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UNI-T UT81C Operating Manual

Scope digital multimeter
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P/N:110401103423

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  • Page 1 P/N:110401103423...
  • Page 2 Model UT81C OPERATING MANUAL...

  • Page 3: Table Of Contents

    Model UT81C: OPERATING MANUAL Table of Contents Chapter Title Page Before You Start Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols Using The Testing Tool Reading the screen The Meter Structure Functional Buttons Making Measurements A. Scope Mode i.
  • Page 4 Model UT81C: OPERATING MANUAL Table of Contents Chapter Title Page vii. Measuring Capacitance Using Software Maintenance The Test Tool A. General Service B. Replacing the Fuses C. Replacing the Battery Specifications Safety and Compliances Physical Specifications General Specifications (Digital Multimeter)
  • Page 5 Model UT81C: OPERATING MANUAL Table of Contents Chapter Title Page H. Frequency and Duty Cycle % I. Capacitance...
  • Page 6 Model UT81C: OPERATING MANUAL List of Tables Table Title Page Unpacking Inspection International Electrical Symbols Reading the Screen Functional Buttons...
  • Page 7 Model UT81C: OPERATING MANUAL List of Tables Figure Title Page Meter Structure Functional Buttons Waveform Display Voltages Measurement μ A Range Measurement mA Range Measurement 10A Range Measurement Resistance Measurement Diode Test Continuity Test Frequency / Duty Cycle Measurement 3-10...

  • Page 8: Before You Start

    Meter. Digital Multimeter mode can measure AC voltage and current, DC voltage and current, Resistance, Scope Digital Multimeter UT81C (hereafter referred to Capacitance, Frequency, Duty Cycle, Diodes and as “the Meter”) is a 3999 counts and 3 3/4 digits adopting Continuity.

  • Page 9: Unpacking Inspection

    Model UT81C: OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see any missing or damaged part: Table 1-1. Unpacking Inspection Item Description English Operating Manual 1 piece...

  • Page 10: Safety Information

    Model UT81C: OPERATING MANUAL International electrical symbols used on the Meter and Safety Information in this Operating Manual are explained on page 10. This Meter complies with the standards IEC61010 safety measurement requirement: in pollution degree 2, Rules For Safe Operation overvoltage category (CAT.
  • Page 11 Model UT81C: OPERATING MANUAL connecting the Meter to the circuit. shock or damages to the Meter. Replace the battery as soon as the battery The rotary switch should be placed in the right position and no any changeover of range shall indicator appears.

  • Page 12: International Electrical Symbols

    Model UT81C: OPERATING MANUAL l Under the influence of Radiated Radio-Frequency International Electrical Symbols Electromagnetic Field phenomenon, the captioned Symbols used on the Meter and in this manual are model have a 20% measurement error, it will be explained in Table1-2.

  • Page 13: Using The Testing Tool

    Model UT81C: OPERATING MANUAL Chapter 2 Using the Testing Tool Reading the Screen The screen displays the menu that provides the following choices available: Table 2-1. Reading the Screen Table 2-1. Reading the Screen Display Description Display Description RANG Decrease a range...

  • Page 14: The Meter Structure

    Model UT81C: OPERATING MANUAL The Meter Structure The Figure 2-1 shows the Meter structure. 1. USB Terminals 2. LCD Display 3. Functional Buttons 4. Rotary Switch 5. Power adaptor Input Terminals 6. 10A Input Terminal 7. mA μ A Input Terminals 8.

  • Page 15: Functional Buttons

    Model UT81C: OPERATING MANUAL Functional Buttons Table 2-2. Functional Buttons The buttons activate features that augment the function selected with the rotary switch. The buttons are shown Description Buttons in Table 2-2. Software functional buttons, details F1, F2, please refer to the below.
  • Page 16 Model UT81C: OPERATING MANUAL Table 2-2. Functional Buttons Description Buttons To switch between waveform display Mode (scope mode) and digital reading (multimeter mode). This button is only valid when under voltage, frequency, currents mode. Press Set button to set the auto power...

  • Page 17: Making Measurements

    Model UT81C: OPERATING MANUAL Chapter 3 Making Measurement Introduction Chapter 3 explains how to make measurements. Based on the working environment to set up sleep mode, contrast, beep You could turn the Meter off by turning to OFF position Press Set button to set the auto power off, display or set up the sleep mode from 1-30 minutes.
  • Page 18 Model UT81C: OPERATING MANUAL F2: Set the Display Backlight F4: Set the beeps features, it can only be used under BK Light ENTER resistance, diode and continuity measurement. Beep ENTER The brightness level from 0 to 31. Press F4 to confirm, save and return.

  • Page 19: Scope Mode

    Model UT81C: OPERATING MANUAL Press Range to switch between DC and AC measurement. Turn the rotary switch to ACV, DCV, Hz, ACA or DCA When the frequency and amplitude of a waveform range, the Meter displays digital reading (Multimeter is unknown, press Auto : mode).
  • Page 20 Model UT81C: OPERATING MANUAL Y-axis adjustment: Press Range button under scope increase the number of periods mode, the corresponding functional button: decrease the number of periods. Move Move Rang Rang trigger point move left trigger point right move move up the waveform...

