[Lee, Jeff, Daniel]

We plugged in the ion pump controller to a wall outlet and read the current from the wall outlet to the ion pump controller as 0.03 A. The voltage from the BNC on the front of the controller was 9 V.

The pressure was 2.5E-7. We hit enable and the on button around 2:40 PM. The pressure jumped to 1E-4 Torr and then quickly dropped. The BNC voltage dropped to 2 V before slowly rising to around 3.1 V. The controller drew 0.7-0.9 A. There was no need to repeatedly hit the on button; the ion pump stayed on and did not trip.

At 4:28, the pressure was 1.9E-7 Torr. I shut the gave vale to the turbo pump and the pressure rose to 3.3E-7 Torr. I turned off the turbo pump and the pressure again jumped to 3.8E-7 Torr. By 4:47 PM, the pressure was 4.7E-7 Torr. No turbo pump speed was given and it sounded quiet, so I turned off the scroll at 4:49 PM. The BNC voltage was 3.95 V.

By 4:54 PM, the pressure was 5.1E-7 Torr and the BNC voltage was 3.93 V.

After turning the turbo off, I believe I enabled a setting so that the turbo speed will be displayed as its spinning down. The controller is unfortunately hard to use.

I will monitor the pressure in the coming days. If the pressure approaches 1E-4 Torr, I am going to turn off the ion pump to protect it.

Going forward, it might be nice to add a valve to the ion pump so that all systems can be vented nicely. Maybe one of these up-to-air valves (cheaper than on Lesker) and a CF Tee.