Unit VC820 Manual de usuario
VC820/VC840OPERATINGMANUAL
1
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
A. DC Voltage Measurement
B. AC Voltage Measurement
C. Measuring Resistance
D. Testing for Continuity
E. Testing Diode
F. Capacitance Measurement
G. Frequency or Duty Cycle Measurement
H. Temperature Measurement
I. DC or AC Current Measurement
Operation of Hold Mode
The Use of Relative Value Mode
POWER Button
VC820/VC840OPERATINGMANUAL
2
SELECT Button (blue)
General Specification
Accuracy Specification
A. DC Voltage
B. AC Voltage
C. Resistance
D. Continuity Test
E. Diode Test
F. Capacitance
G. Frequency & Duty Cycle
H. Temperature
I. DC Current
J. AC Current
Maintenance
A. General Maintenance & Service
B. Testing the Fuses
C. Replacing the Battery
D. Replacing the Fuses
RS232C Serial Port
A. Connect with computer
B. RS232C Port Cable
C. Setting of RS232C Serial Ports
D. System Requirements for Computer Interface Software
VC820/VC840OPERATINGMANUAL
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Overview
This Operating Manual covers information on safety and cautions. Please read the relevant information carefully and
observe all the warnings and notes strictly.
Warning
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.
In addition to the conventional measuring functions, there is a RS232C standard serial port is equipped with this Meter for
easy connection with computer to realize macro recording and monitoring and capture of transient dynamic data, displaying
change of waveform during the measurement, providing data and evidence to engineering technicians for scientific research.
This is also a highly applied digital multimeter of high performance with full input protection. VC840 also has true rms
reading for AC voltage and AC current measurements.
Except where noted, the descriptions and instructions in this Operating Manual apply to both the VC820 and VC840.
Unpacking Inspection
Open the package case and take out the Meter. Check the following items carefully to see any missing or damaged part:
VC820/VC840OPERATINGMANUAL
4
Item Description Qty
1 Operating Manual 1 piece
2 Test Lead 1 pair
3RS232C(I) Interface cable 1 piece
4 Installation Guide & Software (CD-ROM) 1 piece
5Test Clip 1 piece
6 Temperature Probe (VC840 ONLY) 1 piece
In the event you find any missing or damage, please contact your dealer immediately.
Safety Information
In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter or the
equipment under test.
This Meter complies with the standards GB4793.1 & IEC1010-1: In pollution degree 2, overvoltage category (CAT II
1000V, CAT III 600V) and double insulation.
CAT II: local classification of CAT II electronic equipment, portable units. Its transient overvoltage shall be less than that of
CAT III.
CAT III: Distribution level, fixed installation, with smaller transient overvoltage than CAT IV
Rules For Safe Operation
VC820/VC840OPERATINGMANUAL
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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.
2. If the test lead is/are damaged, replace new test lead with same model no. or identical electrical specifications.
3. When using the test leads, keep your fingers behind the finger guards.
4. Do not impose any effective voltage over 1000V on the terminal and earth of the Meter to prevent electric shock and
damage to the Meter.
5. When the Meter working at an effective voltage over 60V in DC or 30V in AC, special care should be taken for there is
danger of electric shock.
6. Do not operate the Meter with the case (or part of the case) removed; there is danger of electric shock.
7. When replacing fuse or battery, the test leads should be disconnected from the tested circuit and the POWER should be
pressed off before opening the case.
8. Identical nominal fuse of quick response must be used for replacement of a broken fuse.
9. The rotary switch should be placed in the right position and no any changeover of range shall be made during
measurement is conducted to prevent damage of the Meter.
10. The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident.
11. Replace the battery as soon as the battery indicator appears. With a low battery, the Meter might produce false
readings that can lead to electric shock and personal injury.
12. Soft cloth and neutral detergent should be used to clean the surface of the Meter when servicing. No abrasive and
solvent should be used to prevent the surface of the Meter from corrosion, damage and accident.
