Magnetic Field Generator

1. Unboxing and Basic Familiarization with the Equipment

1.1 Key Technical Specifications

Model Number	PFM61000-8A	PFM61000-8B
Magnetic Field Strength	Long-term: 1 A/m to 100 A/m (continuously adjustable); Short-term: 100 A/m to 1000 A/m (continuously adjustable)	Long-duration: 1 A/m to 400 A/m (continuously adjustable) Short-duration: 400 A/m to 1000 A/m (continuously adjustable)
Magnetic Field Duration	Long duration: 1 second to 999 minutes; Short duration: 1 second to 5 seconds
Total Harmonic Distortion of Output Current	<8%
Magnetic Field Direction	Horizontal, vertical, and 360-degree rotation in any direction, with vertical movement, to support both the proximity method and the immersion method testing
Magnetic Field Frequency	50 Hz or 60 Hz
Magnetic Field Coil	1 x 1 m single coil	1 x 1 m, multiple turns
Control System	10-inch Extra-Large Chinese-English Android Touchscreen

1.2 Unboxing and Checking the Contents

1.2.1 Unpacking and Visual Inspection

When unpacking the device, handle it gently to avoid scratching the outer casing with sharp tools. After unpacking, first inspect the exterior of the device to ensure there is no obvious deformation or dents, and that the buttons are not damaged or loose. If you notice any abnormalities with the device or its accessories, do not turn it on. Please contact us immediately.

1.2.2 Main Unit and Accessories

Main Unit Category: PFM61000-8 Magnetic Field Generator, power-frequency magnetic field coil, and mounting bracket.

Figure 1

Other Standard Accessories:

Number	Note
①	Power-frequency magnetic field coil connection cable, connecting the coil to the main unit
②	Power Input Connection Cable for Power Line Frequency Magnetic Field Coil
③	Power Cord
④	Ground wire, used to connect to the PGND protective ground terminal
⑤	Coaxial cable, which can be used to connect an external oscilloscope to view the coil current

Figure 2

Download links for the digital user manual, software, warranty card, and other materials have been sent via email. Please download them promptly. If you missed the email, you may contact us to request the download links again.

1.3 Primary Purpose of the Equipment

This equipment is specifically designed for power-frequency magnetic field immunity testing of electrical and electronic products. It simulates the power-frequency magnetic field environments found in residential and commercial areas, industrial and mining enterprises, power plants, and medium- and high-voltage substations, providing an accurate basis for testing the immunity performance of the equipment under test (EUT). It fully complies with the requirements of the GB/T 17626.8-2006 and IEC 61000-4-8:2020 standards.

2. Safety Precautions

2.1 Placement Guidelines

Ensure the ambient temperature is between 15°C and 35°C, relative humidity between 10% and 60% (no condensation), and atmospheric pressure between 86 kPa and 106 kPa. Avoid short circuits or damage to the equipment caused by moisture;

The premises must be free of strong electromagnetic interference, corrosive gases, flammable or explosive materials, and dust, and must be well-ventilated to prevent electrical sparks from causing hazards;

Place on a level surface; avoid tilting or inverting the unit, and keep it away from sources of vibration;

The equipment must be placed at least 1 meter away from walls and surrounding structures (such as other testing equipment and shelving) to facilitate maintenance; at least 2 meters of space must be left in front of the equipment to ensure smooth operation, and there must be no obstructions in the surrounding area.

2.2 Power Supply Specifications

Verify that the equipment’s power supply voltage matches the mains voltage (AC 220 V ±10%, 50/60 Hz), and ensure that the power supply is properly grounded and that the ground wire is not damaged or loose;

Verify that the power supply voltage for the magnetic field coil matches the supply voltage (AC 220 V ±10%, 50/60 Hz), and ensure that the power supply is properly grounded and that the grounding wire is free of damage or looseness. Note that the maximum inrush current when the coil starts up can reach 25 A to 32 A. If a ground-fault circuit interrupter (GFCI) is installed, please ensure that the GFCI’s trip current rating meets the equipment’s testing requirements;

Grounding Requirements: The host unit’s protective ground terminal (PGND) must be connected to earth, with a grounding resistance of ≤4 Ω, to ensure the safe dissipation of test voltage and current.

2.3 Operating Procedures

Operators must undergo professional training and be familiar with this manual and the relevant standards. Non-professionals are prohibited from operating or disassembling the equipment. Opening the cover without authorization may pose an electric shock hazard; contact the manufacturer’s technical staff for repairs.

