PREFACE Dear users, Thank you for selecting new UNI-T meters. In order to use this melee properly, please read through this manual carefully before you use it especially on the section of "Safely Precautions”. if you have finished reading this manual, we recommend that you properly keep this manual for reference in the future use.
Model UT181A: OPERATING MANUAL Contents L. Overvigw 28 12, Temperature— e 54 L.Unpacking 28 13. LPF 55 Hi.Rules for Safe Operation dBV. 56 V. Electrical Symbol dBm —56 MBINI S UGG s 3] 18. Maximum Value and Minimum Value w58 VILLI Display——— 37 17. Relative e e 57 Lackeys, Rotary Switch and Input T o e Ve Associations— -3 20. Recording Measured ; et 21, COMMUNICATION Measurement Operation— a3 X Maintenance and " 1. Meter a4 1. General Maintenance and 2. Meter Setting gm VOYAGER Replacing 4.
Model UT181A: OPERATING MANUAL I. Overview The Model UT181Ais a counts 4 5/6 digits, handheld auto-range true RMS intelligent Multi meter (hereinafter referred to as "the meter”). The overall circuits designed with LS! ADC as the core. The full-range overload protection circuit and unique appearance design make special electrical meter with superior performance.
ill. Rules for Safe Operation Please note the "Naming Signs and Words." Warnings indicate the conditions and actions which pose hazards {o users or may damage the meter or equipment under test. This Meter is designed to comply with the safety standards in pollution degree 2, overeager categorization 1000V, CAT IV 600V)and double insulation as well as with the IP standards for waterproof and rustproof .
Model UT181A: OPERATING MANUAL Before testing resistance, continuity, conductance, diced or capacitor, shut off the power {o the circuit and discharge all high-voltage capacitors. Before measuring the current, check the fuses of the melee. Do not measure the voltage or current higher than the allowed input values. When the range of measured values cannot be determined, set the functional range switch at the maximum-range position. battery should be promptly charged {o ensure measurement accuracy.
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Model UT181A: OPERATING MANUAL Vi .LCD Display (see Figure 2) LC Pansy s e 777 16.87 m% Figure 2 No.
Vil. Keys, Rotary Switch and Input Terminals (1 The 14 keys on the meter are used o activate the selected features of extensible rotary switch, browse menus or control the Keys meter power. The keys shown In Figure 3 are described in the following table. Kay Function & Turn on or tum off the meter power Select the sub-functions and modes related to the functions of rotary switch.
Model UT181A: OPERATING MANUAL | Measurement of frequency, duly cycle and pulse width when Measurement of Mackinac, DC and AC+DC mhA ¥ Measurement of main Ac, DC and AC+DC AR Measurement of ampere in AC, DC and AC+DC o= Battery charge (3) Input Terminals Terminal Description Input terminals for measuring the current {maximum duration is 30 seconds for 20A A overload and suspend for 10 minutes)and frequency from 0A 1010. 00A. mas A | Input terminals for measuring the current and frequency from 0A to 600mA.
Model UT181A: OPERATING MANUAL « input impedance: About 10MQ » Overload protection: 1,000V » Display: True virtual value for 10% to 100% of the range. {4) AC Current Range Resolution Accuracy Reading + Digits) 600pA | 0.014A 6000uA | 0.1pA Asama | 0.00TmA disposal) 1_:: 600mA | 0.01mA 10A 0.001A (:mz) * Display: True virtual value for 10% to 100% of the range. « Overload protection: pa Ma range: 0.
Model UT181A: OPERATING MANUAL = Display: True virtual value for 10% to 100% of the range. = Overload protection: yam A range: 0. 8A H 1000V Fuse Type © 6x32 mm 10 Range: 11A H 1000V Fuse Type ®10x38mm = Switch on for 30 seconds and suspend for 10 minutes for 20A. Not specified for over 10A. {7} Resistance Range Resolution Accuracy Tolerance:(% Reading + Digits) 6000 0.010 In REL state: 6k 0.0001k(2 60k(2 0.001k0 600k 0.01kQ 6MQ 0.0001MQ 60MQO 0.
