Tektronix a621 a622 current probes tektronix a622 the tektronix a622 is a 100a acdc current probe this long nose style clamp on probe uses a hall effect current sensor to provide a voltage output to oscilloscopes it has a bnc connector and can be used with a shrouded banana plug adaptor so it can also be used on digital multimeters tekmeterreg and oscilloscopes the a622 can measure acdc currents from 50ma to 100a peak over a frequency range of dc to 100khz the probe provides 10mv