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Model 6220/6221 User's Manual
DC Current Source Operation
3-5
Figure 3-2
Output boundaries (source and sink)
Output response
Output response is the time it takes for an output change to settle to within 1% of
its final value. For the Model 6220, output response (settling time) can be as fast
as 100µs (typical). For The Model 6221, output response can be as fast as 2µs
(typical) for the higher source ranges. If desired, the output response of the Model
6221 can be set to match the output response of the Model 6220 (both typically
100µs).
For the Models 6220 and 6221, an analog filter can be enabled to slow down the
output response. For a high-impedance load, the analog filter reduces overshoot,
excessive noise, and instability (oscillation).
Analog filter
The Model 622x has an analog filter that, when enabled, will slow down the output
response (settling time) of the current source.
When the analog filter is enabled, a capacitor (typically 33pF) is placed across the
output. Depending on the load impedance, the analog filter may or may not signif-
icantly increase the settling time of the current source.
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