INSTRUCTION MANUAL - Calright Instruments
Contents
1. Press the MIN MAX push button for 2 seconds and then release in order to exit RECORD or HOLD and RECORD s selected This meter acknowledges with a beep sound and RECORD is no longer displayed RECORD MAX MIN AVG Fig 12 DL235 MAN Applications of Measurement Non Linear Loads True RMS current flow is very important because it directly relates to the amount of heat dissipated in wiring transformers and system connections Most ammeters in the market measure average current flow not true rms current flow even if this average current flow is displayed on a scale calibrated in rms These average sensing ammeters are accurate only for a pure sign wave current All current waveforms are virtually distorted in some way The most common is harmonic distortion caused by non linear loads such as household electrical appliances personal computers or speed controls for motor drives Harmonic distortion caused significant current flow at frequencies that are at odd multiples of the power line frequency Harmonic current flow gives a substantial impact on the neutral wires of star wye connected power distribution systems In most countries a power distribution system uses commercial 3 phase 50 Hz 60 Hz power applied to a transformer with a delta connected primary and a star wye connected secondary The secondary generally provides 120 V AC from phase to neutral and 208 V AC from phase to pha2. 27 28 29 30 31 RMS 0 19 PA 20 HOLD SOFT 21 toe RECORD MAX MIN AVG ret i mi bo Soft Crest Select SOFT for a running 3 second average or CREST half cycle peak amperes AC DC Selects AC or DC mode Lever Opens and closes clamp jaws Record Displayed blinking when MIN MAX AVG values are being recorded Duration of RECORD is limited by battery life MIN MAX AVG Displayed in REC ORD mode by pressing MIN MAX push button GE Displayed when HOL D push button has been pressed 9 Displayed when push button has been pressed Soft Displayed when current flow readings or Hz or V readings are softened out over 3 second intervals KOVHZ Displayed when measuring ohms or voltage or frequency Peak Displayed when current flow readings are in half cycle peak amperes CREST mode RMS Displayed when current reading is in amperes rms Off Scale Arrow Displayed when bar graph pointer is off sale Dual Displayed when measuring frequency in digital and amperes in bar graph simultaneously A Displayed when meter is measuring amperes Digital Display Displays 3999 counts with two decimal points relative to the two ranges But displays 9999 counts in frequency mode Display in updated 4 times each second Pointers Displayed to indicate position on bar graph scale Positions are updated 20 times each second Analog Display Polarit
3. The error is usually 0 1 to 0 2 ohms for a standard pair of test leads When measuring resistance be sure that the contact between the probes and the circuit under test is good Dirt oil solder flux or other foreign matter seriously affect resistance T Fig 7 Continuity Testing Press the push button to enable the continuity testing mode This meter defaults in the coh an and then highest bar graph scale shows 400 The digital display reads OFL Fig 8 Continuity testing verifies that circuit connections are intact Test resistances below 350 cause the meter to emit a continuous tone Table 1 Beeper Response in Continuity Test Input Range Beeper On If 4000 Approx lt 350 The continuity mode is extremely fast and can be used to detect either shorts or opens that last for as little as 100 milliseconds When a change is detected the beeper tone is stretched to last at least 1 4 second so you can hear it and detect both shorts and opens This can be a valuable troubleshooting aid when looking for intermittent associated with cables connections switches relays etc If the test value is very close to the threshold erratic beeps can also occur due to environmental electrical noise EMI TT Fig 8 Using Soft Observe that SOFT is displayed after pressing the SOFT CREST push button once This SOFT mode digitally displays a running average of readings over 3 second interval
4. 82 VDE 0411 Approx 1 21 Ib 545g Size 1 73 H x 3 84 W x 9 65 L 4 39 cm H x 9 75 cm W x 24 5 cm L DL235 MAN P 10 J f DL235 True RMS Clamp On Multimeter Limited Warranty The DL235 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 shipment 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 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 warra ntywill 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 ueitest com This warranty
