Model UT51-55: OPERATING MANUAL Contents A B C D E F G Your Meters Feature Specifications Making Measurements Maintenance Accessories Using Holster Using Strap Introduction One kind of UNI-T brand new UT50 series Multimeters is a 3 1/2 digit with steady function and highly reliable hand-held measuring instrument. The Meter uses large scale of integrated circuit with double integrated A/D converter as its core and has full range overload protection.
Model UT51-55: OPERATING MANUAL Safety Rules l The UNI-T UT50 series comply with IEC 61010: in pollution degree 2, overvoltage category (CAT I 1000V and CAT II 600V) and double insulation. Use the Meter only as specified in this manual, otherwise the protection provided by the Meter may be impaired. l CAT I-For signal level, telecommunication, electronic with small transient over voltage. l CAT II -For local level, appliances, main wall outlets, portable equipment.
Model UT51-55: OPERATING MANUAL l l l l l l l l l l Make sure to use new fuses with proper rating in stead 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 UT51-55: OPERATING MANUAL A. Your Meters Feature l l l l l l l l l 32 ranges. Liquid Crystal Display, digits height is 27mm. Overload display l. Maximum display 1999 (3 1/2 digit). Full range overload protection. Auto-Power Off (For UT53, UT54 and UT55 ONLY). Temperature: o o Operating:0 C to 40 C (32 0F to 104 0F). o o Storing:-10 C to 50 C (14 0F to 122 0F ). Altitude: Operating: 2000m Storing: 10000m. Relative Humidity:Max.
Model UT51-55: OPERATING MANUAL B. Specifications Accuracy is specified for one year after calibration, o o at operating temperatures 23 C +/- 5 C, with relative humidity at < 75%.Accuracy specifications take the form of:+/- (a% readings +digits ) B-1Direct Current Voltage (DC Voltage) Range Resolution 200mV 2V 20V 200V 1000V Accuracy UT51 UT 52 UT53 UT54 UT55 100µV 1mV 10mV 100mV 1V (0.5% +1) (0.8% +2) Input impedance: All ranges are 10MΩ . Overload protection: 200mV is 250VDC or AC RMS.
Model UT51-55: OPERATING MANUAL B-3 Direct Current Current (DC Current) Range Resolution 20µA 200µA 2mA 20mA 200mA 2A 10A 20A 0.01µA 0.1 µA 1 µA 10µA 100 µA 1mA 10mA Accuracy UT51 UT 52 UT53 UT54 UT55 (2%+5) (0.8%+1) (0.8%+1) (1.5%+1 ) (1.5%+1) (2%+5) (2%+5 ) Overload protection: For UT51: 2A, 250V fast acting fuse, φ5x20mm(below 2A range) 10A, 250V fast acting fuse,φ5x20mm(at 10A range) . For UT52/53/54/55: 315mA, 250V fast acting fuse, φ5x20mm (No fuse at 20A range).
Model UT51-55: OPERATING MANUAL B-4 Alternating Current Current (AC Current) Range Resolution 200µA 2mA 20mA 200mA 2A 10A 20A 0.1µA 1µ A 10µA 100 µA 1mA 10mA Accuracy UT51 UT 52 UT53 UT54 UT55 (1.8%+3) (1%+3) (1%+3) (1.8%+3) (1.8%+3) (3%+7) (3%+7 ) Overload protection: For UT51: 2A, 250V fast acting fuse, φ5x20mm(below 2A range) 10A, 250V fast acting fuse,φ5x20mm(at 10A range) . For UT52/53/54/55: 315mA, 250V fast acting fuse,φ5x20mm (No fuse at 20A range).
Model UT51-55: OPERATING MANUAL B-5 Resistance Range Resolution 200Ω 2KΩ 20KΩ 200KΩ 2MΩ 20MΩ 200MΩ 0.1Ω 1Ω 10Ω 100Ω 1KΩ 10KΩ 100KΩ Accuracy UT51 UT 52 UT53 UT54 UT55 (0.8% +3) (0.8% +1) (1% +2) [5%(-10) +10] Voltage at open circuit: 700mV (200MΩ range, open circuit voltage around 3V) . Overload protection: All ranges 250VDC or AC RMS . Caution: At 200MΩ range, as test lead is short circuit the LCD display 10 digits is normal, deduct the 10 digits from the measured reading during measuring.
Model UT51-55: OPERATING MANUAL Input sensitivity: 100mVrms. Overload protection: 250Vrms. B-8 Temperature Range o Resolution o o -20 C to 0 C -20 C o o to 0 C to 400 C o 1000 C 400oCto o 1000 C o 1C Accuracy UT51,52,53 UT53 UT55 (5%+3) (1%+3) 2% B-9 Diode Test and Continuity Beeper Range Measuring Condition Comment Display diode forward- Forward DC current abt 1mABackward DC voltage voltage near value, abt 2.8V Unit “ mV” Voltage at open circuit abt 2.
Model UT51-55: OPERATING MANUAL C.
Model UT51-55: OPERATING MANUAL “ ” “ ” “ ” “ ” Caution “ ” “ ” “ ” “ ” Caution “ “ ” ” 11
Model UT51-55: OPERATING MANUAL “ ” “ ” “ ” “ ” Caution “ ” “ ” “ ” “ ” Caution 1) Please refer to DC Current Caution 1, 2, 3.
Model UT51-55: OPERATING MANUAL C-5 Measuring Resistance “ ” “ ” “ ” Caution “ ” “ ” C-6 Measuring Capacitance Before measuring capacitance, remember it takes time for zeroing when changing ranges. Floating reading does not effect accuracy. 1) To avoid damage of the Meter or the equipment under testing, disconnect circuit powers and discharge capacitors before measuring capacitance. 2) Connect capacitor to the capacitance jack. 3) Stabilizing reading takes some time when measuring high capacitance.
Model UT51-55: OPERATING MANUAL C-7 Measuring Frequency “ “ ” ” “ ” “ “ ” “ 14 ” ”
Model UT51-55: OPERATING MANUAL D. Maintenance I.
Model UT51-55: OPERATING MANUAL 2. Turn the Meter power OFF 3. Remove the holster from the Meter. 4. Remove rubber feet and screws from the case bottom, and separate the case bottom from the case top. 5. Remove the battery from the battery compartment. 6. Replace the battery with a new 9V battery (NEDA 1604 or 6F22 or 006P). 7. Rejoin the case bottom and case top, and install the screws and rubber feet. III.
Model UT51-55: OPERATING MANUAL UT52/53/54/55: 315mA, 250V fast acting fuse, φ 5x20mm 6. Rejoin the case bottom and the case top, and install the screw and rubber feet Replacement of fuses is seldom required. Burning of a fuse always results from the improper operation. E. Accessories 1. A book of users manual 2. A pair of test lead 3. A pair of WRN-01B bread temperature probe (for UT53 and UT55 ONLY) 4. A piece of holster (if selected) F. Using Holster Three different ways to use holster: 1.
Model UT51-55: OPERATING MANUAL G. Using Strap 1. Put the front end of the strap through the round metal of the Meter, see part 1 of the below diagram. 2. Put the bottom end of the strap through the front part and tide it up, see part 2 of the below diagram. ~ END ~ * The manual is subject to changes without separate notice.
Model UT51-55: OPERATING MANUAL 19
Model UT51-55: 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.
