USER MANUAL IN PDF - Extech Instruments
Contents
1. 4d 1000V 1 2 4d Up to 20kHz 50 00mV 500 0mV 0 5dB 5 000V 50 00V 500 0V 3dB 1000V Unspecified Specified from 30 to 100 of range CMRR gt 60dB 2 DC to 60Hz Rs 1kO Input Impedance 10MQ 16pF nominal 44pF nominal for 50mV amp 500mV ranges DC CURRENT Accuracy_____ _ Burden Voltage RANGE _ __ _ 500 04A 5000A 0 15MV uA 50 00mA 500 0mA 0 2 4d 3 3mV mA 000A 10 00A 0 03V A 10A continuous 20A for 30 seconds max with a 5 minute cool down interval AC CURRENT RANGE _ Accuracy_ Burden Voltage __ 40HztodkHP o y 40Hz to 1kHz 10A continuous 20A for 30 second max with 5 minute cool down interval TEMPERATURE RANGE Accuracy S 50 C TO 1000 C 0 3 3d 58 F TO 1832 F 0 3 6d RESISTANCE RANGE Accuracy _ _ O O o 50 00MQ 1 5 5d Open Circuit Voltage lt 1 3VDC lt 3VDC for 50Q amp 5000 ranges CAPACITANCE RANGE Accuraey _ S 50 00nF 500 0nF 0 8 3d 5 000uF 1 0 3d 50 00uF 2 0 3d 500 0uF 3 5 5d 9999uF 5 0 5d Accuracies with film capacitor or better FREOUENCY ee Uu IY ACmS i i S 10Hz 20KHZ 10Hz 1kHz 10Hz 1kHz 10Hz 125kHz Accuracy 0 01 2d Accuracy Notes Accuracy is reading digits number of digits or as otherwise specified at 23 C 5 C lt 75 R H True RMS accuracies are specified from 5 to 100 of range or as otherwise specified Maximum Crest F2. Function push buttons Rotary function switch 10A input jack VHz O Cap Temp input jack COM input jack mA uA current input jack RS232 connector rear Features Analog Bargraph display Visual indication of measurement in the tradition of an analog meter pointer The bargraph consists of 52 discrete viewing segments The bargraph is useful for detecting faulty contacts identifying potentiometer gradations and viewing signal spikes True RMS vs Average Sensing AC Measurements True RMS meters can accurately measure non sinusoidal waveforms as well as distorted sine waves that contain harmonics Average Sensing is a fast accurate and cost effective method of measuring pure sine wave signals However non sinusoidal waveforms cannot accurately be measured using Average sensing techniques Backlit display The MultiLog is equipped with a backlight for viewing the LCD display in poorly lit areas Data Hold The HOLD function freezes the reading on the display for later viewing Manual and Automatic Ranging The MultiLog series multimeters are Autoranging with manual override Smart Power Auto Power Off Smart Power shuts the meter down automatically after approximately 17 minutes of inactivity Audible Beeper To disable the audible meter tones press and hold the Hz key while powering the meter Automatic Test Lead Resistance Compensation Automatically compensates for the resistance o
3. to CAT lll 1000V Terminals to COM ratings V CATEGORY III 1000 VOLTS AC amp DC AND CATEGORY IV 600 VOLTS AC amp DC A MAuA CATEGORY III AND CATEGORY IV 500 VOLTS AC AND 300 VOLTS DC Category IV safety standard for DMMs was first released in IEC61010 1 2nd Edition in year 2001 and was yet a UL published standard at the time this manual was written UL Certification Meters that bear the UL marking have been investigated by UL headguarter in the USA per UL standard UL3111 1 1st Ed to its highest CAT Ill rating and international standard IEC61010 1 Second Edition year 2001 to CAT IV rating The UL markings on the meter where applicable are marked as UL Listed Cat lll only and UL Classified to IEC61010 1 2nd Ed Cat IV E M C Meets EN61326 1997 1998 A1 EN61000 4 2 1995 and EN61000 4 3 1996 Also meets former standards EN55011 1991 and EN50082 1 1997 In an RF field of 3V m Capacitance function is not specified Other function ranges Total Accuracy Specified Accuracy 30 digits Performance gt 3V m is not specified Overload Protection WA mA Range 0 63 500V IR 200kA F fuse A Range 12 5A 500V IR 20KA F fuse V Range 1050V rms 1450V peak mV O and other 600VDC VAC rms Power Consumption 2 7mA typical Dimension 7 32 x 3 43 x 1 4 with holster 186mm x 87mm x 35 5mm Weight 15 17 oz with holster 430g Meter Description CONDO OO FWD 5000 count Liquid Crystal display
4. User s Guide EXT INSTRUMENTS MultiLog Digital MultiMeter With built in Datalogger Model ML720 i 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 Extech offers complete repair and calibration services for all of the products we sell For periodic calibrati
5. actor lt 3 1 at full scale amp lt 6 1 at half scale with frequency component within the specified frequency bandwidth for non sinusoidal waveforms Audible Continuity Measurement threshold Beeper will sound if measurement is below 200 Beeper will not sound if measurement is above 2009 Beeper may or may not sound if measurement is between 20 and 2000 Response time lt 100us Digital Display 5000 count LCD display 5 per second nominal refresh rate Bar Graph Display 52 segment bargraph 60 per second nominal refresh rate Datalogging Capacity 43000 points Datalog Sample Rate 0 05 0 2 for C F amp O 0 4 for HZ and 1 for C 1 20 40 60 120 240 amp 480 seconds Low Battery Below approx 7V Operating Temperature 32 to 113 F 0 to 45 C Storage Temperature 4 to 140 F 20 to 60 C Relative Humidity Max 80 up to 87 F 31 C decreasing linearly to 50 at 113 F 45 C lt 80 storage Altitude Operating below 2000 meters Temp Coefficient Nominal 0 15 x specified accuracy per C Beiwen 0 and 18 C or 28 to 50 C or as otherwise specified Power Supply 9V battery NEDA1604 JISOO6P or IEC6F22 AC Sensing True RMS Auto Power Off After 17 minutes of inactivity with no input signal Safety Intended for indoor use and protected by double insulation per EN61010 1 and IEC61010 1 2nd Edition 2001 to CAT Ill 1000V amp CAT IV 600V The meter also meets UL3111 1 1994 and CSA C22 2 No 1010 1 92
