Harbor Freight Tools CEN-TECH 41080 Assembly instructions

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CONTENTS PAGE
SAFETY INFORMATION ….…………………………………………………
SAFETY SYMBOLS .………………………………………………………..
SAFETY PRECAUTIONS …………………………………………………..
MAINTENANCE .…………………………………………………………….
GENERAL DESCRIPTION …..…………………………………………….
FRONT PANEL DESCRIPTION …..……………………………………….
OPERATING INSTRUCTIONS …………………………………………….
SPECIFICATIONS …...……………………………………………………..
REPLACING THE BATTERY ...…………………………………………….
ACCESSORIES ……………………………………………………………..
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SAFETY INFORMATION
The digital clamp meter has been designed according to IEC1010 – 1 and IEC1010 –
2 – 032 concerning safety requirements for electrical measuring instruments and
hand – held current clamps with an overvoltage category (CAT II) and pollution 2.
SAFETY SYMBOLS
Important safety information, refer to the operating manual.
Dangerous voltage may be present.
Earth ground.
Double insulation (Protection class II).
The digital clamp meter complies with the requirements of the following European
Community Directives: 89/336/EEC (Electromagnetic Compatibility) and 73/23/EEC
(Low Voltage) as amended by 93/68/EEC (CE Marking).
However, electrical noise or intense electromagnetic fields in the vicinity of the
equipment may disturb the measurement circuit. Measuring instruments will also
respond to unwanted signals that may be present within the measurement circuit.
Users should exercise care and take appropriate precautions to avoid misleading
SAFETY PRECAUTIONS
Follow all safety and operating instructions to ensure maximum personal safety
during the operation and to ensure the meter is used safely and is kept in good
operating condition.
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Read these operating instructions thoroughly and completely before
operating your meter. Pay particular attention to WARNINGS, which
will inform you of potentially dangerous procedures. The instructions in
these warnings must be followed.
Always inspect your meter and test leads for any sign of damage or
abnormality before every use. If any abnormal conditions exist (i.e.
broken test leads, cracked cases, display not reading, etc.), do not
attempt to take any measurements.
Do not expose the instrument to direct sunlight, extreme temperature
or moisture.
Never ground yourself when taking electrical measurements. Do not
touch exposed metal pipes, outlets, fixtures, etc., which might be at
ground potential. Keep your body isolated from ground by using dry
clothing; rubber shoes, rubber mat, or any approved insulating
material.
You always are careful when working with voltages above 60V dc or
30V ac rms. Keep fingers behind the probe barriers while measuring.
Never use the meter to measure voltages that might exceed the
maximum allowable input value of any function.
Never touch exposed wiring, connections or any live circuit when
attempting to take measurements.
MAINTENANCE
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Before opening the case, always disconnect test leads from all
energized circuits.
Never use the meter unless the back cover is in place and fastened
completely.
Do not use abrasives or solvents on the meter. To clean it using a
damp cloth and mild detergent only.
Qualified and trained service technicians should only perform
calibration and repair of the meter.
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•Do not attempt calibration or service unless trained and another
person capable of rendering first aid and resuscitation is present.
GENERAL DESCRIPTION
The meter is a handheld 3 1/2 digital clamp meter for measuring DC and AC voltage,
AC current, Resistance and Continuity Test with battery operated.
FRONT PANEL DESCRIPTION
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Transformer jaws
Pick up theAC current flowing through the conductor.
Hold button
When this button is pushed, the display will keep the last reading and
“ ” symbol will appear on the LCD until pushing it again.
Rotary switch
This switch is used to select functions and desired ranges as well as
to turn on/off the meter.
Back light
To use this function, press the Back light button. When this button is
pushed, the Back light of display is on. After about 3 −5 seconds, the
Back light is self-off. The Back light is on again, just push this button
once.
Display
3 1/2 digit, 7 segment, 18mm high, LCD.
“V” jack
This is positive input terminal for VOLT measurements connection is
made to it using the red test lead.
“COM” jack
This is negative (ground) input terminal for all measurement modes
except current. Connection is made to it using the black test lead.
“Ω” jack
This is the positive input terminal for ohms. Connection is made to it
using the red test lead. -3-

