TEKBOX TBL05100-1 5µH Line Impedance Stabilisation Network Instruction Manual

TEKBOX TBL05100-1 5µH Line Impedance Stabilisation Network

Product Information

• Product Name: TBL05100-1
• Version: V1.0
• Supported Standards: CISPR 16-1-2, CISPR 25, MIL-STD-461G, DO-160, ISO11452-4 and ISO 7637-2
• Dimensions: 300 mm x 150 mm x 150 mm
• Weight: 2.7 kg

Product Usage Instructions
Spectrum Analyzer / Measurement Receiver Protection The TBL05100-1 LISN does not contain any protective elements in the RF path. To protect the spectrum analyzer/measurement receiver input from harmful transients or high RF noise levels, use an external attenuator and/or limiter.

Jumper Settings
To access the jumpers, remove the housing cover. Set the jumpers according to the table provided on the silkscreen print of the PCB. After setting the jumpers, reattach the housing cover.

Impedance
No specific information is provided in the user manual regarding impedance.

Phase
No specific information is provided in the user manual regarding the phase.

Isolation
No specific information is provided in the user manual regarding isolation.

Thermal Characteristics
No specific information is provided in the user manual regarding thermal characteristics.

Voltage Division Ratio

Application
Conducted Emission Measurement Setup, Voltage Method: Refer to the provided pictures (12 and 13) for the basic diagram and setup details of a conducted emission measurement using the voltage method. Ensure that the EUT’s power return line is either locally grounded or remotely grounded, as shown in the pictures.

Conducted Emission Measurement Set Up, Current Probe Method
To measure conducted emissions using the current probe method, place the current probe at 50 mm and 750 mm distances from the EUT. Each LISN’s RF output must be terminated with a 50 Ohm termination. Use two LISNs to establish a defined supply impedance. The load simulator is a specially designed device that simulates the load existing at the EUT’s signal/control interface.

Bulk Current Injection
For immunity tests performed in accordance with ISO11452-4, use a configuration similar to the current probe-based conducted emission measurements. Instead of using a current probe, feed an interferer signal into the BCI probe using a signal generator/power amplifier. Use two LISNs to establish a defined supply impedance. The LISNs’ RF output must be terminated with an external 50 Ohm termination with sufficient power handling capacity.

Introduction

The TBL05100-1 is a universal 5µH LISN that meets the requirements of several standards. The TBL05100 is factory jumpered to 50Ω // 5µH + 1Ω, fulfilling the CISPR 16-1-2 and CISPR 25 impedance, phase isolation specification. By setting the internal jumper, it can be converted into 50Ω // 5µH variants that support standards such as CISPR 25, MIL-STD-461G, ISO11452-4, and ISO 7637-2. By adding an external 10F capacitor, the impedance will fulfill DO-160 specifications. The LISN is inserted into the EUT’s (Equipment Under Test) supply line. Conducted noise at the EUT’s supply terminals can be monitored at the BNC connector with a spectrum analyzer or a measurement receiver. A 5µH inductor decouples the source (supply) terminal from the EUT terminal. The use of two TBL05100-1 in conjunction with the Tekbox LISN Mate allows for the measurement of common mode and differential mode noise separately. The unit comes equipped with a BNC-male to N-male RG232 cable, mating connectors, and ground brackets to attach it to a ground plane.

Parameters

Topology: single path, configurable, 50Ω // 5µH + 1Ω, 50Ω // 5µH; the internal capacitor can be disconnected for ISO 7637-2 and DO-160 setups; an external 10µF capacitor is available for DO-160; the LISN is factory setup to 50Ω // 5µH + 1Ω, other configurations require setting of an internal high current jumper Supported standards: CISPR 16-1-2, CISPR 25, MIL-STD-461G, DO-160, ISO11452-4 and ISO 7637-2 Characterized frequency range: 10 kHz – 400 MHz DC Resistance: < 5 mΩ Source+ to EUT+; < 5 mΩ Source- to EUT- Maximum current: 100A; see a plot with heat-up characteristics, chapter 8 Nominal operating voltage range: 0 – 250V AC/DC; Component ratings: 350V AC, 50/60 Hz; 1000V DC High current plug/screw terminals; male: Phoenix Contact 1762741, female: Phoenix Contact 1762592; 2 pcs female terminal blocks are supplied as default accessories

• Jumper: Harwin D3087-98
• Dimensions: 300 mm x 150 mm x 150 mm
• Weight: 2.7 kg

Warning
Spectrum Analyzer / Measurement Receiver protection:

The TBL05100-1 LISN does not contain any protective elements in the RF path. Use an external attenuator and/or limiter to protect the spectrum analyzer/measurement receiver input from harmful transients or high RF noise levels.

Safety
Because of the CISPR 16-1-2, CISPR 25 (EN 55025), MIL-STD-461G, and DO-160 design requirements, LISNs do not comply with the maximum permissible leakage current as specified in EN61010-1. Furthermore, LISNs do not fulfill the isolation requirements of CAT II. The LISN housing is connected to the negative / ground SOURCE and EUT pin of the terminal block and the ground of the RF connector. Inadvertently connecting the positive voltage or line voltage to the ground pin puts you at risk of a lethal electric shock. The TBL05100-1 is exclusively for use in laboratories and must be operated by qualified personnel.

Principle schematic

To access the jumpers, the housing cover must be removed. Re-attach it after setting the jumpers. Refer to the table above, or to the table on the silkscreen print of the PCB.