5. for example from voltage to amperes Fig 11 In the AC amperes mode the bar graph displays the rms value of current flow and also blinking pointers at the recorded MIN and MAX But in the frequency mode the bar graph displays the rms value of current flow only No blinking pointers In SOFT the softened values of rms current flow frequency or voltage is recorded for MIN MAX and AVG The bar graph displays instantaneous values of rms current with blinking pointers In CREST that is PEAK mode the half cycle peak amperes are recorded for MAX In CREST mode MIN and AVG are not available The bar graph displays a single blinking pointer for MAX The CREST that s PEAK function is not available in the other V or Hz or 0 modes P 5 To stop recording use the HOLD push button Then RECORD no longer blinks and the values of MIN MAX and AVG are frozen Press the HOLD push button again to restart recording when the values of MIN MAX and AVG are not reset The recording simply starts again from where it left off Press and hold the MIN MAX push button for 2 seconds and then release in oder to exit RECORD This meter acknowledges with a beep sound and RECORD is no longer displayed RECORD EEEE 1 Fig 11 Using Record After enabling RECORD press the MIN MAX push button to cycle through the MIN MAX and AVG readings held in m
6. the equipment being tested and seek assistance or advice when performing Features include unfamiliar tasks True RMS e Keep your fingers away from the test lead metal probe contacts and bus bars when making measurements Always grip the e Soft mode reduces fluctuations in am instrument and test leads behind the hand guards molded into e Crest mode will display 1 2 wave peak MIN MAX record the probes W e 3 3 4 digit 4000 count LCD display e In the event of electrical shock ALWAYS bring the victim to the emergency room for evaluation regardless of the victim s e Auto or manual ranging e Data hold apparent recovery Electrical shock can cause an unstable heart e Low battery indication rhythm that may need medical attention e Auto power off e Ruggedized to withstand a 10 drop International Symbols Safety Notes vi A men Before using this meter read all safety information carefully In ay AC this manual the word WARNING is used to indicate conditions Alternating Current A Warning or Caution yi actions en may pose physical hazards to the user hs word oc E Double Insulation CAUTION is used to indicate conditions or actions that may Direct Current Protection Class I damage this instrument Not Applicable to Identified Model SI WARNING Exceeding the specified limits of this meter is dangerous and can expose the user to serious or possibly fatal injury e DO NOT attempt to measure an
7. 00 to 700A 7 30Hz 45Hz 65Hz 1KHz 20Hz 3OHZ 0 30 to 399 9A 400A Scale 400A Scale 7 Not Specified 1 Sine wave measured with conductor centered at alignment marks and battery life indication greater than 40 hours on meter power up 2 RMS MIN MAX ADD 10 counts 3 1A and above 30Hz 45Hz 4 AVG only 2 5A and above RMS MIN MAX Add 2 of reading kola Instantaneous Amperes Crest Mode Resolution Accuracy 3 30 dgts 4 30 dgts 4 30 dgts 8 40 dgts 3 3 dgts 0 4 to 399 9A 2A 4 3 dgts 400A Scale 4 3 dgts 4 4 dgts 45Hz 65HZ 30Hz 45Hz 65Hz 1KHZ 20Hz 30Hz 45Hz 65HZ 30Hz 45Hz 30Hz 45KHZ 20Hz 30Hz 45Hz 65HZ 30Hz 45Hz 65Hz 1KHZ 20Hz 30Hz 45Hz 65HZ 30Hz 45Hz 65Hz 1KHZ 20Hz 30Hz 0 4 to 39 99A 40A Scale 400 to 599A 400A Scale 600 to 999A 400A Scale 1 Same as 1 2 Same as 3 3 7 5A and above DL235 MAN FEET Frequency Range Resolution Accuracy 0 5 to 999 9 Hz 0 2 3 dgts 1000 to 9999 Hz 0 2 3 dgts 1 Same as 1 With current autorange Trigger Level 5 Hz to 1500 Hz 0 7A RMS or more 1 2 peak current With manual ranging Trigger Threshold 10 Hz to 1000 Hz 40A Range 6A RMS or more will trigger 400A Range 40A RMS or more will trigger DC Current Resolution Accuracy 0 30 to 39 99A 0 01A 2 30 dgts 0 3
