Settling times for the SR-570 Preamplifier #910
Conversation
|
By the way, this PR does add a lot of tests (~72), but they're parameterized and run in under a second. Hopefully that's okay. They basically test all the possible combinations of gain values. |
canismarko
force-pushed
the
gain_settling
branch
from
8b1c708
to
b9f6b87
Compare
Co-authored-by: Pete R Jemian <prjemian@users.noreply.github.com>
| return super().set(value, timeout=timeout, settle_time=_settle_time) | ||
|
|
||
|
|
||
| class GainSignal(GainMixin, EpicsSignal): |
There was a problem hiding this comment.
Is it necessary to separate the code of GainMixin from GainSignal? In addition to the use here, will the mixin be used somewhere else?
There was a problem hiding this comment.
It was originally going to be used in a pcdsdevices MultiDerivedSignal class. I re-factored it to no longer need it that way. Happy to re-combine the mixin with the signal.
There was a problem hiding this comment.
Better to recombine if you do not see an additional use.
|
All tests pass locally. Noting that $ git grep GainMixin
apstools/devices/srs570_preamplifier.py:class GainMixin:
apstools/devices/srs570_preamplifier.py:class GainSignal(GainMixin, EpicsSignal): |
|
|
||
| Used to introduce a specific settle time when setting to account | ||
| for the amp's R–C relaxation time when changing gain. | ||
|
|
There was a problem hiding this comment.
this blank line can be deleted
| -------- | ||
| Signal.set | ||
| EpicsSignal.set | ||
|
|
There was a problem hiding this comment.
Is this blank line needed?
|
|
||
| Used to introduce a specific settle time when setting to account | ||
| for the amp's R–C relaxation time when changing gain. | ||
|
|
There was a problem hiding this comment.
Is this blank line needed?
canismarko
force-pushed
the
gain_settling
branch
from
8e82a97
to
dc5bdc2
Compare
|
I got rid of the GainMixin class. And also the _settle_time method since it's a static method and works just as well as a function. Assuming the tests pass, I think this is good? |
There was a problem hiding this comment.
LGTM! @canismarko - Please press the big green Merge button.
When changing gain on the SR-570 pre-amp, the voltage output spikes momentarily, and then settles down. Lower gain values settle faster. This PR adds a settling time to gain-related signals that depends on the target gain, based on measurements of the pre-amps at sector 25-ID-C. Presumably, other SR-570 preamps should be similar.
Fixes #906