UNI-T UT71A, Operating Manual

Page 1: ...P N 110401103779 ...

Page 2: ...Model UT71A B C D E OPERATING MANUAL ...

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Page 4: ...npacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols Getting Acquainted Turning the Meter On Battery Considerations Automatic Power Off Automatic Backlight Off Low Battery Indication The Meter Structure Rotary Switch Functional Buttons The Meter Functions Vs Displays Selecting the Range Understanding the Display ...

Page 5: ... Introduction A Measuring Voltages B Measuring Currents C Measuring Resistance D Testing for Continuity E Testing Diodes F Measuring Capacitance G Measuring Frequency Duty Cycle H Measuring Temperature I 4 20mA loop current as readout J Power Measurement Using Stores Recall and Send Features Introduction Storing and Clearing Readings Recalling Stored Readings Using Send ...

Page 6: ...efault Setting Introduction Selecting Setup Options Maintenance A General Service B Replacing the Fuses C Replacing the Battery Specifications Safety and Compliances Physical Specifications General Specifications Feature Summary Basic Specifications Detailed Accuracy Specifications A DC Voltage B AC Voltage C DC Current D AC Current ...

Page 7: ...C D E OPERATING MANUAL 65 65 66 66 67 68 69 69 CHAPTER TITLE PAGE E Resistance F Continuity Test G Diode Test H Capacitance I Frequency J Temperature Degrees Celsius Fahrenheit K 4 20mA loop current L Power Measurement ...

Page 8: ...4 1 2 digits with steady operations Digital Multimeter UT71C D E hereafter referred to as the Meter is a 40000 counts and 4 3 4 digits with steady operations fashionable structure and auto ranging instrument They all not only can measure AC voltage and current DC voltage and current Resistance Capacitance Temperature Frequency Diodes Continuity 4 20mA Loop Max Min Relative Mode but also has Data S...

Page 9: ...damage please contact your dealer immediately 1 2 3 4 5 6 7 8 9 10 English Operating Manual Test Lead K Type nickel chromium nickel silicon Point Contact Temperature Probe It is only suitable for measuring temperature under 230 oC Alligator Clip Test Clip USB interface cable CD ROM Installation Guide Computer Interface Software Carrying Bag Power Adaptor UT71E only 9V Battery NEDA 1604 6F22 006P 1...

Page 10: ... Meter and in this Operating Manual are explained on page 9 Rules For Safe Operation Warning To avoid possible electric shock or personal injury and to avoid possible damage to the Meter or to the equipment under test adhere to the following rules Before using the Meter inspect the case Do not use the Meter if it is damaged or the case or part of the case is removed Look for cracks or missing plas...

Page 11: ...d turn off power to the circuit before connecting the Meter to the circuit Replace the battery as soon as the battery indicator appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury When servicing the Meter use only the same model number or identical electrical specifications replacement parts The internal circuit of the Meter shall n...

Page 12: ... used on the Meter and in this manual are explained in Table1 2 Table 1 2 International Electrical Symbols AC or DC DC Measurement AC Measurement Grounding Double Insulated Warning Refer to the Operating Manual Deficiency of Built In Battery Conforms to Standards of European Union ...

Page 13: ... The Meter then returns to the display for the function selected with the rotary switch all previously activated button features are discarded Automatic Backlight Off Press LIGHT button to turn the backlight on and press LIGHT again to turn it off Press EXIT to exit the feature Press LIGHT to select the backlight level low or high In Setup menu see Chapter 5 you could specify a time to automatical...

Page 14: ... batteries are low and should be replaced Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery icon appears The Meter Structure The Figure 2 1 shows the Meter structure 1 LCD Display 2 Functional Buttons 3 Rotary Switch 4 Input Terminals Figure 2 1 Meter Structure ...

Page 15: ... may also be influenced by some of the choices made in Setup Use the blue button to select any rotary switch alternate function labeled in blue letters 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 The Table 2 1 described each rotary switch position ...

Page 16: ...e measurement DC millivoltage measurement Resistance measurement Power measurement Capacitance measurement Centigrade temperature measurement None None None Toggle between AC or DC voltage measurement Frequency measurement Frequency signal duty cycle measurement None Diode test Continuity test None None Fahrenheit temperature measurement OFF V Hz mV ºC ºF l l V V l l mV UT71B C D W UT71E only UT71...