8. a 60 Hz system 8 To freeze the digital display press the HOLD push button 9 To measure half cycle peak amperes press the SOFT CREST push button twice PEAK displayed A crest factor other than 1 414 Is an indication of harmonic current flow 10 To record readings and to view minimum maximum and average values press the MIN MAX push button 11 To clear RECORD press the MIN MAX push button for 2 seconds Adjustable Speed Motor Controllers You can measure input current output current and frequency of the adjustable speed motor controllers The output current frequency is used to calculate the rotating speed of the motor while input current frequency is used to measure the frequency of the power line The frequency of the output current is important because the voltage frequency is often meaningless for the calculations of motor controller speed 1 Press the ON OFF push button to turn on the meter 2 Clamp around an input or output phase as required and run motor at desired speed Be sure the clamp jaws are securely closed or measurements will not be accurate 3 Observe the display for True RMS current flow 4 Measure an output phase of the motor controller and use Hz mode to measure frequency Nominal motor speed is calculated from RPM 120 F P where F is the frequency measured and P is the number of motor poles 5 To record readings and to view readings press
9. a Eg INSTRUCTION MANUAL WA hom CD aj a gt Ban m T m B n SA CO a gt Lo MAX CREST DC l di 1 800 547 5740 Fax 503 643 6322 www ueitest com email infoQueitest com Introduction e Always disconnect the live test lead before disconnecting the common test lead from a circuit e When measuring high voltage disconnect the power source before The DL235 combines the speed and versatility of a high resolution analog making test lead connections Connect the test leads to the meter display with the precision of a digital meter This meter measures the True RMS value of Alternating Current AC over from 0 3A to 700A AC first then to the circuit under test Reapply power measurements are from 10 Hz to 1 KHz and frequency measurements are e If any of the following indications occur during testing turn from 0 5 Hz to 10 KHz off the power source to the circuit under test e Arcing Clamp meters that measure average current flow are inaccurate for e Flame non linear currents and their measurements may have some differences e Smoke from those obtained using this meter e Extreme Heat e Smell of Burning Materials The DL235 can also measure frequency while measuring current flow e Discoloration or Melting of Components simultaneously AC and DC voltages and resistances can be measured and also continuity check is possible with this meter e Read the safety precautions associated with
10. age ranges presents an input impedance of approximately 10 M in parallel with less than 100 pF Measurement errors due to circuit loading can result when making either AC or DC voltage measurement on circuits with high source impedance In most cases the error is negligible 0 1 or less if the measurement circuit source impedance is 10 Kilohms or less Fig 6 Measuring Resistance Press the Q push button to enable the resistance measurement mode This meter defaults in the autoranging mode and displays KQ and AUTO And also the off scale arrow of the bar graph blinks and the digital display reads OFL Fig 7 AUTO autoranging is applied to the bar graph This meter measures resistance by comparing the internal reference resistance given by a resistor array with the unknown resistance to be measured Remember the resistance displayed by this meter is the total resistance through all possible paths between the probes This explains why in circuit measurement of resistors does not often yield the ohms value indicated by the resistor s color code N canon Turn off power on the test circuit and discharge all capacitors before attempting in circuit resistance measurements If an external voltage is present across a component it will be impossible to take an accurate measurement of the resistance of that component P 4 The resistance in the test leads can diminish accuracy on the lowest 400 ohm range
11. anced current may be caused by a voltage imbalance or a shorted motor winding Repeat steps 1 thru 3 then press the MIN MAX push button to enable RECORD Turn on the motor When the motor gets to the desired speed note the blinking upper bar on the bar graph inrush RMS current and the displayed level running RMS current To view the maximum inrush current press the MIN MAX push button once Repeat step 6 if necessary To clear RECORD press the MIN MAX push button for 2 seconds Fig 13 Distribution Transformers You can measure excessive current load balance between phases True RMS and frequency of neutral current True RMS measurement yields the effective value 1 Press the ON OFF push button to turn on the meter 2 Clamp around the phase wire of the transformer Be sure the clamp jaws are securely closed or measurements will not be accurate 3 Observe the display for True RMS current flow 4 Repeat your measurement for each phase to observe balance Unbalanced phases cause large neutral currents flow 5 Clamp around the neutral wire 6 Observe the display for True RMS current flow Any significant flow with balanced phases indicates the presence of harmonic currents 7 Press the Hz push button to measure the frequency of neutral wire Reading indicates the frequency of the dominant current flow in case of harmonic current flow 180 Hz reading in