13. Do not use the Meter in an environment of high temperature, humidity, and storage of explosive or inflammable
materials. Particularly not to put the Meter in a humid condition for storage. The performance of the Meter may
deteriorate after dampened.
14. Use the proper terminals, function, and range for your measurements.
VC820/VC840OPERATINGMANUAL
6
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
VC820/VC840OPERATINGMANUAL
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Functional Button
Rotary Switch
HzVΩInput 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 .
µAmA0C Input Terminal: (VC840 ONLY)
Insert red test lead for testing current µA or mA or temperture.
20A Input Terminal:
Insert red test lead for testing current A
Rotary Switch
Switch Position Function
VAC or DC Voltage Measurement
Ω(VC820 ONLY) Continuity or Diode or Resistance Test
Ω(VC840 ONLY) Continuity or Diode or Resistance or Capacitance Test
(VC820 ONLY) Capacitance Test
Hz Frequency Measurement
(VC840 ONLY) Temperature in Celsius
µAAC or DC Current Measurement from 0.1µA to 4000µA
mA AC or DC Current Measurement from 0.01mA to 400.0mA
AAC or DC Current Measurement from 0.001A to 20.00A
VC820/VC840OPERATINGMANUAL
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Functional Buttons
Button Function O
p
eration Performed LCD Dis
p
la
y
POWER
(the red button) Power Switch Turn the power on and off.
SELECT
(the blue button) Function Selector Press SELECT to select function when there is more
than one function at one rotary switch position; the Meter
beeps.
RANGE Manual or Auto
Range Selection 1. Press RANGE to enter the manual ranging mode;
the Meters beeps.
Manually selecting a range causes the Meter to exit
the Hold and REL modes.
2. Press RANGE to step through the ranges available
for the selected function; the Meter beeps.
3. Press and hold RANGE for 2 seconds to return to
autoranging; the Meter beeps.
Hz or %Hz % Frequency or Duty
Cycle Test a. In frequency mode, press Hz % to toggle between
frequency measurement (Hz) and duty cycle (%)
mode; the Meter beeps.
b. In voltage or current mode, press Hz % to toggle
between voltage (V) or current (A) measurement
and frequency measurement (Hz) and duty cycle (%)
mode; the Meter beeps.
V or µA or mAor
Aor Hz or %
VC820/VC840OPERATINGMANUAL
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REL Relative Value
Mode Press REL to enter and exit the REL mode in any
mode; the Meter beeps.
HOLD H Data Holding Press HOLD to enter and exit the Hold mode in any
mode.
Display Symbols (see figure 2)
Number S
y
mbol Meanin
g
1AC Indicator for AC voltage or current.
VC820: The displayed value is the mean value.
VC840: The dis
p
la
y
ed value is the true rms value.
2TRMS
(VC840ONLY) Indicator for true rms value.
VC820/VC840OPERATINGMANUAL
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3The Meter is in the auto range mode in which the Meter automatically selects the
range with the best resolution.
4RS232C Data output is in progress.
5 % Indicator for duty cycle.
6Data hold is active.
7The relative value mode is on to display the stored value minus the present value.
8The battery is low.
Warning: To avoid false readings, which could lead to possible electric
shock or personal injury, replace the battery as soon as the battery indicator
a
pp
ears.
90CCentigrade. The unit of temperature.
10 Test of diode
11 The continuit
y
buzzer is on.
Ω,kΩ,MΩΩ:
kΩ:
MΩ:
Ohm. The unit of resistance.
kilohm. 1 x 103or 1000 ohms.
Megohm. 1 x 106or 1,000,000 ohms.
µF, nF F:
µF:
nF:
Farad. The unit of capacitance.
Microfarad. 1 x 10-6 or 0.000001 farads.
Nanofarad. 1 x 10-9 or 0.000000001 farads.
12~16
Hz, kHz, MHz Hz:
kHz:
MHz:
Hertz. The unit of frequency.
Kilohertz. 1 x 103or 1000 hertz.
Meghertz. 1 x 106or1,000,000 hertz.
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