CDG 7000-75-10 - Magnetic and Conducted Immunity, Induced HF, 9 kHz - 250 MHz

IEC 60601-1-2 ED. 4.1 / IEC 61000-4-39

New requirement, immunity to proximity magnetic fields based on IEC 61000-4-39

• IEC / EN 61000-4-6 
• IEC 61326-3-2
• NAMUR
• MIL-STD-461 / DO-160
• IEC 60601-1-2 Ed.4.1 to IEC 61000-4-39 (Close Proximity Magnetic immunity) see below
• Please check out CDG 7000 page for the general specification of the generator

The IEC 60601-1-2 standard is the international standard for testing medical equipment to EMC. The latest update adds a new test as more transmitter products are present in homes, offices (locations where medical equipment may be used), and hospitals. Three frequencies that are in use are: 30 kHz, 134.2 kHz, and 13.56 MHz. The standard IEC 61000-4-39 for testing fields in close proximity is referenced for this testing. With our IEC 60601-1-2 setup these test fields can be produced.

The magnetic loops are specified in IEC 61000-4-39 and are readily available. However, producing a field through the loops might not be straightforward. The loop impedance changes over its frequency range and the amplifier being used will not match this impedance. The result would be a much higher power requirement. In this case, we are not covering a frequency range but individual frequency points. This allows a matching network to be created to match the loop to the amplifier's impedance.

Basic Setup

Schlöder has created a system to match this requirement. The system is computer-controlled to set the field level and perform testing with report generation.

In combination with the CDG 7000-75-10 (PA) and a complete set for the corresponding frequency range, international standards (IEC 60601-1-2 ED. 4.1 / IEC 61000-4-39) for testing medical devices for electromagnetic compatibility can be carried out. These complete sets include a radiating loop, a loop sensor, the matching network for the impedance, and a corresponding stand for the loops.

EN 61000-4-39 describes magnetic field tests in the near field in two frequency ranges from 9 kHz - 150 kHz and from 150 kHz - 26 MHz. For both ranges, complete sets are offered for operation on a typical RF broadband amplifier. (Take the required sets for your tests from the “Equipment or complete sets..” compilation).

Construction coil set

Sensor Loop LS 040-1, Transducer Factor

Radiating loop RL 100-3, Magnetic Field Strength
Magnetic field strength, amplifier output power: 35 dBm (3.2 W)
Radiating loop RL 100-3, with the matching network (60601-1-2)

Radiating loop RL 100-3, Amplifier Output Power for different Magnetic Field Strengths
Amplifier output power for different magnetic field strengths
Radiating loop RL 100-3, with the matching network (61000-4-39)

Radiating loop RL 120, Amplifier Output Power for different Magnetic Field Strengths
Amplifier output power for different magnetic field strengths (incl. 80% AM)
Radiating loop RL 120, with matching network

For IEC 60601-1-2, approxi-mately 46.3 dBm is required for 65 A/m at 134.2 kHz with the same setup. This can be realized with the 75W-10 kHz amplifier. With a resonance capacitor in series with the matching network, this required power can be halved to 43.1 dBm.

The following complete sets of equipment is required for the tests:
Generator, software, and measurement

• CDG 7000-75-10 - 10 kHz - 250 MHz, 75 Watt, amplifier, RF Generator, RF Meter x3 (monitored level, forward & reverse power) only IEC 60601-1-2
• Option: PreAmp 150kHz-26MHz -4-39
  Preamplifier for CDG 7000-75-10 for tests according to IEC 61000-4-39
  (sensor coil LS 040-1 provides too low an output level for the CDG 7000 for the lowest standard levels at low frequencies)
• HELIA 7-MGA software: The system includes all cabling and HELIA 7 software required to meet the standard’s requirements.

Complete set for frequency range: 9 kHz – 150 kHz
Article No.: Set 9kHz-150kHz -1-2/-4-39

Coil set RL-120 & LS-040 incl. stand and matching network for tests according to IEC 60601-1-2 Ed. 4.1 (30 kHz, 134.2 kHz) and IEC 61000-4-39 (9 kHz to 150 kHz)

• MGA RL 120 – Radiating loop 120 mm as specified in IEC 61000-4-39 for 9 kHz – 150 kHz, IEC / EN 60601-1-2 and MIL-STD-461 / RS101, 3 m cable
• MGA RL 120 NW – Matching Network for MGA RL 120, matches loop to 50 Ohms of the CDG 7000 amplifier acc. to IEC 61000-4-39 and IEC / EN 60601-1-2 for Immunity to magnetic fields 9 kHz - 150 kHz
• MGA RL 120 Stand – Stand for MGA RL 120 for tests
• MGA LS 040 – Loop sensor 40 mm
• Cable set