Page 17: ...easurement 400µA 4000µA AC or DC current measurement 40mA 400mA AC or DC current measurement 10A Fahrenheit temperature measurement Frequency measurement Frequency signal duty cycle measurement Toggle between AC or DC current Toggle between AC or DC current 4 20mA loop current as reading Toggle between AC or DC current mA µA A 4 20mA l l l UT71E only C F Hz ...

Page 18: ...e button e g RECALL press and hold the button for over 1 second to access this additional feature This additional feature appears right above or on the left hand side of the appropriate keys To access the second additional feature of the button e g press once the button again while the Meter has already entered the first additional feature e g RECALL The second additional feature appears on the ri...

Page 19: ...NUAL ranging In MANUAL select next input range EXIT to return to AUTO AUTO is default Testing resistance signal from calibrator When testing resistance signal from calibrator it is necessary to press this button to change the maximum display to 4000 counts but the accuracy remains unchanged Setup feature Access Setup selections the display shows SET In the Setup mode each press of SETUP button ste...

Page 20: ...alue Press EXIT to exit the Recall feature Setup feature In Setup press to select OFF at the selection of HIGH and LOW Hold feature Press HOLD to freeze the displayed value Press EXIT to release the display Peak Hold feature Press to access Peak Hold feature the primary display shows PEAK HOLD Press EXIT to exit In Setup each press to select the digit you want to edit In Recall press to enable SEN...

Page 21: ...urn the backlight on It is possible to toggle between 1st and the 2nd backlight level and Exit the feature by pressing this button After exiting the light feature it is necessary to press and hold the button for over 1 second to turn the backlight on again Press to display max min and average values Press EXIT to stop and return to current measurement mode Press to output the data AUTO mode switch...

Page 22: ...ry display shows the stored value The primary display shows the present measurement value minus the stored value Press EXIT to exit relative mode In Setup each press to increment an Option In Recall each press to recall the next stored reading In Store each press to increase a second on the storing interval Table 2 2 Functional Buttons Button Description Access Method MAXMIN SEND REL 19 SEND Press...

Page 23: ...e letters Press and hold the Button while turning on the Meter to toggle to 4000 counts for all functions It is faster when the Meter is at 4000 counts measurement mode After the Meter is resuming from Automatic Power Off or turn on and off again the Meter will back to normal measurement mode 40000 counts Table 2 2 Functional Buttons Button Description Access Method 20 SEND Press the button once a...

Page 24: ...ested resistance value The tested resistance value The tested frequency value The tested capacitance value The tested ºC value The tested ºF value The tested DCµA value No display The tested frequency value 45 00Hz 100 0kHz No display No display No display No display No display No display No display No display No display Full range 4 40 400 1000 Full range 4 40 400 1000 Full range 400 Full range 4...

Page 25: ...e The tested DC current value The tested AC current value The tested power value Data recalled is on The tested frequency value 45 00Hz 10 00kHz No display The tested frequency value 45 00Hz 10 00kHz No display The tested frequency value 45 00Hz 10 00kHz Apparent power value Full range 400 4000 Full range 40 400 Full range 400 4000 Full range 10 Full range 10 Power factor value ACµA DCmA ACmA DCA ...

Page 26: ... Display Left Secondary Display The recalled value The present measurement value minus the stored value The total number of stored value The stored value Index number no 0001 no 0100 For UT71A B C E no 0001 no 9999 For UT71D The present measurement value STO MAX MIN REL Chapter 2 Getting Acquainted Using MAX MIN ...

Page 27: ...he lowest input range possible ensuring that the reading appears with the highest available resolution If AUTO is already on press RANGE to enter MANUAL ranging in the present range You can then select the next manual range each time you press RANGE Return to autoranging by press EXIT Note that there is no MANUAL ranging on REL feature Understanding the Display Display features are shown in Figure...

Page 28: ...ading displayed Minimum reading displayed The sequence of the reading Degrees Celsius default or Fahrenheit Indicates negative reading The battery is low Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears Setup feature is on ...

