MEWOI MEWOI7300E User manual

MEWOI7300E
DC Clamp Leaker
www.mewoi.com
MEWOI 7300E

CONTENT
Warning.......................................................................................................1
I. Introduction .............................................................................................2
II. Range and Accuracy............................................................................2
III. Electrical Signs.....................................................................................2
IV. Technical Specifications......................................................................3
V. Structure of the Leaker ........................................................................4
VI. LCD Display.........................................................................................4
VII. Operating Method ..............................................................................4
1. Start-up, Shutdown .............................................................4
2. Leaker Measurement..........................................................5
3. Peak Holding ......................................................................6
4. Hold, Storage andAccess Reading.....................................6
VIII. How to Change Battery....................................................................6
IX. Accessories..........................................................................................7

-1-
- 2-
Warning
Thank you for purchasing our company's MEWOI7300E DC Clamp Leaker,
for better use of this product, please:
——Read carefully the user's manual.
——Follow strictly safety rules and notes listed in this manual.
Under any circumstances, please pay special attention to your safety in the
course of using this leaker.
Give heed to label texts and symbols on panel and back plate of this leaker.
Do not input current more than 7A, the tester measurement cannot exceed 7A,
and no OL symbol indicates.
After power on, please calibrate zero before measuring.
Please don't place and store this leaker in hot and humid condition, locations
with moisture condensation and under direct sunlight for a long time.
In case voltage of battery was low, please replace batteries.
If you expect not to use the leaker for a long time, please take out batteries.
When changing batteries, please pay attention to the polarity of battery.
Use, disassembly and maintenance of this leaker shall be operated by
authorized personnel.
In case dangers would occur if continue to use a faulty leaker, please stop to
use it and seal it for safekeeping immediately; and then, send it for disposal of
authorized agency.
Users shall carry out operation based on danger signs “ ” on leaker and
manual.
Users shall carry out safety operation based on instructions listed in this
manual, e.g. “ ” and danger signs on this manual.

-2-
I. Introduction
MEWOI7300E DC Clamp Leaker is specially designed for measurement of DC
leakage current，DC low current; which resolution can reach 0.1mA, by adopting
up-to-date CT technology and digital integration technology, it is a product with
relatively small size, high accuracy and perfect function compared with similar
leakers in the world. The leaker could be widely applied in those fields as
electricity, communications, meteorology, railroad, oilfield, construction,
measurement, scientific & research teaching institutes, industrial and mining
establishments, the car circuit maintenance.
Clamp core of this DC Clamp Leaker adopts high magnetic alloy; in addition, with
utilization of multilayer shielding technology, it is almost free from influences of
external magnetic field so as to ensure high precision, high stability and high
reliability of perennial continuous measurement. it is an essential tool for
electrician safety testing.
MEWOI7300E DC Clamp Leaker also named：High Accuracy DC Clamp
Leaker, Car DC Clamp Leaker. This DC Clamp Leaker obtains one USB
interface. With the help of the software that we provide, many functions are
available. For example, on-line monitoring, historical data inquiry，active curve
drawing. There are also functions like saving to documents and printing when
connected to PC. It also has functions such as peaking holding, data holding, data
storage and adjust zero.
II. Range and Accuracy
Function
Measure Range
Accuracy
Resolution
DC current
0.0mA～6.00A
±2%rdg±5dgt
0.1mA
(Condition: 23℃±5℃，below 75%rh,wire in the center of the jaw)
III. Electrical Signs
Extremely dangerous! Operators shall strictly keep to
safety rules; otherwise there would be dangers of electric
shock to cause personal injuries or casualties.
Dangerous！Operators shall strictly keep to safety rules;
otherwise there would be dangers of electric shock to
cause personal injuries or casualties.

-3-
Warning！Operators shall strictly keep to safety rules;
otherwise personal injuries or equipment damages might
be caused.
Double insulation
AC
DC
IV. Technical Specifications
Function
Measurement of DC leakage current, DC current,
car leakage
Power
Zn-Mn dry battery,6F22,9V DC，continuous use for
60 hours
Test Mode
Clip-on CT，Magnetic modulation
Clamp Size
25mm×30mm
Range
0.0mA～6.00A DC
Resolution
0.1mA DC
Accuracy
（23℃±3℃，below
70%RH）
0.0mA～300.0mA DC: ±2%rdg±5dgt
0.30A～6.00A DC: ±2%rdg±5dgt
Shield Type
Double shielding
Display Mode
Four digits LCD display
Dimension
LWH: 175mm×70mm×38mm
LCD Dimension
35mm×21.5mm; display domain:32mm×15mm
Sampling Rate
About 2 times/s
Range Shift
0.0mA～6.00A DC Automatically
Zero-Adjustment
Yes，calibrate zero before measuring
Polarity
Indication
Auto identified and display“—”
Test Position
Tested wire in the jaw center
Line Voltage
600V DC
USB Interface
Data stored in the memory of the meter via USB
upload to PC, or on-line monitoring
Data Memory
99units，FULL blinks when the memory is full
Peak Hold
Push HOLD without release, the meter will show the
peak value during the pushing period
Reading Hold
DH indicating the reading is hold
Out of Range
OL indicating the current is out of range
Auto Power-off
5 Minutes after power on, it will power off
automatically to lower the power consumption
Battery Voltage
Indicating the battery voltage is lower than

