Model 6220/6221 Reference Manual
DC Current Source Operation
3-5
Return to
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.
For example, assume the Model 6221 is on the 2mA range and FAST response is
selected. For this configuration, the settling time is specified at 2µs (typical). Also
Quadrant I
Source
Quadrant II
Sink
Quadrant III
Source
Quadrant IV
Sink
105mA
-105mA
105V
-105V
+I
-I
-V
+V
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Summary of Contents for 6220
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