Page 29: ...al of AC and DC measurements Ohm The unit of resistance k Kilohm 1 x 103 or 1000 ohms M Megaohm 1 x 106 or 1 000 000 ohms Hz Hertz The unit of frequency in cycles second kHz Kilohertz 1 x 103 or 1000 hertz MHz Megahertz 1 x 106 or 1 000 000 hertz V Volts The unit of voltage mV Millivolt 1 x 10 3 or 0 001 volts A Amperes amps The unit of current mA Milliamp 1 x 10 3 or 0 001 amperes µA Microamp 1 x...

Page 30: ... or 0 000001 farads mF Millifarad 1 x 10 3 or 0 001 farads Automatic power off feature is on Continuity test Data store is on Data recall is on The relative mode is on to display the present value minus the stored value The indicator for the lowest setup limit The indicator for the highest setup limit The Meter is in the auto range mode in which the Meter automatically selects the range with the b...

Page 31: ...ight feature is on Data hold mode is active Peak hold mode is active Diode test Frequency signal duty cycle 4 20mA loop current as reading The input value is too large for the selected range Provides an analog indication of the present input quick response Indicator of power factor Indicator of apparent power unit Indicator of power measurement l l COS VA W ...

Page 32: ...minimum reading and MIN are shown on the right secondary display The primary display shows the current measurement reading Press MAX MIN the second time the current measurement reading is shown on the left secondary display The minimum reading and MIN are shown on the right secondary display The primary display shows the maximum value Press MAX MIN the third time the current measurement reading is...

Page 33: ...ify primary functions blue letters or symbols identify alternative functions Press the BLUE button to access these alternate functions A Measuring Voltages Warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V although readings may be obtained To measure voltages set up the Meter as Figure 3 1 and do the following Figu...

Page 34: ... a ACV function is selected you can press the Yellow Button to view the AC DC True RMS value in the primary display To exit please EXIT button The BLUE button cycles among frequency and duty cycle mV V mV V Note When measuring voltage the Meter acts around a 10M and or 2 5G impedance in parallel with the circuit This loading effect can cause measurement errors in high impedance circuits In most ca...

Page 35: ...ge to the Meter or to the equipment under test check the Meter s fuses before measuring current Use proper terminals function and range for the measurement Never place the testing leads in parallel with any circuit or component when the leads are plugged into the current terminals Figure 3 2 Currents Measurement To measure AC or DC current set up the Meter as Figure 3 2 and proceed as follows ...

Page 36: ...uit then read the display AC measurement displays the True RMS value DC measurement displays the effective value of sine wave mean value response Turn off power to the circuit and discharge all high voltage capacitors Remove the Meter and restore 1 2 3 4 5 6 7 A µA mA When a ACA function is selected you can press the Yellow Button to view the AC DC True RMS value in the primary display To exit ple...

Page 37: ...d discharge all the high voltage capacitors before measuring resistance To measure resistance set up the Meter as shown in Figure 3 3 and follow the following procedure Insert the red test lead into the terminal and the black test lead into the COM terminal Set the rotary switch to press BLUE button to select measurement mode Connect the test leads across with the object being measured The measure...

Page 38: ...nuity and diode Note When measuring low resistance the test leads can add 0 1 to 0 2 of error to resistance measurement To test the leads touch the probe tips together and read the resistance of the leads If necessary you can press REL to automatically subtract this value For high resistance measurement 1M it is normal taking several seconds to obtain a stable reading In order to obtain precision ...

Page 39: ...y Test Note Open circuit voltage around 1 2V and range is 400 measurement range When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the input terminals l l ...

Page 40: ...e testing diodes Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semicondutor junction then measure the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test the diode out of a circuit set up the Meter as Figure 3 5 and proceed as follows Insert the red test lead into the terminal and t...

Page 41: ... forward voltage drop reading of 0 5V to 0 8V however the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips Connect the test leads to the proper terminals as said above to avoid error display The LCD will display OL indicating either open circuit or wrong polarity connection The unit of diode is volt V displaying the positive connection volt...

