Manual - UEi Automotive
Contents
1. e Be sure to insert the banana plug K type temperature bead probe with correct polarities You can also use a thermocouple probe adapter optional purchase to adapt other standard K type thermocouple probes E A ce 1000 CAT il ex oOoQQ mmn mak ne ur ETHE DM391 393 MAN Current uA mA 10A Measurement wannine Never attempt an in circuit current measurement where the open circuit potential to earth is greater than 1000V You may damage the meter or be injured if the fuse blows during such a measurement AN caution Check the meter fuses before measuring current Use the proper terminals functions and range for current measurements Never place the probes in parallel with any circuit or component when the test leads are plugged into the current terminal Current is the flow of electrons though a conductor To measure current you must open the circuit under test then place the meter in series with the circuit Ranges available in current functions are 400 0uA 4000pA 40 00mA 400 0mA 4 000A 10 00A The meter defaults at DC Press SELECT push button momentarily to select AC Measuring AC or DC Current 1 Turn off power to the circuit and discharge all high voltage capacitors 2 Insert the black lead into the COM terminal and the red lead into an input terminal appropriate for the measurement range as the following table Ranges 400 0 pA 4000 pA 400 0 pA 4000 pA 4 000 A 12. flammable liquids cleaning solvents or strong detergents as they may damage the finish impair safety or affect the reliability of the structural components Battery Fuse and Test Load Replacement Always use a fresh replacement battery of the specified size and type Immediately remove the old or weak battery from the meter and dispose of it in accordance with your local disposal regulations Batteries can leak chemicals that corrode electronic circuits If your meter is not going to be used for a month or more remove and store the battery in a place that will not allow leakage to damage other materials This meter uses a single standard 9V battery NEDA 1604 JISOO6P IEC 6F 22 a 1000V 440 mA IR 10 kA fast acting F fuse for mApA current input and a 1000V 11A IR 10 Ka fast acting F fuse for A current input AN warnine Disconnect the test leads from the circuit under test and from the meter prior to removing or installing batteries To install a new battery follow these procedures 1 Turn off the meter 2 Remove the rubber boot from the meter starting at the top 3 Place meter face down on a clean cloth 4 Remove the screws from the rear case Two machined screws fasten the bottom and two self tapping screws fasten the top 5 Separate the two halves to expose the battery 6 Remove and discard the old battery Always dispose of old batteries promptly in a manner with local disposal regulations JJ Under no circumst
3. 0 05 per khz 1 count for 5 V input Logic signals only Temperature DM393 Minimum frequency Range Resolution Accuracy 40 to 14 F 3 5 F 40 to 10 C 3 5 C 14 to 752 F 1 3 F 3 of reading 3 of reading VF 10 to 400 C 752 to 2372 F VF 400 to 1300 C rc Frequency Counter Sensitivity Minimum Sensitivity RMS Sine Wave ADH to TOKHz TOHztoZ0KHz V HA mA A gt 15 FS of AC range Not Specified Burden Voltage A mA pA Function Burden Voltage typical 400pA 150uV pA 4000A 150uV pA mA pA 40mA 3 5mV mA 400mA 3 5mV mA 10A 4A 0 03V A 10A 0 03V A Electromagnetic Compatibility EMC The meters meet EN 61326 1997 A1 1998 P 8 Glossary of Terms Average sensing RMS calibrated RMS Root Mean Square Is the term used to describe the effective or equivalent DC value of an AC signal most digital multimeters use average sensing RMS calibrated technique to measure RMS values of AC signals This technique Is to obtain the average value by rectifying and filtering the AC signal The average value Is ten scaled upward that is calibrated to read the RMS value of a sine wave in measuring pure sinusoidal waveform This technique is fast accurate and cost effective However in measuring non sinusoidal waveforms significant errors can be introduced because of different scaling factors relating average to RMS values True RMS True RMS is a term wh
4. NE WiG s M393 TRUE RMS MULTIMETER AUTO gt DH AG 4 l E oss I ee vcr c numFVA op a a am RANGE neta HzDuy HOLD SELECT Temp iij e Q e ye 1000V CAT Ill Temp A ine i 400mA S s wo FUSED CAT A 4 10A MAX FUSED 5 ab gt a FL gt am ab ab E gt z 1 800 547 5740 Fax 503 643 6322 www ueitest com email info ueitest com Introduction The DM391 393 are some of our safest industrial duty meters ever made All inputs ranges and functions protected to 1000 Volts CAT Ill Perfect for HVAC and electrical technicians whose applications require higher accuracy measurements and True RMS precision Built in temperature means one less instrument to bring to the job The DM393 has convenient access to battery and fuses without breaking calibration seals Features include All inputs ranges and functions protected to 1000 V CAT III e True RMS AC Volts and Amps Access to battery and fuses without breaking calibration e Capacitance measurement from 40 00 nF to 100 0 uF 0 5 basic DC accuracy Frequency measurement to 10 MHz 4 000 count backlit display Autoranging e Temperature from 40 to 2572 F 4 000 count backlit display Safety Notes Before using this meter read all safety information carefully In this manual the word WARNING is used to indicate conditions or actions
