= PHOT_set_bias_volt =
The procedure '''PHOT_set_bias_volt''' reads the specified CALU table for the demanded group number. The numerical values corresponding to each named bias signal and group number (for instance bias 17, VSS-BU, for group N) are passed to the procedure PHOT_bias_group_N (N=1,2...6) which generates the relevant telecommands to the BOLC subsystem.

{{{
// Purpose       : Read a BOLObias calibration table and command bias
//                 voltages for the given group, viz.
//                 VDL-BU for Group 3. Will also establish VDD_PROT_BLU
//                 and VDD_PROT_CL before setting bias voltages
//
// CUS script    : Diego A. Cesarsky
//
// Arguments     :
// string  calTableName    The Cal table name, f.i. BOLObias or BOLOsafe
// string  BiasGR          The group number, BiasGRn (n:1, 2, ..6)
//
// Description   : Read Bias U-CAL tables in volts.
//                 Since BIAS are to be set in a predetermined order, the
//                 array biasOrder lists the preconised ordering.
//                 Prior to commanding the voltage generators, two voltages
//                 have to be switched ON with the operand
//
//                 0x0001 + 0x10000*BiasNum + 0x1000000*GroupNum
//
//                 and this for BiasNum 23, 22 and 21
//
// Version       : 0.3
// History       : 0.1   07-aug-2006; 1st version DAC
//                 0.1.1 22-aug-2006, KO, waitFor set to 1s everywhere
//                 0.2 17-oct-2006 DAC Had forgotten GND-BU
//                 0.3 13-nov-2006 DAC&TM Wait 3 sec after GND-BU
//
}}}
Input variables:
{{{
procedure PHOT_set_bias_volt {
    string calTableName = "PHOT_bias_low_direct"; // The U-Cal table [volts]
    int groupNb = 1 in [1,6]; // Requested group
}{
}}}
Since this procedure reads a CALU table, it is important to describe the format of the bias tables.
See below one of such tables. Note that the row headers (VH, VL, VRL, etc.), the column headers (BiasGR1, BiasGR2, etc.) and the Bias numbers (column Bias) are imposed. Only columns BiasGRn are to be edited.
{{{
# Bias table in volts: read by PHOT_set_bias_volt
# Based on the data when the detector was at 296 mK in average
# Flux on blue:  2.00 pW/pixel, Flux on red:  5.00 pW/pixel
# Bias on blue: 2.0 V, Bias on red: 1.5V
# Telescope primary miror at 82.55K with the emissivity of 3.44%
# KO: Thu Nov  9 18:49:45 2006
string   int    double    double    double    double    double    double
BiasID   Bias   BiasGR1   BiasGR2   BiasGR3   BiasGR4   BiasGR5   BiasGR6
VH        1     1.64812   1.64810   1.64811   1.64812   1.29143   1.29151
VL        2    -0.35188  -0.35190  -0.35189  -0.35188  -0.20857  -0.20849
VRL       3     0.31068   0.32806   0.31892   0.30252   0.35346   0.35552
VINJ      4     3.00000   3.00000   3.00000   3.00000   2.99940   2.99950
VCH       5     0.00000   0.00000   0.00000   0.00000  -0.00010  -0.00014
VDL       6     3.00000   3.00000   3.00000   3.00000   3.00350   3.00030
VSS       7     1.30000   1.30000   1.30000   1.30000   1.30000   1.30000
VGL       8     3.00000   3.00000   3.00000   3.00000   3.00330   3.00130
CKRLH     9     2.00000   2.00000   2.00000   2.00000   1.99940   1.99920
CKRLL    10     0.00016   0.00008   0.00012   0.00007   0.00004   0.00012
VDECX-H  11     2.00000   2.00000   2.00000   2.00000   1.99970   1.99990
VDECX-L  12     0.00002   0.00010   0.00004   0.00008   0.00035   0.00009
VSMS-H   13     0.00007   0.00025   0.00006   0.00015   0.00006   0.00011
VSMS-L   14     3.00000   3.00000   3.00000   3.00000   3.00140   3.00100
VGG      15     1.12000   1.09000   1.12000   1.12000   1.14050   1.14500
VDD      16     2.60000   2.60000   2.60000   2.60000   2.59930   2.60850
VSS-BU   17     1.50000   1.50000   1.50000   1.50000   1.50010   1.49900
VDL-BU   18     4.20000   4.20000   4.20000   4.20000   4.19420   4.19870
VGL-BU   19     2.55000   2.55000   2.55000   2.55000   2.49890   2.49960
VH-BLIND 20     2.15758   2.20306   2.16588   2.16617   2.20890   2.20416
}}}