UNI-T VC820 Operating Manual
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UNI-T VC820 Operating Manual

UNI-T VC820 Operating Manual

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VC820/VC840 OPERATING MANUAL

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DC or AC Current Measurement
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  • Page 1: Table Of Contents

    VC820/VC840 OPERATING MANUAL Table of Contents Title Page Overview Unpacking Inspection Safety Information Rules For Safe Operation Electrical Symbols Functional Structure Rotary Switch Functional Buttons Display Symbols Manual Ranging and Autoranging Measurement Operation DC Voltage Measurement AC Voltage Measurement Measuring Resistance...
  • Page 2 VC820/VC840 OPERATING MANUAL SELECT Button (blue) General Specification Accuracy Specification DC Voltage AC Voltage Resistance Continuity Test Diode Test Capacitance Frequency & Duty Cycle Temperature DC Current AC Current Maintenance General Maintenance & Service Testing the Fuses Replacing the Battery...

  • Page 3: Overview

    Read the Rules for Safety Operation carefully before using the Meter Digital Multimeter Model VC820 and VC840 (hereafter referred to as “the Meter”) has autorange and manual range options with maximum reading 3999. The enclosure structure design adopted advanced “co-injection” technique in order to provide sufficient insulation.

  • Page 4: Safety Information

    VC820/VC840 OPERATING MANUAL Item Description Operating Manual 1 piece Test Lead 1 pair RS232C (I) Interface cable 1 piece Installation Guide & Software (CD-ROM) 1 piece 1 piece Test Clip Temperature Probe (VC840 ONLY) 1 piece In the event you find any missing or damage, please contact your dealer immediatel...
  • Page 5 VC820/VC840 OPERATING MANUAL 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: 1. Do not use this Meter in the event you find the test lead, LCD display, or insulation of the case is/are obviously broken, or you believe this Meter being malfunctioned.

  • Page 6: Electrical Symbols

    VC820/VC840 OPERATING MANUAL Electrical Symbols AC (Alternating Current) Deficiency of Built-In Battery DC (Direct Current) Continuity Test AC or DC Diode Grounding Fuse Double Insulated Conforms to Standards of European Union Warning Functional Structure (see figure 1) LCD Display...

  • Page 7: Rotary Switch

    HzVΩ Input Terminal: Insert the red test lead for testing voltage, frequency/duty cycle, resistance, diode, continuity and capacitance. COM Terminal: Insert black test lead. µAmA Input Terminal: (VC820 ONLY) Insert red test lead for testing current µA or mA µAmA C Input Terminal: (VC840 ONLY) Insert red test lead for testing current µA...

  • Page 8: Functional Buttons

    VC820/VC840 OPERATING MANUAL Functional Buttons Button Function Operation Performed LCD Display POWER Power Switch Turn the power on and off. (the red button) Function Selector Press SELECT to select function when there is more SELECT (the blue button) than one function at one rotary switch position; the Meter beeps.

  • Page 9: Display Symbols

    HOLD H Display Symbols (see figure 2) Number Symbol Meaning Indicator for AC voltage or current. VC820: The displayed value is the mean value. VC840: The displayed value is the true rms value. TRMS Indicator for true rms value. (VC840ONLY)
  • Page 10 VC820/VC840 OPERATING MANUAL The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution. Data output is in progress. RS232C Indicator for duty cycle. Data hold is active. The relative value mode is on to display the stored value minus the present value.

  • Page 11: Manual Ranging And Autoranging

    VC820/VC840 OPERATING MANUAL V, mV Volts. The unit of voltage. Millivolt. 1 x 10 or 0.001 volts. A, mA, µA Amperes (amps). The unit of current. Milliamp. 1 x 10 or 0.001 amperes. µA: Microamp. 1x 10 or 0.000001 amperes.

  • Page 12: Measurement Operation

    VC820/VC840 OPERATING MANUAL Each presses of RANGE increments the range. When the highest range is reached, The Meter wraps to the lowest range. NOTE If you manually change the measurement range after entering the REL or Hold recording modes, the Meter exits these modes..

  • Page 13: Ac Voltage Measurement

    VC820/VC840 OPERATING MANUAL The measured value shows on the display. In each range, the Meter has an input impedance of 10MΩ. This loading effect can cause measurement errors in high impedance circuits. If the circuit impedance is less than or equal to 10kΩ, the error is negligible (0.1% or less).