  • Page 21: Trigger Function

    Model UT81C: OPERATING MANUAL 10 location) F4: confirm Press Trig button under scope mode, the corresponding function buttons: When saving the data, it will overwrite the current data in the location no matter that location has data Trig Trig Auto/Norm/Shot Slop Rrise/Fall or not.

  • Page 22: Digital Multimeter Mode

    Model UT81C: OPERATING MANUAL B. Digital Multimeter Mode be returned to working mode to carry out measurement. Warning In order to have more accurate waveform, user can buy an optional BNC probe and scope probe to decrease To avoid harms to you or damages to the Meter signal attenuates.
  • Page 23 Model UT81C: OPERATING MANUAL When measuring voltage, the corresponding functional buttons AC / DC Rang Rang toggle between AC or DC relative mode (REL will be displayed at the right bottom of the LCD when it is on) select a range up...

  • Page 24: Measuring Currents

    Model UT81C: OPERATING MANUAL Warning If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt. To avoid possible damage to the Meter or to the equipment under test, check the Meter’s fuses before measuring current.
  • Page 25 Model UT81C: OPERATING MANUAL 1. Insert the red test lead into the μ mA terminal and black test lead into the COM terminal. To measure AC μ A or DC μ A currents, set up the 2. Set the rotary switch to μ A .
  • Page 26 Model UT81C: OPERATING MANUAL 1. Insert the red test lead into the μA mA terminal and black test lead into the COM terminal. To measure ACmA or DcmA currents, set up the 2. Set the rotary switch to mA .
  • Page 27 Model UT81C: OPERATING MANUAL 1. Insert the red test lead into the 10A terminal and black test lead into the COM terminal. To measure AC 10A or DC 10A currents, set up 2. Set the rotary switch to A the Meter as Figure 3-5 and proceed as follows: 3.
  • Page 28 Model UT81C: OPERATING MANUAL When measuring current, the corresponding functional Note buttons: After changing the measurement mode, the AC / DC Rang Rang autoranging will be off automatically and the AUTO will be disappeared at the bottom left of the LCD.

  • Page 29: Measuring Resistance

    Model UT81C: OPERATING MANUAL Warning To avoid possible damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance. To measure resistance, set up the Meter as shown in Figure 3-6 and follow the following procedure: Figure 3-6.
  • Page 30 Model UT81C: OPERATING MANUAL 1. Insert the red test lead into the Ω terminal and the Note black test lead into the COM terminal. Ω When measuring low resistance, the test leads can 2. Set the rotary switch to add 0.1Ω to 0.2Ω of error to resistance measurement.

  • Page 31: Testing Diodes

    Model UT81C: OPERATING MANUAL To test the diode out of a circuit, set up the Meter as Figure 3-7 and proceed as follows: Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 42V rms AC.
  • Page 32 Model UT81C: OPERATING MANUAL 1. Insert the red test lead into the Ω terminal and the Note black test lead into the COM terminal. Connect the test leads to the proper terminals as Ω 2. Set the rotary switch to said above to avoid error display.

  • Page 33: Testing For Continuity

    Model UT81C: OPERATING MANUAL To test for continuity, set up the Meter as Figure 3-8 and do the following: Warning To avoid harms to you, please do not attempt to input voltage higher than 60V DC or 42V rms AC.
  • Page 34 Model UT81C: OPERATING MANUAL 1. Insert the red test lead into the W terminal and the Note black test lead into the COM terminal. When continuity testing has been completed, Ω 2. Set the rotary switch to disconnect the connection between the testing leads 3.
  • Page 35 Model UT81C: OPERATING MANUAL 1. Insert the red test lead into the Hz terminal and the black test lead into the COM terminal. Warning 2. Set the rotary switch to Hz. To avoid harms to you, please do not attempt to 3.
  • Page 36 Model UT81C: OPERATING MANUAL Note The requirement of Input amplitude “a” is as follows: When 1MHz: 300 mV 30Vrms; 1MHz: 600 mV 5Vrms It is normal to have few seconds run time when switch from other functions to these functions.

  • Page 37: Measuring Capacitance

    Model UT81C: OPERATING MANUAL To measure capacitance, set up the Meter as shown in Figure 3-10 and proceed as follows: Warning To ensure accuracy, the Meter inside is discharged against the tested capacitor To avoid damage to the Meter or to the equipment...
  • Page 38 Model UT81C: OPERATING MANUAL Insert the red test lead into theterminal and the When measuring capacitance, the corresponding black test lead into the COM terminal. functional buttons: Set the rotary switch to measurement mode, the Capacity Meter may display a fixed reading which is a internal distributed capacitor value.

  • Page 39: Using Software

    Model UT81C: OPERATING MANUAL Chapter 4 Using Software When using the Software, please refer to the Installation Guide of the included CD-ROM.

