CHAPTER 4 Data acquisition
35
Table V. Effect of recorder range on the offset of the 10 V integrator output.
Range
Offset
pA
nA
µA
10%
20%
30%
40%
50%
10
0.1
0.01
1
2
3
4
5
20
0.2
0.02
2
4
6
8
10
50
0.5
0.05
5
10
15
20
25
100
1.0
0.10
10
20
30
40
50
200
2.0
0.20
20
40
60
80
100
500
5.0
0.50
50
100
150
200
250
1000
10.0
1.00
100
200
300
400
500
2000
20.0
2.00
200
400
600
800
1000
5000
50.0
5.00
500
1000
1500
2000
2500
1
10
1000 Integrator output (nA/V)
Although this may seem a complex way of compensating the background
current, in practise it gives the best possible flexibility and optimum resolution
of the 16 bits compensation in each operating range. By simply changing the
percentage offset or the recorder range, almost any offset compensation can
be set between 1 and 2500 mV on the integrator output.
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