  • Page 14: Measuring Resistance

    VC820/VC840 OPERATING MANUAL When the reading obtained is less than “100”, the effective value converter needs a longer time to become stabilize. When there is no input voltage, the maximum reading displayed is “10”. When AC voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

  • Page 15: Testing For Continuity

    VC820/VC840 OPERATING MANUAL of the Meter. When the value of shorted test lead is higher than 0.5Ω, check the test lead connection, proper terminal, function and range are made properly. For high-resistance measurement (>1MΩ), it is normal that it will take several seconds to obtain a stable reading.

  • Page 16: Testing Diode

    VC820/VC840 OPERATING MANUAL Testing Diode 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. 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.

  • Page 17: Frequency Or Duty Cycle Measurement

    COM terminal. 2. Set the rotary switch to . (For VC820 switch toΩ and press SELECT to select nF measurement mode.) 3. Connect the test leads or the test clips across with the object being measured.

  • Page 18: Temperature Measurement

    VC820/VC840 OPERATING MANUAL The measurement range is from 5Hz to 10MHz. To measure frequency, connect the Meter as follows: Ω 1. Insert the red test lead into the HzV terminal and the black test lead into the COM terminal. Set the rotary switch to Hz.
  • Page 19 To measure current, do the following: Turn off power to the circuit. Discharge all high-voltage capacitors. VC820: Insert the red test lead into the µAmA or 20A terminal and the black test lead into the COM terminal. VC840: Insert the red test lead into the µAmA or 20A terminal and the black test lead into the COM terminal.

  • Page 20: Operation Of Hold Mode

    VC820/VC840 OPERATING MANUAL Use the 20A terminal and A range if the current value to be tested is an unknown. 3. Set the rotary switch to µA , mA , or A . 4. The Meter defaults to DC current measurement mode. To toggle between DC and AC current measurement function, press SELECT (blue button).

  • Page 21: The Use Of Relative Value Mode

    VC820/VC840 OPERATING MANUAL The Hold mode is applicable to all measurement functions. Press HOLD H to enter Hold mode; the Meter beeps. Press HOLD H again or RANGE or Hz % or turn the rotary switch to exit Hold mode; the Meter beeps.

  • Page 22: Power Button

    Ω ” Maximum voltage between terminal and ground is 1000Vrms. µA mA Input Terminal : 0.5A, 600V fast type ceramic fuse. (VC820) µA mA Input Terminal: 0.5A, 600V fast type ceramic fuse. (VC840) 20 A Input Terminal 20A, 600V fast type ceramic fuse.

  • Page 23: Accuracy Specification

    VC820/VC840 OPERATING MANUAL Battery Type One piece of 9V NEDA1604 or 6F22 or 006P. Battery Deficiency Display Dimensions (HxWxL) 177 x 85 x 40 mm. Weight Approximate 300g (battery included). Certificate Accuracy Specification Accuracy ± a% reading + b digits guarantee for 1 year.

  • Page 24: Resistance

    VC820/VC840 OPERATING MANUAL Input impedance ≥10MΩ. VC820, displays effective value of sine wave (mean ±(1%+5) 10mV 1000V DC value response). 750V AC 100mV 400V VC840, displays true rms value. ±(1.2%+5) 750V Frequency response 40 400Hz. C. Resistance Resolution Range Accuracy...

  • Page 25: Capacitance

    VC820/VC840 OPERATING MANUAL Range Resolution Input Protection Remarks Open circuit voltage approximate 1.48V Diode 1000Vp Displays approximate forward bias voltage drop: 0.5V~0.8V F. Capacitance Resolution Range Accuracy Input Protection Remarks ±(3%+10) 40nF 10pF Measure at REL mode 400nF 100pF ±(3%+5) 4µF...

  • Page 26: Temperature

    VC820/VC840 OPERATING MANUAL H. Temperature (VC840 ONLY) Resolution Range Accuracy Input Protection ±(3%+4) Fused 0.5A, 600V, fast type, φ5x25 mm. ±(1%+3) 1000 ±(2%+10) 1000 DC Current Resolution Accuracy Range Input Protection Remarks VC820 VC840 400µA 0.1µA ±(1%+2) 4000µA 1µA Ceramic Fuse 0.5A, 600V 40mA 0.01mA...

