Model UT57: OPERATING MANUAL Table of Contents A. B. C. D. E. F. G. Your Meter’s Feature Specifications Making Measurements Maintenance Accessories Using Holster Using Strap Introduction UT57 is one type of UNI-T brand new UT50 series Multimeters with 4 1/2 digits, which has special and steady function and is a highly reliable hand -held measuring instrument.
Model UT57: OPERATING MANUAL Safety Rules l Use the Meter only as specified in this manual, otherwise the protection provided by the Meter may be impaired. l The meter is designed to withstand the stated Max. voltages. If it is not possible to exclude without doubts that impulses, transients,disturbance or for other reasons, these voltages are exceeded a suitable prescale (10:1) must be used. l Do not operate the Meter before the cabinet has been closed and screwed safely as terminal can carry voltage.
Model UT57: OPERATING MANUAL l l l l l l l l l Make sure to use new fuses with proper rating to instead of bad fuses. To avoid electric shock or damages, do not apply more than 1000V between the “COM” terminals and “ ”earth ground. Use caution when working with Voltages above 60V (DC) or 30Vrms (AC). These Voltages pose shock hazard. Replace the battery as soon as the battery indicator “ ”appears.
Model UT57: OPERATING MANUAL A. Your Meter’s Feature l 21 ranges. l Liquid Crystal Display, digit’s height is 21mm . l Overload display “l”. l Maximum display “19999”. l Full range symbol display. l Full range overload protection. l Auto-Power Off. l Operating Temperature: o o o o 0 C to 40 C (32 F to 104 F ) . l Storing Temperature: o o o o -10 C to 50 C (14 F to 122 F) . l Altitude:Operation:2000m. Storage:10000m. l Relative humidity:Max.relative humidity 80% o for temperature up to 31 C decreasing.
Model UT57: OPERATING MANUAL B. Specifications Accuracy is specified for one year after calibration,at operating temeratures 23oC 5oC,with relative humidity at<75%.Accuracy specifications take the form of: (a% readings +n digits) B-1 Direct Current Voltage (DC Voltage) B-2 Alternate Current Voltage (AC Voltage) Accuracy Range Resolution 200mV 2V 20V 200V 750V 10µV 100µV (0.8% +20) 1mV 10mV 100mV (1.
Model UT57: OPERATING MANUAL B-3 Direct Current Current (DC Current) B-4 Alternate Current Current (AC Current) 6
Model UT57: OPERATING MANUAL B-5 Resistance Range Resolution 200Ω 2KΩ 20KΩ 200KΩ 2MΩ 20MΩ Accuracy 0.01Ω 0.1Ω 1Ω 10Ω 100Ω 1KΩ (0.1% +5) (0.1% +2) (0.3% +10) Overload protection: All ranges are 230VDC or AC RMS. Voltaeg at Open Circuit: About 3V Caution: At 200Ω range, short the test lead first to obtain the resistance value of the test leads. Deduct the resistance value from the measured reading to obtain the correct value of the object being measured .
Model UT57: OPERATING MANUAL 2-7 Frequency Range Resolution 20kHz 1Hz 200kHz 10Hz Accuracy (1.0% +20) Input sensitivity: 200mV rms, Max Input Scope: 30V rms. Overload protection: 230V rms 2-8 Diode and Continuity Beeper Range Remark Measuring Condition Forward DC Current abt 1mA, Backward DC Voltage abt2.8V Display Diode Forward Voltage Value, unit is "V" Beeper sounds when Resistance < 30Ω. Voltage at open Circuit Display the nearest abt 3.
Model UT57: OPERATING MANUAL C. Making Measurements Caution (1) If there is no display or “ ” is shown on the LCD when the Meter is switched on, replace the battery ASAP. (2) Never exceed the maximum input voltage or current limits shown besides the input jacks “ ” , otherwise the Meter's internal circuit will be damaged and this is dangerous to life. (3) Become familiar with all buttons,and Turn the rotary switch to proper range before operating.
Model UT57: OPERATING MANUAL C-1 Measuring DC Voltage 1) / Button should not be pressed down and LCD should not display “AC” Symbol. 2) Connect the black test lead to “COM” jack and red test lead to “ V ” jack. 3) Set the rotary switch to “ V ” 4) Connect the test leads across with the object to be measured. LCD appears the measuring value and also the polarity of the red test leads.
Model UT57: OPERATING MANUAL 2) Connect the black test lead to “COM” jack and red test lead to “V” jack. 3) Set the rotary switch to “V ” 4) Connect the test leads across with the object to be measured. Caution 1) Refer to “DC Voltage Caution” 1, 2, 4 2) “ ” means never exceed the maximum input limits, 750V, otherwise internal circuit of the Meter will be damaged even thought it is still possible to display higher voltage value.
Model UT57: OPERATING MANUAL 2) If “1” is shown on the LCD, it means the Meter is overloaded, then set the measuring range to higher. 3) “ ” means the maximum input current is 200mA, overload will cause the burn of fuse. 10A range has 10A/250V fuse protection C-4 Measuring AC Current 1) Press down / button to display “AC “on LCD. If + / button has not been pressed down, it means the measuring value is the sum of Direct and Alternate Current ( + ).
Model UT57: OPERATING MANUAL C-5 Measuring Resistance 1) Connect the black test lead to “COM” jack and red test lead “Ω”jack. 2) Set rotary switch to “Ω” 3) Connect the test leads across with the object to be measured. Caution 1) If “1” is shown on the LCD, which means the Meter is overloaded, then set a higher measuring range.
Model UT57: OPERATING MANUAL C-7 Measuring Frequency 1) Connect red test lead to “Hz” jack and black test lead to “COM” jack. 2) Set the rotary switch to “kHz” 3) Connect the test leads across with the object being measured. LCD appears the frequency value. Caution When measuring above 30Vrms, accuracy could not be guaranteed and take extra care of safety as voltage brings dangerous electricity .
Model UT57: OPERATING MANUAL C-10 Auto-Power Off function 1) The Meter equips with auto-power off function. It will be in a sleep mode when it has been oprated for 30 minutes. Power will be automatically cut off. 2) Press the on/off switch two times to power up again. D Maintenance The Meter is a highly precise electrical testing instrument, do not attempt to change the circuit of your Meter .
Model UT57: OPERATING MANUAL F. Using Holster Three different ways to use holster: 1) Set holster parallel on the table, do not open the tilt stand (see diagram 1) 2) Set holster in a small angle on the table, tilt it up by the first part of tilt stand (see diagram 2) 3) Set holster in a large angle on the table, tilt it up by all two parts of tilt stand (see diagram 2). figure1 figure2 figure3 G. Using Strap 1) Put the front end of the strap through the round metal of the Meter, see diagram 1.
Model UT57: OPERATING MANUAL Manufacturer: UNI-TREND TECHNOLOGY(DONG GUAN)LIMITED Address: Dong Fang Da Dao, Bei Shan Dong Fang Industrial Development District, Hu Men Town, Dong Guan City, Guang Dong Province, China Headquarters: Uni-Trend International Limited Address: 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.