{14) Continuity Test Mode! UT181A: OPERATING MANUAL Range = Resolution Remark Open circuit voltage is around 3V; when the buzzer selects short circuit for sound . ’” 0.010 warning, the resolution is less than 10Q. The buzzer continuously sounds, the ' resolution is greater than 500. The buzzer does not sound. When the buzzer selects open cultural for sound waning, the resolution Is greater than 80Q. The buzzer continuously sounds, the resolution Is less than 100. The buzzer does not sound.
Model UT181A: OPERATING MANUAL IX. Measurement Operation 1. Meter Power Control 1) Manually start up and shut down the meter power. When the meter is off, long’press to start the meter. When the meter is on, long press to shut it off. The meter cannot be powered off when charging. 2} Indicators for Battery Capacity The meter is powered by lithium battery. The indicators for battery capacity are in the upper right corner of display to indicate the relative conditions of battery.
Mode! UT181A: OPERATING MANUAL 5} Power Saving Mode Set the control time of automatic reduction for back light brightness and off time for display via the meter menu bar "AUTO POWER SAVE" o enter power-saving mode. Please refer to the detailed description about the meter settings. 2. Meter settings Press the function key SETUP (Menu) to set and view the relevant information on the meter. Press the cursor keys o2 to select relevant menu items of the meter as follows.
Model UT181A: OPERATING MANUAL Menu item Description Set Value Brightness Down | Control time of automatic reduction ON: 1-80 Min OFF: This function is disabled for back light brightness Display Off Off time of display ON: 1-80 Min OFF: This function is disabled Power OfF Auto power-off time ON: 1-80 Min OFF: This function is disabled Press the function key OK (Menu) fo confirm the above settings.
3. AC Voltage 1} Insert the red test lead into the V terminal and the black test lead into the COM terminal. 2) Set the rotary switch to ¥ or.¥ as shown in Figure 5. Connect the test leads to the power or load under test in parallel. 3) Directly read the measured voltage values on the display. True virtual values are displays for AC measurement. 4) Press the function key MENU (Menu) to enter one menu fem in which backs AC voltage measurement can be modified. Press the cursor keys oZe to select menu items.
Model UT181A: OPERATING MANUAL 4} Press the function key MENU (Menu) to enter one menu item in which basic DC voltage measurement can be modified. Press the cursor keys =2 1o select menu items. The red cursor key indicates the selected item, then press Fi to enter the corresponding measuring mode, press F2 1o enter relative value measurement, and press F4 fo dose the window of additional function.
Figure 7 the connection between the test leads and the circuit under @ After completing all the measuring operations, disconnect test.
Model UT181A: OPERATING MANUAL 6. Resistance 1} Insert the red test lead into the £3 terminal and the black test lead into the COM terminal. 2) Set the rotary switch to the measurement 8% . and current {2 is the default resistance measurement as shown in Figure 8. Connect the test leads to both ends of the measured resistance. 3) Directly read the measured resistance values on the display.
7. Conductance 1} insert the red fest lead into the €) terminal and the black test lead into the COM terminal. 2) Set the rotary switch to the measurement gs-» . press the key SELECT to select conductance measurement 50nS. Connect the test leads to both ends of the measured resistance as shown in Figure 8. 3) Directly read the measured conductance value on the display.
Model UT181A: OPERATING MANUAL Figure 9 9. Continuity test 1) Insert the red test lead into the ) terminal and the black test lead into the COM terminal. 2} Set the rotary switch to the measurement @08 3, press the key SELECT lo select the continuity test -« . Connect the test leads to both ends of the measured resistance as shown in Figure 8. Press the function key MENU (Menu) to enter the menu items.
3) Press the function key MENU(Menu) to enter menu stems. If pressing the key ALARM, the buzzer starts up. It will beep briefly for the normal semiconductor junction; If the semiconductor junction shorts out, it will esp continuously. Silicon PN junction drops between as the normal value. If pressing the key NORMAL, the buzzer will not start up. A Attention: @ If the measured diode is in open circuit or the polarity is reversed, "OL” will display.
Model UT181A: OPERATING MANUAL 11. Frequency/Duty Cycle Measurement /Pulse Width 1) Insert the red test lead into the V terminal and the black test lead into the COM terminal. 2) Set the rotary switch to the measurement Hz% ms-Guise, press the key SELECT fo select Hz or Duty% or ms-Pulse. Connect the test leads to the signal source under test in parallel as shown in Figure 11. 3) Directly read the measured values of frequency or duty cycle or pulse width on the display.
