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4.  Connect the test leads to the circuit to 

be tested. 

5.  Reapply power to the circuit, the 

measured voltage will appear on the 
display of the instrument. 

6.  If the red test lead is connected to the 

negative (or lower voltage) side of the 
circuit, a minus sign will appear on the 
display, at the left side. 

7.  Disconnect power to the circuit before 

removing the test leads from the circuit.

Three-Phase AC Volts:

This Meter is designed to primarily measure 
household AC voltage. When measuring 
THREE-PHASE circuits line-to-line, the value 
of the voltage is actually higher than the 
rated line-to-ground 3-phase voltage.
It is very important that you do not exceed 
the maximum AC (RMS) rating of this 
Meter, which is 750V AC. To find the RMS 
voltage line-to-line on a 3-phase power line, 
multiply the rated line-to-ground voltage by 
the square root of 3 (approx. 1.732).
For example, if you connect this Meter to 
a 480 Volts 3-phase line (i.e. 480 V line-to- 
ground), the  total available line-to-line 
voltage is about 832 V AC (   480 V x 1.732).
Severe damage and a dangerous shock 
hazard could result because this exceeds the 
rating of this Meter.

4.2 Measuring resistance measuring 

(resistance, continuity).

  CAUTION: TURN-OFF POWER AND 

DISCHARGE ALL CAPACITORS ON CIRCUIT TO 
BE TESTED BEFORE ATTEMPTING IN-CIRCUIT 
RESISTANCE MEASUREMENTS. FAILURE TO 
DO SO MAY END UP IN EQUIPMENT (AND/
OR INTRUMENT) DAMAGE. THE RESISTANCE 
MEASURING CIRCUIT APPLIES A KNOWN 
VALUE OF CONSTANT CURRENT THROUGH 

THE UNKNOWN RESISTANCE AND THEN 
MEASURES THE VOLTAGE DEVELOPED 
ACROSS IT. THEREFORE, REMOVE ALL 
POWER TO THE CIRCUIT UNDER TEST WHEN 
MAKING RESISTANCE MEASUREMENT. IF 
ANY VOLTAGE IS PRESENT IN THE TEST 
CIRCUIT, AN ERRONEOUS READING WILL 
RESULT. THIS METER MAY BE DAMAGED 
IF  VOLTAGE GREATER THAN 600 V AC IS 
PRESENT.

NOTE:  When measuring critically low 
resistance values, touch tips of test 
leads together and record the reading. 
Subtract this reading from an additional 
measurement to obtain the most accurate 
value.

• When measuring large resistances, reading 

may be unstable due to environmentally 
induced electrical noise. In this case, 
directly connect the resistor to input 
terminals of the Meter or shield the resistor 
at potential of the COM input terminal to 
obtain stable reading.

For resistance above 1 MΩ, the display 
might take a few seconds to stabilize.  This 
is normal for high-resistance readings.

• The Meter has a circuit to protect the 

resistance range from over-voltage (600V 
AC). However, to prevent accidentally 
exceeding the protection circuit’s rating 

Summary of Contents for UD77

Page 1: ...tienda y siga las instrucciones de seguridad contenidas en este documento antes de operar esta herramienta WARNING Read understand and follow the safety rules in this document before operating this to...

Page 2: ...TENIDO 1 INTRODUCCI N 3 2 CONSIDERACIONES DE SEGURIDAD 3 3 EXPLICACI N DE LAS FUNCIONES E INDICADORES 4 4 PRUEBAS Y MEDICIONES EL CTRICAS B SICAS 5 4 1 Medici n de voltaje 4 2 Medici n de resistencia...

Page 3: ...AS PUNTAS DE PRUEBA A AL MEDIDOR Y DESPU S AL CIRCUITO BAJO PRUEBA APLIQUE ALIMENTACI N NUEVAMENTE SI LA LECTURA ES ERR NEA DESCONECTE INMEDIATAMENTE Y REVISE OTRA VEZ TODOS LOS AJUSTES Y CONEXIONES C...

Page 4: ...l es de 10 Amps CD CA Esta terminal est protegida por fusible 6 Entienda el manual de usuario antes de usar el medidor 7 Terminal de entrada de amperaje La punta de prueba roja es conectada en esta te...

Page 5: ...os golpes y protege el medidor del uso rudo La funda est equipada con una base para piso 4 PRUEBAS Y MEDICIONES EL CTRICAS B SICAS 4 1 Medici n de voltaje ADVERTENCIA PARA EVITAR EL RIESGO DE UNA DESC...

Page 6: ...oltajes trif sicos de AC Este medidor est dise ado para medir voltaje CA dom stico Cuando se miden circuitos trif sicos de l nea a l nea el valor del voltaje es de hecho mayor que el voltaje trif sico...

