Optimum Vreset Values

Principal: dmkelly
Deputy: jstansberry
Data Monkey(s): The SSC will want to automate this process.
Priority: Necessary
Downlink Priority: Normal
Analysis Time: 24h
Last Updated:

Objective

Determine the optimum Vreset values and track these numbers to find the natural variance in these values and to look for drifts.

Description

Collect the Vrst optimization data from the campaign start-up and 
shutdown IERs.  Run through an automated tool for determining the
Vrst values.  Enter the Vrst values into a database, plot the data
versus time, and calculate the variance in values.  Determine whether
new Vrst values are needed, and if so, get them entered into the
irs-mips_pconst_ier.

Data Collected

mips_sur_C0F2N13


MIPS_MOBS_SCAN
# Set the Ge array bias voltages to 0 mV
sendcmd CELDHTGIF '3,0x80,"MIPS"'
sendcmd CELDHTGIF '20,0x81,"MIPS"'
# Initialize the array in preparation for taking data
sendcmd CEGERSTCON '127,127,4,"MIPS"'
sendcmd CESCANCON '"CHOP","REV",0,2048,2048,0,511,"MIPS"'
# Turn on the Ge flood stims in manual mode
sendcmd CEGESTIM '"MANUAL",8,"BON","BON","BOTHOFF",10,10,"MIPS"'
# Send the 12 CELDHTGIF commands needed to set the 70um and 160um
# voltages appropriately for the first exposure.
# pause 5 sec
# Collect 2 10s exposures in SUR mode
sendcmd CEMIPSUR 'AORID_upper,AORID_lower,0,"NO_COADD",9,2,"MIPS"'
# Repeat the CELDHTGIF and CEMIPSUR sequence for 12 more sets of Vrst values
# Restore 70um bias to 40mV, 160um bias to 30mV
sendcmd CELDHTGIF '3,0x91,"MIPS"'
sendcmd CELDHTGIF '20,0x8E,"MIPS"'
# Restore CEGESTIM to its nominal settings
sendcmd CEGESTIM '"AUTO",63,"BOTHOFF","BOTHOFF","BOTHOFF",10,10,"MIPS"'
# Restore nominal CEGERSTCON parameters
sendcmd CEGERSTCON '10,127,4,"MIPS"'
MIPS_BACKTO_MOBS

Data Reformatting Requirements

Array Data Desired:

All Array data

Data Reformatting Option:

Special Instructions:






Task Dependencies






Calibration Dependencies






Output and Deliverable Products

We will determine optimum Vrst values for the eight 70um and four 
160um modules.  These data will be compared with ground data and 
entered into a database.  We will produce plots showing the history
of Vrst values, including statistics on the variance of each voltage.
An assessment will be made after each campaign whether to update 
the Vrst values for the next campaign.



Data Analysis


Step-by-step analysis:
1) Reduce the Vrst optimization data using mips_sloper.
2) Determine the optimum Vrst values using a tool developed for this
   purpose.  
3) Enter the optimum Vrst values into a database along with relevant
   ancillary data and plot versus execution day and time.  Look for
   trends and offsets and determine whether different Vrst values 
   would be appropriate for the next campaign.
4) If new Vrst values are needed, take action to get these values
   entered into the CE MIPS/IRS patchblock for the next MIPS campaign.





Software Requirements







Actions Following Analysis

Check for the long-term stability of the Vrst values.  If there 
are drifts, determine the cause of the drifts and take action if 
necessary.  Determine whether new Vrst values are needed for the 
next campaign.  If so, get the new values entered in the 
CE MIPS/IRS patchblock.




Failure Modes and Responses

If we find regular drifts that occur during a campaign, we will 
have to accept that the bias on the arrays is changing with time, 
and we will have to select an appropriate bias voltage.  If we 
find a large and unpredictable variance in the optimum Vrst values,
we will simply select the median value and have to accept that the
bias will be different from one campaign to the next.  This will
limit our ability to combine data from different campaigns.  



