Center 262 User manual

MILLIAMP CLAMP METER
262

262-01 SEP. 2014

TABLE OF CONTENTS
1. SAFETY INFORMATION....................................................... 1
2. GENERAL SPECIFICATION................................................. 1
3. ELECTRICAL SPECIFICATION........................................... 2
3-1 Direct Voltage........................................................................ 2
3-2 Alternating Voltage ................................................................ 2
3-3 Direct Current ........................................................................ 2
3-4 Alternating Current ................................................................ 3
3-5 Resistance(Ω) ....................................................................... 3
3-6 Continuity( )........................................................................ 3
4. DESCRIPTION OF THE INSTRUMENT ............................. 4
4-1 Description of the display ...................................................... 4
4-2 Description of front and rear.................................................. 5
5. BUTTON INSTRUCTION....................................................... 6
5-1 HOLD Function...................................................................... 6
5-2 MAX/MIN Function ................................................................. 6
5-3 ZERO Function...................................................................... 6
5-4 BACKLIGHT Function ........................................................... 6
6. MEASURING INSTRUCTION ............................................... 7
6-1 ACA Measurement ................................................................ 7
6-2 DCA Measurement ................................................................ 8
6-3 ACV Measurement ................................................................ 8
6-4 DCV Measurement ................................................................ 9
6-5 Continuity Measurement........................................................ 9
6-6 Resistance Measurement.................................................... 10
7. BATTERY CHANGING ........................................................ 10
8. MAINTENANCE..................................................................... 11

Clamp Meter
1
1. SAFETY INFORMATION
Do not operate the tester if the body of meter or the test lead look
broken.
Check the main function dial and make sure it is at the correct position
before each measurement.
Do not perform resistance and continuity test on a live power system.
Do not apply voltage between the test terminals and test terminal to
ground that exceed the maximum limit record in this manual.
Keep the fingers after the protection ring when measuring through the
test lead.
Chang the battery when the symbol appears to avoid incorrect
data.
Environmental Conditions
Operation Temperature: 0°C to 40°C(32°F to 104°F); < 80 % RH
Storage Temperature: -10°C to 60°C(14°F to 140°F); < 80 % RH
Explanation Symbols
Attention refer to operation Instructions.
Dangerous voltage may be present at terminals.
This instrument has double insulation.
Approvals: EN61010 300V CAT IV
2. GENERAL SPECIFICATION
Digital Display:
4 digital liquid crystal(LCD), Maximum reading 5000.
Polarity:
When a negative signal is applied, the signal appears.
Low Battery Indication:
When the battery is under the proper operation range, will appear
on the LCD display.
Sample Rate:
2 times/sec for digital data.

Clamp Meter
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Power Source:
1.5V size AAA battery X 2
Typical battery Life: (without buzzer, backlight)
Type: 30 hours at DCA function;
60 hours at ACA and ACV function;
100 hours at DCV and Ohm function.
Auto Power Off:
If there is no key or dial operation for 30 minutes, the meter will power
itself off to save battery consumption. This function can be disabled by
press and hold the “ HOLD ” button then power the unit on
Over Load:
When the signal larger than the maximum will be show .
Maximum jaw opening:
23 mm
Dimensions:
206 x 76 x 33.5 mm
Weight:
262g (with battery)
Accessories:
Carrying case, Batteries, Test Lead & Instruction Manual.
3. ELECTRICAL SPECIFICATION
The accuracy specification is defined as ± ( percent of reading + digit )
At 23±5°C, ≦80 %RH.
3-1 Direct Voltage
Range Resolution Accuracy
50V / 300V 0.01V / 0.1V 1.0% + 2dgts
Input impedance: 1 M
3-2 Alternating Voltage (True RMS)
Range Resolution Accuracy(40~1KHz)
50V / 300V 0.01V / 0.1V 1.2% ±5dgts
Input impedance: 1 M
3-3 Direct Current
Range Resolution Accuracy
300.0mA 0.1mA
1.0% + 10dgts
3.000A 0.001A
10.00A 0.01A 3.0% + 10dgts
Influence of terrestrial magnetism: Less than ±1.0mA
Influence of CT opening and closing: Less than ±1.0mA

Clamp Meter
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3-4 Alternating Current (True RMS)
Range Resolution Accuracy(50~60Hz)
300.0mA 0.1mA
1.0% + 5dgts
3.000A 0.001A
20.00A 0.01A
3-5 Resistance ()
Range Resolution Accuracy
500 0.1
1.0% + 2dgts
5K1
50K10
500K100
3-6 Continuity
Range Buzzer Function
Ohm < 100

Clamp Meter
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4. DESCRIPTION OF THE INSTRUMENT
4-1 Description Of The Display
Auto power off indication
Polarity indication
Low battery indication
Alternative source indication
Direct source indication
Current measurement indication
Voltage measurement indication
ZERO indication
Data hold indication
Maximum indication
Minimum indication
Continuity test indication
Measurement unit
Resistance measurement indication
Measurement unit