  • Page 40: Maintenance The Test Tool

    Model UT81C: OPERATING MANUAL Chapter 5 Maintaining The Test Tool This chapter provides basic maintenance information high temperature, explosive, inflammable and strong including battery and fuse replacement instruction. magnetic field. Warning Do not attempt to repair or service your Meter...

  • Page 41: Replacing The Fuses

    Model UT81C: OPERATING MANUAL B. Replacing the Fuses Follow Figure 5-1 and proceed as follows to replace the Meter’s fuse: 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.

  • Page 42: Replacing The Battery

    Model UT81C: OPERATING MANUAL C. Replacing the Battery 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. Make sure the test leads are disconnected from the circuit being tested before opening the case bottom.

  • Page 43: Specifications

    Model UT81C: OPERATING MANUAL Chapter 6 Specifications Safety and Compliances Maximum Voltage between any Terminal and Refer to different range input protection voltage Grounding Certification Compliances IEC 61010 CAT. II 1000V, CAT.III 600V overvoltage and double insulation standard Fused Protection for mA input terminal: F0.5AH/1000V, ø6×32mm...

  • Page 44: Physical Specifications

    Model UT81C: OPERATING MANUAL Physical Specifications Digital: 3999 counts on display ; updates 2-3 times / second. Display (LCD) C~40 C (32 F~104 Operating Temperature C~50 C (14 F~122 Storage Temperature 75% @ 0 C~40 Relative Humidity 0% @ -10 C~50 2000m;...

  • Page 45: General Specifications (Digital Multimeter)

    Model UT81C: OPERATING MANUAL General Specifications ( Digital Multimeter) When it is under Multimeter mode, you could select either auto or Range manual ranging. Auto, negative polarity displays “-“ Polarity Display OL Overloading Display Battery Deficiency General Specifications (Scope) 160 x 160 Monochrome...

  • Page 46: Feature Summary

    Model UT81C: OPERATING MANUAL Feature Summary 160 x 160 Monochrome Display When it is under multimeter mode, the Meter automatically selects Autorange best range Beeper sounds for resistance readings below threshold. Continuity Measure signal on or off time in %.

  • Page 47: Basic Specifications (Scope)

    Model UT81C: OPERATING MANUAL Basic Specifications (Scope) Horizontal Vertical UT81C 80M per second Bandwidth UT81C:16MHz Sampling rate Sampling rate / Scale 20 pixels Channel Single Updating rate >5 Coupling Free Run / Normal / Single Trigger types Voltage resolution 8 Bits...

  • Page 48: Dc Voltage

    Model UT81C: OPERATING MANUAL A. DC Voltage Range Resolution Accuracy Overload Protection Input Impedance 100 μ V 400mV Around 10MΩ (0.8%+8) 1000V DC or AC 10mV (excluding waveform) 400V 100mV (1%+8) 1000V B. AC Voltage Range Resolution Accuracy Overload Protection...

  • Page 49: Dc Current

    Model UT81C: OPERATING MANUAL C. DC Current Range Resolution Accuracy Overload Protection 400 μ A 0.1 μ A (1%+8) 4000 μ A 1 μ A F0.5AH/1000V, ø6×32mm 10 μ A 40mA (1.2%+8) 100 μ A 400mA F10AH/1000V, ø6×32mm (1.5%+8) (Continuous measurement 10 seconds 10mA and interval more than 15 minutes.)

  • Page 50: Ac Current

    Model UT81C: OPERATING MANUAL D. AC Current Range Resolution Accuracy Overload Protection 400 μ A 0.1 μ A (1.5%+8) 4000 μ A 1 μ A F0.5AH/1000V, ø6×32mm 10 μ A 40mA (2%+8) 100 μ A 400mA F10AH/1000V, ø6×32mm (2.5%+5) 10mA (Continuous measurement 10 seconds and interval more than 15 minutes.)

  • Page 51: Resistance

    Model UT81C: OPERATING MANUAL E. Resistance Range Resolution Accuracy Overload Protection 400Ω 0.1Ω (1.2%+5) 4kΩ 1Ω 40kΩ 10Ω (1%+5) 250VDC or AC rms 400kΩ 100Ω 4MΩ 1kΩ (1.2%+5) 40MΩ 10kΩ (1.5%+5) F. Diode Test Range Resolution Overload Protection Remarks A good silicon junction drops 250V DC or AC between 0.5V and 0.8V.

  • Page 52: Continuity Test

    Model UT81C: OPERATING MANUAL G. Continuity Test Test Range Resolution Overload Protection Remarks l The buzzer sounds when the test resistance is 10Ω. 0.1 Ω 750V DC or AC l The buzzer does not sound when the test resistance is 100Ω.

  • Page 53: I. Capacitance

    Model UT81C: OPERATING MANUAL I. Capacitance Range Resolution Accuracy Overload Protection 40nF 10pF Under REL mode: (3%+10) 400nF 100pF 4 μ F 250V DC or AC rms (3%+8) 40 μ F 10nF 100 μ F 100nF (4%+8)
  • Page 54 Model UT81C: OPERATING MANUAL ** END ** This operating manual is subject to change without notice.
  • Page 55 Model UT81C: OPERATING MANUAL...

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