The transfluxor as an accurate analog magnetic memory

The transfluxor can serve as the analog storage element which is needed to couple the digital process control computer to the analog process. It stores an analog command in a few milliseconds, and the value is sensed nondestructively for an indefinitely long period. In this system, a closed loop is used to set the analog level, with proportional and integral compensation to modulate the size of setting pulses. The accuracy obtained is typically 0.1 percent at all scale positions in a time of 20 ms. The characteristics of the transfluxor which make setting accuracy difficult are its variable gain, variable time lag in response to a series of equal pulses, dead zone with a spurious output, and slow magnetic anomaly effect.