Clamp Meter
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4-2 Description Of Front And Rear
○
1Current Sensing Clamp
○
2Safety protection ring
○
3Backlight button
○
4Clamp opening handle
○
5Function select dial
○
6ZERO button
○
7Max/Min button
○
8Data hold button
○
9LCD display
○
10 COM input terminal
○
11 Positive input terminal
○
12 Battery cabinet

Clamp Meter
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5. BUTTON INSTRUCTION
5-1 HOLD Function
It is possible to freeze the value displayed by pressing on the
"HOLD" button.
Press the "HOLD" button again to exit the Hold mode.
5-2 MAX/MIN Function
When the "MAX/MIN" button is pressed, the meter enter MAX/MIN
mode.
Press the button, to read MAX, MIN sequence. Press the button for
1 sec. or more to exit the MAX/MIN mode.
When you turn the rotary switch on the Continuity Test.
Press the "MAX/MIN" button to select Resistance measurement,
press the "MAX/MIN" button again to select continuity test with
buzzer.
5-3 ZERO Function
Press "ZERO" button to enter the Zero mode, ZERO Annunciate will
appear and Zero the display. The reading is stored as reference
value for subsequent measurement.
Press the " ZERO " button again, to exit the zero mode.
5-4 BACKLIGHT Function
When the " " button is pressed, the backlight will be turned on.
To disable the function, the button is pressed again. The backlight
will be automatically turned off about 30 seconds after it turned on.

Clamp Meter
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6. MEASURING INSTRUCTION
6-1 ACA Measurement：
With the clamp disconnected from any conductor, switch the
function selector to range.
Open the clamp by pressing the jaw-opening handle and insert the
Cable to be measured into the jaw.
Close the clamp and get the reading from the LCD panel.
Note:
Before this measurement, disconnect any test lead with the meter
for safety.
In some cases where reading is difficult, press the HOLD button and
read the result later.
CORRECT
 INCORRECT

Clamp Meter
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6.2 DCA measurement:
With the clamp disconnected from
any conductor, switch the function
selector to range.
Press "ZERO" button to enter the
zero reading.
Open the clamp by pressing the
jaw-opening handle and insert the
cable to be
measured into the jaw. Close the
clamp and get the reading from
the LCD panel.
Note:
Before this measurement, disconnect any test lead from the meter
for safety.
In some cases where reading is difficult, press the "HOLD" button
and read the result later.
6-3 ACV Measurement：
WARNING!
Maximum Input Voltage is 300V AC/DC. Do not attempt to
Take any voltage measurement that may exceed this
maximum to avoid Electrical shock hazard and/or damage to
this instrument.
Switch the main function selector
to range.
Connect red test lead to “+”
terminal and black one to the
“COM”terminal.
Measure the voltage by touch the
test lead tips to the test circuit
where the value of voltage is
needed.
Read the result from the LCD
panel.

Clamp Meter
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6-4 DCV Measurement：
Switch the main function
selector to range.
Connect red test lead to
“+”terminal and black one
to the “COM”terminal.
Measure the voltage by touch
the test lead tips to the test
circuit where the value of
voltage is needed.
Read the result from the LCD
panel.
6-5 Continuity Test With Buzzer：
Switch the main function to range.
Connect red test lead to “+”terminal and black one to the
“COM”terminal.
Connect tip of the test leads to the points where the conduction
condition needed.
If the resistance is under 100Ω, the beeper will sound continuously.
Short circuit Open circuit

Clamp Meter
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6-6 Resistance Measurement
Switch the main function to
range.
Connect red test lead to “+”
terminal and black one to the
"COM" terminal.
Connect tip of the test leads to
the points where the value of the
resistance is needed.
Read the result from the LCD
panel.
Note：
When take resistance value from
a circuit system, make sure the
power is cut off and all capacitors
need to be discharged.
7. BATTERY CHANGING
When the battery voltage drop below proper operation range the
symbol will appear on the LCD display and the battery needs to be
changed.
Before changing the battery, switch the main dial to “OFF ”and
disconnect test leads.
Open the back cover by a screwdriver.
Replace the old batteries with two new 1.5V(AAA Size) battery.
Close the back cover and fasten the screw.

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8. MAINTENANCE
WARNING!
Before open the meter, disconnect both test lead and never uses the
meter before the cover is closed.
CAUTION!
To avoid contamination or static damage, do not touch the circuit
board without proper static protection.
8-1 REMARK:
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.
When take current measurement, keep the cable at the center of the
clamp will get more accurate test result.
Repairs or servicing not covered in this manual should be performed
only by qualified personal.
8-2 CLEANING:
Periodically wipe the case with a dry cloth. Do not use abrasives or
solvents on these instruments.

MEMO:

MEMO:

MEMO:

CENTER TECHNOLOGY CORP.
4F, NO.415, Jung-Jeng Rd., Shu-Lin Dist.,
New Taipei City 238, Taiwan
TEL : [phone] E-Mail : [e-mail]
FAX : [phone] http : / / www.centertek.com
GCA000262-12000