12. e bar scale and the digital display Press the RANGE push button to select a fixed scale instead of autoranging Observe that each press alternates between the 40A and 400A scales and AUTO is no longer displayed When the reading is beyond the limits of the digital display for example 40A on a 40A scale OFL appears on the digital display Press the RANGE push button for 2 seconds and then release in order to return to autoranging mode This meter acknowledges with a beep sound and displays AUTO Fig 2 Fig 2 Measuring DC Amperes Press the AC DC push button to select the DC amperes measurement mode AC disappears on the LCD but the meter is still in the autoranging mode AUTO displayed unless you press the RANGE push button to enter into the manual ranging mode When the DC amperes measurement mode is entered the display reads a non zero DC amperes positive or negative value due to the presence of the Earth s magnetism This value is variable according to the location measuring DC amperes Fig 3 Fig 3 P 3 Zero Adjustment by the Microprocessor To initiate the zero adjustment procedure press the HOLD push button for 2 seconds Then th meter beeps and the display reads zero just after the microprocessor memorized the right preceding display value that is used for calculating the exact DC amperes measurement value when measuring the DC amperes of a current ca r rying conduc
13. e 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 A anmi 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 Place meter face down on a clean cloth Remove the screws from the rear case Separate the two halves to expose the battery mo FSF ON N Remove and discard the old battery Always dispose of old battenes promptly in a manner with local disposal regulations P 8 Annan Under no circumstances 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 Specifications Accuracy is given as of reading number of least significant digits at 18 C to 28 C with relative humidity up to 80 for a period of one year after calibration AC Current RMS Amperes Resolution Accuracy 3 20 dgts 45Hz 65Hz 0 30 to 39 99A 4 30 dgts 30Hz 45Hz 40A Scale 4 30 dgts 65Hz 1KHZ 8 30 dgts 20Hz 30Hz 3 2 dgts 45Hz 65Hz 4 3 dgts 30Hz 45HZ 4 3 dgts 65Hz 1KHZ 8 3 dgts 20Hz 3OHZ 5 45Hz 65Hz 4
14. emory If this meter is in CREST that is PEAK function only MAX is held in memory Battery life limits the duration of RECORD The MAX reading is the maximum value detected since RECORD started The MIN reading is the minimum value detected since RECORD started The AVG reading is calculated continuously from the start of RECORD Fig 12 To stop recording and to freeze the values of MIN MAX and AVG in memory press the HOLD push button Press the MIN MAX push button to cycle through the readings including a position where the ID blinks In this mode readings may be taken without disturbing the values held in memory To restart recording press the HOLD push button Then RECORD blinks When using HOLD and RECORD Note that when RECORD is blinking this meter is recording values when RECORD is not blinking this meter is not recording values When EKTA is blinking the digital display is showing a real measurement when EEJ is not blinking the digital display is showing a recorded measurement HOLD and RECORD apply to the digital display only The bar graph shows a real measurement only at all times If you press the MIN MAX push button to start recording while in the HOLD mode RECORD s not blinking because this meter is not recording values And if you cycle through the MIN MAX and AVG readings this meter displays just
15. gives you specific legal rights You may also have other rights which vary from State to state PLEASE he RECYCLE Copyright 2007 UEi DL235 MAN 1 07
