TEKBOX TBBCI1-200K280 Bulk Current Injection Probe Instructions

TEKBOX TBBCI1-200K280 Bulk Current Injection Probe

Introduction

The TBBCI1-200K280 is a snap-on Bulk Current Injection probe, expanding the Tekbox product range of affordable EMC pre-compliance test equipment. The BCI probe has been designed primarily for conducted immunity testing in the frequency range 150 kHz to 230 MHz, according to standard IEC / EN 61000-4-6. The insertion loss is 8 dB for most of its bandwidth and it is fully compliant with the insertion loss specification of IEC / EN 61000-4-6. The probe is individually characterized and usable in the frequency range 10 kHz – 300 MHz. It can inject severity levels 1, 2, 3 and level X up to 30V into a conducted immunity test set-up according to IEC/EN 61000-4-6. The probe can also be used for RF current monitoring applications.

The aperture of the RF current monitoring probe is 27 mm. The typical insertion loss is 8 dB and the typical transfer impedance is 26 dB Ohm.

Specification

• Compliance: IEC / EN 61000-4-6 insertion loss specification for BCI clamps
• Characterized freq. range: 10 kHz to 300 MHz
• Insertion loss: 8 dB typ.; 50 Ohm system (100 Ω loop impedance)
• Transfer impedance: 26 dB Ohm typ.; 50 Ohm system (100 Ohm loop impedance)
• Power rating: capable of injecting level 1, 2, 3 and stress level X up to 30V 150 Ohm test set-up according to IEC/EN 61000-4-6
• Max. core temperature: 80 °C
• Connector type: N female
• Aperture diameter: 27 mm
• Outside diameter: 92 mm
• Height: 76 mm
• Weight: 1.2 kg

Transfer impedance

Figure 1: typical insertion loss and transfer impedance: 1 kHz to 1 GHz logarithmic, 50 Ω system (100 Ω loop impedance)

Insertion loss and transfer impedance table

The table below shows typical insertion loss and transfer impedance data of a TBBCI1- 200K280 BCI probe. Each current probe is delivered with its corresponding measurement protocol. This data can be used to calculate the required power for immunity testing or for the creation of a correction file for EMCview or similar EMC measurement software. The transfer impedance in dBΩ subtracted from the analyzer reading in dBµV gives the corrected reading in dBµA.

100 Ohm loop:

Frequency [MHz]| Insertion loss [dB]| Trans-impedance [dBΩ]| Frequency [MHz]| insertion loss [dB]| Trans-impedance [dBΩ]
---|---|---|---|---|---
0.01| -33,78| 0,22| 30| -7,63| 26,37
0.02| -27,81| 6,19| 40| -7,66| 26,34
0.03| -24,35| 9,65| 50| -7,70| 26,30
0.04| -21,93| 12,07| 60| -7,74| 26,26
0.05| -20,09| 13,91| 70| -7,78| 26,22
0.06| -18,62| 15,38| 80| -7,82| 26,18
0.07| -17,40| 16,60| 90| -7,85| 26,15
0.08| -16,38| 17,62| 100| -7,88| 26,12
0.09| -15,51| 18,49| 110| -7,89| 26,11
0.1| -14,76| 19,24| 120| -7,90| 26,10
0.2| -10,69| 23,31| 130| -7,89| 26,11
0.3| -9,21| 24,79| 140| -7,89| 26,11
0.4| -8,54| 25,46| 150| -7,90| 26,10
0.5| -8,19| 25,81| 160| -7,91| 26,09
0.6| -8,00| 26,00| 170| -7,93| 26,07
0.7| -7,89| 26,11| 180| -7,97| 26,03
0.8| -7,83| 26,17| 190| -8,04| 25,96
0.9| -7,80| 26,20| 200| -8,11| 25,89
1| -7,78| 26,22| 210| -8,22| 25,78
2| -7,76| 26,24| 220| -8,38| 25,62
3| -7,75| 26,25| 230| -8,57| 25,43
4| -7,74| 26,26| 240| -8,80| 25,20
5| -7,72| 26,28| 250| -9,08| 24,92
6| -7,71| 26,29| 260| -9,42| 24,58
7| -7,70| 26,30| 270| -9,82| 24,18
8| -7,69| 26,31| 280| -10,30| 23,70
9| -7,68| 26,32| 290| -10,93| 23,07
10| -7,67| 26,33| 300| -11,75| 22,25
20| -7,61| 26,39|  |  |

Table 1: Insertion loss and transfer impedance: 10 kHz to 300 MHz, 50 Ω system / 100 Ω loop, typical data

