The pressure gauge on HAM6 was replaced due to noisy read back (spiked above high voltage pressure set point more than once causing fast shutter to close) and then gauge failure during troubleshooting (pirani or filament gone bad? - gauge sent back to manufacturer via RMA).

We replaced the entire gauge but the readback is still noisy. Suggest we leave the HV interlock on the new ion pump controller at HAM6 until we can trend gauge over longer period of time to confirm it won't spike above 1e-5 Torr. Not sure what is causing the spikes.