See Figure 1
Contents
1. disconnect the connection between the testing leads and the circuit under test D Measuring AC Current See Figure 4 Z warning Never attempt an in circuit current measurement where the voltage between terminals and ground is greater than 250V If the fuse burns out during measurement the Meter may be damaged or the operator himself may be hurt Use proper terminals function and range for the measurement When the testing leads are connected to the current terminals do not parallel them across any circuit The AC current ranges are 200 0UA 2 000mA 20 00mA 200 0mA and 10 00A To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert the red test lead into the AmA t or 10A terminal and the black test lead into the COM terminal 3 Set the rotary switch to an appropriate measurement position in Am range 4 Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break 5 Turn on power to the circuit The measured value shows on the display It is displayed as an RMS value of sine wave mean value response Note f the value of current to be measured is unknown use the maximum measurement position 10A and 10A terminal and reduce the range step by step until P N 110401104423X a satisfactory reading is obtained When AC current me2. or 1 000 000 ohms mV V V Volts The unit of voltage mV Millivolt 1 x 10 or 0 001 volts u 3 3 A Amperes amps The unit of current A mA A mA Milliamp 1 x 10 or 0 001 amperes uA Microamp 1x 10 or 0 000001 amperes Measurement Operation A Measuring DC Voltage See Figure 3 black Figure 3 Z Warning To avoid harm to you or damage to the Meter from electric shock please do not attempt to measure voltages higher than 1000V DC 750V AC although readings may be obtained The DC voltage ranges are 200 0mV 2 000V 20 00V 200 0V and 1000V To measure DC voltage connect the Meter as follows 1 Insert the red test lead into the VQ terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Vee 3 Connect the test leads across with the object being measured The measured value shows on the display Note If the value of voltage to be measured is unknown use the maximum measurement position 1000V and reduce the range step by step until a satisfactory reading is obtained The LCD displays 1 indicating the existing selected range is overloaded it is required to select a higher range in order to obtain a correct reading In each range the Meter has an input impedance of approx 10MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kQ
3. the error is negligible 0 1 or less When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test B Measuring AC Voltage See Figure 3 Warning To avoid harm to you or damage to the Meter from electric shock please do not attempt to measure voltages higher than 1000V DC 750V AC although readings may be obtained The AC voltage ranges are 2 000V 20 00V 200 0V and 750 0V To measure AC Voltage connect the Meter as follows 1 Insert the red test lead into the VQ gt terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in V range 3 Connect the test leads across with the object being measured The measured value shows on the display which is RMS value of sine wave mean value response Note f the value of voltage to be measured is unknown use the maximum measurement position 750V and reduce the range step by step until a satisfactory reading is obtained The LCD displays 1 indicating the existing selected range is overloaded it is required to select a higher range in order to obtain a correct reading In each range the Meter has an input impedance of approx 10MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kQ the error is negligible 0 1 or less When AC voltage
4. measurement has been completed disconnect the connection between the testing leads and the circuit under test C Measuring DC Current See Figure 4 eae TTY Figure 4 7 warning Never attempt an in circuit current measurement where the open circuit voltage between terminals and ground is greater than 250V If the fuse burns out during measurement the Meter may be damaged or the operator himself may be hurt Use proper terminals function and range for the measurement When the testing leads are connected to the current terminals do not parallel them across any circuit The DC current ranges are 200 0uA 2 000mA 20 00mA 200 0mA and 10 00A To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert the red test lead into the uAmA For 10A terminal and the black test lead into the COM terminal 3 Set the rotary switch to an appropriate measurement position in Asse range 4 Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break 5 Turn on power to the circuit The measured value shows on the display Note f the value of current to be measured is unknown use the maximum measurement position 10A and 10A terminal and reduce the range step by step until a Satisfactory reading is obtained When DC current measurement has been completed
5. Curent CR woo ooo OE Pse A Warning Refer to the Operating Manual ES C Conforms to Standards of European Union The Meter Structure See Figure 1 Figure 1 1 LCD Display 2 Hold Button 3 Rotary Switch Input Terminals 6 Power Button Rotary Switch The table below offers information about the rotary switch positions Rotary Switch Position DC voltage measurement AC voltage measurement AC current measurement range from AN 0 1pAto 10A DC current measurement range from 0 1pA to 10A Diode test A Continuity test Battery test Functional Buttons The table below offers information about the functional button operations voltage measurement fum the power on and off Press HOLD once to enter hold mode Press HOLD again to exit hold mode and the present value is shown In Hold mode J is displayed Display Symbols See Figure 2 2 l mVVQkQMQ lt INOO LELLILLI A UAmAA C nn ctt rmn gp AS Figure2 The battery is low Z 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 High voltage indicator Indicator for AC voltage or current The displayed value is the mean Indicator of connecting test leads into different input terminals Connect Terminal MQ Megaohm 1 x 10