While the equipment is in operation, do not touch the terminals, wiring, coils, or samples under any circumstances.

Before testing, make sure there are no unauthorized persons in the test area, especially around the coil.

Operators must have dry hands and must not wear any metal jewelry.

People with implanted medical devices (such as pacemakers) should not operate this equipment to avoid any effects that strong magnetic fields may have on their implanted devices.

Before replacing the EUT, you must ensure that the test has been stopped.

When multiple people are involved, clearly define roles and responsibilities, and confirm them with each other before starting the test to avoid errors.

2.4 Other

For matters not covered in this manual, please proceed with caution or contact us.

3. Equipment Hardware Overview and Wiring

Number	Note
①	Power-Frequency Magnetic Field Coil and Its Bracket
②	Coil connection cable, connecting the main unit to the coil
③	Computer Power Cord
④	Host Power Switch
⑤	Emergency Stop Switch
⑥	Touchscreen
⑦	Main circuit, i.e., coil input power supply indicator light
⑧	Test Indicator Light
⑨	USB port for connecting a USB mouse or a USB flash drive to update the software
⑩	The other ports here are reserved; unless otherwise specified, they are currently inactive.
⑪	Input the voltage and current readings to display the voltage and current at the coil power input terminal at point ⑬ when switch ⑭ is turned on.
⑫	Preset voltmeter and preset ammeter, displaying the current actual preset voltage and preset current values
⑬	Coil input power supply connection wire; refer to Section 2.2.1 for connecting it to a suitable power source.
⑭	Coil Input Power Supply Switch
⑮	You can use a coaxial cable to connect an external oscilloscope and view the coil current.
⑯	PGND: Protective ground terminal. Connect to ground using a ground wire. See Section 2.2.1.

Figure 3

4. Introduction to the Touchscreen Program

4.1 Program Startup Screen

Number	Note
①	General Usage Guidelines (This feature is still under development; please do not use it at this time)
②	Switch Between Chinese and English
③	System Information Screen
④	Power-Frequency Magnetic Field Test Interface

Figure 4

4.2 Power-Frequency Magnetic Field Test Interface

Number	Note
①	Set test field strength
②	Set test duration
③	The excitation current is automatically calculated based on the set field strength; no adjustment is required.
④	Coil factors, preset parameters—no modifications required
⑤	Number of tests: Generally, one test is sufficient.
⑥	Return to the Home Screen
⑦	Test Parameter Settings Interface
⑧	Troubleshooting Interface: No troubleshooting is required during normal use of the device. If the device produces abnormal test data in the future, please contact us for troubleshooting.
⑨	After clicking “Start,” the device will begin the self-calibration process.
⑩	Display of Power-Line Magnetic Field Frequency

Figure 5

4.3 Test Parameter Settings Interface

Number	Note
①	Set the Test Field Strength
②	Set the test duration
③	Set the frequency of the power-frequency magnetic field
④	Return to the Power-Frequency Magnetic Field Test Screen

Figure 6

5. Arrangement of the EUT and Test Bench

5.1 Test Bench Requirements

The test bench must be made of non-metallic materials (such as wood or plastic) to prevent metallic materials from affecting the magnetic field distribution. The recommended height of the test bench is 80 cm to 100 cm to facilitate operation and observation of the EUT’s condition. The test bench must be placed in the center of the coil to ensure that the EUT is in a uniform magnetic field environment.

5.2 EUT Placement Specifications

In accordance with the requirements of GB/T 17626.8-2006 and IEC 61000-4-8:2020, place the EUT on the test bench in its normal operating condition. The relative position between the EUT and the coil must comply with the standard specifications (typically at the centerline of the coil) to avoid distances that are too close or too far, which could affect test accuracy. The power and signal cables connected to the EUT must be arranged according to actual usage conditions to prevent additional interference.

6. Power-frequency Magnetic Field Testing

6.1 Startup Procedure

Refer to Chapter 3 to connect all wires properly. Turn on the main unit’s power, then turn on the coil power input switch. The coil power input indicator light will illuminate, and the coil input voltage display will show the current coil input voltage.

6.2 Magnetic Field Generator Ready

6.2.1 Test Parameter Settings

Set the test parameters required by the standard and the EUT performance class, as well as those specified in sections 1.1 and 4.3.