6. d until StoP appears in the display to stop the data logging process and store the data 15 Recalling Stored Readings To recall stored data press the START UP or DOWN arrow key momentarily to CALL the logged data The LCD will show a flashing C CALL to indicate that the data shown is logged data The data can also be transferred to a PC using the supplied Windows software and interface cable When the datalogger is paused or when the CALL mode is activated select from the following activities for datalog viewing 1 Use the arrow keys to scroll through the data on the meter s LCD display 2 Press and hold the UP or DOWN arrow keys to quickly scan the logged data The meter provides an audible tone when the first or last reading is reached 3 Press the UP and DOWN arrow keys at the same time momentarily to display alternately the MINIMUM and MAXIMUM readings 4 Press the UP or DOWN arrow key momentarily while holding the HOLD key to search all of the trends in the recorded data list The LCD will indicate MIN or MAX for each trend in the list Datalog Item Numbers Each logged reading has an item number 0 to n where n is the maximum number of records that can be stored When the logged data entries exceed 9999 the bargraph display indicates the most significant digit of the item numbers gt 10 000 For example 1 10 000 2 20 000 etc Meter Memory Full When the meter memory is full the datalogging pr
7. ead into the mA A 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 A jack 4 For current measurements up to 10A set the function switch to the A position and insert the red test lead into the A jack 5 Press the SELECT key momentarily to toggle between AC and DC 6 Remove power from the circuit under test and open the circuit at the point where you wish to 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 on the display 11 Resistance and Continuity Measurements 1i 5 6 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the V Q CAP jack Set the function switch to the Q position Press the SELECT key momentarily to select Continuity if required 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 For Resistance tests read the resistance on the display For Continuity tests If the resistance is lt 20Q an audible tone will sound Automatic test lead resistance calibration When manually entering the 50Q range using the RANGE key the automatic test lead resistance f
8. eature will prompt Shrt in the display the user to short the inputs for calibration Short the test leads for about 3 seconds until the display shows zero The resistance of the test leads is now subtracted from the reading The compensation value can be as much as 5Q Note The compensation procedure must be repeated each time the range or function is changed Capacitance Measurements 1 2 3 Insert the black lead into the negative COM jack and the red test lead into the positive CAP jack Set the function switch to the P CAP position Press the SELECT key momentarily to select the Capacitance function if reguired Touch the test leads to the capacitor to be tested and read the measured value 12 Freguency Measurements 1 2 3 Connect and make the measurement required as described in the previous paragraphs Press the Hz key to select the Frequency Hz function Read the frequency on the display Notes on sensitivity Input sensitivity varies automatically with function range selected The mV function has the highest 300mV and the 1000V range has the lowest 300V sensitivity It is recommended that the user first measure the signal voltage or current level before activating the Hz function to automatically set the most appropriate trigger level You can also press the RANGE button momentarily to select another trigger level manually If the Hz reading becomes unstable select a lower sensitiv
9. f the test leads as well as the internal protection circuitry automatically ensuring greater accuracy of low resistance measurements Datalogging The MultiLog series of multimeters store reading for review on the LCD display or downloading to a pc using the supplied software 10 Operation Measurement Considerations NOTICE Read and understand all warning and caution statements listed in the safety section of this operation manual prior to using this meter 1 Always move the rotary function switch to the OFF position when the meter is not in use This meter has Auto Power OFF that automatically shuts the meter OFF if 17 minutes elapse without activity 2 lf OL appears on the display during a measurement the measurement exceeds the range selected Change to a higher range AC DC Voltage Measurements 1 Insert the black test lead into the negative COM jack and the red test lead into the positive V jack 2 Set the function switch to the VAC VDC mV position Press the SELECT key momentarily to toggle between AC and DC 3 Read the voltage measurement on the display AC DC Current Measurements CAUTION Do not make current measurements at 20A 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 4000uA set the function switch to the uA position and insert the red test l