6. UNI T UTSOA Operating Manual A im s 5 eae oe mel Emn n F 2 es all Environmental Friendly Digital Multimeter Overview This Operating Manual covers safety information related to the multimeter Please read the relevant information carefully and observe all the Warnings and Notes strictly AN warning To avoid electric shock or personal injury read the Safety Information carefully before using the Meter Model UT90A is a 2000 count digital multimeter referred to as the Meter featuring versatile functions safe stable and reliable performance It can measure DC AC voltage DC AC current resistance diode and continuity and offer a battery test It is also equipped with large LCD full icon display input connection indication overload protection etc Unpacking Inspection Open the package case and take out the Meter Check the following items carefully for any missing or damaged part Item Description iL Qy English Operating Manual Test Leads 9V Battery NEDA 1604 6F22 or 006P In the event you find any missing or damaged item please contact your dealer immediately Safety Information This Meter complies with IEC61010 Overvoltage Category CAT I11000V CAT III 600V Double Insulation Pollution Degree 2 standards CAT II Local level appliance PORTABLE EQUIPMENT etc with smaller transient overvoltages than CAT III CAT III Dist
7. asurement has been completed disconnect the connection between the testing leads and the circuit under test E Measuring Resistance See Figure 5 red black N Figure 5 AN Warning To avoid damage to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring resistance The resistance ranges are 200 00 2 000kQ 20 00kQ 200 0kQ 2 000MQand 20 00MQ To measure resistance connect the Meter as follows 1 Insert the red test lead into the V Q gt terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Q range 3 Connect the test leads across with the object being measured The measured value shows on the display Note The test leads can add 0 1Q to 0 2Q of error to the resistance measurement To obtain precision readings in low resistance that is the range of 200Q short circuit the input terminals beforehand and record the reading obtained called this reading as X X is the additional resistance from the test lead Then use the equation measured resistance value Y X precision readings of resistance When shorted resistance value is 20 50 please check for loose test leads or other reasons For high resistance gt 1MQ it normally takes several seconds to obtain a stable reading and
8. h a new 9V battery NEDA1604 6F22 or 006P 6 Rejoin the case bottom and case top and reinstall the 3 screws and the holster os k k END k k This operating manual is subject to change without notice Manufacturer Uni Trend Technology China Limited No 6 Gong Ye Bei 1st Road Songshan Lake National High Tech Industrial Development Zone Dongguan City Guangdong Province China Postal Code 523 808 Headquarters Uni Trend Group Limited Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com
9. ing the Fuses See Figure 9 Figure 9 A Warning To avoid electrical shock or arc blast or personal injury or damage to the Meter use specified fuses ONLY in accordance with the following procedure To replace the Meter s fuse 1 Turn the Meter off and remove all connections from the terminals 2 Remove the holster from the Meter 3 Remove the 3 screws from the case bottom and separate the case top from the case bottom 4 Remove the fuse by gently prying one end loose then take out the fuse from its bracket 5 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 H10A 250V fast type 6x25 mm Fuse 2 H1A 250V fast type 6x25 mm 6 Rejoin the case bottom and case top and reinstall the 3 screws and holster Replacement of the fuses is seldom required Burning of a fuse always results from improper operation C Replacing the Battery See Figure 9 4N Warana To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears To replace the Meter s battery 1 Turn the Meter power off and remove all connections from the terminals 2 Take the Meter out from the holster 3 Remove the 3 screws from the case bottom and separate the case top from the case bottom Remove the battery from the battery connector Replace wit
10. it is better to choose shorter test lead When there is no input for example in open circuit condition the Meter displays 1 When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test F Testing Diodes amp Continuity N warning To avoid possible damage to the Meter and to the device under test disconnect circuit power and discharge all high voltage capacitors before testing diodes and continuity Testing Diodes See Figure 6 red amp black Figure 6 Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semiconductor junction then measures the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test a diode out of a circuit connect the Meter as follows 1 Insert the red test lead into the VQ gt terminal and the black test lead into the COM terminal 2 Set the rotary switch to J f 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The measured value shows on the display Note In a circuit a good diode should still produce a forward voltage drop reading of 0 5V to 0 8V however the reverse voltage drop reading can vary depending on the resistance of other path
11. ithin the specified range Equipped with full icons display Relative Humidity Altitude Battery Type Electro Magnetic Manual ranging Polarity Automatically display Dimensions HxWxL 179 x 88 x 39mm Weight 380g including holster and battery ETL CE IEC EN61010 CAT II 1000V CAT III 600V Pollution degreez Certification gt CE Safety Compliances Accuracy Specification Accuracy a reading b digits guarantee for 1 year Operating temperature 18 C 28 C Relative humidity lt 75 RH Temperature coefficient 0 1 x specified accuracy 1 C A DC Voltage ei 230VAC 1000V DC or 750V AC rms continuous 0 5 2 Remark Input impedance 10MQ B AC Voltage Overload 1000V DC 0 8 5 or 750V AC rms 4 1 0 5 continuous Remarks Input impedance 10MQ Frequency response 40Hz 400Hz Display RMS value of sine wave mean value response C DC Current Protection 2mA WA 0 8 2 fast type 6x25mm Remarks At 10A Range For continuous measurement lt 10 seconds and interval time between 2 measurement greater than 15 minutes D AC Current Fuse H10A 250V fast type 6x25mm Fuse H1A 250V fast type 6x25mm Fuse H10A 250V 2 0 5 fast type 6x25mm Remarks Frequency response 40Hz 400Hz At 10A Range For continuous measurement lt 10 seconds and interval time between 2
