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Implemented measurement of leakage currents

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This commit is contained in:
ritt
2016-12-01 16:16:37 +01:00
parent dfe33dc32d
commit bcc7e30369
2 changed files with 103 additions and 18 deletions
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software/include/DRS.h
+1 -1
View File
@@ -641,7 +641,7 @@ public:
int GetTriggerDelay() { return fTriggerDelay; }
double GetTriggerDelayNs() { return fTriggerDelayNs; }
int SetSyncDelay(int ticks);
int SetReadoutDelay(int ticks);
int SetReadoutDelay(float milliseconds);
int SetTriggerLevel(double value);
int SetIndividualTriggerLevel(int channel, double voltage);
int SetTriggerPolarity(bool negative);
software/src/DRS.cpp
+102 -17
View File
@@ -2311,23 +2311,20 @@ int DRSBoard::SetSyncDelay(int ticks)
Read(T_CTRL, &reg, REG_TRG_DELAY, 2);
reg = (reg & 0xFF) | (ticks << 8);
Write(T_CTRL, REG_TRG_DELAY, &reg, 2);
return 1;
}
return 0;
}
/*------------------------------------------------------------------*/
int DRSBoard::SetReadoutDelay(int ticks)
int DRSBoard::SetReadoutDelay(float milliseconds)
{
unsigned int ticks = milliseconds * 30303;
if (fBoardType == 9) {
Write(T_CTRL, REG_READOUT_DELAY, &ticks, 4);
return 1;
}
return 0;
}
@@ -3036,9 +3033,10 @@ int DRSBoard::RAMTest(int flag)
int DRSBoard::ChipTest()
{
int i, j, tc, n_error, test_board;
int i, j, tc, n_error, test_board, t;
double freq, real_freq, max_freq;
float waveform[1024];
float waveform[1024], wf0[9][1024], wf1[9][1024];
double lc[9][1024];
int cell_error[9][1024];
Init();
@@ -3051,6 +3049,8 @@ int DRSBoard::ChipTest()
EnableTcal(0);
SelectClockSource(0);
printf("Chip test at %1.1lf deg. C\n", GetTemperature());
/* test 1 GHz */
SetFrequency(1, true);
StartDomino();
@@ -3089,7 +3089,7 @@ int DRSBoard::ChipTest()
j++;
if (j > 800) {
test_board = 0;
printf("Non-test board found, only even channels are tested.\n");
printf("Non-test board found, only even channels are tested\n");
}
/* read and check at 0 calibration voltage */
@@ -3100,7 +3100,7 @@ int DRSBoard::ChipTest()
while (IsBusy());
TransferWaves(0, 8);
for (i=0 ; i<8 ; i++) {
for (i=0 ; i<9 ; i++) {
tc = GetStopCell(0);
GetWave(0, i, waveform, false, tc, 0, false);
for (j=0 ; j<1024; j++)
@@ -3113,8 +3113,11 @@ int DRSBoard::ChipTest()
cell_error[i][(j+tc)%1024]++;
}
}
if (!test_board)
i++; // only even channels
if (!test_board) {
i++; // only channels 0, 2, 4, 6
if (i == 7)
break;
}
}
/* read and check at +0.5V calibration voltage */
@@ -3124,7 +3127,7 @@ int DRSBoard::ChipTest()
while (IsBusy());
TransferWaves(0, 8);
for (i=0 ; i<8 ; i++) {
for (i=0 ; i<9 ; i++) {
tc = GetStopCell(0);
GetWave(0, i, waveform, false, tc, 0, false);
for (j=0 ; j<1024; j++)
@@ -3137,8 +3140,11 @@ int DRSBoard::ChipTest()
cell_error[i][(j+tc)%1024]++;
}
}
if (!test_board)
i++; // only even channels
if (!test_board) {
i++; // only channels 0, 2, 4, 6
if (i == 7)
break;
}
}
/* read and check at -0.5V calibration voltage */
@@ -3149,7 +3155,7 @@ int DRSBoard::ChipTest()
while (IsBusy());
TransferWaves(0, 8);
for (i=0 ; i<8 ; i++) {
for (i=0 ; i<9 ; i++) {
tc = GetStopCell(0);
GetWave(0, i, waveform, false, tc, 0, false);
for (j=0 ; j<1024; j++)
@@ -3162,10 +3168,89 @@ int DRSBoard::ChipTest()
cell_error[i][(j+tc)%1024]++;
}
}
if (!test_board)
i++; // only even channels
if (!test_board) {
i++; // only channels 0, 2, 4, 6
if (i == 7)
break;
}
}
/* measure leakage current in all cells */
if (GetFirmwareVersion() < 30000)
printf("Please upgrade firmware to measure leakage current\n");
else {
memset(lc, 0, sizeof(lc));
EnableAcal(1, 0.5);
// measure at t=0
SetReadoutDelay(0);
StartDomino();
Sleep(10);
SoftTrigger();
while (IsBusy());
TransferWaves(0, 8);
tc = GetStopCell(0);
for (i=0 ; i<9 ; i++)
GetWave(0, i, wf0[i], false, tc, 0, true);
for (t=1 ; t<150 ; t+=1) {
SetReadoutDelay(t);
StartDomino();
Sleep(10);
SoftTrigger();
while (IsBusy());
TransferWaves(0, 8);
tc = GetStopCell(0);
for (i=0 ; i<9 ; i++)
GetWave(0, i, wf1[i], false, tc, 0, true);
// check if more than 500 mV lost
for (i=0 ; i<9 ; i++)
for (j=0 ; j<1024 ; j++) {
if (wf1[i][j] < 0 && lc[i][j] == 0) {
lc[i][j] = 0.15 * (wf0[i][j]-wf1[i][j])/t; // lc = C * delta_u / delta_t in [pA]
}
}
// check if all cells drained
if (test_board) {
for (i=0 ; i<9 ; i++)
for (j=0 ; j<1024 ; j++)
if (lc[i][j] == 0)
break;
if (i == 9 && j == 1024)
break;
} else {
for (i=0 ; i<8 ; i+=2)
for (j=0 ; j<1024 ; j++)
if (lc[i][j] == 0)
break;
if (i == 8 && j == 1024)
break;
}
}
// calculate statistics over leakage current
double sum = 0, lcmax = 0;
int n = 0, imax, jmax;
for (i=0 ; i<9 ; i++)
for (j=0 ; j<1024 ; j++)
if (lc[i][j] > 0) {
sum += lc[i][j];
n++;
if (lc[i][j] > lcmax) {
lcmax = lc[i][j];
imax = i;
jmax = j;
}
}
printf("Leakage current [pA]: %1.1lf average, %1.1lf max [%d/%d]\n", sum/n, lcmax, imax, jmax);
}
/* count errors */
for (i=n_error=0 ; i<9 ; i++)
for (j=0 ; j<1024 ; j++)