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Page 33
Logarithmic Output
The logarithmic output scale requires the user to convert the voltage output into a current
measurement. Current,
I
, as a function of the analog output,
V
, can be approximated by
where
V
is in volts and
I
is in amperes. For example, if
V
is equal to 4.903 V,
I
(rounded to the
nearest one) is approximately 8.0 × 10
-4
A or 800 μA. The lowest recommended voltage value for
accurate readings is 1 V.
lists sample output and corresponding current values.
Voltage [V]
Current
1.0
0.1 μA
2.0
1 μA
3.0
10 μA
4.0
100 μA
5.0
1 mA
6.0
10 mA
7.0
100 mA
8.0
1 A
Table 8.
Logarithmic output and calculated current values
