Specifications

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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