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Press the pushbutton to enable the 
continuity testing mode. This Meter 
defaults in the 400Ωrange and then 
highest bar graph scale shows 400. 
The digital display reads OFL.

Continuity testing verifies that 
circuit connections are intact. Test 
resistances below 35Ω cause the 
Meter to emit a continuous tone.

Input range

Beeper ON if

400 Ω

Aprox. < 35Ω

Table 1. Beeper Response in Continuity Test

The continuity mode is extremely 
fast and can be used to detect either 
shorts or opens that last for as little 
as 100 milliseconds. When a change 
is detected, the beeper tone is 
“stretched” to last at least 1/4 second, 
so you can hear it and detect both 
shorts and opens.

This can be a valuable troubleshooting 
aid when looking for intermittents 
associated with cables connections, 
switches, relays, etc. If the test 
value is very close to the threshold, 
erratic beeps can also occur due to 
environmental electrical noise (EMI).

5.11 Using SOFT mode

Observe that SOFT is displayed after 
pressing the SOFT CREST pushbutton 
once.
This SOFT mode digitally displays a 
running average of readings over 

3-second interval to reduce the 
fluctuation of the readings. The bar 
graph is unaffected by this SOFT 
function and updates 20 times per 
second.
SOFT function can be used for ampere 
readings or voltage readings.
Press the SOFT-CREST pushbutton 
twice when in the AC or DC amperes 
mode, or once when in the voltage 
mode, in order to exit SOFT.

5.12 CREST mode

Observe that PEAK is displayed after 
pressing the SOFT-CREST pushbutton 
twice. PEAK is available for AC 
ampere readings only and can not be 
selected when in the other modes.
Both the digital display and bar 
graph measure the half-cycle peak AC 
amperes when PEAK is displayed.

The crest factor of a waveform is the 
ratio of its half-cycle peak amperes to 
its rms amperes.

The Crest Factor is a nominal 1.414 for 
linear current flow without current 
wave distortion. Crest Factors other 
than 1.414 indicate the presence of 
harmonic current flow. (See 6.1 Non-
Linear Loads.)

Press the SOFT-CREST pushbutton 
once to exit CREST. Then, PEAK is no 

Содержание UD337

Страница 1: ...Lea entienda 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 t...

Страница 2: ...1 Reemplazo de bater a 5 2 Notas 5 3 Auto Prueba Encendido 5 4 Medici n de Amperaje CA 5 5 Medici n de Amperaje CD 5 6 Medici n de frecuencia 5 7 Usando la captura de datos HOLD 5 8 Medici n de volta...

Страница 3: ...ongelar lecturas en pantalla Gr fica de barras an loga de 41 segmentos que muestra simult neamente la corriente mientras mide frecuencia Indicador de bater a baja e indicador de vida de bater a al enc...

Страница 4: ...ra da o en el aislamiento o metal expuesto Verifique la continuidad de las puntas de prueba Las puntas de prueba da adas deben ser reemplazadas Desconecte la punta de prueba viva antes de desconectar...

Страница 5: ...ntalla en el modo RECORD presionando los botones MIN MAX 19 Mostrado en pantalla cuando el bot n HOLD ha sido presionado 20 Mostrado en pantalla cuando el bot n ha sido presionado 21 SOFT Mostrado en...

Страница 6: ...ales negativas 35 AUTO Mostrado cuando el rango autom tico controla la gr fica de barras escala de 0 a 40A o 0 a 400A y la posici n del punto decimal en la pantalla digital 36 POWER LOCK Mostrado en p...

Страница 7: ...costado de las quijadas del gancho y se asegure en posici n 7 Reinstale los tres tornillos de sujeci n Si el mult metro no va a ser utilizado por un periodo mayor a 60 d as remueva la bater a y gu rde...

Страница 8: ...urre aunque se est realizando una medici n Para deshabilitar el auto apagado presione el bot n ON OFF se muestra Si el bot n ON OFF es presionado otra vez el mult metro se apaga Cuando trate de utiliz...

Страница 9: ...do con corriente el valor del amperaje CD tiene una polaridad positiva o negativa dependiendo de la direcci n de la carga en el conductor Este valor es positivo cuando la corriente fluye en el conduct...

Страница 10: ...mostrado en pantalla para salir del modo HOLD Presione el bot n RANGE por 2 segundos y su ltelo para activar el modo de auto rango El mult metro emite un tono beep y AUTO se muestra en pantalla 5 8 Me...

Страница 11: ...para un par est ndar de puntas de prueba Cuando se realizan mediciones de resistencia aseg rese que el contacto entrelaspuntasdepruebayelcircuito a probar sea buena Suciedad aceite flux de soldadura o...

Страница 12: ...os modos Ambas pantallas la digital y la gr fica de barras an loga miden medio ciclo del pico de amperaje CA cuando PEAK se muestra en pantalla EL factor de cresta de una forma de onda es el radio de...

Страница 13: ...cuando los valores MAX MIN y AVG no fueron borrados El almacenamiento simplemente empieza nuevamente donde se qued Presione y sostenga el bot n MIN MAX por 2 segundos y luego su ltelo para salir del m...

Страница 14: ...sipado en el cableado transformadores y sistemas de conexi n La mayor a de los amper metros en el mercado realizan mediciones del flujo de corriente promedio no flujo de corriente RMS reales a n si es...

Страница 15: ...ltiplos impares de la 3ra arm nica llamados TRIPLENS son particularmente agregadas juntas al neutro Estas arm nicas pueden ser de una corriente RMS total en el neutro del transformador que es normalm...

