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Bias Ring Current
Carl Goodrich
2/26/08
2/26/08 Carl Goodrich- VELO Meeting 2
Sensor: 2552-10 Circuit: 1
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2552-10
Measurement:IV
Data from December
Vbias
Ground
2/26/08 Carl Goodrich- VELO Meeting 3
Sensor: 2552-10 Circuit: 3
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2552-10
Measurement:IV
Data from February
GroundVbias
2/26/08 Carl Goodrich- VELO Meeting 4
Total Current
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2552-10
Measurement:IIVVbias
Ground
Total Current: Bias Ring + Guard Ring
Data from January
2/26/08 Carl Goodrich- VELO Meeting 5
Sensor: 2552-14 Circuit: 1
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2552-14
Measurement:IV
Data from December
Vbias
Ground
2/26/08 Carl Goodrich- VELO Meeting 6
Sensor: 2552-14 Circuit: 3
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2552-14
Measurement:IV
Data from February
GroundVbias
2/26/08 Carl Goodrich- VELO Meeting 7
Total Current
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2552-14
Measurement:IIVVbias
Ground
Total Current: Bias Ring + Guard Ring
Data from January
2/26/08 Carl Goodrich- VELO Meeting 8
Sensor: 2552-11 Circuit: 1
0.00
50.00
100.00
150.00
200.00
250.00
300.00
350.00
400.00
450.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
S1
S2
L
Data from December
Sensor:2552-11
Measurement:IV
Vbias
Ground
2/26/08 Carl Goodrich- VELO Meeting 9
Sensor: 2552-11 Circuit: 1
0.00
50.00
100.00
150.00
200.00
250.00
300.00
350.00
400.00
450.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
S1
S2
L
Sensor:2552-11
Measurement:IV
Data from February
Vbias
Ground
2/26/08 Carl Goodrich- VELO Meeting 10
Sensor: 2552-11 Circuit: 3
0.00
50.00
100.00
150.00
200.00
250.00
300.00
350.00
400.00
450.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
S1
S2
L
Sensor:2552-11
Measurement:IV
Data from February
GroundVbias
2/26/08 Carl Goodrich- VELO Meeting 11
Total Current
0.00
50.00
100.00
150.00
200.00
250.00
300.00
350.00
400.00
450.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
S1
S2
L
Sensor:2552-11
Measurement:IIVVbias
Ground
Total Current: Bias Ring + Guard Ring
Data from January
2/26/08 Carl Goodrich- VELO Meeting 12
Sensor: 2535-8 Circuit: 1
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2535-8
Measurement:IV
Data from December
Humidity = 1.1%
Humidity = 8.3%, 9.4%
Vbias
Ground
2/26/08 Carl Goodrich- VELO Meeting 13
Sensor: 2535-8 Circuit: 1
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2535-8
Measurement:IV
Humidity = 12.2%
Humidity = 11.5%, 9.1%
Data from February
Vbias
Ground
2/26/08 Carl Goodrich- VELO Meeting 14
Sensor: 2535-8 Circuit: 3
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2535-8
Measurement:IV
Humidity = 9.4%
Humidity = 12.6%, 8.3%
Data from February
GroundVbias
2/26/08 Carl Goodrich- VELO Meeting 15
Total Current
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 200 400 600 800 1000 1200
Voltage (V)
Cu
rren
t (n
A)
SA
SB
L
Sensor:2535-8
Measurement:IIVVbias
Ground
Data from January
Total Current: Bias Ring + Guard Ring
Humidity = 8.0%
Humidity = 7.5%, 7.6%
2/26/08 Carl Goodrich- VELO Meeting 16
Conclusions
• Biasing the rubber pad seems to affect the IV curves in two ways:– Causes the current to gradually increase
especially after 600V– Increases the error
• Not as “pretty”
• More data to suggest that humidity affects the IV curves– However, higher humidity results in a lower
current???
