Center 212 User manual

1000
600
1000
600V
750
1000
40
400
600
A
PEAK
1mS
V
Hz
REL
1000
HOLD
AC\DC CLAMP METER
212 True Rms

CONTENTS
TITLE PAGE
I. Safety Information ………………………………………...1
Environmental Conditions……………………………………….….1
Explanation of Symbols……………….……………………………. 1
II. Specification…………………………………………………...2
General Specification……………………...………………………... 2
Electrical Specification……………………………...……………… 2
III. Instrument Familiarization…………………………..3
Symbol Definition……………………………………………………. 4
Part and Position……………….…………………….…………….... 4
IV. Measuring Instruction……………………………...…. 5
4.1 Current Measurement…………………………...……………...…….. 5
4.2 Voltage Measurement…………………………………...……………. 6
4.3 Resistance Measurement……………………………...…………..… 8
4.4 Continuity Test……………………………………………………..…...9
Diode Test…………………………………………………………….. 10
4.5 Frequency Measurement from the Terminals……………………... 11
4.6 Frequency Measurement with the clamp…...………………………12
4.7 Button operation……………………………………………………….13
V. Battery Changing………………………………………… 14
VI. Maintenance…………………………………...…………….. 14

1
I. Safety Information – Read first
•Read the user manual before use and follow all safety information.
•Use the meter only as specified in this user manual. Otherwise
meter protection may be impaired.
•Never use this meter on a circuit with voltages greater than
750Vrms @ 50/60 Hz.
•Do not operate the meter if the body or tests leads look damaged.
•Check the function selector range switch and make sure it is at the
correct position before each measurement.
•Do not perform resistance and continuity test on a live circuit.
•Exercise extreme caution when measuring live systems with
voltage greater than 60V DC or 30V AC.
•Use extreme care when working around bus bars and bare
conductors.
•Do not use the meter in over range/overload conditions (OL).
•Change the battery when the symbol appears to avoid
erroneous readings.
Environmental Conditions:
Altitude up to 2000 meters.
Operating temperature:
0°C ~ 40°C, <80% RH, non-condensing
Storage temperature: - 10°C ~ 60°C, <70% RH, battery removed
Pollution Degree: 2
Installation Categories III (600V), II (1000V)
Explanation of Symbols:
Attention! Refer to operation Instructions.
Dangerous voltage may be present at terminals.
This instrument has double insulation.
When servicing, use only specified replacement parts.
Approvals:EN61010 600V CAT III 1000V CAT II

2
II. Specification
General Specification:
Digital Display: 3 3/4 digits LCD display with maximum reading 3999
Analog Display: Fast 40 segment analog bar graph display
Symbol and Scale range:
Automatic display according symbols and range input signal
Polarity: Displayed when negative signal applied to the input
Over Load:
is Displayed when input signal exceeds measuring limit in 40A,
400A, resistance and continuity range.
In voltage, current and frequency range, this symbol will not be shown
even the read reach the measuring limit. The measuring limit of these
ranges are : ACV : 750V DCV : 1000V
DCA : 1000A ACA : 1000A Hz : 10KHz
Sample Rate: 2 times/sec for digital data; 20 times/sec for analog bar
Low Battery Indication:
displayed when the battery is below the required voltage
Power Source: 9V, NEDA1604 or 6F22 or 006P
Battery Life: 33 hrs typical at Amp, Hz function
65 hrs typical at ,function
100 hrs typical at V, Ωfunction
Auto Power Off:
The meter will power itself OFF if there is no push button or rotary
switch operation for 30 minutes.
To deactivate this function, press the “MAX MIN” button and keep it
pressed down. Then power up the clamp.
Clamp opening size: 40mm
Dimension (L x W x H) :242 x 66 x 36 mm, 9.53 x 2.60 x1.42 inch
Weight: 400g, 14.10OZ (battery included)
Accessory: Instruction Manual, Carrying Case, Test lead, 9V Battery
Electrical Specification:
The accuracy specification is defined as ±( …%reading＋…count ) At
23±5℃, ≦80 %RH
True RMS for ACV and ACA accuracy are specified from 5% to 100% of
range. accuracy add ±(1%rdg) on Crest Factor 1.4<CF<3 at full scale &
CF<6 at half scale.
(Alkaline)