5. shall not be liable for loss of use of the instrument or other incidental or consequential damages expenses or economic loss or for any claim or claims for such damage expenses or economic loss A purchase receipt or other proof of original purchase date will be required before warranty repairs will be rendered Instruments out of warranty will be repaired when repairable for a service charge Return the unit postage paid and insured to 1 800 547 5740 FAX 503 643 6322 www ueitest com Email info Queitest com This warranty gives you specific legal rights You may also have other rights which vary from state to state PLEASE ye eS RECYCLE Copyright 2007 UEi DM391 393 MAN 1 07
6. the resistance range from over voltage However to prevent accidentally exceeding the protection circuit s rating and to ensure a correct measurement NEVER CONNECT THE LEADS TO A SOURCE OF VOLTAGE when the rotary switch is set to 0 or functions P 3 Diode Test AN caunow Discharge all high voltage capacitors before testing diodes Large value capacitors should be discharged through an appropriate resistance load Use the diode test to check diodes transistors silicon controlled rectifiers SCs and other semiconductor devices The test sends a current through a semiconductor junction then measures the junction s voltage drop FORWARD BIAS REVERSE BIAS h PARALLEL CONNECTION Normal forward voltage drop forward biased for a good silicon diode is between 0 4V to 0 9V A reading higher than that indicates a leaky defective diode A zero reading indicates a shorted defective diode An OL indicates an open defective Reverse the test leads connections reverse biased across the diode The display shows OL if the diode is good Any other readings indicate the diode is shorted or resistive Continuity Test The continuity function detects intermittent opens and shorts lasting as little as 1 millisecond These brief contacts cause the meter to emit a short beep This function is convenient for checking wiring connections and operdion of switches A continuous beep tone indi
7. 0 00 A To avoid blowing the meter s 440 mA fuse use the mApA terminal only if you are sure the current is less than 400 mA 3 Open the current path to be tested Touch the red probe to the more positive side of the break and touch the black probe to the more negative side of the break Reversing the leads will produce a negative reading but will not damage the meter 4 Turn on power to the circuit and read the display 5 After measuring current turn off power to the circuit and discharge at high voltage capacitors Disconnect the meter and restore the circuit to normal operation P 5 Tips for Measuring Current e When measuring a 3 phase system special attention should be taken to the phase to phase voltage which is significantly higher than the phase to earth voltage To avoid exceeding the voltage rating of the protection fuse s accidentally always consider the phase to phase voltage as the working voltage for the protection fuse s e When measuring current the meter s internal shunt resistors develop a voltage across the meter s terminals called burden voltage This voltage drop may affect precision circuit or measurements Auto Manual Range Operation Press the RANGE push button momentarily to select manual ranging in volts ohms and current measurement functions and the meter will remain in the range it was in when the LCD annunciator AUTO turns off Press the button momentarily again to step thro
8. 5 2 0 75 3 NMRR gt 60db 50 60 Hz CMRR ol gt 120db DC 50 60 Hz Rs 1kQ Common Mode Rejection Ratio Input Impedance 10 MQ 30 pF nominal 50 MQ 100 pF nominal for 400 mV range AC Voltage Resolution Accuracy 40 Hz 400 Hz DM393 DM393 0 75 3 0 7596 3 2 0 3 wow w owes rows ames CMRR ee l gt 60db DC Hz Rs 1kQ Common Mode Rejection Ratio Input Impedance 10 MQ 30 pF nominal 50 MQ 100 pF nominal for 400 mV range Accuracy for 400 Hz to 1 kHz DC Current Resolution Accuracy 400A 10009 TOPA 10 2 400mA 100pA AC Current Resolution Accuracy 40 Hz 400 Hz 400 Hz 10 kHz 1 0 5 1 0 5 1 5 5 Z 1 5 10 11 5 10 2 0 10 Resistance Range Resolution Accuracy 0 10 1 0 5 1 0 5 Open circuit voltage lt 1 3 V DC Continuity Audible threshold the beeper sounds if the measured resistance is lower than 100 and turns off when greater than about 600 Diode Test Resolution Test Current Open Circuit Voltage Typical 0 25mA lt 1 5V DC Capacitance Resolution Accuracy 2 5 10 100nF 10pF 100pF 2 5 10 DM391 393 MAN Frequency and Duty Cycle Range Resolution Accuracy _ Remark DM391 DM393 5kHz 1Hz 50kHz 10Hz 500kHz 100Hz Sensitivity 5MHz 1kHz 5Hz 1MHz gt 250mV 10MHz 10kHz 1MHz 10MHz gt 350mV 0 1 to 0 1 0 5Hz to 500kHz pulse width gt 2p sec 99 9 0 1
