A.H. Systems CPF-631 Manual de instruções - Página 10

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A.H. Systems Injection Current Probe Series

ANTENNA FORMULAS AND CALCULATIONS

A specific Transfer Impedance Factor is associated with each frequency. This number is

to be subtracted from the receiver reading in order to convert to dBuA

dBA = dBV (from Receiver) - Transfer Impedance (dB) + cable Loss (dB)

EXAMPLE:

Assume that the frequency of interest is 80 KHz and we need to find the current at

this frequency. Connect the probe per figure 1

Frequency: 80 KHz

Transfer Impedance: -2.76 dB ohms

Cable Loss: 0.1dB

Receiver Reading: -33.0dBuV

dBA = dBV (from Receiver) - Transfer Impedance (dB) + cable Loss (dB)

dBA =

dBA = -30.34

When injecting current:

Injection current (dB) = Input current (dB) - Insertion loss (dB) - Cable loss

Maximum power rating : 100 Watts for 30 minutes

Do not handle injection probe while testing is in progress.

Hazardous voltages may be present.

 A.H. Systems inc. – January 2017

REV B

-33.0

-2.76

- 0.1