MultiTecTM Series - Extech Instruments
Contents
1. itself for any damage before operating the meter Repair any damage before use Do not exceed the maximum rated input limits Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC These voltages are considered a shock hazard Always discharge capacitors and remove power from the device under test before performing Capacitance Diode Resistance or Continuity tests Remove the battery from the meter if the meter is to be stored for long periods To avoid electric shock do not measure AC current on any circuit whose voltage exceeds 250V AC Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the electrical contacts Other means should be used to ensure that the terminals are not live Specifications Function Ranges Accuracy DC Voltage 400 0mV 0 3 reading 5 digits V DC 4 000V 40 00V 400 0V 0 196 reading 5 digits MT330 0 3 reading 5 digits MT320 0 5 reading 5 digits MT310 1000V 0 5 reading 5 digits AC Voltage 100 0 400 0mV 1 5 reading 5 digits V AC 4 000V 40 00V 400 0V 1 0 reading 5 digits 40Hz to 1kHz Model MT330 700 0V 1 5 reading 5 digits True RMS DC Current 400 0nA 4000 40 00mA 400 0mA 1 2 reading 10 digits A DC 20 00A 2 reading 10 digits AC Current 400 0uA 4000pA 40 00mA 400 0mA 1 5 reading 10 digits 40Hz to 1k2. Hz A AC 20 00A 2 reading 10 digits Model MT330 True RMS Function Ranges Accuracy Resistance 400 00 4 000kQ 40 00kQ 400 0kO 4000kQ 0 596 reading 10 digits 40 00MQ 1 reading 5 digits Frequency 500 0mHz Not specified 5 000Hz 50 00Hz 500 0Hz 5 000kHz 50 00kHz 0 1 reading 2 digits 500 0kHz 5 000MHz 10 00MHz 250mVac peak minimum Capacitance 40 00nF 400 0nF 4 000uF 40 00uF 100 0uF 2 reading 10 digits Temp F 0 0 212 0 F 3 5 digits MT320 and 212 0 400 0 F 3 reading 5 digits MT330 only 400 0 2000 F Temp C 20 0 100 0 C 3 5 digits MT320 and 100 0 400 0 C 3 reading 5 digits MT330 only 400 0 1370 C Input Limit Specifications General Specifications Function Maximum Input VDCorV AC 1000V DC or AC Peak 10 seconds mA DC AC 400mA DC AC fused 250V 0 5A A DC AC 20A DC AC 30 seconds every 15min Fused 250V 20A Frequency 250V DC or AC peak Resistance 250V DC or AC peak 10 seconds Duty Cycle 250V DC or AC peak Duty Cycle 0 196 to 99 9 Diode Test Test voltage of 1 5V max Continuity Check Audible tone if the resistance is less than 60Q Input Impedance 10MQ VDC and VAC 100MQ in the 400mV range Display 4000 count 3 digit LCD Model MT330 with back lighting Overrange indication Polarity Low Battery Indication Power Supply LCD displ
3. User s Guide EXT INSTRUMENTS MultiTec Series Digital MultiMeters with PC Interface Models MT310 MT320 MT330 WARRANTY EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for three years from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification 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 written or oral is expressed or implied REPAIR AND CALIBRATION SERVICES a Extech offers complete repair and calibration services for all of the products we sell Tech Support For perio
4. Windows 95 98 Insert the program disk into the floppy drive drive A for example Select START and then RUN from the Windows menu Type A SETUP EXE in the OPEN box and select OK Follow the installation instructions on the screen Operation 1 SARON Connect the RS 232 cable between the meter s DB 9 connector top of meter and the PC s serial port Select the Multimeter icon in the START PROGRAM menu Select Setup from the Main Menu bar and then Com Port Choose the desired COM port Select RUN from the Main Menu bar and then START to begin displaying measurements Read the HELP screen for details on operating the software Select FILE in the Main Menu bar and then Exit to quit the program
5. ays OL Auto positive polarity Minus sign for negative polarity Battery symbol indicates low battery condition One 9V battery NEDA 1604 Fuses HA mA ranges 500mA 250V ceramic 20A range 20A 250V ceramic Operating Temperature 32 F to 104 F 0 C to 40 C Storage Temperature 4 F to 140 F 20 C to 60 C Accuracy Temperature 64 F to 82 F 18 C to 28 C Relative Humidity lt 80 RH operating lt 70 RH storage Dimensions Weight 3 5x7x1 3 88x178x33mm 0 7Ib 315g Description Meter MT330 pictured 1 33 4 Digit 4000 count Liquid Crystal Display LCD 2 Function keys 3 Rotary function switch 4 20A mA uA COM V Hz O Capacitance input jacks 5 Temperature probe input socket MT320 and MT330 only 6 RS232 PC interface connector Display 1 ONDARON AutoRange mode DC current or voltage Negative minus sign AC current or voltage Input jack status icons 20A blown fuse indicator uA mA blown fuse indicator Incorrect test lead insertion indicator active in Capacitance Hz Ohms Diode Continuity and ACV DCV modes Power warning for Ohm Cap and Diode Continuity symbol Diode symbol Low Battery symbol Relative mode indicator Range hold indicator PC interface indicator Operation Measurement Preparations and Considerations 1 ALWAYS push the power key to the OFF position when the meter is not in use This meter has Auto Power OFF that automatically s