9. M0 10 x 10 Q impedance in parallel with the circuit This loading effect can cause measurement errors in high impedance circuits In most cases the error is negligible 0 1 or less if the circuit impedance is 10k0 or less Tips for Measuring Voltage e n 400mvV range displayed value may fluctuate while disconnecting input terminals This is normal e AC voltage measuring circuit in DM393 is of root mean square True RMS value systems so the meter can accurately measure AC voltage of non sinusoidal waveforms including harmonics caused by various non linear loads e To improve the accuracy of DC voltage measurement taken in the presence of AC voltages such as measuring the DC voltage of an amplifier in the presence of an AC signal measure the AC volt age first Note the just measured AC voltage range and select a DC voltage rage that is the same or higher than the AC voltage range This method improves the DC voltage accuracy by preventing the input protection circuits from being activated AN warnine To avoid the risk of electrical shock and instrument damage input voltages must not exceed 1000 V DC or AC RMS Do not attempt to take any unknown voltage measurement that may be in excess of 1000 V DC or AC RMS Resistance 0 gt Measurement Ohms Diode and Continuity DM391 393 MAN AN wannine To avoid damaging the meter or the equipment under test remove all power from the circuit and discharge all h
10. ances should you expose batteries to extreme heat or fire as they may expose and cause injury 7 Place a fresh 9V battery in the battery clip 8 Reassemble the meter Troubleshooting If the meter fails to operate even with the battery or fuse replacements check twice according to operating procedures as described in this manual If the meter s V input terminal was subjected to high voltage transient caused by lightning or switching surge to the system by accident or abnormal operating conditions the series fusible resistors will be blown in order to protect the user and the meter Most measuring functions through this terminal will then be open circuit In this case the series fusible resistors and the spark gaps should be replaced by qualified personnel Refer to the LIMITED WA RRA NTY amp LIMITATIONS OF LIABILITY section for obtaining warranty or repairing service pairing P 6 Specifications Safety and Compliance Maximum voltage between any 1000 V AC DC terminal and the ground Compliances Complies with CSA C22 2 No 1010 1 92 NASI ISA S82 01 94 to 1000 V overvoltage category Ill UL amp cUL standard UL 3111 1 listed CE marking certified Surge protection 8kV peak per IEC 1010 0 92 Fuse protection fro mA or pA inputs 1000 V 440mA IR 10kA FAST fuse 1000 V 11A IR TOkA FAST fuse Certifications Fuse protection for A input Physical Specifications Display Digital 4000 counts display updates 5 time
11. as a CMRR specification of gt 60db at DC to 60Hz in AC volts measurement function and gt 120db at DC 50Hz and 60Hz in DC volts measurement function Burden Voltage Burden voltage is a voltage drop across the input terminals of a current measuring device caused by internal shunt resistance Burden voltage contributes measurement error and should be as low as practical Temperature Coefficient Is a factor used to calculate the change in indication or output of an instrument with changes in temperature Uncompensated changes in temperature contribute uncertainty by an amount determined by the temperature coefficient to instrument DM391 393 MAN P 9 T 2H DM391 393 Digital Multimeter Limited Warranty The DM391 393 is warranted to be free from defects in materials and workmanship for a period of five years from the date of purchase If within the warranty period your instrument should become inoperative from such defects the unit will be repaired or replaced at UEi s option This warranty covers normal use and does not cover damage which occurs in ship ment or failure which results from alteration tampering accident misuse abuse neglect or improper maintenance Batteries and consequential damage resulting from failed batteries are not covered by warranty Any implied warranties including but not limited to implied warranties of merchantability and fitness for a particular purpose are limited to the express warranty UEi
