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Tudor House, Grammar School Road, North Walsham, Norfolk, NR28 9JH, UK

9123 & 9145 Clamp-on Current Probes Measuring

Clamp-on Current Probes (Measuring) – for 32mm Cable

These probes are designed to measure RF current on cables up to 32mm diameter. The clamp-on feature makes them easy and quick to use. Ideal for EMC compliance measurements as specified in CISPR and EN standards.

A current probe is used as a “pick-up” device for measuring RF current in single conductors or cable bundles when connected to the 50 Ω input of a radio frequency interference measuring receiver or spectrum analyser.

Direct connection to the conductor carrying EMI current is not necessary, since the probe may be opened for insertion of the conductor into the window of the toroid and then closed again to form a toroidal transformer with the conductor acting as a one-turn primary.

A correction factor graph is provided to convert measured μV to EMI μAs. When the EMI current is measured in dB above 1 μV as indicated on a conventional EMI meter, the correction factor will convert the measurement to dB above 1 μA. The correction factor is the inverse of the transfer impedance, Zt. Each probe is shipped with a graph of the correction factor versus frequency, keyed to the serial number on the probe.

current-probes1
  • For 32mm diameter cables
  • Ideal for EMC compliance measurements as specified in CISPR and EN standards
  • Suitable for frequency range 10KHz – 500MHz

Specification

(at 25ºC)

Model 9123 9145
Electrical
Bore size 32mm 32mm
Frequency range 10KHz – 500MHz 10KHz – 150MHz
Nominal Zt (ohm) 1-5 5
Max primary current (A) DC – 60Hz 200 350
Max primary current (A) 400Hz 200 350
Max primary current (A) RF (CW) 40 42
Max primary current (A) Pulse 60 100
Mechanical
Dimensions 115 x 73 x 38mm (excluding connector) 115 x 73 x 38mm (excluding connector)
RF Connectors Type-N
Environmental
Temperature 0º C to +50º C 0º C to +50º C
Operating Humidity 95% Non-condensing 95% Non-condensing