Page 42: ...harging this process will be quite slow To avoid damage to the Meter or to the equipment under test disconnect circuit power and discharge all high voltage capacitors before measuring capacitance Use the DC Voltage function to confirm that the capacitor is discharged To measure capacitance set up the Meter as shown in Figure 3 6 and proceed as follows Insert the red test lead into the terminal and...

Page 43: ...s open to subtract the residual capacitance of the Meter and leads It is recommended to use test clip to carry out measurement to reduce the effect of internal distributed capacitor 2 3 Note The LCD displays OL indicating the tested capacitor is shorted or it exceeds the maximum range Capacitors larger than 400µF take longer time The analogue bar graph shows the time left before finishing the meas...

Page 44: ...7 and do the following Insert the red test lead into the Hz terminal and the black test lead into the COM terminal Set the rotary switch to UT71A UT71B C D or UT71E and press BLUE button to select the Hz measurement mode for frequency measurement or for duty cycle measurement The BLUE button cycles among frequency and duty cycle for UT71C and UT71E Connect the test leads across with the object bei...

Page 45: ...of Input amplitude a is as follows When 10Hz 40MHz 200 mV a 30Vrms 40MHz Un specified When Hz measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the input terminals l l ...

Page 46: ...ature The Meter is default to Celsius ºC degree unit you can change units by press the BLUE button once you have selected the temperature function Insert the point contact temperature probe into the Meter as figure 10 Place the temperature probe to the object being measured The measured value shows on the display after several seconds 1 2 3 Figure 3 8 Temperature Measurement ºC ºF To measure tempe...

Page 47: ...cluded point contact temperature probe can only be used with temperature 230ºC below When temperature measurement has been completed remove the temperature probe away from the multi purpose socket and remove the multi purpose socket away from the Meter l l l 4mA the primary display shows LO l4mA the primary display shows 0 20mA the primary display shows 100 20mA the primary display shows HI l l l ...

Page 48: ...ect being measured connect to the circuit Set the rotary switch to W Insert the power adaptor to the corresponding input terminals and plug the power adaptor to the outlet Insert the object to be measured into the outlet of the power adaptor The measured value shows on the display The primary display shows the power value the left secondary display show the power factor value and right secondary d...

Page 49: ...ntinuous measurement is allowed 5A 10A only 10 seconds continuous measurement is allowed and the interval between each measurement must be greater than 15 minutes When power measurement has been completed first switch off the power then disconnect the connection between the adaptor and the outlet l l ...

Page 50: ...access the quick setting Press STORE the third time STO and no appears The left secondary display shows the index number increase one The right secondary display shows the value of the corresponding index number the primary display shows the current measurement reading If there is not set time to store the reading each press of STORE to store one reading An index number increase one The maximum nu...

Page 51: ...e SEND feature to export the data to the computer via USB The software shows the data storing time and also the data value After the data transferring is completed the SEND feature will be disabled automatically Press or button to view additional stored reading Press and hold RECALL to access quick recalling Press EXIT to exit recalling l l l l l l l Recalling Stored Readings Use the following pro...

Page 52: ...sing the procedure described in this chapter Selecting Setup Options To enter the Setup mode turn the Meter on and press and hold SETUP button for over 1 second It is recommended to change the default setting only when the Meter is at DCV measurement mode In the Setup mode each press of SETUP button steps to the next Selection Each press of or button decrement or increment an Option Each Setup Sel...

Page 53: ...it you want to edit 10 20 30 OFF 1 OFF 10 20 30 OFF OFF OFF 10 mins 1 10 Over the upper limits beeps not continuously Over the lower limits beeps not continuously 10 mins power off 20 mins power off 30 mins power off Power off feature is disabled Beeps continuously and icon lights on No beep icon flashes Backlight turn off in 10 seconds Backlight turn off in 20 seconds Backlight turn off in 30 sec...

Page 54: ...hand side Zero is in the center Zero is in the center It can only apply to DCV DCI and C F functions Analogue Bar Graph Saving Setup Options At each setup Option store your choice and exit setup by press EXIT advance to the next Option by press To exit the Setup mode without saving the present Option press Setup 0 1 2 3 4 4 2 0 2 4 ...

