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Patent 4136508: Closed-loop combine header height control Known header height controls have a "deadband" within which the control is disabled when header height is between the raise and lower deadband limits at which the height sensors actuate the electrohydraulic power means to respectively raise and lower the header, and some controls also have means to vary the width of such deadband. 5 is a diagrammatic illustration of deadband in the disclosed embodiment of the invention. Deadband adjusting potentiometer DB, which is accessible at the operator's platform, permits variation of gain of summing amplifier SA and thus establishes the "rate" at which error voltage C varies for a unit height error, i.e., a unit deviation of measured header height from height setpoint. www.freepatentsonline.com /4136508.html   (5134 words)

Deadband - Wikipedia, the free encyclopedia Deadband is an area of a signal range or band where no action occurs (the system is dead). Deadband is used in voltage regulators, thermostats, and alarms. In some substations there are regulators that keep the voltage within certain predetermined limits, but there is a range of voltage in-between during which no changes are made, such as, maybe, between 112 to 118 volts (deadband is 6 volts here), or 215 to 225 volts (deadband is 10 volts here). en.wikipedia.org /wiki/Deadband   (142 words)

DOPPLER DF INSTRUMENTS/TDOA_DETAILS Within the deadband, audio should be present in BOTH earpieces, at full strength. At one end of the adjustment range for the DEADBAND trimpot, the deadband should have zero, or nearly zero width. The deadband adjust trimpot can be set for any convenient level, usually around 30 to 50 degrees of headset rotation, to exceed the deadband. www.silcom.com /~pelican2/TD_DETAILS.html   (885 words)

ITT Aerospace Controls Deadband, 5 psi or 10%, whichever is greater, to 45% of the set point. Deadband, 2 psi or 15%, whichever is greater, to 45% of the set point. Deadband, 5 psi or 8%, whichever is greater, to 45% of the set point. www.ittaerospace.com /scripts/products/index.asp?p=Switches   (1230 words)

Patent 4509110: Method and apparatus for detecting failures in a control system Error signals exceeding a predetermined minimum value or deadband are integrated; but the integral is reset to zero whenever the error signal value falls within a predetermined range indicative of normal steady state operating tolerances. The deadband allows the integrator to ignore errors up to a value which is considered likely to be the result of normal behavior rather than a fault in the system. This is advantageous since small error levels outside of the deadband are less likely to be the result of a fault or impending failure in the control system 12 than are large error levels and can, in any event, be tolerated for longer periods of time. www.freepatentsonline.com /4509110.html   (2574 words)

Deadband in switches?   (Site not responding. Last check: 2007-10-14) Deadband is also known as hysteresis and is the amount of a measured variable (pressure, temperature, etc.) between the point where a switch closes and then re-opens. Often the deadband of a switch is fixed and cannot be adjusted. Selection of deadband depends on the process under control, it may be fixed or adjustable. www.control.com /1026202975/index_html   (557 words)

Patent 4195350: Method and apparatus for eliminating deadband in digital recursive filters The deadband inherent in a recursive filter operating according to Equation (2) will be apparent from the following Table I, which for clarity has been set forth in decimal fashion rather than binary. 4,064,530, deadband due to rounding causes artifacts to appear in the displayed television image, known in the art as the "ground glass" effect. Unlike the exponential characteristic of a true integrator, however, where the increments with time become diminishingly small, the present algorithm is linear in that it continues to add or subtract one least significant bit until the difference between x' (also y) and x vanishes. www.freepatentsonline.com /4195350.html   (2829 words)

UIltra-Maneuverable Steering Control Algorithms for Terrain Transitions   (Site not responding. Last check: 2007-10-14) The nonlinear input/output relationship is simply modeled as a torque deadband with a linear input/output relationship outside of the deadband and a linearly variable viscous damping term. The value of J can then be found using by solving Equation 1 for J. The torque deadband for each running surface is measured by placing the wheel on the running surface, applying an increasing voltage to the motor input, and measuring the value of the input voltage when steering motor motion is just detected. The torque deadband had the predicted effect of leaving a non-zero command voltage on the motor input due to the small steady state angular error and the high system gain. www.autonomoussolutions.com /research/press/SPIEControls.html   (4232 words)

Eurotherm Action Instruments - Q116 - RTD Input Limit Alarm The deadband, or hysteresis, level is input next and is stored with another press of the button. Deadband "A": For minimum deadband (0.25% approx.), press and hold the CAL button for 4 seconds. Deadband "B": For minimum deadband (0.25% approx.), press and hold the CAL button for 4 seconds. www.actionio.com /products/actioniq/ac/q116_spec.html   (1188 words)

DOPPLER DF INSTRUMENTS/TDOA_INTRO DEADBAND sensitivity to audio level changes was fairly smooth, and proved to be a useful way to "adjust" the DEADBAND width, during the test.... once the initial adjustment of the DEADBAND trimpot was completed, it was found that audio level changes of 15 to 20 db would change the DEADBAND size from 360 degrees to zero, in a fairly smooth and useful manner. This might have been due to a DEADBAND zone that was adjusted to be excessively narrow, but there was a lot of activity going on at the moment, and I did not investigate it closely. www.silcom.com /~pelican2/TD_INTRO.html   (1678 words)

