MEWOI MEWO1000T User manual

Portable H/L Voltage Clamp Meter
MEWO1000T,MEWOI1100T
User Manual
www.mewoi.com

CONTENT
Warning.........................................................................................1
Ⅰ.Brief Introduction.......................................................................3
Ⅱ.Electrical Symbols....................................................................4
III. Series Model .........................................................................4
IV. Technical Specification .........................................................4
V. Structure ..............................................................................6
VI.LCD Display ..........................................................................7
1. LCD Display Screen ............................................................7
2. Explanation for Special Symbols...........................................7
3. Display Demonstration ..........................................................8
VII. Operation.............................................................................8
1. Power On/Off...........................................错误!未定义书签。
2. General Test.........................................................................9
3. PEAK Test................................................错误!未定义书签。
4. Data Maintenance....................................错误!未定义书签。
5. Data Memory...........................................错误!未定义书签。
6. Data Reference........................................错误!未定义书签。
7. Data Deletion...........................................错误!未定义书签。
VIII. Replacing Batteries....................................错误!未定义书签。
IX. Accessories..................................................错误!未定义书签。

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Warning
Thanks for your purchase of portable type H/L Voltage
CLAMP LEAKER of our company. In order to make better use of
this product, please make sure to:
——Read this manual in detail and the operator must
totally understand this manual and be in proficient in
operation of this meter before making test on spot.
——strictly comply with the security rules and notice
items listed on this manual.
In any case, it should pay special attention to safety in use of
this meter, particularly in measurement of circuitry with more than
AC100V and above voltages.
If the voltage of tested circuitry has exceeded 600V, it must
be used by connecting with an insulation rod.
As it is very dangerous of high voltage transmission line, the
operator must get strict training and the relevant certification on
high-pressure operation of the state before using this meter and
making a field test.
It is strictly forbidden to use this meter to test the wire with
voltage over 1KV which is without any insulation or convergence
generatrix without any insulation.
Please pay attention to marked words and symbols on panel
or backboard of this meter.
Please do not put or store this meter in the place of high
temperature, with moisture, with frozen dew or with direct
daylight irradiation for a long time.
Please note the battery polarity when replacing battery, and
remove the battery if you expect not to use this meter for a long
time.
It must be operated by qualified staff that has the
authorization on tearing down or repairing this meter.
Please do not use it when there is any damage on the

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transducer clamp or other parts of this meter.
To avoid the impact of transducer clamp, it needs to maintain
this meter regularly. Do not use corrosive or coarse materials to
clean, but use soft cloth (such as glasses cloth), dipping clean
anti-rust desiccant lubricant (such as WD-40), and making a
gentle wiping.
For the reason of this meter, in case that any danger may
occur if continue to use it, stop using it immediately and seal it
up for keeping at once, which shall be dealt with by qualified
authorization agency.
The danger symbol “ “on the meter and the manual, the
user must make safe operation according to the indication.
The extremely dangerous symbol “ ”, the user must make
safe operation according to the indication.
It suggests that this meter shall be made insulation intensity
test at least once annually. (AC3700V/rms. between insulation
pole and clamp core.)

