvents. If the meter is not used for over 60 days, remove the battery for storage. -18-