6.2.2 Host Self-Adjustment

Once the parameters are set, return to the test interface. Click “Start,” and the device will perform self-calibration. The main unit will automatically adjust the excitation current, preset voltage, preset current, and other parameters based on the field strength settings you specified. The preset voltage and current are displayed in the lower-left corner of the program.

Figure 7

When the readings on the preset voltmeter and ammeter match the voltage and current values preset in the program, the main unit automatically completes the adjustment.

Note: The ammeter is a wide-range ammeter; when the actual current is low, the reading on the meter does not change significantly,

6.3 Start Testing

Once the host has finished self-calibration, the “Start” button will reappear on the program interface; click it to begin the test.

Figure 8

The host test indicator light is on.

6.4 Monitoring the Testing Process

6.4.1 Equipment Status Monitoring

Number	Note
①	Actual Output Field Strength of the Coil
②	Actual Excitation Current Display
③	Test Countdown

Figure 9

The output electric field strength should remain stable within ±5% of the preset value, and the excitation current should show no abnormal fluctuations. If any abnormalities occur, please stop the measurement and contact us.

6.4.2 EUT Status Monitoring

Observe and record the operating status of the EUT, including: whether it functions normally (e.g., whether it shuts down, displays errors, or experiences a decline in performance); whether the display is normal (e.g., whether indicator lights or the display screen show any abnormalities); and whether the output is normal (e.g., whether signal output and action execution meet requirements). Keep detailed records of any abnormalities observed in the EUT during the test and the time they occurred.

6.5 Evaluation of Test Results

Level	Evaluation Criteria	Typical Use Cases
A	Performance was completely normal during and after the test, in accordance with the manufacturer’s technical specifications, with no functional degradation or loss.	Precision measuring instruments, medical monitoring equipment, safety control systems
B	Performance may be temporarily reduced during testing, but no functionality is lost; performance automatically returns to normal after testing without requiring operator intervention.	Industrial controllers, UPS systems, and communications equipment
C	Functional loss is permitted during the test, but normal operation must be restored after the test through operator intervention (e.g., restarting or resetting), and the equipment must remain undamaged.	Standard office equipment, household appliances, and non-critical industrial equipment
D	Functionality cannot be restored after testing; the equipment is permanently damaged; or its performance fails to meet basic requirements.	Determined to be non-compliant; design corrections required

7. Post-Test Procedures

7.1 Test Termination

If the EUT is visibly damaged during the test, immediately tap “Stop Test” on the touchscreen. If no abnormalities occur during the test, wait for the test to end automatically.

7.2 Post-Test Cleanup and Organization

Turn off the input power supply on the coil, then turn off the power to the main unit.

Clean the test area and wipe it down with a dry cloth; do not use alcohol or corrosive cleaning agents.

Power-frequency magnetic field testing is a destructive test; it does not automatically generate a test report. You can create your own test report based on the recorded data and the test procedure.

7.3 Equipment Storage

7.3.1 Short-Term Storage Requirements

If the equipment is used for routine operations, no further action is required after cleaning is completed following each test.

7.3.2 Requirements for Long-Term Storage

If the device will not be used for an extended period (more than one month), please disconnect all cables and cover the device with a dust cover to prevent dust buildup.

The device should be powered on once a month for half an hour to prevent the aging of electrical components (such as capacitors and contactors).

8. Troubleshooting and Resolving Common Problems

8.1 The device won’t turn on

Fault Symptoms	Possible Causes	Troubleshooting Methods
After turning on the power switch, the device does not respond (the indicator light does not come on, and the fan does not spin).	The power cord is not properly connected or is damaged; the supply voltage is abnormal; a fuse has blown; the MOV (varistor) has failed.	Ensure that the power cord is in good condition and securely connected. Power supply issues—such as unstable voltage, excessive voltage, or harmonic interference—can cause the fuse or varistor to burn out. We recommend using a regulated, clean sine-wave AC power supply to power the equipment. If necessary, replace the fuse or varistor with one of the same type.

The figure below shows the location of the fuse:

Figure 13

The figure below shows the location of the varistor (MOV) inside the filtered power supply:

Figure 14

8.2 Circuit Breaker Tripping During Testing

Fault Symptoms	Possible Causes	Troubleshooting Methods
After turning on the input power supply for the coil, the circuit breaker tripped in the laboratory.	The current rating of the laboratory ground-fault circuit interrupter is too low; the maximum inrush current when the coil starts up can reach 25 A to 32 A.	Upgrade the laboratory ground-fault circuit interrupter to at least 32A