IFLO SYSTEM  Problems

dec 10

Notes:


Problems with the if/lo system:


date
 dev
 Notes
101112 rfattnB rfattn polB switching error:
101206
 rfattnB
 rf attenuator polB error. 87130 readback of attenautor position times out.
Later in the day tried switching and found no problems.
errMsg in /share/obs4/msgs/dtmsgs:
Dec  6 07:38:24 da :if1Prog:E:4240002:hp87130Err:swNum: 19 hpErr1:  1006 hpErr2:     0
120128
 87130
 not communicating over gpib
error
Jan 28 01:36:02 da :hp87130OpcWait:E:3f7000b:    0b is a timeout on wait for reply
-When we went up saw the error red led on all the time, the switching light was always on.
-Cylcing the 87130 power made no difference error light stayed on.
- replaced87130 with  spare .. worked ok
- brought bad 87130 down to rcvr room .. plugged it into gpib bus (disconnected upstairs) and it started to work.
--> so 87130 without driving any switches is probably ok
120207
 rfattnB
 -Errmsg:
Feb  7 05:25:24 da :if1Prog:E:4240002:hp87130Err:swNum: 19 hpErr1:  1006 hpErr2:     0
- This occurred 5 times till 7am.
- this also occurred on 23jan12 once.
-swNum 19 is rfAttn polB
-uses 87130 card3 using chan 12 - 15 (count from 1)
hpErr1 1006: (see 87130 manual 4-45 ERRor? command)
1006,Channel timeout <17 hex digits>
This error is generated when a relay apparently fails to switch, based on the
detected state of the sense lines. The 17 hex digits indicate which card and
which of the 32 channels experienced failures just as for error 1001. Each
channel has two associated bits; the leftmost indicates that the error was
detected on the CLOSED side of the relay; the rightmost that the error was
detected on the OPEN side. A failure is indicated with a 1.
❍ A Channel timeout without an accompanying Sense error
    indicates that the sense lines were in a valid state, but it was the
    wrong state.
❍ A Channel timeout with a Sense error indicates that both sense
     lines appeared to be at 0 V.
❍ A Sense error without a Channel timeout means both sense lines
     appeared to be at 24 V.

Since we had hpErr2=0 .. (no sense error) then the sense lines were ok but it was the wrong state.
(didn't switch).Historically we've had  problems with this combination of 87130 channels and attenuator..
181130
 87130
 started getting errmsg:
if1Prog:E:4240002:hp87130Err:swNum:  8 hpErr1:  1001 hpErr2:  1006
  • This is a sense failure.. sense lines in an illegal state.
  • tried switching some cables between switches upstairs, didn't help
  • Tried opening, closing all channels on card 1 for tesing..
    •  (probably a dumb thing to do since some of the switches only want one channel at a time selected
  • Ended up getting :
  • Nov 30 14:38:26 da :if1Prog:E:4240002:hp87130Err:swNum:  1 hpErr1:  1001 hpErr2:  1006
    Nov 30 14:38:26 da :if1Prog:E:4240002:hp87130Err:swNum:  2 hpErr1:  1001 hpErr2:     0
    Nov 30 14:38:26 da :if1Prog:E:4240002:hp87130Err:swNum:  5 hpErr1:  1001 hpErr2:     0
    Nov 30 14:38:26 da :if1Prog:E:4240002:hp87130Err:swNum:  7 hpErr1:  1001 hpErr2:  1006
    Nov 30 14:38:26 da :if1Prog:E:4240002:hp87130Err:swNum:  8 hpErr1:  1001 hpErr2:     0
  • these are all on card 1.
  • put a spare driver card in board 1.. no help
  • found that the power supply to the 87130 was only outputing .5 volts.
  • Took the spare 87130 that was downstairs, and installed it.
  • Ran tsysall and it worked fine...
  • 1 hour later it started failing with
    • Nov 30 18:26:58 da :hp87130OpcWait:E:3f7000b:
    • This is a timeout..
    • ran diagnostic. no longer communicating on the gpib bus
This is the same error as 120128 above. I think what happened was:
  • 87130-1 had comm errors 120128.. brought down to lab
  • 87130-2 installed 120128 -> 181130 then power supply fail
  • 120128.. 87130-1 not communicating on gpib bus
    • installed 87130-2 in dome.. worked ok
    • brought 87130-1 down to electronics.. tested it , and it worked ok
  • 181130.. 87130-2 power supply failed
    • we brought it down, and installed 87130-1 in dome
    • After 1 hour it  started to give the same results at 120128...
      • So maybe it fails after it heats up ?
  • 181201:
    • 87130-1.. took com board from 87130-2 and installed in 87130-2
      • ran for awhile then started hanging again.. (all lites on 87130 front panel on.)
    • brought downstairs.. checked power supply ok, back up stairs
    • the gpib cable connector on the back was not mating the cable flush with the chassis. felix tightened it.
    • wrote ifsetuploop (in ./diag). loops doing ifsetup for all possible rcv setups.
    • With chassis open upstairs. ran a few complete loops. Felix monitored the 24 volts.. it was stable.
      • no errors
    • reinstalled in racks.. continued running ifsetuploop  11:25 ->
190111
 if/lo
 loose cable downstairs if/lo polA, subband 2. (more info)
200603
 if/lo
 synth 4 fixed freq 550mhz 16:15 03jun20 through 9:00 08jun20




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