[Amps] Source for .2% Tol 100 K - 3 Watt MOF EQ resistor's

Jim Thomson Jim.thom at telus.net
Sat Feb 13 05:21:06 PST 2010


Gents

Well  b4 Tony,  W4ZE  passed away, he  gave me the mouser part #   for  superb  100 k  3 watt  mof EQ  resistor's, used across all my lytics  in HV supplies. 

They are rated at 1 % Tol... and come 100 per box.    I bought  3 x box 's  of em.. and all  300 of em measure  EXACTLY  200 ohms  below 100 K  [different lot #'s too] 

IE:  They are ALL .02%  on the low  side.  [ 99,800 ohms]    They are also  50 ppm per deg C  types.... and  have a 500 vdc rating.  Tony found em  buried in the

online  Mouser catalog.  Tony got fed up with  playing..."match-up"  all the time... and wanted  eq resistors   with better tol to start with. 

These ones are superb..,.. just grab em at random.. no need to muck about playing matchup.  We used sta-kon terminals on each end, hole type, not a spade]
and simply crimped em... then soldered em as well.    These are used with  10-32 machine screw  connections used on a lot of  lytics. 

We have also used em on 3900 uf  lytics. that use the larger 1/4-28 machine bolts.    Also used on CD brand lytics, [ 400 series],  that have the pins out the top... in which case the resistor
[and also the RVS connected 6A10 safety diode]  are simply wrapped and soldered. 

 Mouser cat #   CPF-31003FB14  

VISHAY  # CPF3100K00FHB14 

Cust  PN  71-CPF3-F-100K-T2 


The kicker is.... when you measure the DC voltage    across  each individual cap, with a HP  dvm / fluke DVM,  they are all the same dcv !    Be very careful if you do that test.   For test purposes only
I measure just a few of em at the cold end of a string.

Later....... Jim  VE7RF  
  



More information about the Amps mailing list