MEWOI MEWOI9000G User manual

Leakage Current Monitoring Recorder
MEWOI9000G, MEWOI9000GB
User Manual
www.mewoi.com

CONTENT
Warning................................................................................................ 1
I．Brief Introduction ............................................................................. 3
II．Electrical Symbol............................................................................ 4
III．Series Model.................................................................................. 4
IV. Technical Specifications.................................................................. 4
V. Instrument Structure......................................................................... 7
VI. Instrument Operation...................................................................... 8
1 Turning on and off...................................................................... 8
2. Language Selection.................................................................. 8
3. Change Display Modes............................................................. 8
4. Selecting Power-saving Mode.................................................. 8
5. Setting Time.............................................................................. 9
6. Data Inquiry............................................................................. 10
7. Deleting Data ...........................................................................11
8. Leakage/current measurement................................................11
9．Real Time Monitoring............................................................ 13
10．Data Download.................................................................... 14
ⅦMonitoring Software Operation..................................................... 14
ⅧBattery replacement..................................................................... 15
ⅨPacking List................................................................................... 16

-1-
- 2-
Warning
Thank you for buying MEWOI9000G,MEWOI9000GB Leakage/Current
Monitoring Recorder manufactured by our company. Please keep to the
following requirements in order to use the product properly:
——Read the User Manual carefully.
——keep to the safety rules and precaution given in the manual strictly.
Pay special attention to safety when using this instrument in any case.
Observe the text and symbols attached to the front and rear panels of the
instrument.
Please replace the battery when the battery voltage low and the LCD display
is dim.
This instrument can not be turned off automatically. Please turn off it after
use.
Don not use the instrument to measure a line with a voltage higher than
600V.
It is forbidden to use the instrument when neither rear cover of the instrument
nor the battery cover is in place.
Never use the instrument when the instrument case or measuring wire is
broken and therefore any metallic part is exposed.
Don not place the instrument at a environment with high temperature, high
humidity, condensation and direct sunshine for a long time
It is necessary to maintain the instrument and clamp periodically to keep
them clean. Don not wipe the clamp by using corrosive medium or abrasive
object.
Avoid flexible bending of the clamp, so as not to cause break to the coil.
Please observe the correct polarity when replacing the battery. Remove the
battery from the instrument if you expect not to use the instrument for a long
time.

-2-
Operation, disassembly and maintenance of the instrument must be carried
out only by a authorized and qualified person.
When there is an instrument fault, never use it because continual use may
result in danger. In this case, isolate the instrument immediately and
delivered to an authorized agency for dealing with it.
The user must follow the safety instructions preceded by “ ”warning symbol
on the instrument and manual.
The user must strictly follow the instructions preceded by “ ”danger symbol
on the instrument and manual.

-3-
I．Brief Introduction
MEWOI9000G/9000GB Current/Leakage Monitoring Recorder is well
designed and manufactured for online measurement, monitoring and recording of
AC leakage / current. It is composed of a tester, monitoring software, current
clamp and communication cable, etc. This instrument has been widely applied in
many fields, such as electrical power, telecommunication, meteorology, railway, oil
fields, construction, metering, research agencies, universities, mines and
enterprises.
Both Chinese and English MMI is built in the instrument. Therefore, it is
suitable for use by engineers and technicians of different counties. The instrument
has a large LCD display with blue background and a large storage space. 4200
sets of data can be stored in the instrument. In addition, the instrument can
automatically store data at an interval, which is adjustable from 1 to 60 min.
MEWOI leakage/current monitor software provides online and real-time
monitoring and historical data inquiry. With the software developed by our
technical department, the instrument can display leakage current dynamically,
display current waveform, maximum value, minimum value and average value.
The users can preset the alarm limit. The instrument will generate an alarm when
the measured current exceeds the limit. In addition, the users can read, inquire,
store, analyze, process, sequence historical data and generate and print a fitting
curve and report.
The flexible current clamp, using the advanced Rockwell coil (or Rogowski
coil) technology, is a circular coil that is uniformly twisted on non-ferromagnetic
materials. There is no hysteresis effect, almost zero phase error, no magnetic
saturation, high linearity and strong anti-interference ability. The output signal is
the differential of the current to the time. By integrating the output voltage signal,
the input current can be reduced and the current range can be measured from mA
to 20000A. The flexible current clamp coil has no bare metal conductor,
non-contact measurement, safe and fast, it is small in size, light in weight, delicate
in appearance, suitable for a place with narrow environment and dense line. The
user can customize the length of coil according to the requirement.

