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G81 Universal Single-Axis Gaussmeter / Teslameter

●  Measurement range up to 100kG(10T)
●  Peak-to-Peak Noise <0.05G
●  DC Accuracy 0.8%
●  Frequency Response DC- 10kHz
●  Bypass Zero Technology
●  Gallium Nitride (GaN) Hall Sensor.
●  AC magnetic field measurement (RMS)
●  Max/Min/Hold Function
●  S or N Polar indication



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COLIY®--Excellent Solution for Magnetic  Field Measurement

High Magnetic Field (0-20T) Measurement

Model

Principle

Type

Axis

DC Accuracy

Range

Resolution

G80

HALL

Handheld

1

2%

2T

10μT

G81

HALL

Handheld

1

0.8%

10T

1μT

G93

HALL

Handheld

3

1%, 0.5%

20T

10μT

G401

HALL

Desktop

1

0.05%

20T

1μT

X113

HALL

Sensor

1

0.05%

15T

TC of sensitivity: 30ppm/K

Low Magnetic Field(0- 2mT) Measurement

Gaussmeters for Low Magnetic Field

Model

Principle

Type

Axis

DC Accuracy

Range

Resolution

GF601

Fluxgate

Handheld

1

0.5%

1mT

0.1nT

GF603

Fluxgate

Handheld

3

0.25%

1mT

0.1nT

Note: 1T= 10kG; 1mT= 10G;  1μT= 10mG;   1nT= 10μG



G81 Universal Single-Axis Gaussmeter / Teslameter

Description

G81 Gaussmeter (magnetic field meter) is a high-performance handheld single-axis gaussmeter using COLIY's third-generation semiconductor gallium nitride (GaN) Hall sensor. Gallium nitride sensor has the characteristics of good temperature stability, unaffected by light, high linearity, and low noise, and its performance is ahead of the second-generation semiconductor gallium arsenide (GaAs) sensor technology.

The Gaussmeter needs to be calibrated frequently during startup and measurement, which is inconvenient to operate and affects accuracy.G81 Gaussmeter adopts Bypass Zero Technology and high-stability GaN hall sensor, no need to zero, which greatly improves the accuracy of the data andthe convenience of use. G81 also has extremely low measurement noise that is unique in a handheld gaussmeter. The peak-to-peak noise within 60 seconds is less than 0.05G. It can easily measure the metal materials’ remanence and even measure the earth's magnetic field (see dcoument: Application G81 gaussmeter used in Geomagnetic Survey).

The DC accuracy of Gaussmeter G81 is better than 0.8%, the measurement range is up to 100kG (10T), and the frequency response range is DC-10kHz. Gaussmeter G81 uses Fourier analysis method to measure AC magnetic field (RMS value and spectrum analysis), which is very suitable for measuring AC magnetic field of various waveforms (sine wave, square wave, triangle wave, trapezoidal wave, sawtooth wave, etc.). The Gaussmeter G81 uses a 3.2-inch color industrial resistive touch screen and a menu and display that conform to the smart phone habit. It is easy to operate, and users can use it without reading the manual. The Gaussmeter G81 is powerful, with maximum/ minimum functions and magnetic field polarity display function, storage function,real-time spectrum analysis function and 0.2ms pulse magnetic field capture function.

G81 could be equipped with many different kinds of Hall Probes: Transverse Probe, Axial Probe, Small-diameter Axial Probe (Diameter2mm), Ultra-thin Probe (thickness of 0.5mm) and Probe with temperature compensation. The typical temperature coefficient of ordinary probes (probes without temperature compensation) is ±300ppm/, but typical temperature coefficient of probes with temperature compensation is only ±50ppm/, so probes with temperature compensation are strongly recommended for better precision and stability whenthe temperature changes.

 

 

Features                

●  Bypass Zero  Technology                

●  GUI  Operation System                

●  Gallium  Nitride (GaN) Hall Sensor.                

●  3.2 inches  color touch LCD                

●  AC magnetic  field measurement (RMS)                

●  Max/Min/Hold  Function                

●  S or N  Polar indication                

●  Real-time Spectrum Analysis  Function                

●  Host storage capacity >6000  data                

●  Measurement  range up to 100kG(10T)                

●  Peak-to-Peak  Noise <0.05G                

●  DC Accuracy  0.8%                

●  Frequency  Response DC- 10kHz                

●  Temperature  Coefficient up to ±50ppm/                

●  Small-diameter  Axial Probe (Diameter 2mm)                

●  Ultra-thin  Probe (thickness of 0.5mm)                

●  0.2ms Pulse  Magnetic Field Capture Function                

●  AC magnetic  field as low as 0.5Hz                

 


               

 
 

Bypass    Zero Technology                

                 

During the use of an ordinary gaussmeter, the host and probe will has zero drift due to changes in temperature and hysteresis. Therefore, the probe must be frequently placed in the zero-gauss chamber for zero calibration.                

