According the motor or power tool which will be tested, We suggest the chosen dynamometer is usually as two times as motor or power tool's rated torque.
For example: a motor with power-in 120W, speed 1450r/min ( rated)
Find the dynamometer in the CC Hysteresis Dynamometers list, choose the one whose maximuim torque is a little larger than 1.6N.m. The closest specificaion is 2N.m, so we choose CC20K.
AG38 controller can be used for all dynamometers, But
one dynamometer can not suit for all kinds of moter test .Customers should classify their products based on specifications and choose each dynamometer for each class(maybe include several products). At the same time, the speed and powerin of tested motor should not overstep the limit of dynamomter's permission.