6. dic calibration NIST certification or repair of any Extech product call customer Hotlines service for details on services available Extech recommends that calibration be performed 781 890 7440 on an annual basis to insure calibration integrity ext 200 Copyright 1999 Extech Instruments Corporation All rights reserved including the extech extech com right of reproduction in whole or in part in any form Version 1 2 4 00 Introduction Congratulations on your purchase of Extech model MT310 MT320 or MT330 digital multimeter Properly used this meter will provide many years of reliable service All models measures AC DC Voltage Current Resistance Frequency and Capacitance All models are Autoranging and include a PC Interface feature The MT320 and MT330 also measure temperature The Model MT330 is True RMS responding Safety International Safety Symbols m Refer to the manual Hazardous voltages Double insulation for further information may be present UL Listed The UL mark does not indicate that this product has been evaluated for the accuracy of its readings Safety Precautions 1 e Improper use of this meter can cause damage shock injury or death Read and understand this user manual before operating the meter Make sure any covers or battery doors are properly closed and secured Always remove the test leads before replacing the battery or fuses Inspect the condition of the test leads and the meter
7. huts the meter OFF if 30 minutes elapse without activity To recover from Auto OFF press any key Alternately press the POWER key wait three seconds and press the POWER key again 2 If OL appears on the display during a measurement the measurement exceeds the range selected Change to a higher range AC or DC Voltage Measurements Set the function switch to the V position Press the DC AC key until DC or AC appears on the LCD Insert the black test lead into the negative COM jack and the red test lead into the positive V jack Touch the test probe tips to the circuit under test Read the voltage on the display BR ow AC or 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 and or the test leads 1 Insert the black test lead into the negative COM jack 2 For current measurements up to 400044 set the function switch to the LA position and insert the red test lead into the mA pA jack 3 For current measurements up to 400mA set the function switch to the mA position and insert the red test lead into the mA pA jack 4 Forcurrent measurements up to 20A AC set the function switch to the 20A position and insert the red test lead into the 20A jack 5 Press the DC AC key until AC or DC appears on the display 6 Remove power from the circuit under test and open the circuit at the point where you wish to
8. junction you wish to test Note the meter reading Reverse the test lead polarity by reversing the red and black leads Note this reading The diode or junction can be evaluated as follows A If one reading shows a value and the other reading shows OL the diode is good B If both readings show OL the device is open C If both readings are very small or 0 the device is shorted Frequency Duty Cycle Measurements 1 o Set the function switch to the HZ position Insert the black lead into the negative COM jack and the red test lead into the positive Hz jack Touch the test probe tips to the circuit under test Read the frequency on the display Press the Hz Duty button to display duty cycle in 96 Temperature Measurements MT320 and MT330 only WARNING To avoid electric shock disconnect test leads from any source of voltage before making a temperature measurement Be sure that the thermocouple has been removed before changing to any other measurement function Set the function switch to the F or C position as desired Insert the Temperature Probe into the Temperature Socket Touch the Temperature Probe tip to the device under test 4 Wait 30 seconds for the measurement to stabilize then read the LCD Auto Manual Range The meter powers up in Auto Range mode For Manual range applications follow these steps 1 Press the RANGE key The Tue indicator will extinguish and the currently selected range will be he
