Seal mode bugs

[campagnola]

Some bugs encountered in seal mode that may or may not be related:

• When crossing the 100 MΩ threshold, holding should switch to -70 mV. Sometimes this doesn't happen, and it may be related to the auto bias being on or off.
• When crossing the 1 GΩ threshold, sometimes the state doesn't transition to cell attached

Related: I think the auto bias button should not affect the holding potential when in VC mode, but currently that might not be the case. The options while in VC should be:

• "off" -> no auto bias is applied when switching to IC
• "VC" -> when switching to IC, the VC holding potential is used as the initial auto bias value
• "manual" (maybe?) user manually sets the auto bias value

[jessicatrnh]

This is related to task #208

[jessicatrnh]

Noted issues with seal feature 02/27/2024

[jessicatrnh]

Still seeing issues with -1kPa not being applied continuously when seal function is enabled. Auto mode switch between regulator and atmospheric with brief pulses of -1kPa in regulator over 5 iterations. ~5 seconds in A mode and brief switch to R mode. -70mV not applied when 100MOhm reached.

state defaults to "fouled" when seal feature fails.

[outofculture]

Issues aren't seen when seals happen quickly. Workaround is to re-enter Seal mode multiple times. Holding gets turned off completely if seal fails. Test pulse analysis needs to be improved to better handle "next state" behavior. The switching to Atmosphere is the worst of the current behaviors.