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How to subtract 10 ohms from a 200 ohm resistive load?

HLOW

Jan 24, 2013
12
Joined
Jan 24, 2013
Messages
12
I'm try to calibrate an auxiliary automotive cooling water temp gauge. When I submerse the sensor in boiling water the gauge reads about 90C... The sensor reads about 210 ohms (at 100C). I would like it to be about 200 ohms so the gauge reads correctly. I realize the low end will not be perfectly accurate but I'm not concerned with that.
Thanks for any insight!!!
...
 

duke37

Jan 9, 2011
5,364
Joined
Jan 9, 2011
Messages
5,364
You can put a resistor in parallel
1/A + 1/B = 1/C
so
1/210 + 1/D = 1/200
or
1/D = 1/200 - 1/210
resistor D = 4200
Chose a resistor of the nearest preferred value say 3k9Ω or 4k7Ω
 

HLOW

Jan 24, 2013
12
Joined
Jan 24, 2013
Messages
12
You can put a resistor in parallel
1/A + 1/B = 1/C
so
1/210 + 1/D = 1/200
or
1/D = 1/200 - 1/210
resistor D = 4200
Chose a resistor of the nearest preferred value say 3k9Ω or 4k7Ω
THANK YOU!!!
 
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