-4-
II．Electrical Symbol
Extremely dangerous！The operators must keep to the safety
rules strictly; otherwise, electric shock will result in death or injury.
Dangerous！The operators must keep to the safety rules strictly,
otherwise, electric shock will result in will result in death or injury.
Warning！The operators must keep to the safety rules strictly,
otherwise, personal injury or equipment damage will occur..
Double insulation
Alternating current (AC)
Direct current (DC)
III．Series Model
Model
Range
Coil Diameter
Coil Length
MEWOI9000G
AC 0.00A～
20000A
φ300mm(300G)
1000mm
MEWOI9000GB
AC 0.00A～
6000A
φ200mm(200G)
630mm
IV. Technical Specifications
Functions
Measuring AC leakage current and AC current, on-line
monitoring and recording, locating insulation faults and
repairing electrical lines.
Power source
DC6V, alkaline battery LR6 1.5V×4
Testing
Method
Flexible Coil CT, The output signal is the differential of
current to time. By integrating the output voltage signal,
the input current can be truly restored.
Coil Diameter
φ200mm/φ300mm(Can customize to other size)
Range
AC 0.00A～6000A/0.00A～20.00kA(Can customize)
Resolution
AC 10mA

-5-
Accuracy
±2%±3dgt(The tested wire is in the center of the
flexible coil, 23℃±2℃)
Coil Length
630/950mm(Can Customize)
Current
Frequency
50Hz/60Hz (automatic recognition)
Display
Method
LCD：128dots×64dots
Instrument
Dimension
Tester(L×W×H): 75mm ×170mm ×30mm
Current clamp(L×W×H): 170mm ×70mm ×38mm
Coils
φ7.5mm(suitable for narrow environment and crowded
places)
Weight
Tester: 240g (battery included)
Flexible Coil clamp: 130-150g
LCD
Dimension
Display field: 44mm×27mm
The electric
field
interference
Has no hysteresis effect and strong anti-interference
ability.
Position error
The tested conductor should be at the center of the
flexible coil as far as possible, not near the opening. The
test error at the opening and closing points will be
increased by one time or more.
Sampling
Rate
2 samples/s
Data storage
4200 sets (data loss does not occur after power failure
or replacing the battery)
Time Setting
Recording internal adjustable from 1 to 60 min, If set to
0 min, the auto-store function is turned off
Recording
Time
Continuously operate for about 100hours at the
power-saving mode

-6-
Line Voltage
<AC600V
Overflow
Display
The “OL” symbol is displayed when a measured value is
beyond the measurement range
Battery
Voltage
A Low-Battery symbol is displayed and the user should
replace the battery with a new one when the battery
voltage drops to 4.6V to 4.8V. In this case, the
measured values are still accurate.
Rated Power
about 5mA at the power-saving mode, maximum current
consumption: 20mA
Lead Length
2 m
Temperature
and Humidity
Working: -10℃～40℃；below 80%rh
Storage: -10℃～60℃；below 70%rh
Insulation
Resistance
Higher than 100MΩ, 1000V
Safety Codes
IEC1010-1, IEC1010-2-032, Pollution Class 2, CAT
Ⅲ(600V), IEC61326(EMC standard)

-7-
V. Instrument Structure
1. Flexible Coil Current clamp interface
2. LCD（128dots×64dots, Chinese and English MMI）
3. Up, down, left, right keys and MEM control key
4. Instrument body
5. POWER key (for turning on and turning off the instrument)
6. USB data download interface
7. Flexible coil tap port A
8. Flexible coil tap port B
9. Lead shield layer
10. Audio plug
11. Output lead
12. Lock catch (Switch the arrow forward and backward to lock or open the
coil).