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MAX
This measurement function is used to measure the maximum value
of a signal. It is usable with AC/DC voltage, AC current and
resistance measurements.
To use this function, select the function and range and press the MAX
button. When this is done, the “MAX” annunciator will appear in the
display. Next, by inputting a signal, the MAX function operates. This
maximum value is held in digital memory for a long period.
To exit the MAX mode, press the MAX button once again.
Trigger
Press the lever to open the transformer. When the lever is released,
the jaws will close again.
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CLAMP METER LAYOUT
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OPERATING INSTRUCTIONS
DC VOLTAGE MEASUREMENT
1.
2.
3.
4.
Connect the red test lead to the “V” jack and the black lead to the “COM”
jack.
Set rotary switch at desired 1000V position.
Connect test leads across the source or load being measured.
Read voltage value on the LCD display along with the polarity of the red
lead connection.
AC VOLTAGE MEASUREMENT
1.
2.
3.
4.
Connect the red test lead to “V” jack and the black test lead to the “COM”
jack.
Set the rotary switch at desired 750V~ position.
Connect test leads across the source or load being measured.
Read voltage value on the LCD display.
AC CURRENT MEASUREMENT
1.
2.
3.
Set the rotary switch at desired A~ position.
Press the trigger to open transformer jaw and to clamp one conductor
only, making sure that the jaw is firmly closed around the conductor.
Read current value on LCD display.
RESISTANCE MEASUREMENT
1.
2.
3.
4.
Connect the red test lead to “Ω” jack and black test lead to the “COM” jack.
(The polarity of red lead is positive “+”.)
Set the rotary switch at desired ”Ω” range position.
Connect test leads across the resistor to be measured and read LCD
display.
If the resistance being measured is connected to a circuit
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turn off power
and discharge all capacitors before applying test probes.
NOTE:
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2.
3.
4.
If the resistance being measured exceeds the maximum value of the range
selected or the input is not connected, an overrange indication
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OL
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will be
displayed.
When checking in-circuit resistance, be sure the circuit under test has all
power removed and that all capacitors have been discharged fully.
For measuring resistance above 1MΩ, the meter may take a few seconds
to get stable reading. This is normal for high resistance measurements.
At 2000MΩrange display reading is around 10 counts when test leads are
shorted.
These counts have to be subtracted from measuring results. For example,
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when measuring 1000MΩresistance the display reading will be 1010 and the correct measuring result should be 1010
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10 = 1000 MΩ.
AUDIBLE CONTINUITY TEST
1.
2.
3.
Connect red test lead to “Ω” jack, black test lead to “COM” jack.
Set range switch to “ ” position.
Connect test leads to two points of circuit to be tested. If continuity exists,
built-in buzzer will sound.
SPECIFICATIONS
Accuracy is specified for a period of one year after calibration and at 18
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to 28
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(64°F to 82°F) with relative humidity to 80%.
GENERAL
Maximum voltage between
terminals and earth ground
: CAT II 1000V dc or 750V ac rms. (sine)
Display :LCD, 1999 counts, updates 2-3/ sec.
Polarity indication :“-”displayed for negative polarity
Overrange Indication :Only figure “OL” on the display
Jaw opening capability : 55mm (Max conductor size)
Power :9V battery, NEDA 1604 or IEC 6F22
Low battery indication :“ ” appears on the display
Operating Environment :0 to 40
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Storage temperature :-10
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to 50
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Temperature coefficient :0.1  specified accuracy) /
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( <18
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or >28
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Altitude : 2000m
Size : 282mm  104mm  47mm
Weight : Approx.500g.
DC VOLTAGE
Range Resolution Accuracy
1000V 1V ±1.0% of rdg ±2 digits
Input Impedance: 10MΩ-7-

AC VOLTAGE
Range Resolution Accuracy
750V 1V ±2.0 % of rdg ±5 digits
Input Impedance: <10MΩ
Frequency range: 40Hz to 400Hz. Response: Average responding, calibrated in rms.
of a sine wave.
AC CURRENT
Range Resolution Accuracy
200A 0.1A
1000A 1A <600A ±2.0% of rdg ±5 digits
>600A ±3.0% of rdg ±5 digits
Overload Protection: 1200A for 60 seconds maximum.
Frequency range: 50Hz to 60Hz.
RESISTANCE
Range Resolution Accuracy
200Ω0.1Ω±1.0% of rdg ±3 digits
20kΩ10Ω±1.5% of rdg ±5 digits
20MΩ10kΩ±1.5% of rdg ±5 digits
2000MΩ
1MΩ±5.0% of (rdg –10) ±10 digits
CONTINUITY
Range
Description
If continuity exists (about less than 30Ω), built-in buzzer will sound.
REPLACING THE BATTERY
WARNING
Before attempting to open the case of battery, always be sure that test leads have
been disconnected from measurement circuits. Close case and tighten screws
completely before using the meter to avoid electrical shock hazard.
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If “ ”appears on display, it indicates that the battery should be replaced. Use the
following procedure to replacing the battery:
1. Disconnect test leads from any live source, turn the rotary switch to OFF, and
remove the test leads from the input terminals.
2. The battery cover is secured to the bottom case by a screw. Using a screwdriver,
remove the screw from the battery cover and remove the battery cover.
3. Remove battery and replace with a new equivalent 9 volt battery.
4. Replace the battery cover and reinstall the screw.
ACCESSORIES
•Operator’s instruction manual
•Set of test leads
•Gift box
•9 volt battery. NEDA1604 6F22 006P type
CAUTION:
Using this appliance in an environment with a strong radiated radio-frequency
electromagnetic field (approximately 3V/m),may influence its measuring accuracy.
The accuracy can be reduced to ±(12% of reading + 6 digits).
The Clamp is used only for reading AC amperages between the receptacle and
power cord. The Clamp must be used with a Line Splitter to do this. Line
Splitters can be purchased at an electrical supply outlet.
NOTE:
Line Splitter, Item 92072 is available from Harbor Freight Tools.
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