Страница 16: ...OLD para congelar la pantalla digital si es necesario 6 Paraatenuarlaslecturas presione el bot n SOFT CREST una vez SOFT se muestra en pantalla o para realizar mediciones de medio ciclo del pico de am...

Страница 17: ...durante 2 segundos 6 4 Transformadores de Distribuci n Se pueden realizar mediciones de corriente excesiva balanceo de cargas entre fases valor RMS y frecuencia de la corriente en el neutro Mediciones...

Страница 18: ...cho est n completamente cerradas o las mediciones no ser n precisas 3 Observe la pantalla para leer el valor de flujo de corriente de RMS verdaderos 4 Mida una fase de salida del controlador de motor...

Страница 19: ...s segundo Pantalla an loga Actualizaci n 20 veces segundo gr fica de barras an loga de 41 segmentos Di metro m ximo de conductor 51mm 2 00 Apertura m xima de quijadas 52mm 2 04 Voltaje m ximo del cond...

Страница 20: ...marks and battery life indication greater than 40 hours on meter power up 2 RMS Min Max ADD 10 counts 3 1A and above 30Hz 45Hz 4 AVG only 2 5A and above RMS Min Max Add 2 of reading Funci n Amperajes...

Страница 21: ...99 9V 0 1V 2 5 5 0 600V 0 1V 1 0 3 1 5 5 Voltaje CA Raz n de rechazo en modo com n 80dB CD a 60Hz Voltaje CD Raz n de rechazo en modo real 11dB at 50Hz o 60Hz Raz n de rechazo en modo com n 84dB at dc...

Страница 22: ...ALIGNMENT MARKS 26 5 HOW TO USE THIS METER 26 5 1 Battery replacement 5 2 Notes 5 3 Power up self test 5 4 Measuring AC Amperes 5 5 Measuring DC Amperes 5 6 Measuring frequency 5 7 Using data hold 5...

Страница 23: ...on the digital display Low battery indicator and battery life indicator at powerup using bar graph Auto power off after 10 minutes of inactivity and power lock to disable the automatic power off funct...

Страница 24: ...the live test lead before disconnecting the common test lead Be sure this Meter is in good operating condition During a continuity test a meter reading that goes from overflow OFL to 0 generally mean...

Страница 25: ...adings or Hz or V readings are softened out over 3 second intervals 22 K VHz Displayed when measuring resistance voltage or frequency 23 PEAK Displayed when current flow readings are in halfcycle peak...

Страница 26: ...overload 38 OFL Overflow Indication 4 ALIGNMENT MARKS Position the conductor within the jaws at the intersection of the indicated marks as much as possible Figure 1 in order to meet this Meter s accu...

Страница 27: ...re not readily apparent WARNING MOST OF THE TYPICAL APPLICATIONS ARE EXPOSED TO LETHAL VOLTAGES BE CAUTIOUS WHEN TAKING MEASUREMENTS BEFORE THE METER IS CONNECTED TO ANY CIRCUIT REVIEW THE SAFETY INFO...

Страница 28: ...beep sound and displays AUTO 5 5 Measuring DC Amperes Press the AC DC pushbutton to select the DC amperes measurement mode AC disappeared on the LCD but the meter is still in the autoranging mode AUTO...

Страница 29: ...or 2 seconds and then release in order to return to autoranging mode This Meter acknowledges with a beep sound and displays AUTO on the digital display Press the other function A or V or or pushbutton...

Страница 30: ...graph blinks and the digital display reads OFL AUTO autoranging is applied to the bar graph This Meter measures resistance by comparing the internal reference resistance given by a resistor array with...

Страница 31: ...e Observe that SOFT is displayed after pressing the SOFT CREST pushbutton once This SOFT mode digitally displays a running average of readings over 3 second interval to reduce the fluctuation of the r...

Страница 32: ...he CREST that is PEAK function is not available in the other V or Hz or modes To stop recording use the HOLD pushbutton Then RECORD no longer blinks and the values of MAX MIN and AVG are frozen Press...

Страница 33: ...splayed 6 MEASUREMENT APPLICATIONS 6 1 Non Linear Loads True RMS current flow is very important because it directly relates to the amount of heat dissipated in wiring transformers and system connectio...

Страница 34: ...particularly added together in the neutral These harmonics can go from a total rms current in the transformer s neutral wire that is normally 130 of the total rms current measured in any individual ph...

Страница 35: ...to view readings press the MIN MAX pushbutton 8 To clear RECORD press the MIN MAX pushbutton for 2 seconds 6 3 Motors You can measure starting inrush current running current and current imbalance Inr...

Страница 36: ...lay for true rms current flow Any significant flow with balanced phases indicates the presence of harmonic currents 7 Press the Hz pushbutton to measure the frequency of neutral wire Reading indicates...

Страница 37: ...er before use for cracks or missing portions of the insulating cover or for loose or weakened components Pay particular attention to the insulation surrounding the clamp jaws and clamp lever Any Meter...

Страница 38: ...stance 0 to 4K Continuity check Beep at approx 35 in the 400 range 8 2 Specifications Accuracy is given as of reading number of least significant digits at 18 C to 28 C with relative humidity up to 80...

Страница 39: ...n DC Current Range Resolution Accuracy 0 30 to 39 99A 0 01A 2 30 dgts 0 3 to 399 9A 0 1A 400 to 700A 1A 2 10 dgts Function AC Voltage TRUE RMS DC Voltage Range Resolution Accuracy AC VOLTAGE 45Hz to 6...

Страница 40: ...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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