UT521 USERS MANUAL Content Chapter Page 1. Safety Instructions 2 2. Characteristics 5 3. General Specifications 6 4. Product outlook & accessories 9 5. Preparation before measurement 10 6. Measurement Operation 11 7.
UT521 USERS MANUAL 1.Safety Instructions This operation manual includes the user guidance and safety instruction when using the tester, please read it before using. Before using the Tester, please read and understand the operating manual including the content. Keep the operating manual properly, and let it easy to get it for reference during the process of testing. When using the Tester, user must follow the testing procedure as mentioned in the operating manual.
UT521 USERS MANUAL Safety sign " "has 3 meaning in this manual, user has to pay attention to this sign" "for operation. Danger Warning Caution identifies conditions and actions that most likely pose hazard(s) or die. identifies conditions and actions that will pose hazard(s) or die. identifies conditions and actions that will pose hazard(s) or damage the Tester. Danger Do not use the Tester around explosive environment, which may cause fire and explosion.
UT521 USERS MANUAL Warning Do not use the Tester if it is damaged or metal part is exposed. Do not disassemble the tester un-intentionally. If it needs repair, please contact our after-sales services or our agents. Do not change battery or open battery compartment when the Tester is wet. Soft cloth should be used to dry it first, and then carry on. Make sure the Tester is turned off when changing battery or opening the battery compartment.
UT521 USERS MANUAL 2.Characteristics The Tester is using micro controller with high accuracy and reliability; it can measure every electric wire, electric installation, anti-thunder equipmentÃs earth resistance value of those earth system. Also, it can carry earth voltage measurement. (Note: the Tester should not be used outdoor hazard environment, like raining, thunder etc.) 2.1 2.2 2.3 2.4 2.5 With backlight display and battery check function. Data logging for 20 sets of data.
UT521 USERS MANUAL 3.General Specifications 3.1 Operating temperature and Relative humidity(20 Range Earth Voltage Earth Resistance Measure Range 0V~200V(50/60Hz) 20 0.00 ~20.00 200 0.0 2000 0 ~200.0 5 & 75%RH): Best Accuracy (1.0%+4) (2.0%+10) (20 position) (2.0%+3)(200 or 2000 position) (Auxiliary earth resistance 500 ~2000 (accuracy 5%);earth voltage 10Vac) 3.
UT521 USERS MANUAL 3.3 Measure methods: (1) Earth Voltage Testing:average respond (2) Earth Resistance Testing : testing signal frequency : around 820Hz,current : 20 position around 3.2mA 3.4 Maximum operating accuracy: Maximum operating accuracy within measure range:( 30%) 20 : 5.00 ~20.00 200 : 20.0 ~200.0 2000 : 200 ~2000 3.5 Working condition: Temperature:5 ~40 Relative humidity: 80%RH(no fog) Height above Sea Level: 2000 meters 3.
UT521 USERS MANUAL 3.7 Power source:[1.5V Alkaline Battery (AA)*6] 3.8 Overload protection: Earth Resistance:200 Vac (10 seconds) Earth Voltage:400 Vac (30 seconds) 3.9 Insulation Resistance:The insulation impedance between measure circuit and housing is not less than 20M . 3.10 Product size:160mmx70.5mmx100mm. 3.11 Product Weight:around 560g. 3.12 Accessories: Green test lead 5 meter Yellow test lead 10 meter Red test lead 20 meter Auxiliary earth stakes One plug test lead with alligator clip 1.
UT521 USERS MANUAL 4.
UT521 USERS MANUAL 5. Preparation before measurement 5.1 Battery Voltage check: Select function from OFF to EARTH VOLTAGE or EARTH RESISTANCE, LCD Display will show battery indicator : " " which show lowest battery status, and need to change battery, otherwise the Tester cannot work properly. Battery sign Battery Voltage 8.2V 7.8V~8.2V 7.4V~7.8V 7.0V~7.4V 7V 5.
UT521 USERS MANUAL 6. Measure method Warning When the Tester carry out earth resistance testing, the distance between E and C have the maximum voltage around 50V volt. Do not touch the external part of test leads and auxiliary earth stake in order to avoid shock hazard. 6.1 Precision Measurement (using standard test leads for measurement): a. place 2 ground stakes in earth/dirt.
UT521 USERS MANUAL Red Yellow Green m Auxiliary Earth Spikes m Earthed Electrode Under Test figure2 C: auxiliary electrode P: potential electrode 12 E: earth electrode
UT521 USERS MANUAL b. Earth Voltage Testing:Select function OFF to EARTH VOLTAGE, LCD display will show voltage, connect test leads in V and E, then connect to the testing point, LCD display will show earth voltage value (Attention:measure earth voltage does not need to press TEST button). If the measuring value>10V, then it need to switch-off all the related voltage equipment. Wait until the earth voltage decrease, and then do it again. Otherwise, it will affect the accuracy of earth resistance.
UT521 USERS MANUAL press"TEST"button, the button's light will be on, which shows the Tester is in measurement. (Note:when C or E does not connect properly, auxiliary earth resistance or earth resistance excess the load (like 20 excess around 14K ),or testing terminal open circuit,LCD display will show"- - - - ",then it need to double check the connection parts, whether soil is too dry, whether auxiliary earth stakes is close to earth.
UT521 USERS MANUAL f. Hold function:while testing, press slightly"Hold/Save"button,save data function will be on, the corresponding testing value will be saved and LCD display the corresponding sign. Press slightly"Hold/Save"button again, then it will cancel this function. g. Storage function: 1.storage data press"Hold/Save"button for around 2 seconds. Storage function will be on and save the corresponding data.
UT521 USERS MANUAL 6.2 Simple measurement(use simple 2-Wires test leads for measurement): This method will be used when the auxiliary earth stake cannot be used. Use the expose earth resistance object from the ground as earth, like metal water bath, water pile, wire ground, building earth, also can use 2-wires test leads method (E and P&C terminals).
UT521 USERS MANUAL When using this method, P and C have already connected together.
UT521 USERS MANUAL 7. Maintenance & Repair 7.1 Maintenance 7.1.
UT521 USERS MANUAL a. switch-off the Tester and remove all the test leads. b. release the screw in bottom part,and open battery compartment. c. Replacing all old battery (6) with new battery. d. After replacing the battery, rejoin the battery compartment and firmly screw. Remove all the batteries if the Tester do not use for a long time, so that it avoid the leakage and corrosion in the battery compartment. 7.1.
UT521 USERS MANUAL This operating manual is subject to change without notice.
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