H-38-11 Bourns Inc., H-38-11 Datasheet - Page 31

• Manufacturer Part Number: H-38-11
• Description: HDWR NUT MOUNTING FOR ECW ENCODR
• Manufacturer: Bourns Inc.
• Type: Mounting Nutr
• Series: Hr

Specifications of H-38-11

• Mounting Hole Size: 9 mm
• Features: Hardware indicated by shaded area is normally supplied with unit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ECW1DB24BC0024 - ENCODER DIGITAL CONT 24 CPRECW1JB24BC0024 - ENCODER DIGITAL CONT 24 CPR
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

30
Application Notes
Potentiometers
Typical Applications and Circuit Configurations
The following section will familiarize you with the
two basic ways in which a potentiometer is applied
in a circuit: voltage divider mode and rheostat mode.
Voltage Divider Mode
A resistive voltage divider provides an output voltage
in reduced proportion to the voltage applied to its
input. In its simplest form, it consists of two
resistances in series. The input voltage is applied
across the total circuit and the output voltage is
developed across one of the individual resistances. A
potentiometer can act as a variable voltage divider
with the resistive element substituted for the two
resistances. The wiper provides an adjustable output
voltage. The basic variable voltage divider circuit is
shown in Figure 4. An input voltage is applied across
the entire resistive element. The output voltage is
developed across the lower portion of the element
between the wiper and one end of the resistive
element.
Figure 4: Voltage Divider Circuit
Rheostat Mode
Many applications use the variable resistance
between the wiper and one end terminal as a method
of current adjustment. This two terminal method of
connection is frequently referred to as the rheostat
mode. Figure 5 illustrates the basic rheostat circuit.
The choice of input and output terminals is arbitrary
since the potentiometer, when applied as a current
control, is a two-terminal device.
Figure 5: Rheostat Circuit
CAUTION: CONDUCTIVE PLASTIC AND
HYBRITRON® ELEMENTS SHOULD BE APPLIED
IN VOLTAGE DIVIDER CIRCUITS ONLY.
Some typical applications for precision
potentiometers are listed below along with circuit
configurations and application details.
Closed-Loop Servo
As a remote shaft position control, the operator
moves the panel control to calibrated setting for
desired shaft position. The servo potentiometer
moves with the panel control shaft to the new
balance setting. The input may also be some other
signal or sensing device. The motion may be rotary
or translatory. Examples are servo-driven meter
replacing sensitive D’Arsonval movement, X-Y
plotter drives, control surfaces, etc. See Figure 6.
Figure 6: Closed-Loop Servo Circuit