12. cates a complete wire AN camo Using resistance and continuity function in a live circuit will produce false results and may damage the instrument In many cases the suspicious components must be disconnected from the circuit under test to obtain accurate results Frequency Hz Measurement Frequency is the number of cycles a signal completes each second The meter measures the frequency of a voltage or current signal by counting the number of times the signal crosses a threshold level each second To measure the frequency of a voltage or current signal press the Hz Duty push button momentarily while measuring volts or currents The available frequency ranges are 5Hz 50Hz 500Hz 5kHz 50kHz 500kHz 5MHz and 10MHz DM391 393 MAN Tips for Measuring Frequency e n frequency the meter is always autoranging e When disconnecting the input terminals the overload sign may be displayed or the display may unsteadily fluctuate This is typical Duty Cycle Measurement DutyCyde or Duty Factor is the percentage of time a signal is above or belowa trigger level during one cycle The duty cyde mode is optimized for measuring the ON or OFF time of logic and switching signals Systems such as electronic fuel injection systems and switching power supplies are controlled by pulses of varying width which can be checked by measuring dutygcle Press the Hz Duty push button to toggle between the Hz mode and the DutyCyde mode when
13. ich identifies a DMM that accurately responds to the effective RMS value regardless of the waveform shapes such as square sawtooth triangle pulse trains spikes and transient glitches as well as distorted waveforms with the presence of harmonics Non sinusoidal waveforms may cause e Overheated transformers generator and motors to burn out faster than normal Circuit breakers to trip prematurely e Fuses to blow e Neutrals to be overheated due to the triplen harmonics present on the neutral Bus bars and electrical panels to vibrate Crest Factor Is the ratio of the Crest instantaneous peak value to the True RMS value which is commonly used to define the dynamic range of a True DMM A pure sinusoidal waveform has a Crest Factor of 1 414 A badly distorted sinusoidal waveform normally has a much higher Crest Factor NMRR Normal Mode Rejection Ratio is the DMM s ability to reject unwanted AC noise effect which can cause inaccurate DC measurements NMRR is typically specified in terms of db decibel The meter has a NMRR specification of gt 60db at 50Hz 60Hz which means a good ability to reject the effect of AC noise in DC measurements CMRR Common Mode Rejection Ratio common mode voltage is voltage existing on both the COM and Voltage input terminals of a DMM with respect to ground CMRR is a DMM s ability to reject common mode voltage effect which can cause digit rattle or offset in voltage measurements The meter h
14. igh voltage capacitors before measuring resistance Resistance is an opposition to current flow The unit of resistance is the ohm 0 The meter measures resistance by sending a small current through the circuit Ranges available in resistance functions are 4000 00 4 000 K0 40 00 kf 400 0 K0 4 MQ and 40 MO Tips for Measuring Resistance Because the meters test current flows through all possible paths between the test prove tips the measured value of a resistor in a circuit is often different from the resistor s rated value e The test leads can add 0 10 to 0 20 of error to resistance measurements To measure the resistance of the leads touch the probe tips together and read the resistance If necessary you can press the RELA push button to automatically subtract this value e The resistance function can produce enough voltage to forward bias silicon diode or transistor junctions causing them to conduct Do not use the 40 MO range for measuring the in circuit resistance to avoid this e When measuring large resistance reading may be unstable due to environmentally induced electrical noise In this case directly connect the resistor to input terminals of the meter or shield the resistor at potential of the COM input terminal to obtain stable reading e For resistance above 1 MQ the display may take a few seconds to stabilize This is normal for high resistance readings The meter has a circuit to protect
15. s sec Operating temperature 32 to 104 F 0 to 40 C Storage temperature 4 to 140 F 20 to 60 C Temperature coefficient Nominal 0 15 x specified accuracy C 0 to 8 C or 28 to 40 C or otherwise specified Relative humidity 0 to 80 32 to 95 F Altitude Operating up to 6 500 feet en spent Specifications Battery type Single 9V battery NEDA 1604 JIS 006P ir IEC 6F 22 Battery life 250 hrs typical w backlight off DM393 S soe pele nat Shock degree Per MIL T PRE 28800 for Class II Pollution degree Electromagnetic compatibility Susceptibility commercial limits for EMC EN 50082 1 Emissions commercial limits for EN 50081 1 16x 3 6 x 6 8 inches 13 6 oz Five 5 year limited warranty DM391 393 MAN Feature Summary Backlight For clear readings in poorly lit areas Fast autoranging Meter automatically selects the best range momentarily Holds readings on display Beeper sounds Battery or fuse replaceable without voiding calibration Protective holster features Battery fuse access door High impact over molded case Electrical Specifications Accuracy is given as of reading number of digits at 64 to 82 F with relative humidity up to 80 for period of one year after calibration True RMS responding accuracies are specified from 5 to 100 of range or otherwise specified Crest Factor lt 3 1 at full scale and lt 6 1 at half scale Accuracy 0