16. is normally 130 of the total rms current measured in any individual phase whose theoretical maximum is 173 For example phase currents of 80 amperes may cause harmonic current flow in the neutral of 104 amperes The dominant current flow in the neutral is most commonly the 3rd harmonic P 6 The electrical system designer must consider the following 3 issues when he designs a power distribution system containing harmonic current flow 1 The AC neutral wires must be of sufficient gauge to allow for harmonic current flow The distribution transformer must have additional cooling to continue operation at its rated capacity if it is not harmonic rated This is because the harmonic current flow in the secondary neutral wire is circulating in the delta connected primary winding after it is reflected to the primary winding The circulating harmonic current heats up the transformer Phase current harmonics are reflected to the primary winding and they continue back towards the power source This can cause distortion We can use this meter to analyze components such as power distribution transformers and power factor correction General Applications You can measure any conductor carrying AC unless this conductor is at a potential above 600 V AC or at a frequency above 10 KHz True RMS measurement yields the effective current value l 2 O Uo A WGN Press the ON OFF push button to turn on the meter Clamp around
17. or 9 push button to exit the frequency mode Fig 4 Using Data Hold To freeze the digital display reading HOLD Is not applied to the bar graph press the HOLD push button ELIT is displayed when HOLD is enabled Fig 5 When HOLD is used while measuring frequency RANGE can be changed only for imposing trigger thresholds of 6A on the 40A scale and 40A on the 400A scale The frequency reading will be 0 0 Hz when HOLD is released if the trigger threshold is not reached When in the HOLD mode this meter function can be changed from the held function to one of the other functions when HOLD is automatically released Press the HOLD push button again EEJ is no longer displayed in order to exit HOLD DL235 MAN Press the RANGE push button for 2 seconds and then release in order to autoranging mode This meter acknowledges with a beep sound and displays AUTO on the digital display LI H LI NA on 2 3 1 40 dossssssokNppokpaasaclyon Fig 5 Measuring AC DC Voltage Press the V push button to enable the voltage measurement mode and then select AC or DC by toggling the AC DC push button The meter defaults in the autoranging mode and displays V AC and AUTO AUTO autoranging is applied to the bar graph Fig 6 To measure voltage connect this meter in parallel with the load or circuit under test Each of the three AC DC volt
18. ph pointer blinks for a battery life of less than 40 hours Read the scale as 0 to 40 hours for this battery test A pointer under the 3 6 is not displayed on the scale for example represents approximately 30 hours of remaining battery life Fig 1 Release the ON OFF push button to initialize this meter Replace the battery before using this meter when the battery test gives a reading of only a few hours or when the low battery indicator is displayed on the digital display If the meter does not turn on the battery is missing or worn out Replace battery This meter shuts OFF after 10 minutes if no push button is pressed even if it is making a measurement To disable the auto power off press the ON OFF push button ex is displayed when the ON OFF pressed again the meter turns OFF To use in manual range press the RANGE push button Press again for 2 seconds to return to autoranging mode The auto power off feature is disabled in RECORD mode DL235 MAN POWER RECORD MAX MIN AVG EH son l n a AUTO LI LI KoVHZ E en A a fo RAMS 1 C pi 2 2 00 A ld ossssssso ilosososaanalfsssasssss sssasasaaigy EE A A AA AA AA AA A AAA AAA vuar Fig 1 Measuring AC Amperes When the meter is turned on it defaults in the AC amperes mode with 250 ms measurement intervals AC displayed and autoranging mode AUTO displayed which automatically selects the proper range for both th
19. se To balance the loads for each phase was a big headache for the electrical system designer historically The vector addition of the currents in the tranformer s neutral wire was zero or quite low because perfect balance was rarely achieved in a well balanced system devices connected to which were incandescent lighting small motors and other devices that presented linear loading The result was an essentially sine wave current flow in each phase and a low neutral current flow at a frequency of 50 Hz 60 Hz But devices such as TV sets fluorescent lighting video machines and microwave ovens are commonly drawing power line current for only a fraction of each cycle so that they cause non linear loading and subsequent non linear current flow This generates odd harmonics of the 50 Hz 60 Hz line frequency Therefore the current in the transformer of today contains not only a 50 Hz or 60 Hz component but a 150 Hz or 180 Hz component a 250 Hz or 300 Hz component and the other significant harmonic components up to a 750 Hz or 900 Hz component and beyond The vector addition in a properly balanced power distribution system feeding non linear loads may still be quite low But the addition does not cancel all the harmonic currents The odd multiples of the 3rd harmonic called the TRIPLENS are particularly added together in the neutral These harmonics can form a total rms current in the transformer s neutral wire that