Impedance

Picture 3: LISN impedance, 100 kHz – 110MHz; 50Ω // 5µH+1Ω; Jumper J1 open, Jumper J2 shorted

5µH Line Impedance Stabilisation Network

Phase

Isolation

The isolation is measured between the SOURCE port and RF port, with the EUT port terminated with 50 Ohm.

Thermal characteristics

Voltage division ratio according to CISPR 16 -1-2 Annex A8

Frequency [MHz]| VDR [dB] 50Ω // 5µH+1Ω| VDR [dB]

50Ω // 5µH

| Frequency [MHz]| VDR [dB] 50Ω // 5µH+1Ω| VDR [dB]

50Ω // 5µH

---|---|---|---|---|---
0.1| -0,81| -0,88| 10| -0,17| -0,17
0.125| -0,57| -0,61| 20| -0,14| -0,15
0.15| -0,45| -0,47| 30| -0,30| -0,30
0.175| -0,35| -0,34| 40| -0,33| -0,36
0.2| -0,28| -0,29| 50| -0,33| -0,37
0.25| -0,23| -0,23| 60| -0,59| -0,60
0.5| -0,13| -0,14| 70| -0,57| -0,60
0.75| -0,13| -0,13| 80| -0,55| -0,57
1| -0,12| -0,12| 90| -0,66| -0,68
1.2| -0,12| -0,13| 100| -0,64| -0,65
1.5| -0,12| -0,12| 110| -0,69| -0,71
2| -0,12| -0,12| 120| -0,92| -0,93
2.5| -0,11| -0,12| 130| -0,98| -0,98
5| -0,13| -0,12| 140| -1,08| -1,10
7.5| -0,14| -0,14| 150| -1,09| -1,12

Application

The abbreviation LISN stands for Line Impedance Stabilisation Network.

•  It is a low-pass filter typically placed between a power source and the supply terminals of a device under test (EUT).
• It has a feed-through path to supply the EUT with power
• It provides a well-defined RF-impedance to the EUT
• It couples electrical noise generated by the EUT to a 50 Ω RF port, which can be connected to a spectrum analyzer or measurement receiver
• It suppresses electrical noise from the supply side toward the EUT
• It suppresses electrical noise from EUT side toward the supply

Picture 12: Basic diagram of a conducted emission measurement setup with a LISN
Further applications such as conducted noise measurements using RF current monitoring probes, radiated emission tests, BCI tests and voltage transient tests require LISNs to establish a defined supply line impedance.

Conducted Emission Measurement Setup, Voltage Method
CISPR 25 specifies two measurement configurations: If the EUT is grounded to the vehicle chassis with a power return line shorter than 20 cm in length, a single LISN is adequate, and the conducted noise is monitored only on the positive supply line.
If the power return line of the EUT is longer than 20 cm, two LISNs are required. One LISN connects the positive supply line to the EUT, and another LISN connects the power return line to the EUT. Conducted noise is measured on both lines. It is actually measured on one LISN at a time, with the other LISN’s RF port terminated with a 50 resistor. Professional noise measurements are performed in shielded chambers since any ambient noise picked up by the wires connecting LISN to EUT or by the EUT itself will be present at the RF terminal. In pre-compliance setups, a test should be performed with the EUT turned off to distinguish between conducted noise generated by the EUT and emissions from other sources (ambient noise). Tekbox provides low-cost, desktop shielded tents or shielded bags to suppress ambient noise for pre- compliance conducted noise measurements.

Figures 3 and 4 depict conducted noise measurement setups using the voltage method, as specified in CISPR 25. If the EUT is connected to additional peripheral devices, they should also be connected or emulated using a load box. If a remotely powered EUT’s housing is designed for chassis grounding, it should also be grounded to the ground plane. The grounding lead should be no more than 150mm length. Because most devices are remotely grounded, the configuration shown in Figure 4 is more frequent. The measurement must then be performed alternately on both the positive and negative power lines. The unused RF port is always terminated with 50 Ohm. It should be noted that conducted noise testing per DO160 necessitates the insertion of a 10µF capacitor across the LISN’s source terminals.

Conducted emission measurement setup, current probe method

The CISPR 25 current probe measurement is used to monitor conducted emissions on a wire harness, including control/signal lines of an EUT. Some vehicle manufacturers utilize the wide bandwidth of current probes to measure conducted emissions on power supply lines over a wider frequency range than LISNs can. Measurements are typically taken on various lines – plus, minus, control signals, plus + minus, plus + minus + control lines. In order to account for cable harness resonance effects, the current probe is measured at 50 mm and 750 mm distances from the EUT. Each LISN’s RF output must be terminated with 50 Ohm.
The current probe picks up the conducted emissions. To establish a defined impedance on the power lines, two LISNs are necessary. The load simulator is a specially designed device that simulates the load existing at the EUT’s signal/control interface.

Bulk Current Injection
Immunity tests performed in accordance with ISO11452-4 employ a configuration similar to that used for current probe-based conducted emission measurements. However, instead of using a current probe to measure conducted emissions, a signal generator/power amplifier feeds an interferer signal into the BCI probe. Again, two LISNs are required to establish a defined supply impedance. The LISNs’ RF output must be terminated with an external 50 Ohm termination with enough power handling capacity.

Voltage transient testing
The TBL05100 can be configured to meet the impedance specifications of ISO 7637-2. Chapter 4 contains the appropriate jumper configuration.

Ordering Information

pc. 75 cm BNC- male to N-male RG223 cable

Calibration certificate and NIST traceable calibration data

History

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