10. from the case bottom and stand using a Philips head screwdriver 2 Lift the end of the case bottom nearest the input jacks until it unsnaps from the case top 3 Replace the battery or blown fuse s 4 Replace the case bottom and ensure that all the gaskets are properly seated and that the two snaps on the case top near the display side are engaged 5 Re fasten the screws Fuses FS1 uA mA Range 0 5 0 63 ampere F fast acting ceramic Preferred Ferraz CO84205 0 63A Acceptable Bussmann ABC 1 2 0 5A FS2 A Range 12 ampere F fast acting ceramic Preferred Ferraz D085448 12 5A Acceptable Bussmann ABC 12 12A A fuse kit Extech P N FS880 is available that contains one each of the Ferraz fuses
11. ity to avoid electrical noise If the display is zero select a higher sensitivity Diode Test du 2 3 Insert the black lead into the negative COM jack and the red test lead into the positive jack Set the function switch to BtCAP position Press the SELECT key momentarily to select the diode function if required Touch the test probe tips to the diode or semiconductor 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 displays a value and the other reading displays OL the diode is good B If both readings display OL the device is open C If both readings are very small or 0 the device is shorted Temperature Measurements ls or BR W PP Insert the Temperature Probe into the COM and TEMP input jacks observing polarity Set the function switch to the TEMP position Use the SELECT key to toggle between C and F Touch the Temperature Probe tip to the device under test Wait 30 seconds for the measurement to stabilize then read the display 13 Smart Power Auto Power Off Smart Power shuts the meter down automatically after approximately 17 minutes of inactivity The 17 minute time period is reset any time the rotary switch is moved or as long as the signal being fed into the meter is greater than 10 of the range This
12. l indicates that under normal use hazardous voltages may be present O Double insulation Safety Precautions 1 Improper use of this meter can cause damage shock injury or death Read and understand this user s manual before operating the meter 2 Make sure any covers or battery doors are properly closed and secured 3 Always remove the test leads before replacing the battery or fuses 4 Inspect the condition of the test leads and the meter itself for any damage before operating the meter Repair or replace any damage before use 5 Do not exceed the maximum rated input limits 6 Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC These voltages are considered a shock hazard 7 Always discharge capacitors and remove power from the device under test before performing Capacitance Diode Resistance or Continuity tests 8 Remove the battery from the meter if the meter is to be stored ae long periods 9 To avoid electric shock do not measure AC current on any circuit whose voltage exceeds 500V AC 10 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 11 The product is intended only for indoor use 12 If the equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impai
13. ocess ceases automatically and the meter will enter the Auto Power OFF mode Note that while datalogging the Auto Power OFF mode is disabled Low Battery Datalogging If the 9V battery voltage falls critically low while the meter is datalogging the meter automatically ceases logging to ensure the integrity of the data recorded Non Volatile Data Storage Data are stored in non volatile memory shortly after each measurement is taken to maximize data safety However the end of data information can only be stored after a datalog event is complete Always StoP the datalogger before switching off the meter Datalogging Sampling Rate a Press the TIMER key momentarily to display the datalogger s sampling rate recording interval The factory default interval is 0 05 seconds meaning that a reading will be logged every 5 hundredths of a second Press the UP or DOWN arrow key momentarily to select an alternate sampling interval Choose from 0 05 up to 480 seconds Note that the fastest sampling interval for Temperature and Resistance readings is 0 2 seconds For Freguency it is 0 4 seconds and for Capacitance it is 1 second Press the TIMER key again to confirm the new setting The Sampling Rate cannot be changed while the meter is datalogging When a Sampling Rate of 20 seconds or longer is selected the meter enters a standby state between readings to conserve battery life While in stand by the bargraph will continue to operate To wake u
