Precision Measurement Engineering, Inc.

Discussing the Hardware

GRADIENT CHANNELS

There are several gradient channels within the SCAMP. The actual number depends upon the options purchased and can be as many as 8. All are identical. They are analog signal processors that first compute 0.2 times the time derivative of the voltage supplied to the circuit, then amplify by a programmable gain given by:

G = 256/NGAIN

where

G - circuit gain block gain Volt/Volt

NGAIN - gain integer 1 to 255

then filter the output.

These two graphs show the frequency response and step response, while this graph shows the ramp response for a gradient channel with gain of 1. The circuits are located on the 5267 Dual Gradient & Filter circuit boards, two complete circuits to a board.