A Attention: @ The ambient temperature for the meter shall not exceed the range from otherwise it will cause measurement errors. The measurement effects are more obvious at low temperatures. @ Remove the temperature probes after completing all the measuring operations. @ Point contact K type (chrome-silicel) thermonuclear (only applicable to the measurement when temperature is below 230 ° C). Figure 12 55 Mode! UT181A: OPERATING MANUAL 13.
Model UT181A: OPERATING MANUAL @ In the LPF measuring mode, the meter will turn 1o manual mode. Press the key RANGE to select a range. When the low-pass fighter is enabled, the automatic range is unavailable. ® Do not input a voltage above 1000V. Higher voltage may be measured but it poses the risk of damaging the meter. @ After completing all the measuring operations, disconnect the connection between the test leads and the quilter under test. 14.
17. Relative value Press the function key MENU (Menu) to enter a next interface, press the function key REL (Menu) to enter the measuring mode of relative values, then press the function key REL (Menu) o activate the measurement of relative values, by this time the measurements _ basic values are primarily displayed and the relative values and real-time measurements are secondly displayed. Press the function key MENU (Menu) to select basic measurement to exit the measurement of relative values. 18.
Model UT181A: OPERATING MANUAL After completing the settings, press the function key START (Menu) to start the measurement of compare mode. Press the function key EXIT (Menu) to exit the measurement of compare mode. 20.Recording Measurement Data Press the function key SAVE(Menu) o enter the modes of single recording, continuous recording and inquire recording. Press the cursor keys eZo to select the following modes.
@ Max Duration Indicates the maximum time for continuous recording After completing the selling, press the function key START (Menu) to start a continuous recording as shown in Figure 13. The character REC shows on the display and flashes with red dot. The relevant display information is shown in the following table.
5} View Record Model UT181A: OPERATING MANUAL Press the function key(Menu) to view the information on record events as shown in Figure 14. The basic display information is in the following table.
Press the function key PERV (Menu) fo display basic information on the previous record. Press the function key NEXT (Menu) to display basic information on the next record. Press the function key RETURN (Menu) fo return fo the previous menu. Press the function key TREND (Menu) to view the fend chart of present record as shown in Figure 15. The display information of trend data is in the following table: 7. S. 6000 4. 2000 2. 8000 1. 4000 0. 8000 0. 00:08:02 00.
Model UT181A: OPERATING MANUAL 21.Communication Figure 16 USR Communication Bluetooth Communication (optional) Turn on communication via selling (see detailed operations in the meter settings). The symbol will appear in the upper left comer on the display as shown in Figure 16. The meter carries on USB communication with USB cable {standard accessory) connecting 1o PC. The meter can use Bluetooth module (optional) and mobile phone for eyetooth communication. X. Maintenance and Repair 1.
inserted too deeply in the terminal of current input. Draw out the test lead a little until the error message disappears and OL (overload) or resistance reading appears on the display. If the resistance reading for A terminal is less than 0.50102, it shows that the fuse F2 is normal. If the reading is 0L, you need to replace F2; If the resistance reading less than 1.2MQ, it shows that the fuse F1 is normal. If the reading is OL, F1 needs to be replaced; If the reading is Bi, F1 deans io be replaced.
Model UT181A: OPERATING MANUAL 4. Battery charge When the indicator of battery level in upper right corner is less than 5% of full capacity, the meter should be immediately charged, otherwise it wil affect the measurement accuracy. As shown in Figure 19, set the rotary switch fo the string "Please plug in AC adapter!” on the display prompt you to insert a power adapter for charging. Connect the power connector to the four terminals in the melee, then insert the power adapter into the power connector.
65 Mode! UT181A: OPERATING MANUAL Manufacturer: Uni-Trend Technology (China) Limited No 8, Gong Ye Bei 1st Road Tangshan Lake National High-Tech Industrial Development Zone, Guangdong City Guangdong Province China Postal Code:523 808 Headquarters: Uni-Trend Group Limited Rm801, 8/F, Nan yang Plaza 57 Hung To Road Kwan Tong Kowloon, Hong Kong Tel: (852) 2950 9168 Fax: (852) 2950 9303 Email: uni-rend.