H-38-11 Bourns Inc., H-38-11 Datasheet - Page 9

• 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

8
Potentiometers
Wirewound Element Technology
Wirewound elements offer good stability, excellent
linearity, low noise, high power capabilities and good
operational life. Wirewound elements offer a wide
range of resistance values up to 500 kΩ. One
improves as resistance values increase due to the
manufacturing processes whereby smaller diameter
wire and a higher number of turns are utilized. For
applications that may be sensitive to such discrete
steps, care should be taken to select an element with
resolution fine enough to avoid difficulty.
The coil of resistance wire used to fabricate a
wirewound element exhibits an inductive reactance
that increases proportionately with the frequency.
This effect is most noticeable in the lower total
resistance elements where the inductive reactance
can be larger than the resistance, even at frequencies
as low as 20 kHz. The performance of wirewound
elements is also affected by inherent capacitance.
Capacitance exists from turn to turn and also
between the winding and the mandrel. The effects of
capacitance are most significant in the higher total
resistance elements.
Hybritron® Element Technology
This element is a wirewound element with a
conductive plastic coating. It exhibits the
temperature coefficient and resistance stability
similar to a pure wirewound element. In addition, it
displays the long operational life, essentially infinite
resolution and low noise characteristics of the pure
conductive plastic elements.
The combination of the two
provides the major benefits of
both types of elements. This
element is not recommended
in applications requiring high
wiper currents.
primary limitation of wirewound elements
is the finite resolution steps, which
result from the wiper moving from
changes in output.) Resolution
turn to turn perpendicular to the
coil of wire. (These steps are
distinct, sudden, repeatable
Mechanical Cycle Life
Mechanical cycle life is the ability of a potentiometer
to withstand a specified number of cycles under
specific operating conditions, while remaining
within allowable specifications. A mechanical cycle
consists of wiper traverse from one limit of travel to
the other limit, and back. The performance is
determined by the type of resistive element and
wiper used in the construction of the potentiometer.
Precision Potentiometers are generally capable of
mechanical cycle life in the range of 300,000 to
25,000,000 shaft revolutions.
Panel Control Potentiometers are generally capable of
mechanical cycle life in the range of 25,000 to
100,000 full cycles.
Commercial Potentiometers are generally capable of
mechanical cycle life in the range of 10,000 to 25,000
full cycles.
The actual mechanical cycle life or rotational life will
heavily depend on the environmental and electrical
stresses imposed on the unit during its life.
Additional information on performance
characteristics and applications is contained in the
“Application Notes” section of this guide.