[R-390] Correcting for meter sensitivities?

[R390rcvr@aol.com]

Dear List Mavens:

Is there a simple correction factor or formula that will allow you to correct 
for the use of multimeters with different ohms per volt sensitivities?  Some 
of the older data sheets have test voltages listed, using a 1k ohm/volt 
meter.  Others with 20K ohm/volt, etc.  I realize that the discrepancies vary 
with the level of voltage measured, but wonder is there is a straight forward 
way to correct readings when you don't have the specified meter.  In 
particular, I need a 1K ohm/volt meter, but all mine are 20K ohm/volt or 
higher.  I tried to find a new meter with that sensitivity, but not luck. 
Even the cheapest radio shack was 2K ohm/volt. Also, what about DMMs?

Thanks

Randy