Rigol DG1062Z drives OUT on 10 MHz reference input

[n0jcf]

I've been burned a couple times now by this DG1062Z "feature" of driving it's 10 MHz reference clock OUT the reference input BNC whenever the external reference goes away.  I've configured the unit to use external reference but after a couple hiccups in the lab where the house 10 MHz signal went to zero (power cut on the distribution amplifier), I discovered that the Rigol had failed over to outputting it's 10 MHz internal reference back into the house standard.  What's worse is that the Rigol saves this config, overriding the previous saved config for external reference.  So even if you power cycle the Rigol, now it will not come back up using external reference.  It uses the internal reference and drives that outward on the reference BNC until you go back through the menus and re-configure for external reference.  Yuck.

Has anyone invented a mod to disable the ability of this unit to drive outward on the 10 MHz reference connector?   I would never use this instrument as a reference source so I am fine if it fails over to internal reference but I do not want it driving that back out into the house standard and screwing up a bunch of stuff.   I think I could accomplish this with a strategic trace cut or two so I am wondering if someone has already gone down this path?

I've also written to Rigol asking if this is an oversight and something they could fix in firmware (ie, don't override my choice of external reference and SAVE that; just keep using the external reference even if it goes to zero briefly).  But-- I'm not too hopeful that would be something they would fix on this no longer bleeding edge instrument.

Chris

[bson]

The Siglent SDG2042X had the same problem when released.  Siglent fixed it with a firmware update where if set up for ext ref it sticks with it even if the ref goes away or the instrument is rebooted, but as I recall it took a while...  Auto behavior is totally undesirable.