Model VC940: OPERATING MANUAL
4
Chapter 1
Before You Start
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
To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully before using the Meter.
Digital Multimeter
VC940
(hereafter referred to as “the Meter”) is a 39999 counts and 4 3/4 digits with steady operations, fashionable structure and auto ranging instrument. The
Meter has analog bar graph, ACV & ACA True RMS and full range overload protection
.
The Meter not only can measure AC voltage and current, DC voltage and current, Resistance, Capacitance, Temperature, Frequency, Diodes, Continuity, 4~20mA Loop,
Max/Min, Relative Mode but also has Low Battery Display, Store, Recall, Data Hold, Automatic Power Off and power features
.
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
Qty
1
English Operating Manual
1 piece
2
Test Lead
1 pair
3
K-Type (nickel chromium ~
nickel silicon) Point Contact
Temperature Probe (It is only
suitable for measuring
temperature under 230
°C
1 piece
5
Alligator Clip
1 piece
6
RS232C interface cable
1 piece
7
CD-ROM (Installation Guide &
Computer Interface Software)
1 piece
8
9V Battery (NEDA 1604, 6F22,
006P)
1 piece
9
Power Adaptor
1 piece
In the event you find any missing or damage, please contact your dealer immediately.
Safety Information
This Meter complies with the standards IEC61010 safety measurement requirement: in pollution degree 2, overvoltage category (CAT. III 1000V, CAT.
IV
600V) and double
insulation.
CAT. III: Distribution level, fixed installation, with smaller transient overvoltage than CAT. IV
CAT.
IV
: Primary supply level, overhead lines, cable systems etc.
Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired.
In this manual, a
Warning
identifies conditions and actions that may pose hazards to the user, or may damage the Meter or the equipment under test.
A
Note
identifies the information that user should pay attention to.
International electrical symbols used on the Meter and in this Operating Manual are explained on page XX.
Rules For Safe Operation
Warning
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:
z
Before using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of the case) is removed. Look for cracks or missing
plastic. Pay attention to the insulation around the connectors.
z
Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads with identical model
number or electrical specifications before using the Meter.
z
Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and grounding.
z
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.
z
When the Meter working at an effective voltage over 60V in DC or 30V rms in AC, special care should be taken for there is danger of electric shock.
z
Use the proper terminals, function, and range for your measurements.
z
If the value to be measured is unknown, use the maximum measurement position.
z
Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable and strong magnetic field. The performance of the
Meter may deteriorate after dampened.
z
When using the test leads, keep your fingers behind the finger guards.
z
Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes.
z
Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter to the circuit.
z
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.
z
When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.
z
The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident.
z
Soft cloth and mild 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.
z
The Meter is suitable for indoor use.
z
Turn the Meter off when it is not in use and take out the battery when not using for a long time.
z
Constantly check the battery as it may leak when it has been using for some time, replace the battery as soon as leaking appears. A leaking battery will damage
the Meter.
International Electrical Symbols
Symbols used on the Meter and in this manual are explained in Table1-2.