Page 7: ...ici n correcta NUNCA CONECTE LAS PUNTAS DE PRUEBA A UNA FUENTE DE VOLTAJE cuando el selector giratorio se encuentre en las funciones o La corriente aplicada durante la medici n de resistencia puede da...

Page 8: ...A UNA FUENTE DE VOLTAJE cuando el selector giratorio est en la posici n En la prueba de diodo la ca da de voltaje en polarizaci n directa es mostrada cuando el diodo es polarizado de esta manera Para...

Page 9: ...bajo prueba NUNCA CONECTE LAS PUNTAS DE PRUEBA A TRAV S DE UNA FUENTE DE VOLTAJE mientras el selector giratorio se encuentre en medici n de corriente Esto puede causar da o al circuito bajo prueba o...

Page 10: ...evante la tapa del compartimiento Reemplace la bater a Inserte la nueva bater a ponga de nuevo la tapa del compartimiento y reinstale los tornillos 5 3 Prueba y reemplazo de fusible s 5 3 1 Prueba de...

Page 11: ...1 mV 10 mV 0 1 V 0 8 3 dgts 750 V 1 V 1 2 3 dgts Impedancia de entrada 10 M Funci n Ampers CD Rango Resoluci n Precisi n Ca da de Voltaje 200 A 2 mA 20 mA 200 mA 2 A 0 1 A 1 A 10 A 100 A 1 mA 0 8 1 dg...

Page 12: ...macenamiento 20 C a 60 C 4 F a 140 F Temperatura de operaci n 0 C a 45 C 32 F a 113 F Altitud 2 000 m 6 562 pies Humedad relativa 0 a 80 0 C a 35 C 32 F a 95 F 0 a 70 0 C a 35 C 45 F a 95 F Coeficient...

Page 13: ...CAL REASONS CONTENIDO 1 INTRODUCTION 14 2 SAFETY CONSIDERATIONS 14 3 EXPLANATION OF CONTROLS AND INDICATORS 14 4 BASIC ELECTRICAL TESTS AND MEASUREMENTS 16 4 1 Voltage measuring 4 2 Resistance measuri...

Page 14: ...NNECT POWER IMMEDIATELY AND RECHECK ALL SETTINGS AND CONNECTIONS Safety Tips Do not try to measure any voltage greater than 1000V DC or 750V AC RMS Voltages above 60V DC or 25V AC RMS may constitute a...

Page 15: ...ls or test lead probe ends 11 Volt resistance or diode test input terminal The red test lead is plugged into this terminal for all AC V DC V resistance continuity test and diode test functions 12 To a...

Page 16: ...EXCEEDS THE METER CAPACITY NOTE When taking voltage measurements this Meter must be connected in PARALLEL with the circuit or circuit element under test In 200mV range displayed value may fluctuate wh...

Page 17: ...suring resistance continuity CAUTION TURN OFF POWER AND DISCHARGE ALL CAPACITORS ON CIRCUIT TO BE TESTED BEFORE ATTEMPTING IN CIRCUIT RESISTANCE MEASUREMENTS FAILURE TO DO SO MAY END UP IN EQUIPMENT A...

Page 18: ...input terminal 3 Connect the test leads to the circuit to be measured 4 The measured resistance will be displayed on the LCD 4 2 2 Continuity Test This mode helps you checking electrical circuits such...

Page 19: ...e DMM does not supply enough power to turn these diode on A different kind of test leads that boost the power output are needed so that microwave diodes can be adequately tested 4 4 Measuring Current...

Page 20: ...ot use abrasives or solvents Water dirt or contamination in the A or mA A input terminals may harm this Meter Calibrate this Meter once a year to maintain its performance specifications 5 2 Battery Re...

Page 21: ...tion Accuracy 200 mV 2 V 20 V 200 V 100 V 1 mV 10 mV 0 1 V 0 8 3 dgts 750 V 1 V 1 2 3 dgts Imput imedance 10 M Function Ampers DC Range Resolution Accuracy Voltage Drop 200 A 2 mA 20 mA 200 mA 2 A 0 1...

Page 22: ...to 45 C 32 F to 113 F Altitude 2 000 m 6 562 ft Relative Humidity 0 to 80 0 C to 35 C 32 F to 95 F 0 to 70 35 C to 45 C 95 F to 113 F Temperature Coefficient 0 10 x Specified Accuracy C 18 C or 28 C...

Page 23: ...23 NOTAS NOTES...

Page 24: ...s casos a Cuando la herramienta se haya utilizado en condiciones distintas a las normales b Cuando el producto hubiera sido alterado de su composici n original o reparado por personas no autorizadas p...

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