By analysing the operating condition of space point measurement of IF strong magnetic field and computing the error of signal processing circuits

it finds out the major factors leading to errors. In order to improve the accuracy of the measuring instrument

real time property and anti-interference ability

an optimization method of combining hardware and software is presented. In the signal regulating circuit

the errors were significantly reduced by reasonably configuring the amplification factors of pre and post stage

relative resistor and using high-precision operational amplifier. Interference was suppressed effectively by employing two hardware and uniquely mean filtering methods. Via the use of the least square method to optimize data fitting parameters

errors caused by rectifier

filter and programmable amplifier circuit were reduced further

which improved the whole performance. The experimental results obtained by testing the optimized measuring instrument

show that measurement error is less than ±1.5%

consistency error is less than 1%

and real time property of measurement is also improved

which demonstrates the excellent effects.