I-14 Applications Guide Model 6485 Picoammeter Instruction Manual
Figure I-11
Transient Voltage
When it is necessary to up-range during auto-ranging operation, multiple ranges may be
crossed to find the correct range. The duration of the transient in Figure I-11 can be
extended in this case, but the magnitude will not increase significantly.
Down-range voltage transients are smaller
With the exception of the change from the 2mA range to the 200µA range, the down-range
voltage transient is significantly smaller than the up-range transients. Figure I-12 shows
the voltage presented at the input, measured during a change from 20µA to 2µA with a
2µA input current. The vast difference from the previous figures in voltage scale and time
scale should be noted. Note also that the current limiting resistor will be that of the 2µA
range, 100 times greater than upranging across the same boundary. The voltage transient
of the 2mA to 200µA change with a 200µA input signal is similar to the up-range
response, with the exception that the current limiting R will be 100 times greater in the
case of down-ranging.
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