12. measurement greater than 15 minutes Displays RMS value of sine wave mean value response E Resistance saan 2002 0 1Q 0 8 3 shorted value xo wo 20MQ 10kQ 0 8 3 230V rms 1 2 5 F Diodes amp Continuity Test Overload Protection 1mV a Remarks At Range Open circuit voltage approximate 3V At Range Open circuit voltage approximate 3V The buzzer does not sound when the resistance value is gt 100Q The circuit is disconnected The buzzer sounds continuously when the resistance value is 10Q The circuit is in good condition 230V rms Maintenance This section provides basic maintenance information including battery and fuse replacement instruction LJN T ANwamna Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration performance test and service information To avoid electrical shock or damage to the Meter do not get water inside the case A General Service Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Turn the Meter off when it is not in use and take out the battery when not used for a long time Do not store the Meter in a place of humidity high temperature explosive inflammable and strong magnetic field B Replac
13. ollows 1 Insert the red test lead into the yAmA F terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in range 3 Connect the red test lead on the anode of the battery being tested and the black test lead to the cathode in parallel 4 The measured value shows on the display Note The range of 1 5V only fits for the measurement of 1 5V Battery Inside load resistance is 38Q The range of 9V only fits for the measurement of 9V Battery Inside load resistance is 450Q General Specifications Maximum Voltage between any terminals and grounding Refer to different range input protection voltage AN Fuse Protection H1A 250V fast type 6x25mm of uA mA terminal i Protection H10A 250V fast type 6x25mm of 10A terminal Measurement Speed Updates 2 3 times second Maximum Display 1999 Temperature Operating 0 C 40 C 32 F 104 F Storage 10 C 50 C 14 F 122 F lt 75 0 Cto below 30 C lt 50 30 Cto 40 C Operating 2000m Storage 10000m One piece of 9V NEDA 1604 or 6F22 or 006P When in an RF field of 1V m total accuracy assigned accuracy 5 of the range Performance above 1V m is not specified Low Battery Indication Display Negative reading Display mm Over Range Indicalion Displayed Value gt 1999 display The safety and accuracy will only be guaranteed w
14. ribution level fixed installation with smaller transient overvoltages than CAT IV Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired In this manual a Warning identifies conditions and actions that pose hazards to the user or may damage the Meter or the equipment under test A Note identifies the information that user should pay attention to Z waming 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 plastic Pay attention to the insulation around the connectors Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter When using the test leads keep your fingers behind the finger guards Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding When the Meter working at an effective voltage over 60V in DC or 30V in AC special care should be taken for there is danger of electric shock Use the proper terminals function and range for your measurements The rotary
15. switch should be placed in the right position and no any changeover of range shall be made during measurement to prevent damage of the Meter Disconnect circuit power and discharge all high voltage capacitors before testing current resistance diodes or continuity Replace the battery as soon as the battery indicator EXappears 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 replacem ent parts with the same model number or identical electrical specifications The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing No abrasive and solvent should be used to prevent the surface of the Meter from corrosion damage and accident Turn off the Meter when it is not in use and take out the battery when not used for a long time Constantly check the battery as it may leak when it has been using for some time replace the battery as soon as leaking appears A leaking battery will damage the Meter Do not use or store the Meter in an environment of high temperature humidity explosive inflammable and strong magnetic field The performance of the Meter may deteriorate after dampened The Meter is suitable for indoor use International Electrical Symbols FF Pc rect
16. ways between the probe tips Connect the test leads to the proper terminals as said above to avoid error display The open circuit voltage is around 3V when testing diode The LCD will display 1 indicating open circuit or wrong connection The unit of diode is Volt V displaying the positive connection voltage drop value When diode testing has been completed disconnect the connection between the testing leads and the circuit under test Testing Continuity See Figure 7 Figure 7 To test for continuity connect the Meter as below 1 Insert the red test lead into the VQ gt terminal and the black test lead into the COM terminal 2 Set the rotary switch to gt A 3 Connect the test leads across with the object being measured The buzzer does not sound when the resistance value is gt 100Q The circuit is disconnected The buzzer sounds continuously when the resistance value is lt 10Q The circuit is in good condition Note The LCD displays 1 indicating the circuit being tested is open Open circuit voltage is approx 3V When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test G Battery Test See Figure 8 red Figure 8 Z warning To avoid damage to the built In fuse and the Meter measure the specified battery type and power supply only To carry out battery test connect the Meter as f
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