The Gaussmeter G81 adopts unique Bypass Zero Technologyand high stability GaN Hall sensor. Both the host and probe have low zero drift error and extremely low noise. Temperature and hysteresis do not affect the zero drift of the gaussmeter. There is no need for zero calibration, which greatly improves the accuracy and convenience of use.                

GaN Hall Sensor                

GaN materials have the characteristics of strong atomic bonds, high thermal conductivity, good chemical stability and strong radiation resistance. GaN is known as the third-generation semiconductor materials, after the first generation of Ge, Si semiconductor materials and the second generation of GaAs, InP semiconductor materials.                

COLIY's third-generation semiconductor gallium nitride (GaN) Hall sensor has the characteristics of good temperature stability, high linearity and low noise, and its performance is ahead of the second-generation semiconductor gallium    arsenide (GaAs) sensor technology.                       


               

               

Smart Record and Review                

                 

Smart Record: Users can choose any time period and time interval, and can add remarks for each record. The host storage capacity is greater than 6000 data.                

Smart View: Provides a detailed record list, and users can view the details of each measurement data. Click any record list, the user can see the complete storage information, the display format of this information is similar to the screenshot display.                 

               Real-time Spectrum Analysis

                 

For AC magnetic field, G81 Gaussmeter has real-time spectrum analysis function, and the spectrum analysis range is <10kHz.                

                 

Using Fourier analysis of 20Hz-10kHz AC magnetic field, the screen will display the 2 largest magnetic field peaks and frequency values.                


               


               

               


               

                    Pulse Mode   

             

The digital sampling frequency of the G81P Gaussmeter is as high as 100k/s, so it can capture the pulsed magnetic field with a time width of ≥0.2ms, and the maximum pulsed magnetic field value is up to 10T.                

This is ideal for measuring magnetizers and other fast pulsed magnetic field applications.                

Temperature Compensation   

             

The typical temperature coefficient of ordinary probes (probes without temperature compensation) is ±300ppm/, but typical temperature coefficient of probes with temperature compensation is only ±50ppm/, so probes with temperature compensation are strongly recommended for better precision and stability when the temperature changes.                


               


               

               


               


               

3D Movement Platform 

               

3-Direction Precision Movement Platform, is made of non-magnetic material. Users fixed the probe on the bracket front-end, and then manually rotate the knob so that the probe moves stably along the X, Y, Z-axis to a certain position and lock fixed. Maximum stroke of each axis is 150mm, and positioning accuracy is 0.1mm.                


               

               

             Metal Protector of Probe 

                

All probes of COLIY gaussmeter are protected by non-magnetic metal protectors (protective sleeves).                

The non-magnetic metal protector can be tightened with the probe grip to protect the probe from strong impacts, squeezing, etc. It can prevent the probe from falling damage from a height of 10 meters, and even resist hammer strikes. It is recommended that users tighten and fix the non-magnetic metal sleeve after completing the magnetic field measurement to protect the probe from damage to the greatest extent.                


               


               

               



G81 Gaussmeter Specification

Model

G81 / G81P 

Measurement  Specification

Accuracy(DC)                

< ±0.8%  (EACH  PROBE CALIBRATED TO 2.5T)                

Range                

100kG (10T)                

Frequency Response [fT]                

DC  - 10kHz                

DC Magnetic Field Noise                

0.05G (5uT)   [peak-to-peak value within 60s]                

AC Measurement Mode                

AC frequency  response range 0.5Hz-10kHz                

RMS value,  suitable for measuring AC magnetic field of various waveforms (sine wave,  square wave, triangle wave, trapezoidal wave, sawtooth wave, etc.)                

Spectrum Analysis                

Using  Fourier analysis of 20Hz-10kHz AC magnetic field, the screen will display the  2 largest magnetic field peaks and frequency values.                

Display Digits                

4                

Host Storage Capacity                

> 6000 data                

Zero Drift                

Using Bypass Zero Technology, there is no zero drift,  and temperature and hysteresis have no effect on the zero drift of the  magnetic field.                

