I'm not sure of the required power spec,  but 28V may be too low.  These were 
meant to run off a telco power bus (nominal 48V).  
I run mine at 40V (from a Tek PS503A mounted in a TM501 mainframe,  unit 
connected across the + and - supply terminals,  outputs set to +/- 20V).  It 
won't run at 28V.

----------------
Input  voltage to the poor performing unit is about 28VDC. 
                                          
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