Quick Look at first 3-port data - Page 2
The above graphs are for Monday 11th March. The break in data collection was the period during which the instrument was offline for data to be transferred to another machine for processing and archiving. (By 25th March removeable/swappable hard discs were added to the system so that subsequent down-periods for this purpose need only last 5-10 mins.)
The above graphs are for Tuesday 12th March. One IQ demodulator ceased working in the early evening after everyone had gone home. This was not discovered until the next morning.
The above graphs are for Wednesday 13th March. After people started work in the lab it was noticed that one interferometer-pair was giving no output. Investigations established that this was due to an open contact at the input to an IQ demodulator. When the lead connecting to the demodulator unit was disconnected and re-connected the output re-appeared. At present it is not established why this occurred as the connector (SMA) seemed correctly tightened. It may be that the connectors are faulty, or that this is an effect of the water that has been leaking into the main RX box.
The above graphs are for Thursday 14th March.
The above graphs are for Friday 15th March. At approximately 10am there was a brief mains-power interruption. The computer continued to take data despite this transient event, and the main parts of the receiver system continued to operate. Unfortunately, the lab source we are using on a temporary basis as a second LO for the RX was reset by the mains event. Hence it went into standby and no LO power was provided until we noticed the problem later on and retyped into the oscillator the required frequency/power.
The above graphs are for Saturday 16th March.
Content and pages maintained by: Jim Lesurf (jcgl@st-and.ac.uk)
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University of St. Andrews, St Andrews, Fife KY16 9SS, Scotland.
