MEWOI9300B Clamp on Leakage Current Monitoring Recorder

OEM/ODM Testing Instruments Manufacturer

  • Main Features:: 1,Measuring AC leakage current and AC current 2,Range:0.00mA-20A,3,Resolution:0.01mA,4,Clamp size:25mm×30mm,5,Data storage:3900Set
  • Model No.:: MEWOI9300B
  • Name:: MEWOI9300B Clamp on Leakage Current Monitoring Recorder

MEWOI9300B  Clamp on Leakage Current Monitoring Recorder


Click to download: MEWOI9300B User Manual

MEWOI9300B Series Three-Channel Current/Leakage Monitoring Recorder is well designed and manufactured for online measurement, monitoring and recording of Three-Channel AC leakage / current at the same time. It is composed of a tester, monitoring software, current clamp and communication cable, etc. This instrument has been widely applied the 380/220 Power system. It can provide a safety and convenience measurement with accurate results.

The instrument has a large LCD display with blue background and a large storage space. 3900 sets of data can be stored in the instrument. Three- channel current value can be display on the screen. In addition, the instrument can automatically store data at a interval, which is adjustable from 1 to 99 min.

Monitoring software provides online and real-time monitoring and historical data inquiry. With the software developed by our technical department, the users can read, inquire, store, generate and print a fitting curve and report.

The current clamp is made of a special alloy, adopts the latest CT technique and magnetic shielding technique and is not almost interfered by external magnetic field. This ensures high accuracy, high stability and high reliability of the values which are measured continuously.

Ⅱ. Technical Specification


online monitoring and recording 1 ~ 3 channel AC leakage current and current, used for circuit insulation fault troubleshooting, monitoring intermittent leakage fault, check the happen time of insulation fault and maintenance lines, etc.

Power Supply

DC 3.7V rechargeable lithium battery(full charge about 4.2V)

Test Mode

Clamp CT, true RMS

Display Mode


Current Clamp


Instrument Dimension

Host:78mm×165mm ×42mm

Current clamp 040A: 125mm×70mm×37mm


Host: 330g

Current clamp 040A: 190g

LCD Dimension

Display field:44mm×27mm

Current Clamp Model


Current Clamp Lead Cable

2 core shield wire, length 2M

Sampling Rate

2 times/second

Data storage

200,000 groups (Power down or replace battery will not lose the data)

Record Period

Set the record interval time within 1 second ~ 99 minutes, 0 seconds is not automatically stored.

Record Time

Interval time 1 seconds, can continues recording 48 hours

Interval time 10 seconds, can continues recording 120 hours

Interval time 1 minute, can continues recording 168 hours

Download Speed

60KB/ Min

Line Voltage

Below AC600V circuit test

Overflow Display

Exceed measure range overflow function: "OL" symbol display

Battery Voltage

Use 3.7V rechargeable lithium battery, power energy display with 3-grid, when the power energy is 0-grid indicate battery voltage is low, please charge in time

Rated Power

In power save mode about 6mA, Max about 35mA

Communication Interface


Record Time

In power save mode continues working 7days

Working Temperature

Working:-20℃~50℃;below 80%rh

Temperature Error

Below -10℃ or above 40℃ error influence 1%

Stored Temperature

Storage:-10℃~60℃;below 70%rh

Insulation Resistance

100MΩ or larger, 1000V

Suitable Safety Standard

IEC1010-1, IEC1010-2-032, Pollution Class 2, CATⅢ(600V),IEC61326(EMC standard)


Clamp on Leakage Current Monitoring Recorder

Click "Blue" marked MODEL view the spec

ModelRangeResolutionClamp SizeData StorgeChannelsConnection Type
MEWOI9300BMEWOI OEM/ODM  Instruments Manufacturer0.0A-500A0.1A35mm×40mm200000SetsThree-ChannelsWired
MEWOI9300MEWOI OEM/ODM  Instruments Manufacturer0.00mA-20A0.01mA25mm×30mm20000SetsThree-ChannelsWired
1-8 ChannelsWireless
MEWOI9500-140TMEWOI9500-140T.80.01.jpg0.00mA ~ 300.0A0.01mA35mm×40mm3000Sets1-8 ChannelsWireless
MEWOI9500-168TMEWOI9500-168T.80.jpg0.00mA ~ 1200A0.01mAφ68mm3000Sets1-8 ChannelsWireless

Technical Specification

Measuring AC leakage current and AC current, monitoring current in real-time manner, locating insulation faults and repairing  electrical lines.
Power source
DC6V, alkaline battery LR03 1.5V×4
Testing Method
Clamp CT, TRMS
Clamp size
Instrument Dimension
Tester(L×W×H): 75mm ×170mm ×30mm, Current clamp(L×W×H): 122mm ×70mm ×33mm
Tester: 410g (battery included),Current clamp: 170g
LCD Dimension
Display field: 44mm×27mm
Shield Type
Type B: Double shielding
Sampling Rate
2 samples/s
Data storage
3900 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 10 days at the power-saving mode
Line Voltage
Line with a voltage up to 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: -20℃~50℃;below 80%rh
Storage: -20℃~50℃;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)
Tester: 1 PCS, Current clamp: 3PCS, Instrument bag: 1 PCS, RS232 Com-cable:1 PCS; Software Disk: 1 PCS

Tester: 1 PCS, Current clamp: 3PCS, Instrument bag: 1 PCS, RS232 Com-cable:1 PCS; Software Disk: 1 PCS

After Sales