Page 55: ... solvents To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Turn the Meter to OFF when it is not in use Take out the battery when it is not using for a long time Do not use or store the Meter in a place of humidity high temperature explosive inflammable and strong magnetic field l l l l l Chapter 6 Maintenance This chapter provides basic...

Page 56: ...oose then take out the fuse from its bracket Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse 1 0 5A 1000V fast type fuse 6 3x32mm Fuse 2 10A 1000V fast type fuse 10 3x38mm Rejoin the case bottom and case top and install the 5 screws l l l l l B Replacing the Fuses Figure 6 1 Fuse Replacement Follow Figur...

Page 57: ...being tested before opening the case bottom Turn the rotary switch to OFF and remove all connections from the terminals Remove the screw from the battery compartment and separate the battery compartment from the case bottom Replace with a new 6F22 9V battery Rejoin the case bottom and battery compartment and reinstall the screw l l l l C Replacing the Battery Figure 6 2 Battery Replacement Follow ...

Page 58: ...inal and Grounding Certification Compliances Fused Protection for µAmA input terminal Fused Protection for A input terminal Refer to different range input protection voltage IEC 61010 CAT III 1000V CAT IV 600V overvoltage and double insulation standard 0 5A 1000V fast type fuse 6 3x32mm 10A 1000V fast type fuse 10 3x38mm ...

Page 59: ... counts on primary display updates 2 3 times second 4000 counts on two secondary displays Analog 40 segments updates 10 times second 0ºC 40ºC 32ºF 104ºF 10ºC 50ºC 14ºF 122ºF 75 0ºC 30ºCæ below 50 30ºC 40ºC 9V NEDA 1604 or 6F22 or 006P In a radio field of 1 V m below Overall Accuracy Specified Accuracy 5 of Range In a radio field of 1 V m above No assigned accuracy is specified 177 x 85 x 40mm Appr...

Page 60: ...57 Model UT71A B C D E OPERATING MANUAL General Specifications Range Polarity Overloading Battery Deficiency Auto Auto Display OL except at 4 20mA Loop range which display HI or LO Display ...

Page 61: ...r Primary 40 000 counts Left Secondary 4000 counts Right Secondary 4000 counts Bar Graph 40 segments updates 10 times second Bright backlight for clear readings in poorly lighted areas The Meter automatically selects best range Choices for AC only or AC DC readings Holds readings on display Beeper sounds for resistance readings below threshold 40 segments Measure signal on or off time in Record ma...

Page 62: ...DC Voltage 0 025 AC Voltage 0 4 0 to 10A 5 10A for 10 seconds interval 15 minutes 0 to 10A 5 10A for 10 seconds interval 15 minutes 0 to 40M UT71A B is 0 to 20M 0 to 40mF UT71A B is 0 to 20mF 0 400MHz UT71A B is 0 to 200MHz 40ºC 1000ºC 40ºF 1832ºF UT71B C Up to 100 readings for UT71C and UT71E or 9999 readings for UT71D may be saved by the user in a memory These readings may be viewed by using Rec...

Page 63: ...0 05 5 0 1 8 UT71A B 200mV 2V 20V 200V 1000V 400mV 4V 40V 400V 1000V UT71C D E Resolution UT71A UT71C D E 0 1 8 0 15 8 0 05 5 0 08 5 0 1 8 UT71B Detailed Accuracy Specifications Accuracy of reading number of least significant digits guarantee for 1 year Operating temperature 18ºC 28ºC Relative humidity 75 RH 0 01mV 0 0001V 0 001V 0 01V 0 1V ...

Page 64: ...vailable 0 0001V 0 001V 0 01V 0 1V 45Hz 1kHz 1kHz 10kHz 10kHz 100kHz 45Hz 1kHz 1kHz 10kHz 10kHz 100kHz 45Hz 1kHz 1kHz 10kHz 10kHz 100kHz 45Hz 1kHz 1kHz 5kHz 5kHz 10kHz 0 4 30 3 30 6 30 0 4 30 3 30 6 30 0 4 30 5 30 Not Specified 1 30 5 30 10 30 0 8 40 3 40 7 40 0 8 40 3 40 7 40 0 8 40 5 40 Not Specified 1 5 40 0 6 40 3 40 7 40 0 6 40 3 40 7 40 0 6 40 5 40 Not Specified 1 2 40 6 40 10 40 ...