16. ss this button to toggle between the Hz measurement mode and the Duty measurement mode when the selector switch is set at Hz Duty V pA mA and 10A Hold Press this button to turn HOLD mode ON and OFF When the HOLD mode is activated the meter beeps freezes the display and displays the D H indicator on the LCD Hold mode freezes the display for later view gt O2 Backlight Press the HOLD gt push button for two seconds to turn the backlight ON or OFF when the HOLD function is simultaneously activated with the D H symbol on the display Press the HOLD push button momentarily again to activate the backlight function only Select Press this button to toggle between the DC measurement mode and the AC measurement mode when the rotary selector switch Is set to V DM393 only UA mA and 10A Press the SELECT push button to cycle through Q or 9 measurement modes when the rotary selector switch is set to Q gt 9 P 2 Operating Instructions Voltage V or V V Measurements Voltage is the difference in electrical potential between two points The polarityof AC alternating current voltage varies over time while the polarityd DC direct current voltage is constant over time V function defaults at DC Press the SELECT push button momentarily to select AC Range available in volts function are 400mvV 4V 40V 400V and 1000V When measuring voltage the meter acts like a 10
17. that may pose physical hazards to the user The word CAUTION is used to indicate conditions or actions that may damage this instrument e Do not attempt to measure any voltage that exceeds the categorybased rating of this meter Do not attempt to use this meter if either the meter or the test leads have been damaged Turn it in for repair at a qualified repair facility Ensure meter leads are fully seated by making a quick continuity check of the leads prior to making voltage measurements Keep your fingers away from the test lead s metal probe contacts when making measurements Always grip the leads behind the finger guards molded into the probes Use a current camp adapter when measuring current that may exceed 10 amps See the accessories in UEr s full line catalog Do not open the meter to replace batteries or fuses while the probes are connected WARNING ng the specified limits of this meter is dangerous and can expose the user to serious or possibly fatal injury Voltages above 60 volts DC or 25 volts AC may constitute a serious shock hazard Always turn off power to a circuit or assembly under test before cutting unsoldering or breaking the current path Even small amounts of current can be dangerous Always disconnect the live test lead before disconnecting the common test lead from a circuit DM391 393 MAN e In the event of electrical shock ALWAYS bring the victim to the emergency room for evaluation regardless of
18. the rotary selector knob is set to Hz Duty V uA mA and 10A Capacitance Measurement Za To avoid damaging the meter or the equipment under test remove all power from the circuit and discharge all high voltage capacitors before measuring capacitance Large value capacitors should be discharged through an appropriate resistance load Use the DC voltage function to confirm that the capacitor is discharged Capacitance is the ability of a component to store an electrical charge The unity of capacitance is the farad F Most capacitors are in the nanofarad nF to microfarad uF range The available capacitance ranges are 40nF 400nF 4uF 40pF and 100pF P 4 Tips for Measuring Capacitance e n capacitance the meter is always autoranging e n 40nF range the readings are probably unstable due to environmentally induced electrical noise and floating capacity of the test leads Therefore directly connect the object to be measured to the input terminals Use RELA in this range for accurate measurement The meter will display 0 33 nF with no connectors Temperature Temp Measurements DM393 only The meter comes with temperature reading in either Centigrade or Fahrenheit preset at the factory The reading mode can be changed at the factory only The SELECT function is not available in temperature mode AN warnine DO NOT apply thermocouple to circuits exceeding 30V rms 42 4V peak or 60V DC
