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.
Chandos
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.
Chandos
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"?
Tony.
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"?
Tony.
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!
Chandos
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!
Chandos
3.5 MEG, 1 WATT, 1% RESISTOR
http://www.ralphselectronics.com/ProductDetails.aspx?itemnumber=PENN-135000001&source=googleps
http://www.ralphselectronics.com/ProductDetails.aspx?itemnumber=PENN-135000001&source=googleps
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