 unbalanced resistance which exists between one bus and chassis ground. Estimating this latter composite resistance is desirable in order to more accurately determine the isolation.
One typical source of a balanced leakage resistance would be a hydrogen fuel cell vehicle, wherein a deionizer intended to remove ions from water being used as a coolant fails to maintain proper deionization. As ions build up, the conductance of the cooling water increases and the electrical isolation between both positive and negative fuel cell electrodes and ground is reduced. Another possible source of a balanced leakage resistance includes a symmetrical breakdown in cable insulation.

This invention relates to recording television programs, and more particularly, to systems for recording television programs selected from an interactive television program guide.
Cable, satellite, and broadcast television systems provide viewers with a large number of television channels. Viewers have traditionally consulted printed television program schedules to determine the programs being broadcast at a particular time. More recently, interactive electronic television program guides have been developed that allow television program information to be displayed on a viewer""s television.
Interactive program guides allow users to access television program listings in different display formats. For example, a user may desire to view a grid of program listings organized in a channel-ordered list. Alternatively, the user may desire to view program listings organized by time, by theme (movies, sports, etc.), or by title (i.e., alphabetically ordered).
A user may select a program for viewing or recording from the program guide. For example, the user may place a highlight region on top of a desired program listing and press a xe2x80x9crecordxe2x80x9d button on a remote control. Pay programs may be ordered by placing the highlight region on a pay program listing and pressing an xe2x80x9corderxe2x80x9d button. Some program guides allow parents to block cer