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Ⅰ. Brief Introduction
MEWOI Series Portable Type H/L Voltage Clamp Current
Meter/ Leaker has broken through the traditional structure, with
32cm long insulating rod which is specially well-designed for
measuring high voltage current, adopting the latest CT technology
and integrated mask digital technology, portable design are fit in
the measurement of H/L voltage current, leakage current which
needs a safety distance. To choose different model can accurately
measure 0.01mA -600A or 0.1mA-1000A current or leakage
current.
MEWOI Series Portable Type H/L Voltage Clamp Current
Meter/Leaker has an innovative integrated design between
transducer clamp and transducer domain, ensuring the
high-precision, high-reliability, and high-stability on constant test
perennially. The insulating rod is portability, have the characteristic
of damp proof, high temperature resistance, shock resistance,
insulating.
MEWOI Series Portable Type H/L Voltage Clamp
Current Meter/Leaker with insulating rod can use to measure the
wire without any insulation with voltage below 1kV or convergence
generatrix without any insulation. It can also use to measure the
current of the wire with voltage below 10kV and the wire is with
insulation layer, online current testing, and have the function of
peak holding, data holding, and data storage. and its special
Clamp Leaker can make it easier for clamping or evacuating the
tested wire through pressing or pulling back the insulation rod,
time-saving and fast, widely used in transformer substation, power
plant, industrial and mining enterprises as well as the inspection
station and electrician maintenance departments for electrical
current detection and field electrical operations. It can also replace
the H/L voltage transforming ratio tester, that is, to detect the high
and low current for primary circuit and secondary circuit separately,
and then calculate to conclude the change of high and low
pressure.

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II. Electrical Symbols
Extremely Dangerous! The operator must strictly abide by
the safety rules. Otherwise, there is electric injury danger,
causing personal damage or casualty accident.
Dangerous! The operator must strictly abide by the safety
rules. Otherwise, there is electric injury danger, causing
personal damage or casualty accident.
Warning! It must strictly abide by the safety rules.
Otherwise, it may cause personal damage or casualty
accident.
Alternating Current (AC)
Direct Current (DC)
III．Series Model
Model
Range of
measurement
Accuracy
Jaw Specification
MEWOI1000T
0.0mA -1000A
0.1mA
Φ48mm
MEWOI1100T
0.00mA -600A
0.01mA
Φ33mm
IV．Technical Specification
Function
High/Low voltage AC current measurement,
leakage current measurement, on-line AC
current test, load current measurement
Power Supply
DC6V Alkaline Dry Battery (1.5V AAA X 4)
Size of jaw
Φ33mm or Φ48mm
range
0.00mA~600A or 0.0mA~1000A
Resolution
0.01mA or 0.1mA
Test Accuracy
（23°C ±5 °C ,Below
0mA~299mA: ±1%±5dgt
0.30A~49.9A: ±1.5%±5dgt
50.0A~199.9A: ±2±5dgt

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80%RH）
200A~600A: ±3±5dgt
601A~1000A: ±4%±5dgt
Frequency of
current
50/60HzAuto Identification
Insulation rod
320mm
Test Method
Clamp CT, Integral Method
Display Mode
4 digital LCD display, backlight function,
suitable for dark place.
LCD Dimension
47mm×28.5mm
Meter Dimension
76mmx255mmx31mm(Φ48mm)
68mm×245mm×40mm(Φ33mm)
Sampling Speed
About 2 times/second
Shift
Automatic Shift
Data Storage
99 Groups, during storage, the symbol
“MEM” gives indication, “FULL” mark will
flash to indicate the memory has been full.
Circuit Voltage
Test for the bare conductor below 1KV,
test the current with insulation layer below
10kV(operated with insulation rod)
Peak Maintenance
Automatically maintain the height of the test
value, usually in the test mode press PEAK
key, PEAK lights, that is, to keep open the
PEAK function, then press PEAK key to
cancel this function
Data Preservation
Under general test mode, press HOLD
button to preserve data, “HOLD” symbol
display. then press HOLD Key to cancel this
function
Data Access
“MR” symbol indicates, it can read the stored
data by turning upwards and downwards.
Overflow Display
Exceed measurement range overflow
function: “OL A” symbol display
Auto Shut Down
About 15 minutes after booting, the meter
will shut down automatically, in order to
decrease the battery consumption.
Battery Voltage
When the battery voltage is below 4.8V, the
symbol of battery voltage“ ”will show to
remind to replace battery.

