The service manual is out there but just in case someone knows of a source
for an operators, preferably for the DSA524. There is apparently a paid-for
sourxe which I may go for.
There are 58 buttons on this unit, for a start significance of the grey and
blue buttons and the specs for ext trigger.
Just pointers to, please, no large files sent to any email accounts of mine
divulged on the www should anyone have a pdf etc , they will be rejected

nothing that far back on the support part of
http://www.tti-test.com