Real-time Monitoring with d10

Where

/home/mchost/evla/bin/d10

How

• d10 1 2

will show all available products for the baseline EA01-EA02, and will plot the correlation from baseband 0.

• Defaults to 8-bit

• Baseband and subband both default to 0. There are two timestamps on each line; the first is the time associated with the data as supplied by the CBE; the second is the time that the line is displayed.

• Products are displayed int eh order AA CC AC CA BB DD BD DB for the selected subband. Missing data will be represented with white space.

Options

• -baseband n: plot baseband n
• -cross: plot the cross hand correlation of the chosen baseband and its oppositely polarized pair.
• -subband n: to select a subband if more than one subband is being correlated in an IF pair.
• -noplot: to suppress plotting
• -3bit: to show 3-bit data (strange things happen if you try to look at 8-bit when taking 3-bit data and vice-versa!)
• -summary: to print a notice of each lag spectrum received
• -debug: to print the header of each lag spectrum received

• Baseband numbering follows the correlator convention, with A B C D used for 8-bit, and A1 C1 A2 C2 B1 D1 B2 D2 used for 3-bit:

Baseband	IF
0	A, A1
4	B, B1
2	C, A2
1	C1
3	C2
6	D, B2
5	D1
7	D2

Examples

• d10 -baseband 4 1 2 plots IF B
• d10 -baseband 0 -cross 1 2 plots A*C
• d10 -baseband 2 -cross 1 2 plots C*A
• d10 -subband 2 1 2 plots A*A from subband 2

Known limitations

• New scan warnings appear a few seconds before the affected data.
• d10 must be restarted if the CBE is reset (down, up) or restarted.
• Plotting interacts with the window manager in interesting ways (??!).
• I have seen focus move to the plot when the first plot appears, and seen selected text become un-selected everytime a plot appears. The -noplot switch can be handy if that is too annoying.
• One cause may be the correlator configuration. d10, by default, displays data for the subband labelled as 0, but I have seen OPT generated scripts which do not produce a subband 0. To check this d10 has "summary switch (d10 -summary 1 2) wich asks it to describe all the data it is getting. If inspection shows that there is no subband 0 data, then restart d10 asking for a subband which is present. (d10 -subband x 1 2). d10 reads data from the CBE into a buffer of length 100000, so will not work reliably if there are more than 8192 channels per subband. This can be changed if needed.

-- JosephMcMullin - 29 Mar 2010