V&A VA503 User manual

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Pen R/C meter for SMD
VA503
Users Manual

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Contents
Page
1. GENERAL INSTRUCTIONS 3
2. DESCRIPTION 5
3. TECHNICAL SPECIFICATIONS 6
4. OPERATING INSTRUCTION 8
5. MAINTENANCE 10

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1 GENERAL INSTRUCTIONS
This pen R/C meter for SMD could fast precise measure
small chip components.
To get the best service from this meter, please read this
user's manual carefully and observe the detailed safety
precautions strictly.
1.1 Precautions safety measures
* When using this meter, the user must observe all
normal safety rules concerning
1.1.1 During use
* Use the meter before must warm-up 30 seconds.
* If the meter is used near noise generating equipment, be
aware that display may become unstable or indicate large
errors.
* Do not use the meter if it looks damaged.
* Use the meter only as specified in this manual; otherwise,
the protection provided by the meter may be impaired.
* Do not operate the meter around explosive gas, vapor, or dust.
* To avoid damages to the instrument, do not exceed the
maximum limits of the input values.
* Caution : Avoid working with voltages above 50VDC
or 36VAC rms. Such voltages pose a shock hazard
and damage the meter
* When using this meter, keep your fingers away from the
metal of the meter.
* Before changing functions, disconnect the test clip from
the circuit under test.
* Replace the battery when the symbol appears.
With a low battery, the meter might produce false display .

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1.1.3 Symbols:
Symbols used in this manual and on the meter:
Caution
:refer to the instruction manual.
Incorrect use may result in damage to the
device or its components.
Conf
orms to IEC1010
1.1.4 Instructions
* Before operating the meter, always disconnect from all
sources of electric current and make sure you are not
charged with static electricity, which may destroy internal
components.
* Any adjustment, maintenance or repair work carried out
on the meter while it is live should be carried out only by
appropriately qualified personnel, after having taken into
account the instructions in this present manual.
* If any faults or abnormalities are observed, take the
instrument out of service and ensure that it can not be
used until it has been checked out.
* If the meter is not going to be used for a long time, take
out the battery and do not store the meter in high
temperature or high humidity environment.
* Never use the meter unless the back cover and battery
cover are in place and fastened fully.

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2. DESCRIPTION
2.1 Instrument Familiarization
1. cathode 2. anode 3.”REL” key
4.”FUNC.” key 5.LCD display 6.Battery cover
2.2 LCD Display
2.3 FUNC. key----Function key
This key is used to select the functions of the meter.
Press this key once, the meter will turn on ad. Then press
and hold this key for over 4 seconds, the meter will power
off.
2.4 REL key----Relative measurement key
This key is used to select the Relative measurement mode.
Press this key once to enter into the Relative measurement
mode, then press this key again, it will back to the normal
mode.




1
2
4
35
6

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2.5 Terminals
+ ：Terminal receiving the anode
-：Terminal receiving the cathode
Only for measuring the diode and the polar capacitance
3. TECHNICAL SPECIFICATIONS
3.1 General specifications
Environment conditions
Pollution degree: 2
Altitude < 2000 m
Operating temperature:
0~40 OC, (<80% RH, non-condensing)
Storage temperature:
-10~60 OC, (<70% RH, battery removed)
Temperature Coefficient:
0.1×(specified accuracy) / OC (<18 OC or >28 OC)
MAX. Voltage between terminals and earth ground:
50V DC or 36V AC rms 。
Sample Rate: 3 times/sec for digital data
Display: 3 3/4 digits LCD display with max. reading 3999
Over Range indication: LCD will display "OL"
Low battery indication:
The " " is displayed when the battery is under the
proper operation range
Auto power off
If there is no key been operated for 15 minutes, the meter
will auto power off to save battery energy.
Power source: 3.0V battery
Dimensions: 181(L)×35(W)×20(H) mm
Weight: 65g. Approx. (battery included)

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3.2 Measurement specifications
* Accuracy: ±(% of reading + number of digits) at 18OC to
28OC (64OF to 82OF) with relative humidity to 80%.
Caution when working with voltages above
50Vdc or 36Vac rms.
3.2.1 Resistance
Range
Resolution
Accuracy
400Ω0.1Ω
±(1.2% of rdg +3digits)
4k
Ω
1
Ω
40kΩ10Ω
400kΩ100Ω
4MΩ1kΩ
40M
Ω
10k
Ω
±(2.0% of rdg +5 digits)
3.2.2 Capacitance
Range
Resolution
Accuracy
4nF 1pF ±（5.0% of rdg +25 digits）
40nF 10pF
±（3.0% of rdg +20 digits）
400nF 100pF
4
µ
F
1nF
40µF 10nF
±（5.0% of rdg +20 digits）
200
µ
F
100nF

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Keep two pins of the capacitance in short before measuring
3.2.3 Diode Test
Range
description
Test Condition
Display read
approx. forward
voltage of diode
Forward DC Current:
approx. 1mA
Reversed DC Voltage:
approx. 1.5V
4. OPERATING INSTRUCTION
4.1 Resistance measurement
To avoid electrical shock or damage
s to the
meter
under test, disconnect circuit power
and discharge
all high-
voltage capacitors
before measuring resistance.
Select the function at mode.
Connect the test clip to the object being measured and
the measured value will show on the display.
NOTE:
For measuring the high-resistance above 1MΩ, it may
take a few seconds to stabilize the reading. This is
normal for high resistance measuring.
When the input is not connected, i.e. at open circuit, the
figure "OL" will be displayed for the over range condition.

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4.2 Capacitance measurement
To avoid electrical shock or damage
s to the
meter
under test, disconnect circuit power and
discharge all high
-
voltage capacitors before
measuring capacitance.
Keep two pins of the
capacitance in short before measuring.
Select the function at mode.
Connect the test clip to the capacitor being measured
and read the displayed value.
NOTE:
The meter may take a few seconds (200µF range, 30
seconds) to stabilize reading. This is normal for high
capacitance measuring.
To improve the accuracy of measurements less than 4nF,
subtract the residual capacitance of the meter and clip.
(Press the REL key to enter into the Relative
measurement mode when it is in the open circuit state)
4.3 Diode measurement
To avoid electrical shock
or damages to the
meter under test
, disconnect circuit power and
discharge all high
-
voltage capacitors before
testing diodes.
Select the function at mode.
Connect the + pin to the anode, the - pin to the cathode
of the diode under testing.
The meter will show the approx. forward voltage of the

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diode. If the lead connection is reversed, only figure "OL"
displayed.
5. MAINTENANCE
5.1 General Maintenance
Periodically wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
5.2 Battery replacement
Before replacing the battery, disconnect test
leads from any circuit under test, turn the meter
off and remove test leads from the input
terminals.
Use the following procedure:
When the battery voltage drop below proper operation
range the symbol will appear on the LCD display
and the battery need to be replaced.
Press the battery cover and towards arrowhead direction
to open the battery cover.
Replace the battery with two new 1.5V batteries(AG13).
Replace the battery cover.