9. ld 2 Press the RANGE key to step through the available ranges until you select the range desired 3 Press and hold the RANGE key for 2 seconds to exit the manual ranging mode and return to mode Data Hold 1 Press the HOLD key to freeze the display the army indicator will appear 2 Press the HOLD key to return to normal operation Relative Mode The relative measurement feature allows the user to make measurements relative to a stored reference value A reference value can be stored and measurements can be made in comparison to that value The displayed value is the difference between the reference value and the measured value 1 2 3 Perform any measurement as described in the operating instructions Press the REL button to store the present reading and the indicator will appear on the display The display will now indicate the difference between the stored value and the measured value LCD Backlight model MT330 only 1 2 3 4 Press and hold the HOLD key for approx 2 seconds the indicator will appear and the backlight will be activated Press the HOLD key momentarily to turn off the icon Press and hold the HOLD key for approx 2 seconds to turn off the backlight The a e B9 icon will appear Press the HOLD key momentarily to turn off the a e B9 icon Maintenance cover or the battery fuse door Do not operate your meter until the battery fuse do
10. measure current 7 Touch the black test probe tip to the negative side of the circuit and touch the red test probe tip to the positive side of the circuit 8 Apply power to the circuit 9 Read the current in the display Resistance and Continuity Measurements 1 Set the function switch to the OHM position 2 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive jack 3 For Continuity press the DC AC key until the symbol appears 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 resistance reading 5 For Resistance tests read the resistance on the display 6 For Continuity tests If the resistance is lt 60 ohms an audible tone sounds LCD also shows the actual resistance Capacitance Measurements 1 Set the function switch to the CAP position 2 Insert the black lead into the negative COM jack and the red test lead into the positive CAP jack 3 Touch the test leads to the capacitor to be tested and read the measured value Diode Test DA BIED Set the function switch to Pt position Press the DC AC key until the symbol appears on the display Insert the black lead into the negative COM jack and the red test lead into the positive jack Touch the test probe tips to the diode or semiconductor
11. or are in place and fastened securely Cleaning the Meter Wipe the case occasionally with a damp cloth DO NOT use chemicals cleaning solvents abrasives or detergents Replacing the Batteries 1 When the battery drops below the operating voltage the battery symbol will appear in the right hand side of the LCD display The battery should be replaced at this point 2 Remove power from the meter and disconnect the test leads from the meter Open the battery fuse door by loosening the two screws on the rear battery fuse cover using a Phillips head screwdriver Clip the battery into battery holder observing the correct polarity Place the battery into the battery fuse compartment Put the battery fuse door back in place Secure with the two screws Dispose of batteries safely e DUO m s Replacing the Fuses 1 Open the battery fuse door by loosening the two screws on the battery fuse door using a Phillips head screwdriver 2 Remove the old fuse from its holder by gently pulling it out 3 access the 20A fuse remove the third screw under the tilt stand remove the back cover and gently lift the printed circuit boards 4 Install the new fuse into the holder 5 Always use a fuse of the proper size and value 0 5A 250V fast blow for the 400mA range 20A 250V fast blow for the 20A range 6 Put the battery fuse door back in place Insert the screws and tighten securely PC Interface Installation BOME 5 Start
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