PDA-600 Firmware Change Notes PDA-602B / PDA-604A version 2.08 published 10/7/2021 Extended transient_cmd to support the new finite length transient trace. Extended period timer and A/D ISRs to support the new finite length transient trace. Modified holdoff management in 4 pair trace mode to provide the same 1:1 sample relationship as a 2 pair trace. version 2.07 published 3/5/2020 Modified internal relay management to address a new requirement to control non-latching relays (added at a critical path to reduce vulnerabilty when a DUT using a certain FET bridge is connected when the instrument is powered on, after being powered off in the middle of an Rdet margin or Cdet measurement). Changed the control pattern used when connecting the constant current source to the PI, to further reduce the voltage that can be present due to stored charge. version 2.06 published 9/10/2019 Corrected an issue with max current available when using a slow slew rate voltage turn on while the instrument is configured for 4-pair operation. Full current was available on Alt A, but only 50% on Alt B. (only affected class 8 device testing) Added use of onboard loads to bleed the PI down below 2.8VDC to ensure that the PD has performed a class reset prior to starting the Rdet margin measurement. Corrected a timing issue discovered with certain instruments where an A/D was taking longer than expected to complete a measurement, causing an error and a -1 Rdet margin value to be reported. version 2.05 published 3/05/2019 Modified MeasClass to assert Vmark for 1 event class (corrects behavior to faithfully implement the Type3/4 PSE state diagram (CLASS_EV1_LCE to MARK_EV_LAST). Corrected sample alignment issue discovered with transient triggered trace when instrument configured for 4 pair operation. version 2.04 published 10/17/2018 Changed front end configuration management when performing Rdet unpwr to prevent an issue that was discovered when instrument used with PDs with certain MOSFET bridge implementations, where a relay was potentially exposed to currents well above rated limit. version 2.03 published 9/07/2018 Added missing average calculation in parallel detection code block (only used when a Dual sig discovered). Corrected LOW to HIGH range change in StimulusTask for ramp. version 2.02 published 2/02/2018 Added initial support for 4 pair operation (meters, source control). version 2.01 not published version 2.00 published 10/25/2017 Initial Release supporting HW version 2 boards. PDA-602A version 1.09 published 19/17/2018 Changed front end configuration management when performing Rdet unpwr to prevent an issue that was discovered when instrument used with PDs with certain MOSFET bridge implementations, where a relay was potentially exposed to currents well above rated limit. version 1.08 not published Corrected LOW to HIGH range change in StimulusTask for ramp. Removed unecessary delay from MeasClass for non-default mark2 width. version 1.07 published 9/22/2017 Added state in MeasClass to ensure that Vport < Vreset_th min for > 15ms under all load conditions (down to min Imark), with VSENSE connected. version 1.06 published 5/18/2017 Modified source STIMULUS_TURN_VPORT_ON case to maintain Vclass as power is turned on for 1 event class, delay = 0 settings (prevent a voltage dip that caused some 802.3at PD controllers to incorrectly latch a falling edge). version 1.05 published 9/09/2016 Additional extensions to trace meter ISR to support trigger on a current level, implemented a circular buffer sample accumulator (implementation of transient triggered trace meter). version 1.04 not published version 1.03 published 6/13/2016 Added support for defining different dwell times for voltage ramp. version 1.02 published 2/08/2016 Corrected data pattern dependent error in the 0.2ms period setting. version 1.01 published 2/26/2016 Added composite query that returns multiple instrument settings in a single query reponse (support GUI update speed improvement). version 1.00 published 2/22/2016 Initial Release.