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TekBox DC-LISN-Combo1 Zestaw LISN do pomiarów DC - Stabilizator impedancji sieci zasilającej

Manufacturer:

TEKBOX
Price:

3 495,00 zł netto
4 298,85 zł brutto (23% VAT)

Ask about product

DC-LISN-Combo1 Line Impedance Stabilization Network (LISN) Kit.

Kit includes:

  • 2 x TBOH01 5uH LISNlineimpedance stabilizer foremission measurements carried out with DC current
  • 1 x TBLM01 LISN Mate - signal splitter for LISN.
  • 1x BNC terminator
  • 2x N connector to BNC connector 75 cm RG58
  • 1x BNC connector to BNC connector 35 cm RG223

Product overview

The Tekbox DC-LISN-Combo1 kit contains all the components for measuring conducted noise on the power supply line of the device under test (DUT). With two included TBOH01 5uH DC LISN Line Impedance Stabilization Network devices and one TBLM01 LISN Mate device that separates the conducted noise signal into its common-mode and differential-mode components, the conducted noise on the power line can be analyzed and separated into differential and common-mode components, as shown in the figure below.


The LISN devices are designed for EMC compliance measurements on the power line of DC-powered equipment in the frequency range of 150 kHz to 110 MHz. For more information on individual products, please refer to their pages and datasheets.

Key features

TekBox TBOH01 5uH DC LISN line impedance stabilization network

The TBOH01 5µH LISN is the device required to configure conducted noise measurements of DC-powered equipment. It is designed for EMC pre-testing in the frequency range from 150 kHz to 110 MHz in accordance with CISPR 25.

  • Frequency range: 100kHz - 110MHz
  • DC resistance: 40m Ohm
  • Maximum current: 10A
  • Nominal operating voltage range: 0 - 75V DC
  • Absolute maximum rating: 200V
  • Built-in surge protection

The LISN is connected to the power supply line of the device under test (DUT). The conducted noise present at the DUT power supply terminals can be measured at the BNC connector using a spectrum analyzer or measurement receiver. The source (power) terminal and the DUT terminal are decoupled using a 5µH inductor.

Application


The line impedance stabilization network is essentially a coupling device for measuring conducted noise present on power lines using a measurement receiver or spectrum analyzer. It establishes a defined impedance configuration for the measurement, regardless of the impedance of the power source. Hence the name Line Impedance Stabilization Network.

The LISN has three terminals - both ends of the DC pass path and coaxial terminal 50 for connecting a measurement receiver or spectrum analyzer.

Basic functionality of the LISN network

The conducted noise from the device under test (DUT) is coupled from the power line to a 50 Ohm BNC connector. The coupling loss from the DUT to the BNC connector is less than 1 dB in the range from 3 MHz to 100 MHz. On the other hand, LISN isolates the DUT and BNC connectors from conducted noise coming from the source side.

The device under test can be any DC-powered electronic device. The source can be any DC power supply with a maximum voltage of 200 V.

Although the LISN is typically used to measure conducted noise from a DC-powered device, it can also be used to deliver radio frequencies to DUT power lines. This configuration requires an additional loop-through terminal on the BNC connector. In addition, LISN can be used to measure the noise of a source, such as a switching power supply or the output of a DC/DC converter. In this case, the power supply must be connected to the DUT terminals, and the load must be connected to the Source terminals.

The test configurations presented in the following sections are only examples and do not strictly follow the standards. Rather, they should serve as an easy way to perform preliminary EMC tests in the lab before going to a certified test facility.

Configuration dimensions, limits on interference levels, bandwidth and detector settings for a measurement receiver or spectrum analyzer must come from the standards used.

Standard compliant measurements use two LISNs if the return line of the DUT vehicle feed is longer than 200 mm. One in the positive and the other in the negative supply line, and then alternately measure interference. If measured before compliance, measuring the positive supply line gives a good indication of the device's performance. The measurement can then be repeated with the LISN inserted into the negative power line to see if the noise levels are different.

Professional conducted noise measurements are made in shielded chambers, since any RF smog picked up by the wires from the LISN to the DUT or by the DUT itself will be present at the BNC terminal. Therefore, it is necessary to make a measurement in advance with the DUT powered off to distinguish the actual conducted noise generated by the DUT from RF smog from other sources ( ambient interference).

TekBox TBLM01 cooperative network module for line impedance stabilization


The TBLM01 is a complementary device for LISN that splits the conducted noise signal into its common-mode and differential-mode components, with each signal component available on a separate BNC port. The line impedance stabilization network is a coupling device for measuring conducted noise present on power lines using a measurement receiver or spectrum analyzer. It establishes a defined impedance configuration for the measurement, regardless of the impedance of the power source.

  • Frequency range: 30 kHz - 110 MHz
  • Maximum RF level on any BNC port: 27dBm
  • Maximum DC current on any BNC port: 30mA
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