19. the victim s apparent recovery Electrical shock can cause an unstable heart rhythm that may need medical attention Higher voltages and currents require greater awareness of physical safety hazards Before connecting the test leads turn off power to the circuit under test set the meter to the desired function and range connect the test leads to the meter first then to the circuit under test Reapply power e If any of the following indications occur during testing turn off the power source to the circuit under test e Arcing Flame e Smoke Extreme Heat Smell of Burning Materials e Discoloration or Melting of Components AN caution Do not attempt to remove the meter leads from the circuit under test The leads the meter or the circuit under test may have degraded to the point that they no longer provide protection from the voltage and current applied If any of these erroneous readings are observed disconnect power immediately and recheck all settings and connections International Symbols A verre was T AC Alternating Current Warning or Caution DC Double Insulation Direct Current LI Protection Class II Not Applicable to Identified Model Battery Controls and Indicators NOTE Although this manual describes the operation of the DM391 and DM393 all illustrations and examples assume use of the DM393 1 Digital Display Readings are displayed on a digital 4000 count display 2 Push bu
20. tton Used for special functions and features 3 Rotary Switch Allovs you to switch between any of the functions or values indicated by the numbers icons and group outlines printed around the rotating dial 4 Input Terminal For 10A 20A for 30 seconds current measurement function 5 Input Terminal For Millii amp and Micro Amps Current measurement function 6 Common Input Terminal ground reference All measurement functions 7 Input Terminal for All Functions Except current A mA pA L IT OMI THE AMS MULTIMETER AUTO 0 DH A i sth oe AC LI l Jl l rumFVA U Rotary Switch and Push button Overview Turning the Meter On To turn the meter on turn the rotary switch from OFF to any switch setting Rotary Switch Turn the meter on by selecting any measurement function The meter presents a standard display for that function range measurement units etc Use the SELECT push button to select any rotary switch alternate function When you turn the rotary switch from one function to another a display for the new function appears Button choices made in one function do not carry over into another function Indicators OFF Turns the meter off V DM393 AC volts RMS and DC volts Press SELECT push button to choose AC or DC voltage V DM391 AC volts V DM391 DC volts Q 9 Access to resistance measurement continuity test and diode test Hz Duty Frequency measurement Dut
21. ugh the ranges Press and hold the RANGE push button for 2 seconds to resume auto ranging Note Manual ran gng feature is not available in Hz Duty CAP TEMP and 9 functions Auto Power Off The Auto Power Off feature automatically turns the meter off to extend battery life after approximately 30 minutes of no activities To turn on the meter after Auto Power Off turn the rotary switch from OFF to any function ON Maintenance Periodic Service A N waenine Repair and service of this instrument is to be performed by qualified personnel only Improper repair or service could result in physical degradation of the meter This could alter the protection from electrical shock and personal injury this meter provides to the operator Perform only those maintenance tasks that you are qualified to do These guidelines will help you attain long and reliable service from your meter e Calibrate your meter annually to ensure it meets original performance specifications e Keep your meter dry If it gets wet wipe dry immediately Liquids can degrade electronic circuits Whenever practical keep the meter away from dust and dirt that can cause premature wear Although your meter is built to withstand the rigors of daily use it can be damaged by severe impacts Use reasonable caution when using and storing the meter DM391 393 MAN Cleaning Periodically clean your meter s case using a damp cloth DO NOT use abrasive
22. y cycle is also displayed if it is toggled by the Hz Duty push button CAP Capacitance measurement Temp DM393 Temperature measurement in degrees Centigrade or Fahrenheit Changing the reading mode Is preset at the factory DM391 393 MAN pA Micro amps AC rms and micro amps DC measurements DM393 Micro amps AC and milli amps DC measurements DM391 mA Milli amps AC rms and milli amps DC measurements DM393 Milli amps AC and milli amps DC measurements DM391 A Amperes AC rms and amperes DC measurements DM393 Amperes AC and amperes DC measurements DM391 Push Buttons The buttons activate features that augment the function selected with the rotary switch Range Use the RANGE push button to manually select a range Press and hold RANGE push button for two seconds to return the meter to auto range mode The meter is in auto range mode when the AUTO indicator is on The RANGE selection function is not available in Hz Duty CAP and Temp modes The range and units are displayed on the LCD RELA Use this button to set the meter to relative A mode and make relative measurements Relative zero allows the user to offset the meter consecutive measurements with the displaying reading as the reference value Practically all displaying readings can be set as relative reference value Press the RELA push button momentarily to activate and to exit relative zero mode Hz Duty Pre
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