Complete set for frequency range: 150 kHz – 26 MHz
Article No.: Set 150kHz-26MHz -1-2/-4-39
Coil set RL-100-3 & LS-040-1 incl. stand and matching network for tests according to IEC 61000-4-39 (150 kHz to 26 MHz) and IEC 60601-1-2 (13.56 MHz)

• MGA RL 100-3 – Radiating loop as specified in IEC 61000-4-39 and IEC / EN 60601-1-2 for 150 kHz – 26 MHz
• MGA LS 040-1 – Loop sensor 40 mm that attaches to MGA RL 100-3 at the correct distance of 50 mm as specified in IEC 61000-4-39 and IEC / EN 60601-1-2
• MGA RL 100-3 stand – for tests in stronger magnetic fields
• MGA RL 100-3 NW-60601 – Matching Network 60601 for MGA RL 100-3, matches MGA RL 100-3 to the IEC 60601-1-2 requirements
• MGA RL 100-3 NW-61000 – Matching Network 61000 for MGA RL 100-3, matches MGA RL 100-3 to the IEC 61000-4-39 requirements
• Cable set

Set -4-39 for frequency range: 150 kHz – 26 MHz
Article No.: Set 150kHz-26MHz -4-39
Coil set RL-100-3 & LS-040-1 incl. stand and matching network for tests according to IEC 61000-4-39 (150 kHz to 26 MHz)

• MGA RL 100-3 – Radiating loop as specified in IEC 61000-4-39 and IEC / EN 60601-1-2
• MGA LS 040-1 – Loop sensor 40 mm that attaches to MGA RL 100-3 at the correct distance of 50 mm as specified in IEC 61000-4-39 and IEC / EN 60601-1-2
• MGA RL 100-3 stand – for tests in stronger magnetic fields
• MGA RL 100-3 NW-61000 – Matching Network 61000 for MGA RL 100-3, matches MGA RL 100-3 to the IEC 61000-4-39 requirements
• Cable set

Set -1-2 for frequency range: 150 kHz –26 MHz
Article No.: Set 150kHz-26MHz -1-2
Coil set RL-100-3 & LS-040-1 (incl. stand and matching network) for tests according to IEC 60601-1-2 (13.56 MHz)

• MGA RL 100-3 – Radiating loop as specified in IEC 61000-4-39 and IEC / EN 60601-1-2
• MGA LS 040-1 – Loop sensor 40 mm that attaches to MGA RL 100-3 at the correct distance of 50 mm as specified in IEC 61000-4-39 and IEC / EN 60601-1-2
• MGA RL 100-3 stand – for tests in stronger magnetic fields
• MGA RL 100-3 NW-60601 – Matching Network 60601 for MGA RL 100-3, matches MGA RL 100-3 to the IEC 60601-1-2 requirements
• Cable set

Upgrade for frequency range: 9 kHz – 150 kHz (with existing equipment RL 120 / LS 040)
Article No.: Upgrade 9kHz-150kHz -4-39
Stand and matching network for coil set RL-120 & LS-040 for tests according to IEC 61000-4-39 (9 kHz to 150 kHz)

• MGA RL 120 NW – Matching Network for MGA RL 120, matches loop to 50 Ohms of the CDG 7000 amplifier acc. to IEC 61000-4-39 and IEC / EN 60601-1-2 for Immunity to magnetic fields 9 kHz - 150 kHz
• MGA RL 120 Stand – Stand for MGA RL 120 for tests
• Cable set

Capacitor
Article No.: Capacitor 1/2W 134,2 kHz -1-2
The capacitor in housing (resonance matching) for RL-120 with matching network BNC male/ BNC female. When testing for IEC 60601-1-2: 134.2 kHz, 65 A/m, the required power can be halved from 46.3 dBm / 43 W to 43.1 dBm / 20 W with the optional resonance matching. The capacitor in the housing is plugged in front of the matching network.

Added system advantage

• EUT monitoring: with Digital TTL signals & analog 0-10 VDC (automate threshold and report)
• EUT Fail port: Stop test or mark report
• SCPI interface control for universal support (11452-4)
• Conducted immunity testing to IEC 61000-4-6, ISO, MIL, and other standards with the use of additional accessories CDNs, EMC clamps, BCI clamps