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--- blog:blogkatherine_maintanance_trip_june_15-24 [2014/06/23 10:25]
liza [Ke maintanance trip]
+++ blog:blogkatherine_maintanance_trip_june_15-24 [2014/06/27 06:09] (current)
Brett Reid [Ke maintanance trip]
@@ Line 6: / Line 6: @@
 Done:
- -  mk5's are supplied with new Smart power supplies: mk5ke with 1200W, mk5-2ke with 850W. Originally they were 550W units.
+ - mk5's are supplied with new Smart power supplies: mk5ke with 1200W, mk5-2ke with 850W. Originally they were 550W units.
- -  mk5ke and mk5-2ke were successfully tested for recording and conditioning with two 16-TB modules.
+ - mk5ke and mk5-2ke were successfully tested for recording and conditioning with two 16-TB modules.
- -  mk5ke and mk5-2ke: recording, conditioning, autocorrelation, bit stats and pcal tests (pcalmon) were performed with both mk5's, swapping VSI cables and FILA OUT VSI outputs.
+ - mk5ke and mk5-2ke: recording, conditioning, autocorrelation, bit stats and pcal tests (pcalmon) were performed with both mk5's, swapping VSI cables and FILA OUT VSI outputs.
- -  Pcal 5-MHz filter: tested, found to create fast phase wrap and introduce spurious signal in channels 5, 15, 16, thus discarded (pic -- pcalmon output graphs). This was the crystal filter that Eric tested and improved.
+ - Pcal 5-MHz filter: tested, found to create fast phase wrap and introduce spurious signal in channels 5, 15, 16, thus discarded (pic -- pcalmon output graphs). This was the crystal filter that Eric tested and improved.
- -  Pcal: pcal 5-MHz signal comes now directly from the maser (5MHz - 2 connector) through 12-dB attenuator, bypassing the 5-MHz distributor. Levels regulated at the feed: added 3-dB attenuator to S-band, current attenuation at the feed is 15dB in S-band, 0dB in X band. Amplitudes of the pcal signal before DBBC: X-band ~18dB, S-band ~15dB, with spec an set to 10 KHz span, sample count 10 in averaging. 350 MHz for S, 1.1 GHz for X.
+ - Pcal: Searched for spurious signals at image frequencies in S band, nothing found.
- -  DBBC: FILA OUT and Core2 boards inspected, connections checked. Secured VSI cables inside the DBBC with cable holders in order them not to pull on the VSI connectors.
+ - Pcal: pcal 5-MHz signal comes now directly from the maser (5MHz - 2 connector) through 12-dB attenuator, bypassing the 5-MHz distributor. Levels regulated at the feed: added 3-dB attenuator to S-band, current attenuation at the feed is 15dB in S-band, 0dB in X band. Amplitudes of the pcal signal before DBBC: X-band ~18dB, S-band ~15dB, with spec an set to 10 KHz span, sample count 10 in averaging. 350 MHz for S, 1.1 GHz for X.
+ - DBBC: FILA OUT and Core2 boards inspected, connections checked. Secured VSI cables inside the DBBC with cable holders in order them not to pull on the VSI connectors.
 Problems revealed:
- -  mk5ke: pcal signal extracted from the data recorded with mk5ke is "stuck" at one level, doesn't vary with time (under the same conditions the signal from mk5-2ke looks "naturally"). Problem is nether related to a cable nor to the VSI connectors on FILA OUT. VSI IN connector on the back of mk5ke?
+  - mk5ke: bank B back plane failure. Affected disks 4/5 and 6/7. Do not use for conditioning.
+  - mk5-2ke: module doesn't go all the way in to bank B.
+  - DBBC: "stuck bit" and bit statistics problems related to VSI OUT connectors: ch15 (S) with VSI1 (rear) -- was problematic from the beginning, ch5 (X) with VSI2 (front) emerged after the inspection and refitting of FILA OUT board.
+ - DBBC: suppresses the amplitude of 10-kHz pcal tone (first) in each band.
- -  mk5ke and mk5-2ke: refuse to condition just one module. Always conditions module in bank B when two modules are in, both VSN's are lost. Recommendations for use: when conditioning, put the module to be conditioned in bank B. Put  dummy erased module in bank A. Condition as normal. Swap modules if necessary. After conditioning, repair electronic VSNs of both modules.
+ - Maser: replaced the 'switches' unit and AC/DC converter, cavity tuning and frequency adjustment performed, new standby batteries were installed.
- -  Pcal: all tones over the passband are visible on spectrum analyser, but 10-kHz are suppressed by DBBC (pic pcalmon output).
+**Status:**
- -  DBBC: "stuck bit" and bit statistics problems related to VSI OUT connectors: ch15 (S) with VSI1 (rear) -- was problematic from the beginning, ch5 (X) with VSI2 (front) emerged after the inspection and refitting of FILA OUT board.
+ - mk5-ke is a main recorder connected to VSI2 on FILA OUT. Channel 5 have a stuck bit.
+ - 5MHz signal for pcal is connected directly to the second output of the maser through the synch port.
- -  DBBC: suppresses the amplitude of 10-kHz pcal tone (first) in each band.
- -  Modules: hob+025/6000 has fault in disks 6/7; bkg-0015/1480 took forever to condition. Are labelled as broken and prepared for repair. bkg-0015/1480 should be reprofiled into higher capacity disk.
- -  Maser: replaced the 'switches' unit and AC/DC converter, cavity tuning and frequency adjustment performed, new standby batteries were installed.
 {{tag> backend}}
@@ Line 62: / Line 64: @@
  - Control room: mk5 light for reading module labels is no longer connected to exterior light switch on ipske. It now switches on ''pdu1ke.phys.utas.edu.au'' and is labelled ''light int''
+ - Installed 2 of power distribution units (PDU). These are like an 8 way power board that have individually switched outputs. They can be switched from a web interface at the following 2 links:
+\\ [[http://pdu1ke.phys.utas.edu.au/outlet.htm|pdu1ke.phys.utas.edu.au/outlet.htm]]
+\\ [[http://pdu2ke.phys.utas.edu.au/outlet.htm|pdu2ke.phys.utas.edu.au/outlet.htm]]
+The user is admin and the password is the same one we use for the internet power switches.
+\\ PDU1KE so far has wifi, cduke (network maint computer) and the interior light.
+\\ PDU2KE so far has mk5-2ke and the GPIB controller.

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