Kipp & Zonen CSD1, Instruction Manual

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First the resistors at location 2 are removed, and their total resistance is
measured. After this the value of the replacement resistors REP2 can be
calculated according to the following formula:
REP2 = total old resistance * ( 3.3 * REF1 / FD2)
9. REP3 can be treated as REP2. The location of the resistors is 3, RES3.
REP3 = total old resistance * ( 3.3 * REF1 / FD3)
10. It is recommended to check the result of the resistor replacement by
performing a second calibration check.
Recommended resistors:
Type
1206 series ceramic chip, surface mount
Resistance tolerance ± 1 %
Temperature coefficient ± 100 ppm/ºC
Example:
Manufacturer
Bourns
Type Commercial Thin Film Chip Resistor
Series number 1206, Alumina substrate
Resistance tolerance ± 1 %
Temperature coefficient ± 100 ppm/ºC
Power rating 0.3 W