Extech Instruments 470 Manual de usuario

User's Guide True RMS Multimeter plus IR Thermometer Extech 470 Patent Pending Test Equipment Depot - 800.517.8431 - 99 Washington Street

V5.0 5/04 10 DC CURRENT MEASUREMENTS CAUTION: Do not make current measurements on the 20A scale for longer than 30 seconds. Exceeding 30 seconds m

V5.0 5/04 11 AC CURRENT MEASUREMENTS CAUTION: Do not make current measurements on the 20A scale for longer than 30 seconds. Exceeding 30 seconds m

V5.0 5/04 12 RESISTANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before

V5.0 5/04 13 CONTINUITY CHECK WARNING: To avoid electric shock, never measure continuity on circuits or wires that have voltage on them. 1. Set th

V5.0 5/04 14 CONTACT TEMPERATURE MEASUREMENTS 1. Set the function switch to the black Type K ºF or ºC position. 2. Insert the Temperature Probe i

V5.0 5/04 15 NON-CONTACT TEMPERATURE MEASUREMENTS 1. Set the function switch to the red IR Non-Contact ºF or ºC position. 2. Point the meter at the

V5.0 5/04 16 CAPACITANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before

V5.0 5/04 17 AUTORANGING/MANUAL RANGE SELECTION When the meter is first turned on, it automatically goes into AutoRanging. This automatically selec

V5.0 5/04 18 DISPLAY BACKLIGHT Press and hold the HOLD key for >1 second to turn on or off the display backlight function. The backlight will au

V5.0 5/04 19 Maintenance WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the back cover or

V5.0 5/04 2 Introduction Congratulations on your purchase of the Extech 470 (part number EX470) True RMS Autoranging Multimeter plus IR Thermometer

V5.0 5/04 20 BATTERY INSTALLATION WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the batter

V5.0 5/04 21 REPLACING THE FUSES WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the fuse co

V5.0 5/04 3 OVERVOLTAGE CATEGORY III This meter meets the IEC 610-1-95 standard for OVERVOLTAGE CATEGORY III. Cat III meters are protected against

V5.0 5/04 4 Controls and Jacks 1. IR Thermometer and laser pointer 2. 4000 count LCD display 3. HOLD and Backlight button 4. SELECT button 5. F

V5.0 5/04 5 Specifications Function Range Resolution Accuracy 400mV 0.1mV ±(0.3% reading + 2 digits) 4V 0.001V 40V 0.01V 400V 0.1V ±(0.5% readin

V5.0 5/04 6 Function Range Resolution Accuracy 400Ω 0.1Ω ±(0.8% reading + 4 digits) 4kΩ 0.001kΩ ±(0.8% reading + 2 digits) 40kΩ 0.01kΩ 400kΩ 0.

V5.0 5/04 7 Diode Test Test current of 0.3mA maximum, open circuit voltage 1.5V DC typical Continuity Check Audible signal will sound if the resi

V5.0 5/04 8 Operating Instructions WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured

V5.0 5/04 9 AC VOLTAGE MEASUREMENTS WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts inside some 24