-4-
7.2V.Then the battery have to be changed
Weight
120g（including the battery）
Working Current
20mA
Limit
Temperature
Error
-10℃～0℃及 40℃～50℃，within 2%rdg
Temperature
and Humidity
Working: -10℃～50℃,below 80%rh
Storage: -10℃～60℃,below80%rh
Insulating
Strength
AC3700V/rms(between the alloy of the clamp and
the housing)
Applicable
Safety Rules
IEC1010-1、IEC1010-2-032、Pollution degree 2、
CAT Ⅲ(600V)
V. Structure of the Leaker
1. Clamp(25mm×30mm)
2. DC current positive input indication
3. Upper Cover
4. Totoid Opening Lever
5. POWER key
6. HOLD Key
7. ZERO Key
8. LCD
9. USB Interface
10. Back cove 11. Battery cover
VI. LCD Display
1. DC indication
2. AC indication
3. AC indication
4. Low battery symbol
5. Data hold indication
6. Stored data code
7. Unit of current indication
8. Value of current
VII. Operating Method
1. Start-up, Shutdown
Press POWER key to start up, LCD will begin to display; Press the POWER
key again, the leaker will shut down. After starting up for 5 minutes, LCD will
flick notes that the leaker will shut down automatically; after flickering for 30s,
it will shut down formally to reduce battery consumption. In case you have
pressed POWER key when LCD was flickering, the leaker will continue to
work for 5 minutes. If LCD was very dark after starting up, it might be caused
by low-voltage battery, in this case, please change battery immediately.

-5-
2. Leaker Measurement
High voltage, extremely dangerous! Operators shall
strictly observe safety rules; otherwise there would be
risk of electric shock to cause personal injuries or
casualties.
Dangerous！Please don’t use it to measure current
higher than 300A; otherwise there would be risk of
electric shock to cause personal injuries or equipment
damages.
1）Power on.
2）Close to the measured conductor, press the ZERO key to clear
3）Press down trigger to open clamp head and clamp to-be-measured
conductors. (Be attention that clamp heads must be totally closed)
Clamp live wire and null line together is to measure
leakage current of electrical equipment. (Note: 2
lines)
Clamp earth wire is to measure grounding line
leakage current of electrical equipment.
(Note: single line)
Clamp main line is to measure total current of that
main line.（Note: single line）
Note! In order to ensure the accuracy of
measurement, before every measurement, close
to the wire, adjust zero, and then clamp into
the current line to test.
4）Read LCD display data. In case OL mA symbol was displayed, it means
that current of measured line is beyond the maximum limit of this leaker;
with this case, please shift gear with much higher range limit.
In locations with difficulty to read out data, please
use the data holding function. If [DH] symbol
displayed, please discharge data holding state

-6-
first, and then do the test.
Do not test DC current exceed 7A，When the input
current is more than 7A, the meter reading may
become small, and does not display
the overrange
OL symbol.
3. Peak Holding
Pressing HOLD key continually in the course of measurement (More than 3
seconds), the leaker will capture current peak values of lines in this period
of time; release the key, it then will return to measuring state.
4. Hold, Storage and Access Reading
1）Pressing HOLD key for a short time in the course of measurement (less
than 3 seconds), DH symbol will display, the leaker will hold current
measuring data and automatically stored in the memory with a unit ID;
press HOLD key again to release the hold state, and the leaker
continues its measuring; in case stored data reached to 60 groups,
press HOLD key again, the “FULL” symbol will display, which means
storage memory is full; press HOLD key to cancel “FULL” flickering and
return to measuring mode.
2）Press HOLD+POWER keys to enter into data access mode and display
Unit 1 storage data automatically; and then press HOLD key again to
turn the page of stored data; NULL will display when there is no data in
stored in the memory, press POWER key to exit data access mode.
3）After entering into data access mode, press HOLD key for more than 3
seconds will clean up all stored data; when the leaker displaying “dEL”
symbol, it means that it has finished cleanup process, and then return to
measuring state automatically.
VIII. How to Change Battery
Warning! It is dangerous to carry out test when the
battery cover plate was not on its position.
Please pay attention to the polarity of battery to
avoid damaging the leaker.
Chang the low battery in time
If you expect not to use the meter for a long time,
please get off the battery to storage.
1）“ ” symbol means the battery is undercharge and need to be replaced.
2）Press POWER key to shut down the leaker; before opening the battery cover,
please confirm the leaker is in off position, and then replace with qualified
new battery; special attention shall be paid to the polarity of battery; at last,
cover battery cover plate.

-7-
IX. Accessories
Clamp tester
1 pc
USB Com cable
1 pc
Software
1 disk
User Manual
1 copy
Warranty card / Certification
1 copy

Your Testing Specialist