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Weight
Tester: About 550g (Including battery and
rod), total quality of meter: about 1.6Kg
(including insulation rod and battery.)
Work
Temperature and
Humidity
-20°C ~40°C ; Below 80%Rh
Storage
Temperature and
Humidity
-20°C ~60°C ; Below 70%Rh
Insulation
Intension
AC 3700V/rms. (Between insulation rod and
clamp core)
Structure
Anti-Dripping Type II
V. Structure
1. Clamp
2. MEWOI1000T/1100TTester
3. LCD Display
4. PEAK Test Indication
5. PEAK Key
6. POWER Key
7. HOLD Key
8. Receiver
9. Insulation Rod Connector
10. Isolation Rod

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VI．LCD Display
1．LCD Display Screen
⑴.AC Symbol
⑵. Low battery symbol
⑶. Date storage symbol
⑷. Date access symbol
⑸. 2-digit Storage Data Serial Number
⑹. Unit Symbol
⑺. Date Locked Symbol
⑻. Decimal System Radix Point
⑼. 4-Digit LCD Digital Display
2．Explanation for Special Symbols
⑴.Low battery symbol, when the voltage of battery is
lower than 4.8V, this symbol display, please replace battery
in time.
⑵.“OL A” This symbol indicates that the current on test has
exceeded the maximum measurement limit of the meter.
⑶.“MEM” Memory mode, it will display during the data storage
process.
⑷.“Full” symbol, when the storage memory has been filled
with 99 groups of data, it will display “FULL” symbol by
flash, which means it cannot continue to store data.
⑸.“MR” data access symbol, which is displayed during
looking up data, meanwhile, it will display the serial number
of data in storage.
⑹.“End” exit symbol, it will display during the exit.

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⑺.“dEL” data delete symbol, it will display when deleting data.
3．Display Demonstration
⑴. ——The current on test
is 0.002A (2mA)
⑵. ——Locked display Data
——The data is automatic
stored as group 3
——The current on test is: 160.5A
⑶.——The current on test is: 571A
——Low battery symbol
please replace.
⑷.——Look up data of group 3 in storage
——The current on test is: 160.5A
⑸.—— “FULL” flash display:
Storage is full of 99 groups
——It can’t store more unless
delete storage
⑹.——“dEL” Indication of data delete
⑺.—— “End” Indication of exit
VII．Operation
Please check all parts of the meter carefully
before usage, to see whether there is any
damage. And make sure no damage before
usage.
According to manual instructions to install the
battery

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1. Power On/Off
Press POWER button to power on, the instrument will
displays the LCD screen, entering normal testing mode. If
LCD display is relatively dark after power on, it is possible that
battery voltage is a bit lower. Please replace battery. 15
minutes after powering on the meter, if it remains idle, an
auto-power off procedure starts to preserve the battery life and
LCD will continue flash until the complete switch off takes
place after 30 seconds. In case of LCD continuous flash,
press POWER button, then the meter will continue to work.
Under HOLD mode, press POWER button for power off.
Under general test mode, press POWER button to power off.
Under PEAK testing mode，press POWE button to
power off. Under data reference mode, firstly press POWER
button for more than 3 seconds to exit from data reference
mode, returning to normal test mode, then press POWER
button to power off. During the exit from data access, it will
display “End” symbol.
2. General Test
High voltage, extremely dangerous! It must be
operated by qualified staff that has acquired
authority. The operator must strictly abide by the
safety rules. Otherwise, there is electric injury
danger, causing personal damage or casualty
accident.
Dangerous! It cannot be used to measure the
bare conductor over 1KV voltage or
convergence generatrix. Otherwise, there is
electric injury danger, causing personal damage