[No title] The deadband was increased from “2” to “7,” and the inequality signs () of the lower two if...then statements were swapped. Deadband is often a problem in navigation control systems. The result is that deadband is the area you don’t know about and try to develop creative ways of dealing with it. www.engineering-ed.org /robo-ed_programming/documents/Week6_Monday/Week6_Monday-LineFollowingIntroduction.doc   (835 words)

Mercoid Series DA Bourdon Tube Pressure Switches Deadband, or the difference between set and reset points is adjustable over the full scale. Switch shall have deadband fixed or adjustable up to a maximum of 100% of switch range. However since they are available in a variety of functions, a second letter is added to D to define the type of deadband and/or adjustment. www.nciweb.net /series3.htm   (666 words)

Control system - Wikipedia, the free encyclopedia Most real feedback loops are concerned about wearing out control machinery like valves, by adjusting them many times per second. Therefore, they often have a "deadband," a region around the current value in which no control action occurs. Another common method is to filter the feedback loop. en.wikipedia.org /wiki/Control_system   (1321 words)

Deadbands and Scaling with Memory Tags in LabVIEW DSC - KnowledgeBase - Support - National Instruments The update deadband is applied to the memory tag to determine which values are actually logged to the tag. Values that don’t have a higher change than the specified deadband won’t be logged to the tag. The alarm deadband will also be applied to the memory tag to determine the tag’s status. digital.ni.com /public.nsf/allkb/047F3A7E9882461886256F890073BDD4   (405 words)

:: rcZone :: - Digital FET Servos   (Site not responding. Last check: 2007-10-14) Where a digital servo differs, is in the way it processes the incoming receiver information, and in turn controls the initial power to the servomotor, reducing the deadband, increasing the resolution and generating tremendous holding power. This also means that not only does the servomotor respond faster to the commands, but that increases or decreases in power for acceleration/deceleration are able to be transmitted to the servomotor far more frequently. This is a comparison graph showing the deadband between two Futaba servos with the same specifications. www.rczone.net /modules.php?name=News&file=print&sid=308   (917 words)

Bourdon Tube Operated Pressure Switch - Series DA-DS   (Site not responding. Last check: 2007-10-14) Deadband, the difference between high and low setpoints, is adjustable over the full scale. The deadband is fixed at a factory setting and cannot be altered in the field. Other Options: DPDT switches or other switch types, fixed deadband mercury switch units for low deadband applications, manual reset operation, two-stage operation, Delrin bushed movement for applications with high amounts of vibration and/or pulsation, fungus proofing, siphon, diaphragm seals, mounting flange and remote connection. www.cyvsa.com.mx /Product.asp?Param1=Series+DA%2DDS&Param2=24   (416 words)

Modern Control Valve Response   (Site not responding. Last check: 2007-10-14) The deadband is the range through which an input signal to a device may be varied, with reversal of direction, without initiating an observable change in the device. The control valve deadband sets the amplitude of the deadband cycle and the instantaneous error in flow rate. That is, a valve at 50 percent open has twice the effective stem deadband as the same valve 100 percent open. www.flowcontrolnetwork.com /PastIssues/feb2002/4.asp   (1329 words)

Digital Servo Guide - RC Car Action.   (Site not responding. Last check: 2007-10-14) They also produce constant torque throughout their range of travel and have noticeably increased holding power when in a stationary position (this helps to keep even the biggest monster truck tires in line while you’re steering through a high-speed turn). "Deadband" is the degree to which the servo’s shaft must be deflected from its current position before the servo responds to correct it. And because the servo position is updated so frequently (300 times a second is typical; 50 or 60 times a second in an analog servo), a digital servo can hold its position more forcefully, which is the holding power. www.rccaraction.com /articles/digital_servo.asp   (457 words)

Stardust | JPL | NASA One of the on-going activities is the analysis to determine the cause of the multiple firings that are occasionally seen when the spacecraft's attitude reaches the edge of the deadband, or the edge of the region through which the spacecraft can drift without correcting itself. A typical deadband used for communicating with the spacecraft is 4 degrees in the X, Y and Z-axes and the spacecraft commonly moves through the deadband at a rate of less than 0.02 degrees/second. When the spacecraft's attitude hits the edge of the deadband, commands are automatically issued to the thrusters to move the spacecraft toward the other side of the deadband. stardust.jpl.nasa.gov /news/status/010216.html   (278 words)

All News Archive The deadband is maintained at +/- 1 km between 30 and 50 degrees north and is guaranteed to be within +/- 2 km for the whole orbit. The deadband can be guaranteed to be within +/- 2 km for the whole orbit for the next couple of months, but will slowly degrade until out of plane manoeuvres are possible in monogyro. Despite the improved deadband of +/- 2 km, which will improve the chances of having pairs with a suitable baseline for interferometric applications, the remaining level of yaw mispointing is still too large at this point in time for such applications. earth.esa.int /cgi-bin/news_archive?1997   (13660 words)

