Extech Instruments 450, User Manual

Page 1: ...User s Guide Autoranging Multimeter plus IR Thermometer Extech 450 Patent Pending ...

Page 2: ...ided could result in death or serious injury This CAUTION symbol indicates a potentially hazardous situation which if not avoided may result damage to the product This symbol advises the user that the terminal s so marked must not be connected to a circuit point at which the voltage with respect to earth ground exceeds in this case 750 VAC or 1000VDC This symbol adjacent to one or more terminals i...

Page 3: ...n 200mV range mA AC DC 200mA 250V fast acting fuse A AC DC 20A 250V fast acting fuse 30 seconds max every 15 minutes Resistance Diode Test Continuity 250Vrms for 15sec max 2 USE EXTREME CAUTION when working with high voltages 3 DO NOT measure voltage if the voltage on the COM input jack exceeds 1000V above earth ground 4 NEVER connect the meter leads across a voltage source while the function swit...

Page 4: ...CKLIGHT 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 lead connection error µ micro 10 6 amps m milli 10 3 volts amps A Amps k kilo 10 3 ohms F Farads capacitance M mega 10 6 ohms Ω Ohms MAX Maximum hold V Volts AUTO Autoranging DC Direct current HOLD ...

Page 5: ... 1 5 reading 4 digits 3 0 reading 8 digits AC Voltage 750V 1V 2 0 reading 6 digits 3 5 reading 8 digits 200µA 0 1µA 2000µA 1µA 20mA 0 01mA 200mA 0 1mA 1 5 reading 3 digits 2A 0 001A DC Current 20A 0 01A 2 5 reading 5 digits 50 to 400Hz 400Hz to 1KHz 200µA 0 1µA 2000µA 1µA 20mA 0 01mA 200mA 0 1mA 1 8 reading 8 digits 3 0 reading 7 digits 2A 0 001A AC Current 20A 0 01A 3 0 reading 8 digits 3 5 readi...

Page 6: ...Test Test current of 0 3mA maximum open circuit voltage 1 5V DC typical Continuity Check Audible signal will sound if the resistance is less than 150Ω approx test current 0 7mA IR Spectral response 6 to 16µm IR Emissivity 0 95 fixed IR distance ratio 8 1 Input Impedance 7 5MΩ VDC VAC AC Response Average responding ACV Bandwidth 50Hz to 1kHz Display 2000 count backlit liquid crystal Overrange indic...

Page 7: ...o C Operating Humidity Max 80 up to 87ºF 31ºC decreasing linearly to 50 at 104ºF 40ºC Storage Humidity 80 Operating Altitude 7000ft 2000meters maximum Weight 0 753lb 342g includes holster Size 7 36 x 3 2 x 2 0 187 x 81 x 50mm includes holster Safety For indoor use and in accordance with the requirements for double insulation to IEC1010 1 1995 EN61010 1 1995 Overvoltage Category III 600V and Catego...

Page 8: ... is normal 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 on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the green V position 2 Press the SELECT button to indicate DC...

Page 9: ...tlet before assuming that no voltage is present CAUTION Do not measure AC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the green V position 2 Press the SELECT button to indicate AC on the display 3 Insert the black test lead banana plug into the negative COM jack Insert red test lead banana plug...

Page 10: ...ed test lead banana plug into the µA mA jack 4 For current measurements up to 20A DC set the function switch to the yellow 20A range and insert the red test lead banana plug into the 20A jack 5 Press the SELECT button to indicate DC on the display 6 Remove power from 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 t...

Page 11: ...e red test lead banana plug into the µA mA jack 4 For current measurements up to 20A AC set the function switch to the yellow 20A range and insert the red test lead banana plug into the 20A jack 5 Press the SELECT button to indicate AC on the display 6 Remove power from 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 t...

Page 12: ...on switch to the green Ω position 2 Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive Ω jack 3 Press the SELECT button to indicate Ω on the display 4 Touch the test probe tips across the circuit or part under test It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the res...

Page 13: ...you wish to check 5 If the resistance is less than approximately 150Ω 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 Ω position 2 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive V jack 3 Press the SELECT button to indicate on the display 4 Touch...

Page 14: ... spot being measured 5 The area of the surface to be measured must be larger than the spot size as determined by the distance to spot size specification 6 Read the temperature in the display 2 5cm 5cm 10cm 20cm 40cm 80cm Diameter of Spot Distance to Object WARNING Do not directly view or direct the laser pointer at an eye Low power visible lasers do not normally present a hazard but may present so...

Page 15: ...ding 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 INDICATION The icon will appear in the lower left conner of the display when the battery voltage becomes low Replace the battery when this appears WRONG CONNECTION INDICATION The icon will appear in the upper right conn...

Page 16: ...Y If it gets wet wipe it off 2 USE AND STORE THE METER IN NORMAL TEMPERATURES Temperature extremes can shorten the life of the electronic parts and distort or melt plastic parts 3 HANDLE THE METER GENTLY AND CAREFULLY Dropping it can damage the electronic parts or the case 4 KEEP THE METER CLEAN Wipe the case occasionally with a damp cloth DO NOT use chemicals cleaning solvents or detergents 5 USE...

Page 17: ...r by removing two screws B using a Phillips head screwdriver 3 Insert the battery into battery holder observing the correct polarity 4 Put the battery cover back in place Secure with the screw WARNING To avoid electric shock do not operate the meter until the battery cover is in place and fastened securely NOTE If your meter does not work properly check the fuses and battery to make sure that they...

Page 18: ...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 2A 250V fast blow for the 200mA range 20A 250V fast blow for the 20A range 8 Align the center board with the connectors and gently press into place 9 Replace and secure the rear cover battery and battery cover WARNING To avoid electr...

Page 19: ... improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether wr...