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Model 6220/6221 User's Manual
DC Current Source Operation
3-7
Response speed setting (6221 only)
The filter response speed of the Model 6221 can be set for FAST or SLOW. For
the SLOW setting, the output response of the Model 6221 is the same as the out-
put response of the Model 6220.
The FAST setting allows a faster output response. The FAST response setting
changes the maximum output response bandwidth of the Model 6221 to 1MHz. It
also reduces stability. The output will remain stable into a 10µHz (typical) load. For
a more complex load, the faster speed may make the test system more suscepti-
ble to oscillation.
Note that output stability into an inductive load is only dependent on the response
mode setting and is not affected by the analog filter (on or off).
Again, experimentation may be the best way to determine which response setting
(FAST or SLOW) provides the best results.
Settling time specifications
The output "Settling Time" specifications are listed in
Appendix A
and assume that
the analog filter is disabled. For the Model 6221, settling times are provided for the
FAST and SLOW response speed settings. Note that the SLOW setting of the
Model 6221 has the same response as the Model 6220. Enabling the analog filter
may or may not significantly increase settling times. For details, see
"Analog
filter"
on page 3-5.
NOTE All settling times are typical into a resistive load to 1% of
final value.
The listed settling times in
Appendix A
are specified for a resistive load. The max-
imum load resistance for the specified settling times is calculated as follows:
Max Load Resistance = 2V / I
FULL SCALE OF RANGE
For example, on the 20mA range, the max load resistance is calculated as fol-
lows:
Max Load Resistance = 2V / 20mA = 100Ω
The settling times for other load conditions can be calculated as explained in
Section 3 of the Reference Manual (see "Settling time specifications").
Return to
Section 3 topics
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