QFilter¶ The QFilter is a low-pass filter module for cryogenic measurement setups. QFilter-II is the current generation; see the user manual for the full description of filter stages, connectors, and electrical specifications. Manuals¶ QFilter-II Manual (v2) Was this page helpful? Thanks for your feedback! Thanks for your feedback! Let us know how we can improve this page below. Want to tell us more? (optional) Submit