Additional Notes


The following is a summary of the Vrst data from ground testing.  These
Vrst values were determined by human analysis; the analysis should be
repeated using an automated Vrst optimization tool.

#70um and 160um optimum Vrst values, CE1  
#(Viload=-1.1, CE2 or EMU' connected)
#
#Date   V70_1 70_2  70_3  70_4  70_5  70_6  70_7  70_8  160_1 160_2 160_3 160_4
#Offset 0x900 0x8E0 0x900 0x8D0 0x900 0x900 0x910 0x8F0 0x970 0x910 0x920 0x920
00-060    5     6     1     5     8    -3    -5     5   -99   -99   -99   -99
00-060_2  9    13    11    13    13     5     1     9   -99   -99   -99   -99
00-067   13    13     9    21    13     5     5    13   -99   -99   -99   -99
00-067_2 13    11     7    17    13     7     3    11   -99   -99   -99   -99
00-068    9     9     9    21    17     1     1    13   -99   -99   -99   -99
00-069   13    11     5    17    17     3    -1    11   -99   -99   -99   -99
00-119    7     9     9    13    13     3    -5    13    13    23    15     8
00-123    9     9     8    11    13     5    -2     9    12    22    14     7
00-351   17    22    19    31    25    13    19    27   -99    15    -6   -14
00-353   17    24    20    31    25    15    20    23   -99    17    -1   -13
01-117   11    20     9    19    19     2    15    17    -8     9    -8   -15
01-118    9    18     9    19    25     9    15    21   -12     9    -8   -14
01-120   11    22    15    13    23    10    14    21    -5    12    -2   -15
01-121   12    23    14    20    23    11    15    17    -8     9    -8   -15
01-121_2 11    22    14    19    22    10    15    21   -12     9    -8   -14
01-131   14    24    16    26    22    11    17    20    -4    13    -2   -11
01-220   19    26    24    27    22    13    16    20    -3    12    -1   -13
01-226   18    24    20    28    19    12    14    20    -2    11    -1   -12
01-286   13    20    13    19   -99   -99   -99   -99    -3    11    -2   -12
01-302   17    24    21    25    14     4     5    11    -1    12     1    -9
FltDef   14    23    16    23    22    11    16    21    -7    12    -4   -13

#70um and 160um optimum Vrst values, CE2  
#(Viload=-1.1, CE1 or EMU' connected)
#
#Date   V70_1 70_2  70_3  70_4  70_5  70_6  70_7  70_8  160_1 160_2 160_3 160_4
#Offset 0x900 0x8E0 0x900 0x8D0 0x900 0x900 0x910 0x8F0 0x970 0x910 0x920 0x920
00-075    5     1    -9     5     9     1   -13     1   -99   -99   -99   -99
00-076    5     1    -7     5     9     1    -9     1   -99   -99   -99   -99
00-077   10     1    -6     9    12     3   -11    -1   -99   -99   -99   -99   
00-124    5     6     4    10     9    -3    -5     5     0    -3    -5     1
00-126   -2     0    -3     7    -1   -12   -15    -4     2    -3    -4     3
00-356   11     9    10    25    26    14     7    18   -15    -8   -18   -14
01-116   12    10     1    17    26    14     7    16   -15    -8   -18   -11
01-116_2  5     9    -4    12    22    12     4    18   -17    -8   -18   -12
01-124    5     9    -6    14    17     5     3     8   -21   -12   -22   -13
01-129   11    11    -1    15    24    13     7    16   -13    -8   -17   -11
01-130   10     9    -2    12    23    11     4    12   -17   -10   -20   -12
01-222   11    13     6    20    21    12     5    11    -9    -3    -8   -12
01-230   13    12     0    23    20    11     1     9    -6    -3   -10   -12
01-265    4     5    -8    12    20     8     3    10   -22   -13   -22   -16
01-302   11    11    -2    16    14     4    -5    15    -9    -5   -12   -13
02-108   13    13     5    16    21    10     5    14   -14    -9   -16    -8
FltDef   10    10     0    17    23    11     5    13   -14    -8   -16   -12