TENTECH MD-5075x User Manual Download Page 32 | Manualshive

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A typical example of this situation is when the insulation resistance
between primary and secondary windings of a transformer mounted
inside a metal housing is to be measured.

Rx: Insulation resistance between primary and secondary winding.
R1: Insulation resistance between primary winding and housing.
R2: Insulation resistance between secondary winding and housing.

If the insulation tester (terminals V and R) is connected to transformer
terminals A and B, and considering that the resistance of the coils on
each side of the transformer may be disregarded, Rx appears to be in
parallel with (R1 + R2). The situation is changed if we connect the
transformer housing to GUARD terminal. Then the circuit will be:

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Summary of Contents for MD-5075x

Page 1: ...137mm x 190mm P 37 P 03 Manual de uso Meg hmetro digital Digital insulation tester User guide TENTECH CORPORATION 7330 NW 66th ST Miami FL 33166 Phone 1 305 938 0389 Fax 1 786 401 7165 www tentech co...

Page 2: ...3 MD 5075x 5 kV Insulation tester User guide GF 2015RA 2016 TENTECH All rights reserved...

Page 3: ...at there are not any voltage difference between the points to which the equipment will be connected to neither between them and ground The panel terminals and connectors of the equipment must stay dry...

Page 4: ...il Test mode 19 7 How to perform tests 20 7 1 Measurement of the Dielectric Absorption Index DAI 22 7 2 Measurement of the Polarization Index PI 23 8 Other functions 24 8 1 Backlight 24 8 2 Filter 24...

Page 5: ...zation and Dielectric absorption index automatic measurement Measurement of Leakage Current and Capacitance TIMER to program resistance test time Limit allowing making test type Pass Fail with program...

Page 6: ...7 2 Panel control functions Voltage output terminal V Zero reference terminal R Guard G Terminal Display Keyboard High Voltage led On Off key USB communication port Power supply input Printer...

Page 7: ...the filter that minimizes the interferences of the external noise Indicates that the filter is on Shows the calculated value on the display as a result of a Step Voltage Test SVT Polarization Index P...

Page 8: ...00 V selected Selection of 1 kV test voltage Indicates 1 kV selected Selection of 2 5 kV test voltage Indicates 2 5 kV selected Selection of 5 kV test voltage Indicates 5 kV selected These keys decrea...

Page 9: ...t results in the corresponding measuring unit elapsed time since the measurement started selected test voltage analogue indication by means of a bargraph and several messages to the operator are displ...

Page 10: ...ng one second Steady red light Battery under charge Flashing red light The battery was not successfully charged It denotes some trouble in the battery charging process Steady green light The charge ha...

Page 11: ...075x shall be connected to Please check the same between those points and the ground At the time of the connection and power on the equipment automatically enters in the voltmeter mode and begins to e...

Page 12: ...the equipment V output terminal the BNC terminal of the black cable to the zero reference R terminal and the alligator terminals to the element to be measured as indicated in the next figure The test...

Page 13: ...t potential setting is fulfilled If the measurement is performed between two parts which are not grounded for example between two phase conductors in a three phase cable the equipment GUARD terminal m...

Page 14: ...imum resistance limit for Pass Fail tests 6 1 Test voltage definition In order to define the test voltage value first it is necessary to select one of voltage adjustment keys These keys enable both th...

Page 15: ...test mode is activated pressing key 6 2 1 Normal mode The normal mode is used in the resistance measurement with unique voltage without time limit When selected there are no special indications in the...

Page 16: ...tance before advancing towards the following step The use of voltage adjusting keys determines the value of the highest voltage which will be in all cases a multiple of 500 V up to a 5000 V limit It i...

Page 17: ...the MD 5075x setting for the performance of a pre set duration test when this mode is selected the display shows the programmed time Use and keys to define the duration of the tests in 1 minute 3 min...

Page 18: ...le values are 10 M 100 M 1 G or 10 G During a Pass Fail test the MD 5075x will indicate when the insulation resistance is lower than the programmed limit both with an intermittent beep and the key led...

Page 19: ...e WAIT As soon as the MD 5075x selects the appropriate range the display will show the number of test the selected voltage value exhibiting the value of the applied voltage and the leakage current dat...

Page 20: ...nA date and time NOTE If the resistance measured is greater than 5 T 5 kV the following message will be exhibited R 5T ATTENTION Please never connect or disconnect the test leads with the equipment u...

Page 21: ...inute of measurement in case the key is pressed before this minimum limit the display will show the message of value exhibition of DAI value but will not show any value The polarization index is the q...

Page 22: ...pressed before this minimum limit the display will show the message of value exhibition of PI value but will not show any value The polarization index is the quotient between the values of the insulat...

Page 23: ...ses it is convenient to press the key before starting the measurement activating the filter which allows for the reaching of the insulation resistance value in an upward curve without significant osci...

