RF Probes


RF Current Monitoring Probes

The voltage produced by RF current monitoring probes into a 50-ohm load is proportional to the current flowing through the wires going through the probe aperture. RF current monitoring probes, like LISNs, are used to measure conducted emissions. RF current probes measure the current of conducted emissions, whereas LISNs measure the voltage. Current monitoring probes are not intrusive. It is not necessary to separate the wire harness under test. In addition, RF current monitoring probes typically cover a wider frequency range than LISNs. The EMC standards indicate where LISNs must be used and where current monitoring probes must be used. The primary use is conducted emission measurement on data or control cables. Furthermore, RF current monitoring probes are very versatile tools for the investigation and improvement of EMC issues and for many other applications.
Tekbox RF current monitoring probes cover the frequency range up to 1 GHz. The series with fixed aperture are especially inexpensive. In circumstances, where the cable harness cannot simply be disconnected to feed it through the aperture, Tekbox offers the TBCP2 series snap on probes.
To calculate the corresponding current flowing through the wires passing the probe aperture, subtract the individually documented trans-impedance value in [dB] from the probe’s output voltage.

Model
Characterized
frequency range
Trans-impedance
Aperture
diameter
Snap on / hinge
Product Page

TBCP1-200
10 kHz-
200 MHz
17 dBΩ
25 mm
no

TBCP1-250
30 kHz-
250 MHz
18 dBΩ
25 mm
no

TBCP1-500
30 kHz-
500 MHz
20 dBΩ
25 mm
no

TBCP2-250
10 kHz-
250 MHz
16 dBΩ
32 mm
yes

TBCP2-30K400
10 Hz-
400 MHz
2 dBΩ
32 mm
yes

TBCP2-500
10 kHz-
500 MHz
20 dBΩ
32 mm
yes

TBCP2-750
10 kHz-
750 MHz
22 dBΩ
32 mm
yes

ТВСР3-1000
30 kHz-
1 GHz
20 dBΩ
17 mm
no

TBCP4-250
10 kHz-
250 MHz
14 dBΩ
32 mm
no

TBCP4-500
10 kHz-
500 MHz
16 dBΩ
32 mm
no

TBCP4-750
10 kHz-
750 MHz
20 dBΩ
32 mm
no


RF Surface Monitoring Probes

RF Surface current monitoring probes are utilised in applications where RF currents flowing on surfaces such as PC groundplanes or traces, metal planes or wires must be measured.

Model
Characterized frequency range
Trans-impedance
Footprint
Product Page

TBSCP1-5M300
30 kHz – 400 MHz
-7 dBΩ
40 x 15 mm

TBSCP1-10M500
30 kHz – 600 MHz
-5 dBΩ
40 x 15 mm


Coaxial RF Current Monitoring Probes

Coaxial RF current monitoring probes are used to measure RF currents in coaxial cables. They can be used as general purpose coupling devices to measure RF power or as loop antenna transducers.

Model
Characterized frequency range
Trans-impedance
Application
Product Page

ТВССР1-2K70
10 kHz – 100 MHz
0 dBΩ
Transducer for large loop antennas (LLA)

TВССР1-3K100
10 Hz – 100 MHz
+5 dBΩ
General purpose coupling device

TВССР1-400K600
10 Hz – 600 MHz
+23 dBΩ
General purpose coupling device


RF pulse Current Monitoring Probes

RF pulse Current Monitoring Probes are typically used for surge or RF pulse current monitoring applications in the time domain.

Model
Characterized frequency range
3 dB frequency range
Transfer Impedance (high Z)
Transfer Impedance (50 Ohm)
Droop rate
Rise time
Aperture diameter
Product Page

TBPCP1-20100
1 Hz – 200 MHz
20 Hz – 100 MHz
0.2 V/A
0.1 V/A
< 10% / ms
< 5 ns
25 mm

TBPCP2-3070
1 Hz – 200 MHz
30 Hz – 70 MHz
0.1 V/A
0.05 V/A
< 20% / ms
< 5 ns
5.5 mm


Current Probe calibration fixtures

Current Probe Calibration Fixtures are used for calibrating / measuring the transimpedance of current probes. Calibrators are also required for the calibration of immunity test setups with BCI probes.

Model
Application

TBCP1-CAL
TBCP1 series, TBPCP1-20100

TBCP2-CAL
TBCP2 series

TBCP3-CAL
TBCP3 series

TBCP4-CAL
TBCP4 series

TBPCP2-CAL
TBPCP2-3070


Bulk Current Injection Probes

Bulk Current Injection Probes are used to inject RF-current into cables of electrical equipment to test the susceptibility against radiated electromagnetic energy. Tekbox BCI-probes can be clamped around wire bundles with up to 27 mm. They are designed to meet the specifcations of the standards IC 61000-4-6 (domestic and industrial products) and ISO 11452-4 (automotive products).

Tekbox supplies suitable wideband power amplifiers to drive the BCI probes:

TBMDA-CDN25 for immunity tests according to IC 61000-4-6
TBMDA-BCI25 for immunity tests according to ISO 11452-4

The calibration fixture TBBCI1-CAL is suitable for both BCI-probe models

Model
Frequency range
Coupling loss
Maximum RF input power
Aperture diameter
Outer dimensions
Application / Standard
Product Page

TBBCI1-200K280
150 kHz – 230 MHz
8 dB typical
50 W
27 mm
92 x 76 mm
BCI probe for IEC / ISO 61000-6-4

TBBCI1-800K420
1 MHz – 400 MHz
5 dB typical
50 W
27 mm
92 x 76 mm
BCI probe for IEC / ISO 11452-4

TBBCI1-CAL
150 kHz – 400 MHz
500 W
200 × 150 × 140 mm
BCI probe calibrator for IC / ISO 61000-6-4, IEC / ISO 11452-4