简述：
the pressure or flow rate by slow up-down pattern
A slow up-down signal generator and the functions of a DC
and the command signals are given by relay contacts,
limit switches, timer contacts, etc.
input type are incorporated. This is used to control
and models on available for a variety of applications.
These are power amplifiers to be used exclusively to operate
the electro-hydraulic proportional valves. Various type
特点：
The power amplifiers should be kept away from hot and humid conditions
They also should be installed in the clean and dry place where the vibration is minimal.
standard setting adjusters for general use and designs
The setting adjuster supplies the command signal voltage to the power amplifier.
or get them enclosed totally as they need to radiate the heat
from semiconductors or ICs inside. Please use shielded wires for input signal
which may deteriorate some components of t he power amplifiers.
Please avoid to install the power amplifiers in the complete enclosure
transmission to prevent the amplifiers from any interference such as noise from outside.
and manufactures special setting adjusters to order:
Since the setting adjuster is closely related to actual machine operating procedure,
the user generally provides this device. Yuken makes the following
