The F-140A injection probe includes the F-140 and a "matching network". The matching network is used to change the impedance of the F-140 to a nominal 50 ohm between 100 KHz and 1 MHz thereby reducing the amplifier output required to perform testing. The F-140A matching network has a broader frequency range than the F-140. TheF-140 has an insertion loss of less than 6 dB between 150 KHz and 350 MHz and an input power rating of 100 watts for 30 minutes