UT525/526 Electrical Testers Operating Manual
UT525/526 Operating Manual Contents Item I. Safety Precautions Page 3 II. Features 7 III. Specifications 8 IV. Front View of the Instrument 14 V. Function of Keys and Dial Plate 16 VI. Testing Preparation 16 VII. Earth Testing 17 VIII. RCD Testing 19 IX. Voltage Testing 21 X. Insulation Resistance Testing 24 XI. Replace Battery 27 XII.
UT525/526 Operating Manual Overview UT525/UT526 is a digital multi-functional electric testing instrument adopting new design and integrating large scale analog integrated circuit, digital circuit and microprocessor chips, which can mainly test parameters of residual current device (RCD), earth, insulation resistance, DCV and ACV; with features of full functions, high accuracy, stable performance, easy and reliable operation, it is available to test RCD, insulation and earth of electric equipments.
UT525/526 Operating Manual I. Safety Precautions This instrument was designed, manufactured and tested according to IEC61010 safety standard (Safety Requirements for Electrical Equipment). This Instructions describe the warnings and safety rules which ensure the safe operation and safe state of the instrument, which the user must follow. Please read following instructions before using. ● ● ● Warning Please read and understood the Instructions before using.
UT525/526 Operating Manual Danger It means under some conditions, the operation may cause serious or fatal damages may be caused. Warning It means taking care to keep away from electric shock. It means avoiding instrument damage and gain accurate Note testing. ● ● ● ● ● ● ● Danger Do not test circuit with AC440V/DC440V or above. Do not test in the place with inflammable conditions. Do not operate the instrument if the surface of the instrument is wet or the hand is wet.
UT525/526 Operating Manual ● ● ● ● ● ● ● ● Operate carefully under the voltage over 33Vrms, 46.7Vacrms or 70Vdc, electric shock may be caused under such kind of voltage during operating. After completing high resistance testing, the charge storage of the circuit to be tested must be released. Do not replace battery if the instrument is in place with humidity. Make sure the all testing wires are connected with the testing ports firmly.
UT525/526 Operating Manual ● ● ● Do not put or use the instrument in the place with high temperature, high humidity, inflammable or explosive matters and high electromagnetic field. Do not clean the cover of the instrument with wet cloth of detergent, do not use abrasives or solvent. When the instrument is wet, please make it dry and then put it in the proper place.
UT525/526 Operating Manual II. Features Danger of electric shock may happen The instrument has double-insulation or reinforced insulation DC AC Earth ● ● ● Designed and manufactured strictly according to IEC61010 safety standard, the instrument meets with Over Voltage Standard (CATIII600V) and safety standard of Class II Pollution. Auto discharge function. Red warning light.
UT525/526 Operating Manual III.
UT525/526 Operating Manual UT525 earth testing indexes Rated voltage Test range Test current Accuracy tolerance About 5.0V 0.01Ω-200Ω ＞200mA for 0.00Ω-2.00Ω 0.01Ω-200Ω: ±(2%+5) UT526 earth testing indexes Rated voltage Test range Test current Accuracy tolerance About 5.0V 0.01Ω-2,000Ω ＞200mA within 0.00Ω-2.00Ω 0.
UT525/526 Operating Manual UT525 insulation resistance testing indexes Rated voltage 100V 250V Test range 0.05MΩ-200MΩ Open circuit voltage DC 100V±10% DC 250V±10% Rated test current 100KΩ load 250KΩ load 0.9mA-1.1mA 0.9mA-1.1mA Short circuit ＜1.8mA Accuracy tolerance 0.05MΩ-200MΩ: ±(5%+5) 10 500V DC 500V±10% 500KΩ load 0.9mA-1.
UT525/526 Operating Manual UT526 insulation resistance testing indexes Rated voltage 250V 500V Test range 0.05MΩ-200MΩ 0.05MΩ-300MΩ Open circuit voltage DC 250V±10% DC 500V±10% Rated test current 500KΩ load 1MΩ load 0.9mA-1.1mA 0.9mA-1.1mA Short circuit ＜1.8mA Accuracy tolerance 0.05MΩ-500MΩ: ±(5%+5) 11 1,000V 0.05MΩ-500MΩ DC 1,000V±10% 250KΩ load 0.9mA-1.
