Keysight Technologies N5444A Test Probe Accessory Kit, For Use With InfiniiMax Series

The Keysight Technologies probe head provides for a termination to a common DC voltage rather than to ground, which is required for many signal standards. It is implemented such that from DC to 1kHz the termination is 55 Ω to the termination voltage, and above 10 kHz the termination is 50 Ω to 0.9 times the termination voltage. The termination voltage range is ±4 V with a minimum step of 5 mV and a maximum current of 80 mA. The termination voltage can be controlled internally by the oscilloscope or applied externally using the supplied DC jack.

DC input resistance 55 Ω to Vterm
Input resistance at >10 kHz 50 Ω to 0.909 x Vterm

Datasheet - N5444A