300 Ohm loop:

Frequency [MHz]| Insertion loss [dB]| Trans-impedance [dBΩ]| Frequency [MHz]| insertion loss [dB]| Trans-impedance [dBΩ]
---|---|---|---|---|---
0.01| -41,48| -7,48| 30| -16,10| 17,90
0.02| -35,56| -1,56| 40| -16,09| 17,91
0.03| -32,12| 1,88| 50| -15,95| 18,05
0.04| -29,72| 4,28| 60| -15,89| 18,11
0.05| -27,89| 6,11| 70| -15,78| 18,22
0.06| -26,44| 7,56| 80| -15,80| 18,20
0.07| -25,22| 8,78| 90| -15,68| 18,32
0.08| -24,22| 9,78| 100| -15,70| 18,30
0.09| -23,38| 10,62| 110| -15,64| 18,36
0.1| -22,64| 11,36| 120| -15,55| 18,45
0.2| -18,85| 15,15| 130| -15,51| 18,49
0.3| -17,53| 16,47| 140| -15,39| 18,61
0.4| -16,97| 17,04| 150| -15,20| 18,80
0.5| -16,70| 17,30| 160| -14,99| 19,01
0.6| -16,55| 17,45| 170| -14,71| 19,29
0.7| -16,49| 17,51| 180| -14,48| 19,52
0.8| -16,45| 17,55| 190| -14,27| 19,73
0.9| -16,44| 17,56| 200| -13,97| 20,03
1| -16,45| 17,55| 210| -13,65| 20,35
2| -16,43| 17,57| 220| -13,36| 20,64
3| -16,41| 17,59| 230| -13,11| 20,89
4| -16,38| 17,62| 240| -12,89| 21,11
5| -16,38| 17,62| 250| -12,72| 21,28
6| -16,36| 17,64| 260| -12,57| 21,43
7| -16,34| 17,66| 270| -12,49| 21,51
8| -16,31| 17,69| 280| -12,54| 21,46
9| -16,31| 17,69| 290| -12,84| 21,16
10| -16,30| 17,70| 300| -13,50| 20,50
20| -16,21| 17,79|  |  |

Table 2: Insertion loss and transfer impedance: 10 kHz to 300 MHz, 150 Ω system / 300 Ω loop, typical data

RF forward power requirements

IEC / EN 61000-4-6 specifies following test levels:

• ”X” can be any level, above, below or in between the others. The level has to be specified in the dedicated equipment specification

Table 3: test levels, open circuit voltage

The test levels are open circuit voltages set at the EUT port of the coupling devices. For testing of the equipment, this signal is 80 % amplitude modulated with a 1 kHz sine wave to simulate actual threats.

Picture 2: EN 61000-4-6 150Ω system / 300Ω loop calibration set up using EMCview PRO

Picture 2: EN 61000-4-6 150Ω system / 300Ω loop calibration set up using EMCview PRO The test level is set at the output of the 150 Ω to 50 Ω adapter. The specified test levels are open circuit voltages at the output of the calibration fixture. The voltages measured during calibration must be multiplied by 3 to allow for the 50 Ω to 150 Ω conversion and again by 2 to reach the open circuit voltage. Hence, the measured voltage at the output of the 150 Ω to 50 Ω adapter is 1/6th the voltage of the desired stress level. In logarithmic figures, the measured voltage at the output of the 150 Ω to 50 Ω adapter is 15.5 dB lower than the open circuit voltage.

Test level| Test voltage

e.m.f RMS [V]

| Corresponding power at 150 Ω to 50 Ω adapter output, RMS [dBm]| Corresponding input power into probe RMS [dBm]| Power amplifier peak power requirement considering 6 dB attenuator and AM modulation [W]
---|---|---|---|---
1| 1| -2.6| 13.9| 0.32
2| 3| 7| 23| 2.6
3| 10| 17.4| 33.4| 28.2

Table 4: PA forward power requirements, 300 Ω loop, 100 MHz
Table 3 shows the peak power requirements at midband, 100 MHz. The coupling factor for a 150 Ω system / 300 Ω loop, measured between probe input to 150 Ω to 50 Ω adapter output, has a value of -16 dB at this frequency. The required peak power increases at low frequencies.

Figure 2: PA peak power requirement (includes 6 dB attenuator and peak power requirement for 80% AM modulation

Note that the power is given as RMS Power in Watt. The required peak power of the 80% AM modulated signal is 5.1 dB higher. The probe goes into saturation at stress levels of 30V into a 150 Ω system / 300 Ω loop. Figure 4 shows the core temperature at 30V stress level and 22°C ambient temperature. The measurement time should be limited to 1 hour. At stress level 3, the core takes 4-5 hrs to reach 80°C.

Figure 3: Core temperature increase over time at maximum stress level of 30V

Accessories

Tekbox supplies a calibration fixture for the TBBCI1 series of snap on BCI probes:

Picture 3: TBBCI1-CAL BCI probe calibration fixture

In order to create a complete immunity test set-up, Tekbox supplies further accessories such as 150 Ohm to 50 Ohm transitions, attenuators, modulated wideband RF power amplifiers, RF current monitoring probes and EMCview / EMCview PRO software for automated calibration and measurement.

Ordering Information

History

www.tekbox.com
TekBox Digital Solutions Vietnam Pte. Ltd.
Factory 4, F4, Lot I-3B-1, Saigon Hi-Tech Park, Tan Phu Ward, District 9, Ho Chi Minh City, Vietnam

References

• Tekbox Digital Solutions |

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