User's Guide
Digital Multimeterplus IR Thermometer
Extech 450
Patented
netzerotools.com
Extech EX450 Professional Multimeter
Extech EX450-NIST Professional MultiMeter
Page 1: ...ser s Guide Digital Multimeter plus IR Thermometer Extech 450 Patented netzerotools com netzerotools com netzerotools com Extech EX450 Professional Multimeter Extech EX450 NIST Professional MultiMeter...
Page 2: ...l for further information This symbol adjacent to a terminal indicates that under normal use hazardous voltages may be present Double insulation This WARNING symbol indicates a potentially hazardous s...
Page 3: ...ical contacts Other means should be used to ensure that the terminals are not live If the equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may b...
Page 4: ...250V fast acting fuse AAC DC 20A 250V fast acting fuse 30 seconds max every 15 minutes Resistance Diode Test Continuity 250Vrms for 15sec max Temperature 60V DC 24V AC 2 USE EXTREME CAUTION when worki...
Page 5: ...GHT button 11 Laser pointer button 12 Protective holster Note Tilt stand and battery compartment are on rear of unit Symbols and Annunciators Continuity Diode test Laser pointer Battery status Test le...
Page 6: ...and is caused by the high input sensitivity The reading will stabilize and give a proper measurement when connected to a circuit DC VOLTAGE MEASUREMENTS CAUTION Do not measure DC voltages if a motor...
Page 7: ...ircuit 5 Read the voltage in the display DC CURRENT MEASUREMENTS CAUTION Do not make current measurements on the 20A scale for longer than 30 seconds Exceeding 30 seconds may cause damage to the meter...
Page 8: ...the circuit under test then open up the circuit at the point where you wish to measure current 7 Touch the black test probe tip to the neutral side of the circuit Touch the red test probe tip to the...
Page 9: ...5 If the resistance is less than approximately 150 the audible signal will sound If the circuit is open the display will indicate OL DIODE TEST 1 Set the function switch to the green position 2 Inser...
Page 10: ...exact spot being measured 4 The area of the surface to be measured must be larger than the spot size as determined by the distance to spot size specification 5 Read the temperature in the display WARN...
Page 11: ...es the reading in the display Press the HOLD key momentarily to activate or to exit the HOLD function AUTO POWER OFF The auto off feature will turn the meter off after 15 minutes LOW BATTERY INDICATIO...
Page 12: ...g 4 digits 3 0 reading 8 digits 200V 0 1V 750V 1V 2 0 reading 6 digits 3 5 reading 8 digits DC Current 200 A 0 1 A 1 5 reading 3 digits 2000 A 1 A 20mA 0 01mA 200mA 0 1mA 2A 0 001A 2 5 reading 5 digit...
Page 13: ...open circuit voltage 1 5V DC typical Continuity Check Audible signal will sound if the resistance is less than 150 approx test current 0 7mA IR Spectral response 6 to 16 m IR Emissivity 0 95 fixed IR...
Page 14: ...s so they do not leak and damage the unit 6 IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME the batteries should be removed to prevent damage to the unit Battery Replacement 1 Remove the Philli...
Page 15: ...raight up from the connectors to gain access to the fuse holders 6 Gently remove the old fuse and install the new fuse into the holder 7 Always use a fuse of the proper size and value 0 5A 250V fast b...