20. the MIN MAX push button 6 To clear RECORD press the MIN MAX push button for 2 seconds DL235 MAN Maintenance Periodic Service AN manninn 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 Calibrate your meter annually to ensure it meets original performance specifications 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 Cleaning Periodically clean your meter s case using a damp cloth DO NOT use abrasive flammable liquids cleaning solvents or strong detergents as they may damage the finish impair safety or affect the reliability of the structural components Battery 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 accordanc
21. the conductor to be measured Be sure the clamp Jaws are securely closed or measurements will not be accurate Observe the display for True RMS current flow Press the Hz push button to measure frequency Press the HOLD push button to freeze the digital display if necessary To soften readings press the SOFT CREST push button once SOFT displayed or to measure half cycle peak amperes press this push button twice PEAK displayed A crest factor other than 1 414 is an indication of non linear current flow To record readings and to view readings press the MIN MAX push button To clear RECORD press the MIN MAX push button for 2 seconds DL235 MAN Motors You can measure starting inrush current running current and current imbalance Inrush current is typically 6 times the value of running current depending on the motor type Fig 13 l 2 10 Press the ON OFF push button to turn on the meter Clamp around a motor phase conductor Be sure the clamp jaws are securely closed or measurements will not be accurate While watching the bar graph turn on the motor and observe the level of inrush current In this case the bar graph ts better than the digital display because the bar graph response is faster than the digital display When the motor reaches the desired speed observe the running current Repeat your measurement for each motor phase Unbal
22. to 399 3A 2 10 dgts 400 to 700A AC Voltage True RMS DC Voltage Accuracy Resolution AC Voltage DC Voltage 45 Hz to 65 Hz 45 Hz to 1 KHz Oto39 99V 0 01V 0 to 399 9V 1 0 3 2 5 5 1 0 3 0 to 750V 1 5 5 1 5 5 AC Voltage Common Mode Rejection Ratio 80dB dc to 60Hz DC Voltage Normal Mode Rejection Ratio gt 11dB at 50Hz or 60Hz Common Mode Rejection Ratio gt 84dB at dc 50Hz or 60Hz Resistance Range Resolution Accuracy 0 to 399 90 1 0 10 0 to 3 9990 0 1 3 Continuity Check Range Continuity Beeper P 9 Technical Data Display Digital 4000 counts 3 3 4 digits Hz 9999 count updates 4 times sec Analog updates 20 times sec 41 segment bar graph Maximum conductor a 51 mm 2 00 Maximum jaw 52 mm 2 04 opening Maximum conductor 600V rms ae E O Frequency range Current measurement 40Hz to 2KHZ PN Enn ir Crest factor 45Hz to 65Hz less than 1000A peak continuous waveform 1 4 to 2 0 add 20 digits to accuracy below 100A 2 0 to 3 0 add 1 to accuracy 20 digits below 100A 3 0 to 5 0 add 2 to accuracy 20 digits below 100A Adjacent conductor 1 of current in adjacent conductor max effect Standard equipment Clamp on meter clip on holster test leads I user s manual and 9V battery installed NEDA 1604A 9V or 6LF22 9V Safety standards UL1244 IEC 348 1010 IEC 664 appropriate parts Installation Category ll CSA C22 2 No 231 ANSI ISA
23. to reduce the fluctuation of the readings The bar graph is unaffected by this SOFT function and updates 20 times each second Fig 9 SOFT function can be used for ampere readings or voltage readings Press the SOFT CREST push button twice when in the AC or DC amperes mode or once when in the voltage mode in order to exit SOFT DL235 MAN Fig 9 Using Crest Observe that PEAK is displayed after pressing the SOFT CREST push button twice PEAK is available for AC ampere readings only and can not be selected when in the other modes Fig 10 Both the digital display and bar graph measure the half cycle peak AC amperes when PEAK is display The crest factor of a waveform is the ratio of its half cycle peak amperes to its rms amperes Half Cycle Peak Amperes Crest Factor RMS Amperes The crest factor is a nominal 1 414 for linear current flow without current wave distortion Crest factors other than 1 414 indicate the presence of harmonic current flow see 6 1 non linear loads Press the SOFT CREST push button once to exit CREST Then PEAK is no longer displayed Fig 10 Enabling Record To enable RECORD press the MIN MAX push button The blinking RECORD is displayed The recording of a new maximum Is indicated by beep sounds We can use RECORD in all modes of this meter but we can not change meter modes while in RECORD