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or equipment damage.
Dangerous! It cannot be used to measure the
circuit over 600A voltage. Otherwise, there is
electric injury danger, causing personal damage
or equipment damage.
General Test: In the process of test, LCD will display the
tested current value real time, and LCD data will vary with the
current change. When the tester is removed away from the
lead on test, it does not preserve the test result, LCD display
will return to zero.
In normal testing mode, it is suitable for close distance
measurement, convenient for circuit test by direct read of LCD
data.
After normal boot, place the lead in the middle of clamp
transducer domain, as shown in Figure A, with the meter
transducer domain perpendicular to the lead, pushing the
meter forwards to clamp the lead on test, showing the result
on LCD display. If showing "OL A", it means the lead current
on test has exceeded the maximum volume on the level.
Please select a higher gear level or a meter with greater
measurement limit.
To pull backwards can make the meter remove from the
lead on teat, as shown in Figure C, on removing, please try to
keep the meter transducer domain perpendicular to the lead
when moving away.
Under HOLD mode, press HOLD button to cancel HOLD
function, and return to normal testing mode.
Under data reference mode, press POWER button for
more than 3 seconds to exit from data reference mode,
returning to normal testing mode.

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Under PEAK testing mode, press POWER button to exit
from PEAK testing mode, returning to normal testing mode.
After data deletion, it will return to normal testing mode
automatically.
Attention! For the sake of safety, when test has
been finished, please remove the meter away
from the lead on test
3. PEAK Test
PEAK test: the maximum current test. The meter will make
automatic comparison on the changes in measured current,
indicating the maximum value and maintain it, when the meter
is removed away from the lead on test, the test result will be
kept consistently, suitable for the circuit test on those LCD data
hard to be read directly.
Under the normal testing mode, press PEAK button，
PEAK indication light will be bright,，enter PEAK testing mode.
That means the meter will display and automatically keep the
maximum value in the test.
Under any other mode, it must be returned to normal
testing mode, and then make PEAK testing according to the
above operation.
Press POWER button to exit from PEAK testing mode,
returning to normal testing mode, and it will display “End”
symbol during the exit.
4. Data Maintenance
Under normal testing mode, press HOLD button to keep
LCD display, “HOLD” symbol displays. Press HOLD button
again to release data lock, returning to normal testing mode,
and “HOLD” symbol disappears.
5. Data Memory
Under normal testing mode, press HOLD to storage data,
at the same time, Meter will automatically form serial numbers,
and memory the current preserved data. During the storage,
“MEM” symbol will show once by flash. This meter can
memory 99 groups of data, in case of full storage, “FULL”
symbol will display by flash continuously, and it cannot

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continue to memory until cleaning out the previous memory.
6. Data Reference
Under normal testing mode, press PEAK + POWER
button to enter data reference mode, displaying “MR” symbol,
meanwhile, it will automatically display data saved in the group
01. Then press PEAK or POWER button to read the stored
data by turning upwards or downwards in cycle. It will return to
the group 1’s data automatically after reaching the last group’s
data in storage.
Press HOLD button to exit from data reference mode,
returning to normal testing mode. During the exit, it will display
“End” symbol.
7. Data Deletion
Under data reference mode, press PEAK + POWER
button to delete all the data in storage, and return to normal
testing mode. During the deletion of data, it will display “dEL”
symbol.
VIII. Replacing Batteries
Warning! In case that the battery’s cover
board is not well closed, it is forbidden to
make test. Otherwise, it is dangerous.
Pay attention to the polarity of battery, in case
of damage to the meter.
Do not mix in the use of new and old batteries.
1. When the battery voltage is below 4.8V, the meter will
display “ ” symbol, indicating the batteries have no
sufficient power content. Please replace batteries.
2. Power off, to make sure the meter is under the state of
power off. To loosen two screws of the battery cover board,
open the cover board to replace brand-new qualified
batteries on. It should pay special attention on the battery
specification and polarity, cover the board well and fasten

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the two screws.
3. Press POWER button to check whether the meter can be
powered on normally. If not, please repeat the operation
according the step 2.
IX. Accessories
Tester
1PCS
Insulation Rod (32 mm)
1Sections
Meter Box
1PCS
Battery (Alkaline Dry BatteryAAA)
4 PCS
User’s Manual/ Maintenance Card/
Conformity Certificate
1SET

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Your Testing Specialist