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Old 27th February 2012, 12:27 AM   #1
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Default 3.5 megohm 1% resistor source?

Hi, Folks,

Can any one point me in the direction of couple of these. I've got to rebuild the AC/DC probe of a Simpson 311-2 voltmeter, and these are what I find. I've looked in the usual place, Digikey, Mouser, a couple of surplus places, but can't find anything in this value (tho' I may not know how to search correctly).

All suggestions welcome and closely attended to.

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Old 27th February 2012, 12:53 AM   #2
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hi cmbrow, the problem is going to be that 3.5 is not a standard E series resistance value. probably the closest you can get is a 3.48 Meg E192 series (0.1%)

This should be ok as the 1% tolerance of a 3.5 meg resistor would allow it to be in the range 3.465 to 3.535 meg. whereas the tolerance range for a 0.1% 3.48 meg resistor will be in the range 3.477 to 3.483 ohms (you could also use a 3.52 meg also available in the e192 series).

However I've just done a quick search and can't find any 0.1% 3.48Meg resistors (1% yes).

another option may be to use a 1.3M in series with a 2.2M resistor these are available at digikey in 1% tolerance, though I guess that when adding two together you may end up outside the 1% tolerance range. I guess the question is, how critical is the value of these resistors? would a 3.48 1% be "close enough"?

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Old 27th February 2012, 03:12 AM   #3
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Default Thanks!!!!!!

I've placed some 3.48 mOhm Vishays on my Digikey order. The 1% spec is fine for my application.

I much appreciate your quick reply!

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Old 27th February 2012, 08:20 AM   #4
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