24. tor When measuring the DC amperes of a current carrying conductor the DC amperes value has a positive or negative polarity according to the direction of current carrying This value is positive when the current flows through the conductor in the forward moving direction of a right hand threaded screw And it is negative when the current flows through the conductor in the backward moving direction of a right hand threaded screw Measuring Frequency To enable the frequency measured mode press the Hz push button This meter displays Hz DUAL and AUTO Fig 4 The frequency of the current flow is displayed AUTO autoranging is applied to the bar graph which represents rms value of the current flow When in AUTO frequency measurement uses an auto trigger threshold based on one half of the peak current measurement This provides the best sensitivity and noise immunity To select a fixed 40A or 400A bar graph display AUTO is no longer displayed press the RANGE push button With a fixed 40A or 400A scale fixed trigger thresholds are imposed for frequency readings The thresholds are 6A 40A scale or 40A 400A scale The frequency display is 0 0 Hz when a trigger threshold is not reached Press the RANGE push button for 2 seconds and then release in order to return to autoranging mode This meter acknowledges with a beep sound and displays AUTO on the digital display Press the other function A or V or Q
25. y Displays or when the pointers are displayed 0 to 400A or 0 to 800A numeric reference for the bar graph EX Displayed when internal battery needs replacing P 2 33 AC Alternating current or voltage 34 mm Automatically indicate negative digital displays 35 Auto Displayed when autoranging controls bar graph scale 0 to 40A scale or 0 to 400A scale and controls position of decimal point on digital display 36 Power Lock Displayed when the AUTO POWEROFF mode of the meter has been disabled 37 Beeper Beeps for push button operation or current overload 38 OFL Overflowndication MARK Po CONDUCTOR MARK MARK HAND GUARD Position the conductor within the jaws at the intersection of the indicated marks as much as possible in order to meet this meter s accuracy specifiations If the conductor is positioned elsewhere within the jaws the maximum additional error resulted is 1 5 percent Operating Instructions Power Up Self Test Press and hold the ON OFF push button in order to power up and initiate self test Fig 1 This meter beeps and all LCD segments will turn on some segments have nothing to do with this meter as part of a self test routine Observe a bar graph pointer blinks to indicate the battery condition while still pressing the ON OFF push button The Off Scale arrow blinks for a battery life in excess of 40 hours and a corresponding bar gra
26. y voltage that exceeds 600 volts with this meter UEi offers numerous alternatives for measuring high voltage and current Voltages above 60 volts DC or 25 volts AC may constitute a serious shock hazard DO NOT attempt to use this meter if either the meter or the test leads have been damaged Send unit in for repair by a qualified repair facility Test leads must be fully inserted prior to taking measurements Always turn off power to a circuit or assembly under test before cutting un soldering or breaking the current path Even small amounts of current can be dangerous DL235 MAN P 1 PWN i Contrds and Indicators 2 16 15 e 14 m a 13 MAX chest DG MANGE r 5 UUU 12 A Hz w El si 6 11 AA VAN 7 10 Ne 8 9 Clamp Opens 2 04 inches 52 mm to enclose conductors Hold Freezes reading in digital display Display Liquid crystal display Range Selects 0 to 40A 0 to 400A or AUTO On Off Selects meters power ON or power OFF Selects continuity testing mode N Selects ohms measurement mode VO Volt ohms continuity test input terminal V Selects volts measurement mode COM Common terminal Hz Selects frequency measurement mode A Selects aperes measurement mode MIN MAX Selects REC ORD mode and displays recorded MIN MAX AVG DL235 MAN LCD Display Functional Description 18 17 36 35 34 33 32 31 30 29 22 23 24 25 26
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