Tektronix 434 s/n below 500000 faulty ps.

[johnmcgivern]

Craig I measured my Fluke to be 8.4Meg not 10meg.
What would cause this.
Measured old 9volt battery to check ratio. With Dmm alone measured 6.78v.
Using Hv probe setup battery measured 1.6mV.
4237.5:1 double checked same result.