Typical Temperature Coefficient of Probe                

±300ppm/ (Probes without temperature compensation)                

<±50ppm/ (Probes with temperature compensation)                

Pulse Magnetic Field Capture Function                

G81P Gaussmeter adds pulse magnetic field capture  function: can capture pulsed magnetic field with pulse width ≥ 0.2ms.                

Front Panel

Screen                

3.2  inches color resistive touch LCD, 320x240 Pixel                

Units                

Gauss(G), Tesla(T)                

Display Update Rate                

4 readings/second                

Display Mode                

DC, AC, MAX., MIN, Alarm, N/S Polarity  Indication, Spectrum Analysis, and Pulse Mode, etc.                

Probe

Hall Sensor                

COLIY's third-generation semiconductor GaN Hall sensor                

Probes                

See “Probe Specifications”  for details.                

Connector                

6-core waterproof connector                

Probe Grip and Protector                

Non-magnetic aviation aluminum alloy, resistant to 10m drop                

Probe Cable                

6 shielded twisted pair core flexible cable; Standard CAT5e                

Probe Cable Length                

Standard 1.5m; Customizable longest length of 30 m                

USB Interface

Function                

1,  Communication Interface: to connect PC with gaussmeter host for monitoring  the measurement;                

2,  Charging interface: Used to connect a 5VDC charger or mobile power supply                

Software/ Driver                

With host computer software / Support  LabVIEW™                

Analog Output

Linearity (DC)                

±0.8%                

Function                

Real-time output, the output voltage is proportional to the magnetic  flux density                

Full-scale Voltage                

±5 V                

Scaling (Proportion)                

typ. 1T/V  (Could be customized, such as 2T/V, 0.1T/V,  etc.)                

Frequency Response                

See “Probe Specifications” for frequency response                

Output Resistance                

< 100 Ω (short circuit protected)                

Connection                

Dedicated  analog output BNC conversion cable                

Host Specification

Operating Temperature

-20°C   to  +60°C                

Warm-up time

Can be used immediately after the  device is turned on                

30 min to meet the best performance                

Host Temperature Coefficient

<±20ppm/; Negligible impact on accuracy within the  operating temperature range                

Storage Temperature             

- 20°C   to  +80°C                

Ambient Magnetic Field

<1kG(0.1T)                

Battery            

Rechargeable 5200mAH Li-ion                

Operating Battery Life

>16 hours (Test in standard test  environment, working time will be reduced in low temperature environment)                

Power Supply              

5VDC; could be charged by a mobile  power supply                

Dimension               

238  mm W × 95 mm H × 42  mm D                

Weight

350g                


Probes Specification

 

Model G81 / G81P Gaussmeter Probes

Probe  Model

Range

Frequency Response

Stem dimension  

(mm) 

Operating Temperature 

(°C) 

DC Accuracy

(25°C)

Stem Surface Material

Transverse                

T08M150G81             

T08M150G81T 

100kG

(10T) 

DC-10kHz

80*2.2*1

-20  - +75 

±0.8%

Metal

Transverse                 

T08P150G81

T08P150G81T           

100kG 

(10T)

DC-10kHz

80*2.5*1.3

-20  - +75   

±0.8%

Plastic

Axial

               

A08M150G81

A08M150G81T          

100kG

(10T)

DC-4kHz

80*Φ6  

-20  - +75

±0.8%

Metal

Small-diameter                

A08S150G81             

A08S150G81T           

100kG

(10T)

DC-2kHz

                 

80*Φ2  

                 

-20  - +75  

±0.8%

Metal

0.5mm Ultra-thin                 

T06U150G81             

T06U150G81T 

100kG

(10T)

DC-2kHz

80*2*0.5 

-20  - +75 

±0.8%

Plastic

Note:

1.    The most cost-effective package(high precision, low temperature drift) : G81+ Probe T08M150G81T

2.    Option “T”: Probe with temperaturecompensation, and its typical temperature coefficient is <±50ppm/;

3.    Each probe’s fully calibrated measurementrange: ±2.5T; The accuracy of the range 2.5T-10T is determined by the linearityof the Hall sensor. It is hoped that the accuracy parameters can be reached,but it cannot be guaranteed.