-8-
VI. Instrument Operation
1 Turning on and off
Turn on the instrument by pressing the POWER key. The LCD will light up.
The display on the LCD is as shown in the left figure. If the LCD display is
dim, the battery voltage may be low. If so, replace the battery with a new
one. Press the POWER key again to turn off the instrument. This
instrument can not be turned off automatically. Please turn off it after use.
2. Language Selection
Both Chinese and English MMI is built in the instrument to facilitate use by
engineers and technicians of different counties. After the instrument has
been turned on normally, select the language by pressing the LEFT and
RIGHT arrow keys, press the MEM key to confirm the selected language
and enter the measurement status.
3. Change Display Modes
After confirming the selected language and entering the measurement
status, press the LEFT and RIGHT arrow keys to change over between
measurement display modes. The measured values can be displayed in
two modes as shown in Figures A and B. Only the measured leakage
current is displayed in Fig. A. The measured leakage current, number of
stored data sets, date &time and preset storage interval are displayed in
detail in Fig. B. Press the RIGHT arrow key to change over to the display
mode as shown in Fig. B, and the LEFT arrow key to change over to the
display mode as shown in Fig.A.
4. Selecting Power-saving Mode
Press the DOWN arrow key at the measurement status to turn off the LCD

-9-
back-light and enter the power-saving mode. Press the UP arrow key to
turn on the backlight. The power consumption at the power-saving mode is
only 20 percent of the one at the common mode (the backlight is turned on).
It is recommended that the power-saving mode be adopted for long-time
online measurement and recording.
5. Setting Time
Press the MEM key at the measurement state to access the function menu,
press the UP or DOWN arrow keys to move the cursor to the Time Setting
item, and press the MEM key again to enter the date& time setting mode.
At the date& time setting mode, press the UP or DOWN arrow keys to
change values, press the LEFT or RIGHT keys to move the cursor, press
MEM key to Confirm or Cancel the setting.
After the recording interval has been set, return to the measurement state.
The instrument will automatically store the measured values at the set
interval. The instrument can store up to 4200 data sets. If the memory is
full, FULL will be displayed on the LCD. The instrument can store new data
only after some of stored data is deleted.
The instrument doesn’t have automatic clock function.
The date and time will reset to the default value (08.08 AM,
Aug 8, 2008) each time the instrument is turned on.
Press the MEM key to “Cancel” or maintain the previous
setting.

-10-
The storage interval is defaulted to “00” min each time the
instrument is turned on, that is to say, no measured value
is stored.
6. Data Inquiry
At the measurement state, press the MEM key to access the function
menu, press the UP or DOWN arrow keys to move the cursor to Data
Inquiry item, and press the MEM key to enter the inquiry submenu. Inside
the inquiry submenu, the first left line display the current page number and
total pages, the third line displays three sets of recorded values, and the
right side displays the page number increment. It is allowed to rapidly
navigate to the desired page number. Press the UP or DOWN arrow keys
to move the cursor and select the page number increment and then press
the MEM key to confirm the selection.
Press the MEM key with the cursor located at certain data set to display
the detailed information about this data set, including the set number
/stored data sets, current amplitude and recording time, etc.
Generally speaking, press the arrow keys to move the cursor and press
MEM key to confirm the selection under the inquiry submenu. The relevant
display is as shown in the following figure:

-11-
7. Deleting Data
At the measurement state, press the MEM key to access the function
menu, press the UP or DOWN arrow keys to move the cursor to “Deleting
Data” item, When press the MEM key again, a data deleting tips will pop
up. Press the MEM key with the cursor located at “OK” to delete the stored
data. Press the MEM key with the cursor at Cancel to cancel the deletion
and return to the main menu.
It is impossible to recover the deleted data. Take care to
delete any data.
The deletion operation will delete all of the stored data.
8. Leakage/current measurement
Electric shock, dangerous ！The instrument can be
operated only by the trained and authorized person. The
operators must keep to the safety rules strictly;
otherwise, electric shock will result in personal injury or
damage to the equipment.
Don not use the instrument to measure the lines with a
voltage of higher than 600V, Otherwise, electric shock
will result in personal injury or damage to the
equipment.
1) Connect the flexible coil current clamp with the instrument body properly,
turn on the instrument and enter the measurement mode.
2) Clamp the measured conductor with the current clamp (ensure that the
clamp end should be fully closed, can be locked or opened by turning
the arrow in the direction of the arrow in the structure diagram). Observe
the reading. If an OL symbol is displayed on the instrument LCD, the
measured current exceeds the upper measurement limit of the

