Fix DynaCool driver init and temperature_setpoint cache update#8097
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- block_while_ramping_temperature: use set_cmd=None/get_cmd=None so the parameter is settable instead of read-only (set_cmd=False rejected the supplied initial_value). - blocking_t_state_check_interval: drop duplicate instrument=self kwarg; add_parameter already provides it. - _set_temperature_and_state: update cache on self.temperature_setpoint, not the non-existent self.setpoint.
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@microsoft-github-policy-service agree |
jenshnielsen
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May 6, 2026
| ``temperature_setpoint`` cache: | ||
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| - ``block_while_ramping_temperature`` is now created with ``set_cmd=None`` / | ||
| ``get_cmd=None`` so it behaves as a settable cache-only parameter, instead of |
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This file should be named 8097.improved_driver
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #8097 +/- ##
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+ Coverage 70.26% 70.80% +0.53%
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Files 333 302 -31
Lines 32169 31911 -258
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- Hits 22604 22593 -11
+ Misses 9565 9318 -247 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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jenshnielsen
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May 6, 2026
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Thanks @SherwanMicrosoft The changes looks good to me
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Summary
Fixes three bugs in
qcodes.instrument_drivers.QuantumDesign.DynaCoolPPMS.DynaCool.DynaCoolthat prevented the driver from instantiating against a real PPMS DynaCool and
from updating the
temperature_setpointcache after a temperature ramp.Encountered while bringing up an SdH measurement on a Quantum Design PPMS DynaCool
on QCoDeS 0.57.0; all three issues are present on
mainas well.Changes
block_while_ramping_temperatureparameter (~line 84) — created withset_cmd=False/get_cmd=False, which makes the parameter read-only andcauses
add_parameterto reject the suppliedinitial_value=False. Changedto
set_cmd=None/get_cmd=Noneso the parameter behaves as acache-only settable, matching the existing docstring intent
("when set to True, will block further interaction…").
blocking_t_state_check_intervalparameter (~line 93) —add_parameteralready passes
instrument=selfautomatically; the duplicate keyword raiseda
TypeErroron driver construction. Removed._set_temperature_and_statecache update (~line 436) — referencedself.setpoint, which doesn't exist on this class. The correspondingparameter is
self.temperature_setpoint. Fixed.Test plan
Manually instantiated the driver against the real PPMS hardware
(
TCPIP0::10.164.120.28::5000::SOCKET) and exercised:temperature_setpoint(...)round-trip (previously raisedAttributeErrorinside the blocking branch on parameter 3)
No new tests added; these are integration-only paths against vendor hardware.
Newsfragment
Added under
docs/changes/newsfragments/+dynacool-fixes.improved_driver(will be renamed to
<PR-number>.improved_driveronce the PR number isassigned).