DC HV TEST STAND LOG

Auxilliary Tests

Prior to the normal suite of tests, the 1469 modules were set (at default trip currents) to 3500 volts, without loads, for several hours.  Tbis was done to assure that an infrequent trip problem noted in the prototypes was no longer present in the new moduels.

Test date:  17 February, 1999
Test Adminsitered by :   Julia Velkovska and Ryan Roth                     Number of Modules Tested:  12 (12 of 21)
Module Type:  1469N                                                                                     Sub-System:  DC
Test Database Name: 02.17.17.29.25                                                        Test Database FileName:  02.17.17.29.25.TheDB.DB

Long Term Test Run From  18:18:34 to 09:36:10           LT Voltage = -3500V

Non-Load LT Channel Trip = -0.25 uA                          Non-Load LT Bulk Trip = -10 uA

Load LT Channel Trip = -5 uA                                         Load LT Bulk Trip = -40 uA
 

Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
**************************************************************************
B67764                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B67723                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B51184                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B67754                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B67732                Bulks 00 - 02    No            Yes        No
                      Chans 00 - 23    Yes(1)

B67742                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B51225                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B67766                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B51185                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B67774                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B67739                Bulks 00 - 02    No            Yes        No
                      Chans 00 - 23    Yes(2)

B67731                Bulks 00 - 02    No            Yes        Yes
                      Chans 00 - 23    Yes(2)

**************************************************************************

Notes:

  1. The first channel of the first bulk supply (B67732_00) fails to deliver current to the load, and voltage cannot be detected on its pin.
  2. These modules, while they did not cause errors during testing, have pins which seem to be either bent or extended outward from their connectors, indicating that the internal solder connections may not be acceptable.
  3. During the Long Term test, several modules had infrequent trips.  These trips diminished in occurance as time past.  Here is a set of plot of their voltage during the long term test.
First Set of DC Trips

Test date:  18 February, 1999
Test Adminsitered by :   Julia Velkovska and Ryan Roth                     Number of Modules Tested:  9 (9 of 21)
Module Type:  1469N                                                                                     Sub-System:  DC
Test Database Name: 02. 18.10.02.49                                                       Test Database FileName:  02.18.10.02.49.TheDB.DB

Long Term Test Run From  14:08:51 to 9:45:14             LT Voltage = -3500V

Non-Load LT Channel Trip = -0.25 uA                          Non-Load LT Bulk Trip = -10 uA

Load LT Channel Trip = -5 uA                                         Load LT Bulk Trip = -40 uA
 

 Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
**************************************************************************
B67768                Bulks 00 - 02    No            Yes(3)     No
                      Chans 00 - 23    No

B67725                Bulks 00 - 02    Yes(1)        Yes        No
                      Chans 00 - 23    No

B67772                Bulks 00 - 02    Yes(2)        Yes        No
                      Chans 00 - 23    No

B67727                Bulks 00 - 02    No            Yes(3)     No
                      Chans 00 - 23    No

B51227                Bulks 00 - 02    No            No         No
                      Chans 00 - 23

B67773                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B67749                Bulks 00 - 02    No            Yes(3)     No
                      Chans 00 - 23    No

B51245                Bulks 00 - 02    No            No         No
                      Chans 00 - 23    No

B51251                Bulks 00 - 02    No            No         Yes
                      Chans 00 - 23    No

**************************************************************************
 

  • Notes:
    1. B67725_02 bulk supply voltage dead zone was exceeded  set to 3 V , but variatrions of 5 V were detected. See picture below
    2. Bulk trip, B67772_00.
    3. Loose pins on blue connectors.
      During the Long Term test, several modules had infrequent trips.  These trips diminished in occurance as time past.  Here is a set of plot of their voltage during the long term test.
       

      DC 1469N trips



       
    Test date:  22 April, 1999
    Test Adminsitered by :   Ryan Roth                                                            Number of Modules Tested:  4 (1-4)
    Module Type:  1471N                                                                                     Sub-System:  DC
    Test Database Name: 04.22.13.19.23                                                        Test Database FileName:  04.22.13.19.23.TheDB.DB

    Long Term Test Run From  13:25:01 22 April to 08:41:42 23 April            LT Voltage = -4800V

    LT Regular and Peak Trip Current = -7 uA                                                 LT Loads = 1 GOhm

    Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
    **************************************************************************
    B68137                Chans 00 - 07    No            No         Yes

    B68009                Chans 00 - 07    Yes           Yes(1)     Yes

    B67828                Chans 00 - 07    No            No         Yes

    B68114                Chans 00 - 07    No            No         Yes

    **************************************************************************

    Notes:

    1. Channel B68009_00 consistantly produced a current that was more than 1 uA greater than the other channels.  Channel B68009_02 consistantly produced a voltage that was more than 4V greater than the demand, and was never adjusted to be within the Measuered Voltage Dead Zone.  In addition, this module has a High Voltage Limit of -5054, which must be corrected to be below 5kV before it can be used.  This module has been set aside.
     Below is a set fo graphs of the two faulty channels.  B69009_00 shows proper voltage behavior, but poor current behavior.  B68009_02 shows but poor voltage behavoir, and acceptable current behavior (the elataved voltage doesn't create enough of a difference to be noticable).  Note the elevations in current and voltage in either case.
    DC1471N_1.gif
    Test date:  23 April, 1999
    Test Adminsitered by :   Ryan Roth                                                            Number of Modules Tested:  4 (5-8)
    Module Type:  1471N                                                                                     Sub-System:  DC
    Test Database Name: 04.23.09.11.09                                                        Test Database FileName:  04.23.09.11.09.TheDB.DB