  • Page 27: Maintenance

    VC820/VC840 OPERATING MANUAL 400µA 0.1µA Frequency response 50 ~ 400Hz. ±(1.5%+5) 4000µA 1µA VC820: displays effective value of Ceramic Fuse 0.5A, 600V sine wave (mean value response). 40mA 0.01mA ±(2%+5) VC840: displays true rms value. 400mA 0.1mA 0.001A For continuous measurement≤10 ±(2.5%+5)

  • Page 28: Replacing The Battery

    VC820/VC840 OPERATING MANUAL or fuse. To prevent damage or injury, install ONLY replacement fuses with identical amperage, voltage, and speed ratings. To test the fuse: Set the rotary switch to Ω and press SELECT (blue button) to select Ω Plug a test lead into the terminal HzV and connect the probe tip to the 20A terminal.
  • Page 29 VC820/VC840 OPERATING MANUAL 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. To replace the battery: 1. Press the POWER to turn the Meter off and remove all connections from the terminals.
  • Page 30 VC820/VC840 OPERATING MANUAL 2. Remove the screw from the battery compartment, and separate the battery compartment from the case bottom. 3. Remove the battery from the battery compartment. 4. Replace the battery with a new 9V battery (NEDA1604, 6F22 or 006P) 5.

  • Page 31: Rs232C Serial Port

    VC820/VC840 OPERATING MANUAL accordance with the following procedure. To replace the Meter’s fuse: Press the POWER to turn the Meter off and remove all connections from the terminals. Remove the screw from the battery compartment, and separate the battery compartment from the case top.

  • Page 32: Connect With Computer

    VC820/VC840 OPERATING MANUAL Connect with computer Connect the Meter with a computer using RS232C serial port as shown in figure5...

  • Page 33: Rs232C Port Cable

    VC820/VC840 OPERATING MANUAL B. RS232C Port Cable The Meter Computer D-sub D-sub D-sub 9 Pin Male 9 Pin Female 25 Pin Female Name C. Setting of RS232C Serial Ports Default of RS232C serial port for communication is set as: Baud Rate...
  • Page 34 Can access to a local or a network CD-ROM. A free serial port. A mouse or other pointing device supported by Windows. Please refer to “ VC820/VC840Computer Interface Software ” for installation and operation instructions of the Interface Software. **END** * This operating manual is subject to change without notice.*...
  • Page 35 VC820/VC840 Computer Interface Software A. System Requirements To use vc820_840 Interface Program, you need the following hardware and software: An IBM PC or equivalent computer with 80486 or higher processor and 640 x 480 pixel or better monitor. Microsoft Windows 95 or above.
  • Page 36 VC820/VC840 Computer Interface Software To run the vc820_840 Interface Program, please do the followings: 1. Insert the supplied RS232C (I) interface cable into the slot at the back of the meter and properly connect the other end of the cable to the serial port of computer.
  • Page 37 VC820/VC840 Computer Interface Software Next Graphic Selection Clear No. of records setting Previous Last Save First Zoom In Fill-Up Graph (figure 1) Data Recording Operations (see figure 2) During the connection, you can select the following functions by clicking the corresponding icon: Repeat: Click the box to keep the repeat record, or unclick the box to ignore the repeat record.
  • Page 38 VC820/VC840 Computer Interface Software Sampling Interval: Click to enable sampling interval function, or unclick to disable the function Enter the sampling interval time, the unit is second. Clear: To clear all the records permanently. Save: To save all the record.
  • Page 39 VC820/VC840 Computer Interface Software MIN: Recorded minimum value. SetMax: Click to enable the SetMax function or unclick to disable. Enter the upper limit value in full digit, it does not identify range or function. SetMin: Click to enable the SetMin function or unclick to disable.
  • Page 40 VC820/VC840 Computer Interface Software Remarks: 1. Before you re-install the software, please remove the installed program as follows: My Computer > Control Panel > Add/Remove Programs 2. If abnormal digits or symbols were found, please remove font ”UNIT-A2” and then install new font set from ”FONT”...
  • Page 41 VC820/VC840 Computer Interface Software...

This manual is also suitable for:

Vc840

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