APOLLO System Monitor Plots

Utah Air: Air temperature in the Utah box.
ILE Air: Air temperature in the Intermediate Level Enclosure.
Cabinet Air: Air temperature in the cabinet.
Dome Air: Air temperature in the dome.
ILE cool: When "ILE cool" is high, the exhaust fan in the ILE is on. When "Utah cool" is high, the fans in the heat exchangers in the Utah box are on.
Utah cool: When "Utah cool" is high, the fans in the heat exchangers in the Utah box are on.
Utah heat: When "Utah heat" is high, a 106 watt heater inside the Utah box is on.

Laser DI: The flow rate of the de-ionized water that flows into the laser. The dashed line indicated 0 gal/min.
PG Loop: Indicates the flow rate of the propylene glycol that flows in to the Utah box's heat exchanger. The flowmeter is kinda broken, so don't be surprised if the plot for this looks like noise.
HIGH / LOW alarms: And we have low/hi flow alarms for these two coolant loops. Again, the alarms for the PG loop don't work too well.

DAC: The 16 bit integer which sets the voltage that controls the internal oscillator frequency. The DAC varies to get the internal oscillator frequency to match the GPS frequency.
Phase (s): The instantaneous error between the XL-DC timing outputs and GPS. -5e-9 s, for example, indicates that the XL-DC timing was reported to be about 5 nanoseconds late.
Offset: The frequency offset with respect to GPS frequency, (f_osc - f_gps)/f. -2e-11, for example, indicates that internal oscillator is less than the GPS by about 2 parts in 10^11.
Drift: The change in oscillator frequency per day. 3e-12, for example, indicates that the internal oscillator frequency is changing positively with respect ot GPS by about 3 parts in 10^12 per day.