    Long Term Test Run From  09:31:58 23 April to 16:33:55 23 April            LT Voltage = -4800V

    LT Regular and Peak Trip Current = -7 uA                                                 LT Loads = 1 GOhm

    Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
    **************************************************************************
    B68351                Chans 00 - 07    No            No         Yes

    B68135                Chans 00 - 07    No            No         Yes

    B68136                Chans 00 - 07    No            No         Yes

    B68013                Chans 00 - 07    No            Yes(1)     Yes

    **************************************************************************

    Notes:

    1. This module, B68013, has a modified HVL that exceeds the required 5kV limit.  It will be sent with others to be re-modified at Physics -- there is no need to send it back to LeCroy.
    Test date:  2 June, 1999
    Test Adminsitered by :   Ryan Roth                                                           Number of Modules Tested:  4 (9-12)
    Module Type:  1471N                                                                                     Sub-System:  DC
    Test Database Name: DC.06.02.13.53.38                                                  Test Database FileName:  DC.06.02.13.53.38.TheDB.DB

    Long Term Test Run From  14:10:32 2 June to 09:30:54 3 June                   LT Voltage = -4800V

    LT Regular and Peak Trip Current = -7 uA                                                 LT Loads = 1 GOhm

    Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
    **************************************************************************
    B68939                Chans 00 - 07    No            No         Yes

    B68048                Chans 00 - 07    No            No         Yes

    B68943                Chans 00 - 07    Yes           Yes(1)     Yes

    B68972                Chans 00 - 07    No            No         Yes

    **************************************************************************

    Notes:

    1. Channel B68943_01 developed 18 Peak Current Trips during long term testing; compared to the other channels of this type, this is excessive.  This module is being set aside; a graph of its voltage is shown below.
    Channel B68943_01
     Test date:  3 June, 1999
    Test Adminsitered by :   Ryan Roth                                                           Number of Modules Tested:  3 (13-15)
    Module Type:  1471N                                                                                     Sub-System:  DC
    Test Database Name: DC.06.03.16.18.54                                                  Test Database FileName:  DC.06.03.16.18.54.TheDB.DB

    Long Term Test Run From  16:20:16 3 June to 08:41:22 4 June                   LT Voltage = -4800V

    LT Regular and Peak Trip Current = -7 uA                                                 LT Loads = 1 GOhm

    Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
    **************************************************************************
    B68027                Chans 00 - 07    No            No         Yes

    B68008                Chans 00 - 07    No            No         Yes

    B67826                Chans 00 - 07    Yes           Yes(1)     Yes

    **************************************************************************

    Notes:

    1. Channel B67826_02 consistently yielded a voltage 4 Volts higher than demand, while its MVDZ was set at 1.1 V.  It is being set aside.
     Test date:  21 June, 1999
    Test Adminsitered by :   Ryan Roth                                                           Number of Modules Tested:  3 (16-18)
    Module Type:  1471N                                                                                     Sub-System:  DC
    Test Database Name: DC.07.21.09.42.41                                                  Test Database FileName:  DC.07.21.09.42.41.TheDB.DB

    Long Term Test Run From  09:56:39 21 June to 02:01:12 22 June                       LT Voltage = -4800V

    LT Regular and Peak Trip Current = -7 uA                                                        LT Loads = 1 GOhm

    Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
    **************************************************************************
    B68040                Chans 00 - 07    No            No         Yes

    B68004                Chans 00 - 07    No            No         Yes

    B68017                Chans 00 - 07    No            No         Yes

    **************************************************************************

    Notes:

    1. No module problems; however, the long-term test was stopped early due to a non-module problem, so only the first 16 hours of data in the database are valid.  Since the modules displayed no problem whatsoever, it was decided that this length of testing was sufficient.
    Test date:  22 June, 1999
    Test Adminsitered by :   Ryan Roth                                                           Number of Modules Tested:  3 (19-21)
    Module Type:  1471N                                                                                     Sub-System:  DC
    Test Database Name: DC.07.22.09.49.14                                                  Test Database FileName:  DC.07.22.09.49.14.TheDB.DB

    Long Term Test Run From  10:12:10 22 June to 10:39:59 23 June                        LT Voltage = -4800V

    LT Regular and Peak Trip Current = -7 uA                                                         LT Loads = 1 GOhm

    Module Serial#        Channel Name    Errors?     Set Aside?   LT Load?
    **************************************************************************
    B68035                Chans 00 - 07    No            No         Yes

    B68039                Chans 00 - 07    No            No         Yes

    B68370                Chans 00 - 07    Yes (1)       Yes        Yes

    **************************************************************************

    Notes:

    1. Channels B68370_01 and B68370_03 each consistantly delivered higher than required voltages during the long-term test.  The voltages were elevated by five and eleven volts, respectively; the voltage deadzone was set a 1.2 Volts.  This module is being returned  to LeCroy for repair.