3
ACA
Range Resolution Accuracy Overload Protection
40A 0.01A
400A 0.1A
1000A 1A
50 ~ 60Hz
±
( 1.9%rdg + 5dgts )
60 ~ 500Hz
±
( 2.5%rdg + 5dgts )
1200Arms
DCA
Range Resolution Accuracy Overload Protection
40A 0.01A
400A 0.1A
1000A 1A
±
( 2.5%rdg + 10dgts ) 1200Arms
ACV (Autorange)
Range Resolution Accuracy Input Impedance Overload Protection
400V 0.1V
750V 1V
±
( 1.5%rdg + 5dgts )
50 ~ 500Hz 10 M
Ω
1200Vpp
DCV (Autorange)
Range Resolution Accuracy Input Impedance Overload Protection
400V 0.1V
1000V 1V
±
( 1%rdg + 2dgts ) 10 M
Ω
1200Vpp
Ohm ( Resistance ) (Autorange)
Range Resolution Accuracy Overload Protection
400
Ω
0.1
Ω
4000
Ω
1
Ω
±
( 1%rdg + 3dgts ) 600Vrms
(
Diode
)
Range Test Current Overload Protection Open Circuit Voltage
1.7mA Max. 600Vrms 6V Max.
Continuity ( )
Range Active Region Overload Protection
<100
Ω
600Vrms
Frequency (Hz) (Autorange)
Function Range Resolution Sensitivity Accuracy
4KHz 1Hz 2Arms
A-Hz
10KHz 10Hz 5Arms
±
( 0.1%rdg + 1dgt )
(20~10KHz)
4KHz 1Hz 5Vrms
V-Hz
10KHz 10Hz 10Vrms
±
( 0.1%rdg + 1dgt )
(10~10KHz)

4
III. Instrument Familiarization:
Symbol Definition:
Part and Position :
Polarity indication
Direct Source indication
Low battery indication
Relative indication Positive Peak detect indication
Alternative
Auto Power Off indication
Continuity with beeper
Diode function indication
Negative Peak detect indication
Data Hold indication
Manual range indication
Resistance measurement indication
Voltage & Current measurement indication
Frequency Measurement indication
Analog Bar display
600V
1
2
3
6
9
10 11
5
8
7
4
600
1mS
PEAK
1000
HOLD
400
A1000
40
V
Hz
REL
600
1000 1000
750
○
1Current Sensing Clamp
○
2Clamp opening handle
○
3Function select dial
○
4Hold Button
○
5Peak Hold Button
○
6Maximum Minimum Button
○
7AC/DC Select Button
○
8Relative Button
○
9LCD Display
○
10 “COM” Terminal
○
11 “ + ” Te st Te r mi n a l

5
600
1000
600V
1000
400
40
600
1mS
PEAK
A
750
1000
V
Hz
REL
1000
HOLD
IV. Measuring Instruction:
4.1 Current Measurement:
Switch the main function selector to proper current range.
ACA
Open the clamp by pressing the jaw-opening handle and insert the
cable to be measured into the jaw.
Choose AC current measurement by pressing the AC/DC button for
ACA reading.
DCA
To measure DC current, choose DC measurement by pressing the
AC/DC button. Wait for the reading to stabilize then press REL button
to null the reading. After these are done, insert the cable to be
measured into the jaw and read the value.
Note:
Before this measurement, disconnect the test lead with the meter for
safety.
In some occasion that the reading is hard to read, push the HOLD
button and read the result later.
CORRECT
INCORRECT
(2wiresinside)
HOLD
1000
750
1000
600
600V
40
A
400
1000 V
600
1mS
PEAK
1000
REL
Hz

6
4.2 Voltage measurement:
Switch the main function selector to voltage range.
Connect red test lead to “+” terminal and black one to the “ COM ”
terminal. Choose AC or DC by pressing the AC/DC button.
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.
1000
400
40
600
1mS
PEAK
AV
Hz
REL
1000
HOLD
600
1000
600V
600
1000
ACV measurement

7
1000
600
600V
1000
600
Hz
REL
1000
PEAK
A
40
400
600
1mS
V
1000
HOLD
DCV measurement

8
4.3 Resistance measurement:
Switch the main function to “ ” range, check the power line is
disconnected from the system .
Connect red test lead to “+” terminal and black one to the “ COM ”
terminal.
Connect tips 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.
600V
1000
600 600
1000
PEAK
1mS
400
40
A
REL
Hz
1000 V
600 1000
HOLD

