MEWOI 7800 User manual
MEWOI 7800
HIGH ACCURACY CLAMP LEAKER
USER MANUAL
www.mewoi.com
CONTENT
Warning...................................................................................................1
I Introduction...........................................................................................3
II Electrical Signs....................................................................................4
III Technical Specifications....................................................................5
IV Structure of the Leaker.....................................................................7
V Operating Method ..............................................................................8
1.Start-up, Shutdown........................................................................8
2.Leaker Measurement .....................................................................8
3. Peak Holding ..............................................................................11
4. Hold, Storage andAccess Reading.............................................11
VI Function Quick Look Up.................................................................12
VII Display Example and Meaning....................................................13
VIII How to Change Battery................................................................14
IX Accessories......................................................................................15
-1-
- 2-
Warning
Thank you for purchasing our company's High Accuracy 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.
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.
-2-
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.
Please use mA to test leakage current (test by clamping grounding line,
single-phase line together).
-3-
I Introduction
MEWOI7800 High Accuracy Clamp Leaker is specially designed for
measurement of AC leakage current; by adopting up-to-date CT technology
and digital integration technology, it is a product with relatively small size,
large clamp, 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. Clamp core of this High Accuracy Clamp Leaker adopts
special alloy; in addition, with utilization of magnetic 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.
This High Accuracy 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,
-4-
indication of max, min and average value and indication. There are also
functions like saving to documents and printing when connected to PC. It is
an essential tool for electrician safety testing.
II 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.
Warning！Operators shall strictly keep to safety rules;
otherwise personal injuries or equipment damages might
be caused.
Double insulation
AC
DC
-5-
III Technical Specifications
Function
Measurement of AC leakage current, AC
current and on-line measurement
Power
Zn-Mn dry battery,6F22,9V
Size of jaw
Φ68mm
Test Mode
Clip-on CT，integral mode
Display Mode
Four digits LCD display
Dimension
Width ×Height×Thickness：
175mm×70mm×38mm
LCD Dimension
35mm×21.5mm；display domain：32mm×15mm
Sampling Rate
about 2 times/s
Frequency
50/60Hz Automatically
Range Shift
Automatically
Accuracy
（23℃±3℃,
below 70%RH）
0.00~59.9A: ±1.5%±5dgt
60.00A~199.9A: ±2%±5dgt
200.0A~599A: ±3%±5dgt
600A~1200A: ±4%±5dgt
Voltage Range
AC600V
USB Interface
Data stored in the memory of the meter via
USB upload to PC, or on-line monitoring
-6-
USB line
1.5m
Storage
99units，all used when display 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 then
7.2V.Then the battery have to be changed
Weight
120g（including the battery）
Consumption
About 15mW
Temperature
and Humidity
Working: 0℃~ 40℃,below 80%rh
Storage: -10℃~60℃,below 70%rh
Insulating
Strength
AC2kV/rms (between the alloy of the clamp
and the housing)
Applicable
Safety Rules
IEC1010-1、IEC1010-2-032、pollution, etc 2、
-7-
CAT Ⅲ(600V)
IV Structure of the Leaker
1. Double Input Totpid
2. Upper Cover
3. Totoid Opening Lever
4. HOLD Key
5. POWER key
6. LCD
7. USB Interface
8. Back cover
9. Screw of up/down cover
10. Battery cover
11. Screw of battery cover
Table of contents
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