See the below Excel file that shows the 6270A outputs that can be recorded during a COMPASS test. Select outputs (quartz sensor, fast sensor, barometer(s), etc.) from a 6270A's PCM and selected PMMs can be logged during a COMPASS test. It should be useful for troubleshooting control/measure problems to a particular sensor in a PMM or PCM.
See this article for a remote command to send to a PM600 module in the 6270A chassis to query its frequency counts.
6270A - Check PM600 module frequency counts in 6270A chassis