Page 24: ...V 50 nF up to 5 F 2 500 V 30 nF up to 2 F 5 000 V 30 nF up to 1 F Precision 10 of the measured value 3 digits Note 0 will be exhibited on the display when measuring values lower than 50 nF 8 6 Hold T...

Page 25: ...ressed in order to check the battery status during measurements The analogue bargraph will give an approximate visual representation of the remaining charge percentage additionally the display will sh...

Page 26: ...driver is automatically found then you need to insert the CD ROM supplied with the equipment in the PC run the executable usb install exe and click in Install 9 1 T Logger software This software makes...

Page 27: ...t it complete including the heading ATTENTION Don t pull the paper The printer can be easily damaged This printer uses 56 mm wide thermal paper which comes in a 30 mm diameter reel Pull the lever loca...

Page 28: ...1 nA up to 3 mA 10 of the reading 3 digits Capacitance measurement 50 nF up to 10 F 500 V 50 nF up to 5 F 1 000 V 30 nF up to 2 F 2 500 V 30 nF up to 1 F 5 000 V Precision 10 of the reading 3 digits...

Page 29: ...ment mm ss format up to 90 00 Environmental protection index IP54 with closed lid Safety In accordance with IEC 61010 1 Electromagnetic compatibility E M C In accordance with IEC 61326 1 Electromagnet...

Page 30: ...31 Supplied accessories 3 measurement cables AC Adapter USB cable Carrying bag Operation manual License for T Logger software Subject to technical change without notice...

Page 31: ...n of this terminal let us start reviewing the insulation tester basic circuit diagram of fig 1 Where Vt DC high voltage generator Ri Generator internal resistance A Indicator meter micro ammeter The u...

Page 32: ...tion resistance between primary winding and housing R2 Insulation resistance between secondary winding and housing If the insulation tester terminals V and R is connected to transformer terminals A an...

Page 33: ...rough R2 originates a certain error since it creates an additional voltage drop in R1 which was not regarded during equipment calibration As regards the practical use of instrument it shall be conside...

Page 34: ...s warranty obligation is limited at TENTECH s option to free of charge repair or replacement of the defective product within the warranty period or to refund of the purchase price Any costs for transp...

Page 35: ...36 Notes...

Page 36: ...37 MD 5075x Meg hmetro digital hasta 5 kV Manual de uso 2016 TENTECH Todos los derechos reservados...

Page 37: ...dor puede provocar la actuaci n de los fusibles que protegen las salidas del equipo Antes de conectar el meg hmetro verifique usando p rtigas adecuadas que no existan potenciales peligrosos en los pun...

Page 38: ...6 6 Modo de ensayos Pasa No pasa 53 7 Realizando ensayos 54 7 1 Midiendo el ndice de absorci n diel ctrica 56 7 2 Midiendo el ndice de polarizaci n PI 57 8 Otras funciones 58 8 1 Backlight 58 8 2 Filt...

Page 39: ...ici n de la Corriente de Fuga y de la Capacitancia TIMER para programar el tiempo del ensayo de resistencia L mite que permite realizar ensayos del tipo Pasa No pasa con l mite programable Ensayo de e...

Page 40: ...controles del panel Borne de salida de tensi n V Borne de referencia cero R Borne Guard G Display Teclado Led de alta tensi n Llave de encendido Puerta de comunicaci n USB Entrada de la fuente de ali...

Page 41: ...ue minimiza interferencias de ruido externo Indica que el filtro est activado Muestra en el display el valor calculado como resultado de un Ensayo de Escalones de Tensi n SVT de ndice de Polarizaci n...

Page 42: ...Indica 500 V seleccionado Selecci n de la tensi n de ensayo de 1 kV Indica 1 kV seleccionado Selecci n de la tensi n de ensayo de 2 5 kV Indica 2 5 kV seleccionado Selecci n de la tensi n de ensayo d...

Page 43: ...co LCD son exhibidos el resultado de las mediciones en la unidad correspondiente el tiempo transcurrido desde el inicio de la medici n la tensi n de ensayos seleccionada la indicaci n anal gica por ba...

Page 44: ...a alternadas Evaluaci n del estado inicial de la bater a al conectar la fuente durante un segundo Luz roja permanente Bater a en carga Luz roja intermitente Indica problema de carga de la bater a Luz...

Page 45: ...a los cuales se conectar el MD 5075x ni entre stos y tierra Al ser conectado el equipo entra autom ticamente en el modo volt metro y pasa a exhibir en el display la tensi n y la corriente presentes e...

Page 46: ...borne de salida de tensi n V del meg hmetro Conecte el terminal BNC del cable negro al borne de REFERENCIA CERO R y los terminales cocodrilo al elemento a medir como indica la figura abajo Los termina...

Page 47: ...medici n se realiza entre dos puntos que no est n conectados a tierra por ejemplo entre dos conductores de fase en un cable trif sico el borne GUARD del meg hmetro se debe conectar a tierra Esto impl...