14. on NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to insure calibration integrity dma a Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Rd Waltham MA 02451 Copyright 2005 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form ML720 V3 0 2 05 2 Introduction Congratulations on your purchase of Extech model ML720 True rms datalogging digital multimeter Properly used this meter will provide many years of reliable service The MultiLog measures AC DC Voltage Current Resistance Frequency Capacitance Temperature Diode and Continuity The MultiLog offers a built in datalogger and an optical RS 232 interface The meter stores 43 000 data points in internal memory Safety International Safety Symbols This symbol adjacent to another symbol or terminal indicates the user must refer to the manual for further information A This symbol adjacent to a termina
15. p meter from a stand by state in order to view a real time measurement press the SELECT key momentarily RS232C PC computer interface capabilities This device is eguipped with an optical isolated interface port located on the rear of the meter The data acquisition package includes an interface cable and Windows data acquisition software The software provides in the format of a digital meter a analog meter a comparator meter and a graphical display Refer to the README file on the software disk for further details 17 Maintenance WARNING To avoid electrical shock disconnect the meter from any circuit remove the test leads from the input jacks and turn OFF the meter before opening the case Do not operate with open case Install only the same type of fuse or equivalent Cleaning and Storage Periodically wipe the case with a damp cloth and mild detergent do not use abrasives or solvents If the meter is not to be used for periods of longer than 60 days remove the battery and store it separately UL Listed The UL mark does not indicate that this product has been evaluated for the accuracy of its readings Battery Replacement Loosen the 2 screws from the battery access door of the case bottom Lift the battery access door and thus the battery compartment up Replace the battery Re fasten the screws Battery Standard 9V Alkaline NEDA1604 JISOO6P IEC6F22 Fuse Replacement 1 Remove the four screws
16. prevents auto powering off during long term tests To wake the meter press the SELECT key or turn the meter off and on again Audible Beeper The audible beeper can be disabled by pressing the Hz key while turning the meter on 14 Datalogging Datalogging Basics The ML720 can store up to 43 000 readings automatically These readings can be viewed on the LCD display or transferred to a PC using the PC interface cable and Windows software included Datalogging Note Each time the datalogging Strt process is initiated existing data will be erased Always review or download stored data before beginning a new recording session 1 Press the timer key to enter the sample rate mode The default setting is 0 05 seconds 2 Press the up down arrow keys to select the desired sample rate 3 Press the timer key to store the selected sample rate 4 Press and hold the ll Strt PAUS StoP key for 1 second until Strt appears in the display to start the data logging process 5 The bargraph display will appear with a single oscillating pointer to indicate the datalogging process is in progress 6 Press the Il Strt PAUS StoP key to pause datalogging A blinking H will appear in the display 7 Press ll again to continue datalogging Cont will appear momentarily in the display 8 Press the SELECT key to toggle between the measured value display and the data list item number display 9 Press and hold the II key for 1 secon
17. red 13 Pollution degree 2 PER IEC 1010 OVERVOLTAGE INSTALLATION CATEGORY OVERVOLTAGE CATEGORY I Equipment of OVERVOLTAGE CATEGORY is equipment for connection to circuits in which measures are taken to limit the transient overvoltages to an appropriate low level Note Examples include protected electronic circuits OVERVOLTAGE CATEGORY II Equipment of OVERVOLTAGE CATEGORY ll is energy consuming equipment to be supplied from the fixed installation Note Examples include household office and laboratory appliances OVERVOLTAGE CATEGORY III Equipment of OVERVOLTAGE CATEGORY Ill is equipment in fixed installations Note Examples include switches in the fixed installation and some eguipment for industrial use with permanent connection to the fixed installation OVERVOLTAGE CATEGORY IV Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation Note Examples include electricity meters and primary over current protection eguipment Specifications DC VOLTAGE RANGE Accuracy 50 00 mV 0 12 2d 500 0 mV 0 06 2d 5 000V 50 00V 500 0V 1000V 0 08 2d NMRR gt 60dB 50 60Hz CMRR gt 120dB DC 50 60Hz Rs 1kQ Input impedance 10MQ 16pF nominal 44pF nominal for 50mV amp 500mV ranges AC VOLTAGE RANGE Accuracy 50Hz 60Hz 50 00mV 500 0mV 5 000V 50 00V 500 0V 1000V 0 5 3d 40Hz to 500Hz 50 00mV 500 0mV 0 8 3d 5 000V 50 00V 500 0V 1 0
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