4.    Probes with special requirementscan be customized.

5.    Transverse Probe’s sensor centerposition:


Copper Probe: D=1mm±0.2mm                

Plastic Probe: D=1.2mm±0.2mm                

 
             

 

Optional Accessories


Model

Descriptions                

CAB30

BNC adapting cable for analog output (Only for G81  Gaussmeter)  

SAMRT PC 

Software 

PC SOFTWARE for Gaussmeter 

GHOLD100

3-Direction Precision Movement Platform, made of non-magnetic material. Users fixed the probe on the bracket front-end, and then manually rotate the knob so that the probe moves stably along the X, Y, Z-axis to a certain position and lock fixed. Maximum stroke  of each axis is 150mm, positioning accuracy of 0.1mm; center load: 10kg; weight: 3.5kg

    

The most  popular Package

Package Product No. G8101T: Gaussmeter G81 + Probe T08M150G81T

 

Description of Probe Type Selection


Host Type

Description

G81

Universal  single-axis gaussmeter host   

G81P

Universal  single-axis gaussmeter host, adds pulse magnetic field capture function: can  capture pulsed magnetic field with pulse width ≥ 0.2ms


Description of Probe Type Selection


T

08

M

150

G81

T

PROBE  TYPE                

                 

A  - AXIAL                

T  - TRANSVERSE                

                 

STEM                

LENGTH                

                 

06  - 6 cm                

08  - 8 cm                

10  - 10 cm                

20  - 20 cm                

                 

               

PROBE  STYLE                

                 

M  – METAL                

P  – PLASTIC                

U  – ULTRATHIN                

S – SMALL DIAMETER                

CABLE                

LENGTH                

                 

150  – 150 cm                

               

GAUSSMETER  MODEL                

                 

G80 – G80 probe                

G81 – G81  probe                

                 

                 

TEMPERATURE                

COMPENSATED                

                 

T  - YES                

BLANK  - NO                

Test video

Video:Bypass zero technology 1


Video:Bypass zero technology 2


Video:High resolution

G81 Gaussmeter used in Geomagnetic Survey

 

Overview:

Normally, users use magnetic measurement equipments basedon the principle of fluxgate or magnetoresistance to measure the earth'smagnetic field, such as fluxgate magnetometer, magnetoresistance gaussmeter orcompass, etc.

GaN materials have the characteristics of strong atomicbonds, high thermal conductivity, good chemical stability and strong radiation resistance. COLIY's third-generation semiconductor gallium nitride (GaN) Hall sensor has the characteristics of good temperature stability, high linearityand low noise, and its performance is ahead of the second-generation semiconductor gallium arsenide (GaAs) sensor technology.

G81 with GaNhall sensor used in low field measurement

During the use of an ordinary gaussmeter, the host andprobe will offset the zero point due to changes in temperature and hysteresis.Therefore, the probe must be frequently placed in the zero-gauss chamber forzero calibration.

The Gaussmeter G81 adopts unique Bypass Zero Technology andhigh stability GaN Hall sensor. Both the host and probe have excellent zero point stability and extremely low noise. The peak-to-peak noise within 60 seconds is less than 0.05G. Temperature and hysteresis do not affect the zero point of the Gaussmeter. There is no need for zero calibration, which greatly improves the accuracy and convenience of use.

Therefore, in addition to measuring strong magnetic fields,Gaussmeter G81 with GaN hall sensor could also be used to measure low field,such as the metal materials’ remanence, earth’s magnetic field, etc.

The following is a simulation test using G81 gaussmeter with Probe (GaN hall sensor) to measure the earth’s magnetic field. The probeis fixed on the plate, and then rotates around the central axis of the plate (counterclockwise). A reading is recorded every 10 degrees, and 36 sets of datacan be obtained. Then these data form a corresponding graph, as can be seen inthe figure, the curve is approximately sine.

 The table below is the simulation test data:

Angle (°)                

0                

10                

20                

30                

40                

50                

60                

70                

80                

B (G)                

-0.03                

-0.10                

-0.16                

-0.21                

-0.25                

-0.28                

-0.31                

-0.32                

-0.33                


Angle (°)                

90                

100                

110                

120                

130                

140                

150                

160                

170                

B (G)                

-0.33                

-0.32                

-0.30                

-0.28                

-0.26                

-0.23                

-0.20                

-0.16                

-0.10                


Angle (°)                

180                

190                

200                

210                

220                

230                

240                

250                

260                

B (G)                

-0.04                

0.03                

0.09                

0.15                

0.20                

0.24                

0.28                

0.30                

0.32                


Angle (°)                

270                

280                

290                

300                

310                

320                

330                

340                

350                

B (G)                

0.32                

0.31                

0.29                

0.27                

0.23                

0.20                

0.15                

0.08                

0.03                




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