Page 48: ...ncia m nima para ensayos Pasa No pasa 6 1 Definiendo la tensi n de prueba Para definir el valor de la tensi n de prueba es necesario seleccionar primero una de las teclas de ajuste de tensi n Estas te...

Page 49: ...tiva presionando la tecla 6 3 Modo normal El modo normal es usado en la medici n de resistencia con tensi n nica sin l mite de tiempo Cuando est seleccionado no hay ninguna indicaci n especial en el d...

Page 50: ...de pasar al escalone siguiente Usando las teclas de ajuste de tensi n determine el valor de la tensi n m xima que ser en todos los casos un m ltiplo de 500 V hasta un l mite de 5000 V Es recomendable...

Page 51: ...MD 5075x para la realizaci n de un ensayo con duraci n preestablecida Cuando este modo est seleccionado el display muestra el tiempo programado Use las teclas y para definir la duraci n de los ensayo...

Page 52: ...los valores posibles son 10 M 100 M 1 G o 10 G Durante un ensayo Pasa No pasa el MD 5075x indicar con un BIP intermitente y con el led de la tecla parpadeando cuando la resistencia de aislaci n sea i...

Page 53: ...nas el MD 5075x seleccione la escala adecuada el display mostrar el n mero de ensayos el valor de la tensi n seleccionada exhibir el valor de la tensi n aplicada y de la corriente de fuga fecha y hora...

Page 54: ...fuga 4 17 nA la fecha y la hora OBS Si la resistencia a ser medida sobrepasara el l mite de 5T 5kV ser exhibido el mensaje R 5T ATENCI N Nunca conecte o desconecte los cables de prueba con el meg hme...

Page 55: ...o de 1 minuto de medici n en caso de que la tecla sea presionada antes de este l mite m nimo el display mostrar el mensaje de exhibici n do valor do DAI pero no mostrar ning n valor El ndice de polari...

Page 56: ...la tecla sea presionada antes de este l mite m nimo el display mostrar el mensaje de exhibici n del valor del PI pero no mostrar ning n valor El ndice de polarizaci n es el cociente entre los valores...

Page 57: ...istencias mayores que 100 M En estos casos es conveniente presionar la tecla antes de iniciar la medici n activando el filtro que permite alcanzar el valor de resistencia de aislaci n en una curva asc...

Page 58: ...nF hasta 10 F 1 000 V 50 nF hasta 5 F 2 500 V 30 nF hasta 2 F 5 000 V 30 nF hasta 1 F Precisi n 10 del valor medido 3 d gitos Observaci n en la medici n de valores inferiores a 50 nF ser exhibido 0 en...

Page 59: ...0 del total el mensaje de bater a d bil Battery Low aparecer autom ticamente en el display 8 8 Memoria Este equipo tiene una memoria interna para hasta 4000 valores de medici n aprox 280 ensayos de DA...

Page 60: ...ticamente insiera el CD ROM fornecido con el equipo en su computadora y ejecute el archivo usb install exe y haga clic en Install 9 2 Software T Logger Este software facilita la comunicaci n entre el...

Page 61: ...tulo Atenci n No tire del papel La impresora puede ser f cilmente da ada La impresora utiliza papel t rmico de 56 mm de ancho en una bobina de 30 mm de di metro La siguiente figura muestra como insert...

Page 62: ...ta 3 mA 10 de la lectura 3 d gitos Medici n de capacitancia 50 nF hasta 10 F 500 V 50 nF hasta 5 F 1 000 V 30 nF hasta 2 F 2 500 V 30 nF hasta 1 F 5 000 V Precisi n 10 de la lectura 3 d gitos Corrient...

Page 63: ...rado Indica el tiempo transcurrido desde el inicio de la medici n en el formato mm ss hasta 90 00 ndice de protecci n ambiental IP54 con la tapa cerrada Seguridad Conforme con IEC 61010 1 Compatibilid...

Page 64: ...s provistos 3 Cables de medici n Fuente de alimentaci n Cable USB Bolsa para transporte Manual de operaci n Licencia de uso del software T Logger Especificaciones t cnicas sujetas a alteraciones sin a...

Page 65: ...nita Rx se conecta entre los bornes V y R Su valor determina la corriente que circula en el circuito que es le da por el circuito de corriente del microprocesador representado en la figura como un nan...

Page 66: ...R1 circula una corriente que no pasa por el circuito de corriente del microprocesador nano amper metro y por lo tanto no afecta la lectura Haciendo un an lisis m s detallado se observa que la corrient...

Page 67: ...el mismo per odo de garant a que el propio equipo La obligaci n de TENTECH est limitada a alguna de las siguientes acciones a criterio exclusivo del fabricante la reparaci n sin cargo del producto o s...

Page 68: ...69 Apuntes...

Page 69: ...70 Apuntes...

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