9
CAT
CAT
V
V1000
600 III
II
600V
V
V
1000
600
HOLD
REL
600
PEAK
A
40
400
1mS
1000 V
CATVIII 1000 A
Hz
4.4 Continuity Test:
Switch the main function to ” ” range, check the power
line is disconnected from the system.
Connect red test lead to “+” terminal and black one to the “ COM ”
terminal.
Connect tips of the test leads to the points where the conduction
condition needed.
If the resistance is under 100Ω, the beeper will sound continuously.
Beeper
²Short circuit ²Open circuit
CAT
CAT
V
V1000
600 III
II
600V
V
V
1000
600
HOLD
REL
600
PEAK
A
40
400
1mS
1000 V
CATVIII 1000A
Hz

10
Diode Test:
Switch the main function to ” ” range, check the power
line is disconnected from the system.
Connect red test lead to “+” terminal and black one to the “ COM ”
terminal.
Connect tips of red test lead to the anode side and black test lead to
the cathode side of the diode being tested.
Read forward Voltage (Vf) value from the LCD panel.
If the polarity of test leads are reversed with diode polarity, the digital
reading show “OL”. This can be used for distinguishing anode and
cathode terminal of a diode.
600
PEAK
V
1000
600
1mS
V
V
III
II
600V
V
CAT
CAT
600
1000
HOLD
IIIVCAT A1000
Hz
V
400
A1000
40
REL

11
4.5 Frequency measurement from the terminals:
Switch the main function to “Hz ”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 frequency of the
voltage signal is needed.
Read the Result from the LCD panel.
1000
600
600V
1000
600
PEAK
1mS
400
40
A
REL
Hz
1000 V
600 1000
HOLD

12
4.6 Frequency measurement with the clamp:
Switch the main function selector to“Hz ”range.
Open the clamp by pressing the clamp-opening handle and insert the
cable to be measured into the clamp.
Close the clamp and get the reading form the LCD panel.
Note:
When doing frequency measurement, user should either use the
terminal signal or clamp signal but not both. If both sources are
applied an error reading will occur.
1000
750
600V
1000
600
PEAK
1mS
400
40
A
REL
Hz
1000 V
600 1000
HOLD

13
4.7 Button Operation:
Data Hold Function:
At any time, the user can hold the present reading by press the
“Hold” button and release the held data by press it again.
Peak Hold Function:
This meter is built with 1ms peak hold function at ACA, ACV, DCA
and DCV ranges.
Before the user wants to perform a peak hold operation, he must
finish calibration process at first.
To invoke the calibration operation, the user must press and hold the
peak button for 2 seconds. After that “CAL” will display on the LCD
and the offset will be calculated and kept in the meter.
After the calibration the user can choose P+ or P- by press peak hold
button to keep the peak reading. Press the peak button for 2 seconds
will return the meter back to normal operation.
Once the function range is changed, the meter will need another
calibration for peak measurement.
MAX/MIN Function:
Press the “ MAX/MIN ” button once will set the meter to MAX mode.
Press it once again will set the meter to MIN mode.
Press it once again and meter will display the present reading and
still keep track of the MAX and MIN change. This mode will also
indicated by blinking “ MAX MIN ” symbol.
Press the “ MAX/MIN ” button for more than 2 seconds will set the
meter back to normal operation.
REL Function:
Press the “REL” button will change the zero to the present reading
and the relative value will show on the LCD.
Press it once again and meter will display the relative zero point. This
mode will also indicated by blinking “REL” symbol.
Press the “REL” button for more than 2 seconds will set the meter
back to normal operation.

14
V. Battery Changing:
1.When the battery voltage drop below proper operation range the
symbol will appear on the LCD display and the battery needs to be
changed.
2.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 a new 9V battery.
3.Close the back cover and fasten the screw.
VI. 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.
*REMARK:
yIf 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.
yWhen take current measurement, keep the cable at the center of the
clamp will get more accurate test result.
yRepairs or servicing not covered in this manual should be performed
only by qualified personal.
*CLEANING:
Periodically wipe the case with a dry cloth. Do not use abrasives or
solvents on these instruments.

CENTER TECHNOLOGY CORP.
4 / F NO. 415, Jung-Jeng Rd., 238 Shu-Lin, Taipei, Taiwan
TEL : [phone] E-Mail : [email protected]
FAX : [phone] http : / / www.centertek.com
212-00