UT525/526 Operating Manual UT525/UT526 voltage testing indexes Test range Resolution Accuracy tolerance DCV ±0-±440V ACV 0-440 (50/60Hz), just for reference to that less than 10V 1V ±(2%+3) UT525/UT526 frequency testing indexes Test range Resolution Accuracy tolerance 20Hz-100Hz 1Hz Just for reference 12
UT525/526 Operating Manual ● ● ● ● ● ● ● ● ● ● ● ● Display: LCD display, max reading: 9999 Low battery voltage warning: Over limit indication: “OL” Auto range function Unit display: can display function, electric unit signs Work conditions: 0℃-40℃/ 85%RH or less Storage condition: -20℃-60℃/90%RH or less Dimensions: 150mm(L)×100mm(W)×71mm(D) Current consumption: about 50mA (1,000V output) (about 10mA in general condition) Accessories: testing wire, alkaline battery (1.
UT525/526 Operating Manual IV. Front View of the Instrument (see Picture 1) 1. L: jack of live wire terminal for RCD testing and positive terminal for voltage testing 2. E: jack of earth for RCD testing 3. N: jack of null wire terminal for RCD testing and input negative terminal for voltage testing 4. LINE: jack of high voltage output for insulation resistance testing 5. LCD 6. RCD current setup key and voltage testing switch key 7. RCD angles switch key and return-to-zero key 8. Test button 9.
UT525/526 Operating Manual Picture 1 15
UT525/526 Operating Manual V. Function of Keys and Dial Plate 1. I/VOLT is RCD current testing range selection and voltage testing switch key; 2. ANG/ZERO is RCD testing angle switch key and return-to-zero key before starting earth testing; 3. TEST is test key; 4. When dial plate points to Continuly, enter earth test; 5. When dial plate points to RCD/V, enter RCD testing and AC and DC voltage testing; 6.
UT525/526 Operating Manual VII. Earth Testing (see Picture 2 for the connection diagram ) Connect the object to be tested with the instrument according to the diagram, after that make the dial plate point to Continuly, and then press TEST key to start earth test. Note 1.
UT525/526 Operating Manual Picture 2 18
UT525/526 Operating Manual VIII. RCD Testing (see Picture 3 for the connection diagram) Make the dial plate point to RCD/V and press I/VOLT key to set up test current (test current: 10mA\30mA\100mA\300mA) to start RCD testing. Connection Method: Connect the red, green and blue testing wires of three-wire plug with the red (L), green (E) and blue (N) ports respectively, and then insert the three-wire plug into the 220V civil jack and press TEST key. Note 1.
UT525/526 Operating Manual Picture 3 20
UT525/526 Operating Manual IX Voltage Testing (see Picture 4 for the connection diagram) Make the dial plate point to RCD/V and the long press I/VOLT key to switch to AC, DC voltage testing state: Connection method 1: (1) Insert red testing wire into “L” input port, and black testing wire into “N” input port.
UT525/526 Operating Manual Note 1. Do not input voltage over 440V or 440Vrms. It is possible to display higher voltage, but the instrument may be damaged. 2. During testing high voltage, especially avoid electric shock. 3. After completing all the testing, cut the connection between testing wires and the circuit tested, and dismantle the testing wires from input terminal of the instrument. 4. When the battery cover is open, do not test.
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UT525/526 Operating Manual X Insulation Resistance Testing (see picture 5 for the connection diagram) Note 1. Before testing, make sure that the circuit to be tested is uncharged, do not test the insulation of charged equipment or live circuit. 2. When the battery cover is open, do not test. 3. Do not make the two pens short circuit state under high voltage input and do not test the insulation resistance after outputting high voltage.
UT525/526 Operating Manual Continuous Testing Operation Select one test voltage with dial plate (the optional voltages of UT525: 100V/250V/500V; the optional voltages of UT526: 250V/500V/1,000V) and press TEST key which is in self-locking state to make continuous testing and output insulation resistance testing voltage, and the test light become red. After completing testing, press TEST key to unlock to stop testing. Note 1.
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UT525/526 Operating Manual XI. Replace Battery (see Picture 6) Note 1. Do not use old and new batteries at the same time. 2. Pay attention to the polarity during replacing battery. Danger 1. To avoid potential electric shock, move the lead from the instrument before replacing battery. 2. When the battery cover is open, do not test 3.
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UT525/526 Operating Manual XII. Maintenance Clear the shell ● Wipe the surface with soft wet cloth or sponge. ● To avoid instrument damage, do not dip the instrument into water. ● When the instrument is wet, make it dry and then store. ● When the instrument needs to be checked or repaired, please let qualified professional maintenance man to repair or send it to the designated maintenance point.