-12-
instrument.
The conductor to be tested should be in the center position of the
flexible coil (near point A), not near the opening and closing
mouth (C area). The test error at the opening and closing mouth is
about doubled or more, and the position error near point B is
increased by about 1%.
3) When the measured current is small, the test resolution can be
improved by repeatedly wrapping the flexible coil on the wire to be
tested and then closing it a plurality of turns. For example, the
measured current is 0.01A. After the flexible coil wraps around the
tested conductor for 3 turns, the test meter displays 0.03A, and
around 5 turns, it displays 0.05A, and so on. The actual current is
equal to the meter display value divided by the flexible coil. The
number of turns around. See the legend for the reference.
Detecting the
total electricity
safety status
Multi-turn
test
Grounding
Detecting hidden
dangers of buried
wall electricity
charges
Test
equipment
operation safety
status
Detecting
ground
leakage

-13-
The current of the line is measured by clamping the live
wire or the neutral wire separately (note that clamping 1
wire).
Clamp the live & neutral wires together to measure the
leakage current of the single phase (note that clamping 2
wires).
Clamp the ground wire to measure the leakage current of
the grounding wire of the electrical equipment (note that
clamping 1 wire).
Clamp the three-phase 3-wire together to measure the
leakage current of three-phase 3-wire (note that clamping 3
wires).
Clamp the three-phase 4-wire together to measure the
leakage current of three-phase four-wire (note that
clamping 4 wires).
Clamp the three-phase 5-wire together to measure the
leakage current of three-phase 5-wire (note that clamping 5
wires).
For safety, when measuring high voltage and high current,
after confirming that the test has been performed correctly,
move the meter away from the conductor under test.
9．Real Time Monitoring
Open the host to enter the test state, connect the computer and the host
computer with a randomly configured USB communication cable, and run
the monitoring software installed in the computer. If the communication is
normal, the computer can monitor the online current in real time. If the
user fails to connect to the monitoring software, there may be a lack of
driver. Install the USB to serial port driver in the randomly configured CD
to use it normally.

-14-
10．Data Download
Connect the meter and computer with the randomly configured USB
communication cable, turn on the meter, run the monitoring software,
select the history to view, and then read the data. The more the data
storage, the longer the reading time. If the host storage is full, it takes
about 2 minutes.
ⅦMonitoring Software Operation
The monitoring software has online real-time monitoring, history query,
dynamic display, waveform indication; has maximum, minimum, and
average indication; has alarm value setting and alarm indication; has
historical data reading, reviewing, saving, sorting, generating curve,
printing and other functions. The introduction is as follows:
1. Homepage
After running the software to display the main interface, click the
“Enter” real-time monitoring interface.
The mouse cursor is in the waveform display area. Press and hold the
left mouse button to drag up or down to zoom in or out. The
monitoring data is refreshed every 0.5 seconds and monitoring can be
suspended at any time.
2. Alarm prompt
When the monitored current value is greater than the alarm set value,
the red alarm indicator flashes and the alarm set value can also be
cancelled.

-15-
3. Save waveform
Waveforms can be saved during real-time monitoring and saved in
BMP image format.
4. Historical review interface
Historical review includes: reading, saving, emptying, generating
curves, printing, ascending, descending, restoring, page turning and
other functions.
5. Historical data reading
The more historical data records, the longer the read time, and there
is a real progress indication.
6. Ascending Sequence of Historical Data
The historical leakage record values are arranged from small to large,
and if the values are the same, they are arranged in chronological
order.
7. Descending Sequence of Historical Data
The historical leakage record values are arranged from large to small,
and if the values are the same, they are arranged in chronological
order.
8. History saving
Historical data is saved in pages in TXT text format.
ⅧBattery replacement
Pay attention to the polarity of the battery, otherwise
the instrument will be damaged.
The battery is low, please replace it in time.
Cannot mix old and new batteries.
1) When the battery voltage drops to 4.8V±0.1V, the meter displays a
low battery voltage symbol, indicating that the battery is low. Please
replace the battery.
2) Press the POWER button to turn off the power, confirm that the
meter is off, open the battery cover, replace it with a new qualified
battery, pay special attention to the polarity of the battery
specification, cover the battery cover, and then turn on the power to
confirm whether the replacement is complete.

-16-
ⅨPacking List
Host
1PCS
Flexible current clamp
1PCS
RS232 Communication line
1PCS
Monitoring software (CD)
1PCS
Meter package
1PCS
User manual, warranty card, certificate
1PCS