Page 65: ...nge to 100 of range b AC crest factor can be up to 3 0 except 1000V where it is 1 5 c A residual reading of 80 digits with test leads shorted will not affect stated accuracy d When frequency is lower than 100kHz the accuracy guarantee range 10 100 e When making AC DC measurment the accuray need to add 1 35 digits of reading based on the above table ...

Page 66: ... 3x32mm 10A 1000V fast type fuse 10 3x38mm Remarks l l When the measured current is 5A continuous measurement is allowed When the measured current is between 5A 10A continuous measurement 10 seconds and interval more than 15 minutes At 10A range UT71C D E UT71C D E 200µA 2000µA 20mA 200mA 10A 0 2 20 0 8 30 0 15 20 0 7 30 UT71A B UT71B UT71A 0 01µA 0 1µA 0 001mA 0 01mA 0 001A ...

Page 67: ...arks l l Display a True rms are valid from 10 of range to 100 of range b AC crest factor can be up to 3 0 c A residual reading of 80 digits with test leads shorted will not affect stated accuracy d When frequency is lower than 100kHz the accuracy guarantee range 10 100 e When making AC DC measurment the accuray need to add 1 35 digits of reading based on the above table At 10A range a When the mea...

Page 68: ...oximate 1 2V The buzzer does not sound when the test resistance is 60 The beeper comes on continuously for open conditions that is test resistance is 40 E Resistance 0 01 0 0001k 0 001k 0 01k 0 0001M 0 001M 0 3 8 test leads short circuit value 0 3 8 0 5 20 1 40 1 5 40 1000V F Continuity Test 0 01 1000V 0 5 20 test leads short circuit value 0 5 20 1 20 1 40 1 5 40 0 4 20 test leads short circuit va...

Page 69: ... 400µF 4mF 40mF 1 0 0 0 V 1 20 capacitance value of open circuit test leads 1 20 1 2 20 5 20 Not specified Accuracy UT71C D E UT71B UT71C D E UT71A B 20nF 200nF 2µF 20µF 200µF 2mF 20mF 1 5 20 capacitance value of open circuit test leads 1 5 20 1 5 40 5 40 Not specified 1 2 20 capacitance value of open circuit test leads 1 2 20 1 2 40 1 5 40 5 40 Not specified UT71A G Diode Test 0 0001V 1000V 0 001...

Page 70: ...s When 40MHz Not specified I Frequency Range Resolution Accuracy Overload Protection 40Hz 400Hz 4kHz 40kHz 400kHz 4MHz 40MHz 400MHz 1 0 0 0 V 0 01 8 Not Specified UT71C D E UT71A B UT71C D E UT71A B 20Hz 200Hz 2kHz 20kHz 200kHz 2MHz 20MHz 200MHz 0 1 15 Not Specified 0 001Hz 0 01Hz 0 0001kHz 0 001kHz 0 01kHz 0 0001MHz 0 001MHz 0 01MHz ...

Page 71: ... 50 1 5 50 3 Degrees Celsius 0 1ºF Remarks l Included is a K Type nickel chromium nickel silicon point contact temperature probe which could only measure temperature below 230ºC If you want to measure temperature higher than 230ºC you must use the rod contact temperature probe 40ºC 40ºC 40ºC 400ºC 400ºC 1000ºC Range Resolution Accuracy Overload Protection 1 0 0 0 V Fahrenheit ...

Page 72: ...ws 0 20mA the primary display shows 100 20mA the primary display shows HI END When the readings obtained is L Power Measurement UT71E only Range Resolution Accuracy Current Overload Protection 2500W 1000V 0 1 W 10A 1000V fast type fuse 10 3x38mm Voltage Overload Protection POWER VA POWER Cos POWER 2500W 1W 2 10 1 10 2 10 Remarks Power factor input range 0 000 1 000 Voltage input impedance around 1...

Page 73: ...70 Model UT71A B C D E OPERATING MANUAL This operating manual is subject to change without notice Copyright 2005 Uni Trend Group Limited All rights reserved ...