SA03xy Serial Analog Input Mouse Controller The deadband is a fixed value of 15% of range above 2.3 volts on the deadband input. For example the SA03RD moves the cursor Right on a voltage higher than the deadband on the X axis and Down on a voltage higher than the deadband on the Y axis. Cursor speed is proportional to the deviation from the deadband. members.aol.com /swftec/sa03xy.htm   (716 words)

Data Path from Transducers to LabVIEW DSC Tags to Citadel - KnowledgeBase - Support - National Instruments The OPC (or I/O group) deadband is applied to determine which data points from the hardware are logged in the OPC. The update deadband is applied to determine which OPC data points are logged to the LV DSC tags. The alarm deadband is applied to the data from the OPC to determine the status of the tags. digital.ni.com /public.nsf/allkb/67A99E6ED399058C86256F8900740D6A   (287 words)

LS3000 Calibration Procedure Turn the deadband ff I pot CCW until the LED goes OFF. Note: This is the higher of the two levels when using the deadband. If not using deadbands at all then you are done. www.pdblowers.com /LS3000%20Calibration%20Procedure.htm   (415 words)

Diaphragm Operated Pressure Switch - Series SA1100.gif   (Site not responding. Last check: 2007-10-14) This results in a minimum deadband as low as 5% of full scale. A pump being used to control liquid level in a tank would be a typical situation where this feature would be important. Both setpoint and deadband adjustments are protected, yet clearly visible behind a clear polycarbonate window and are fully isolated from the electrical components for additional safety. www.cyvsa.com.mx /Product.asp?Param1=Series+SA1100&Param2=24   (250 words)

Testimony of Marvin Kahn on Policy Considerations for PBR Mechanism   (Site not responding. Last check: 2007-10-14) A deadband should be sufficiently large so that random variations or measurement error do not trigger earnings sharing, thus promoting rate stability. The profit-sharing mechanism was modified so that shareholders retain 100% of the excess earnings within a deadband about the benchmark ROE (50 basis points in the first year, 100 basis points in the next two years). A deadband of 6 minutes and a rolling 2-year average for performance measures is adopted to accommodate the year-to-year statistical variability; thus no penalties will be imposed or rewards will be received until after the second year. www.ucan.org /law_policy/energydocs/policy.html   (17143 words)

midsouthcable.com, pressure, switch, switches, deadband, dead, band, adjustable, open, frame, beryllium, copper, ... Ideal for jockey pumps, air compress, and fire pumps, the model ADPS is an Adjustable Deadband Pressure Switch with independent set and reset points which are adjustable throughout the entire operating range of the switch. The minimum deadband (minimum span between set and reset points) may be obtained at any point in the operating range of the switch. The model ADPS is an Adjustable Deadband Pressure Switch with independent set and reset points which are adjustable throughout the entire operating range of the switch. www.midsouthcable.com /PotterIndustrial.htm   (960 words)

[No title] A deadband refers to an area around the set course within which deviations are tolerated and do not produce any steering response. The function of the deadband is to allow the boat to come back to course by itself and so to conserve power and prevent over steering. The term "gain" refers to the amount and speed of the rudder movements induced by the pilot and can also be adjusted to fit the existing conditions. www.selfsteer.com /windvanes101/autopilots.php   (392 words)

Eurotherm Action Instruments - Q106 - DC Input, Field Configurable Limit Alarm The Q106 is equipped with two SPDT (form C) relays, rated at 120VAC or 28VDC at 5 amperes. In failsafe operation, the relay is energized when the process is below the HI setpoint or above the LO setpoint (opposite for non-failsafe). Check the setpoint and deadband to validate calibration.ployed by a growing number of advanced users. www.actionio.com /products/actioniq/ac/q106_spec.html   (1071 words)

Pressure Switch by Plast-O-Matic Because of hysteresis (also known as "deadband"), the reversal will occur at approximately 40% lower pressure. Deadband helps to prevent oscillation or "hunting." In other words, without sufficient deadband, the switch will be actuating and de-actuating too often. For applications where it is critical to de-actuate with less deadband, a 3-amp switch is available. www.plastomatic.com /swt.html   (629 words)

Lesman Instrument Company Max Pressures 20 PSI to 29 PSI   (Site not responding. Last check: 2007-10-14) Deadband: 1 to 4 PSI, Proof Pressure: 1000 PSI, Overrange Pressure: 500 PSI Deadband: 0.1 to 3 PSI, Proof Pressure: 1000 PSI, Overrange Pressure: 500 PSI Deadband: 0.3 to 5 PSI, Proof Pressure: 1000 PSI, Overrange Pressure: 500 PSI www.lesman.com /acatalog/Online_Catalog_Max_Pressures_20_PSI_to_29_PSI_1526.html   (202 words)

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