HMR4007
SENSOR PRODUCTS
Linear Position Sensor
User’s Guide
Solid State Electronics Center
•
www.magneticsensors.com
(800) 323-8295
Page 1
Страница 1: ...HMR4007 SENSOR PRODUCTS HMR4007 Linear Position Sensor User s Guide Solid State Electronics Center www magneticsensors com 800 323 8295 Page 1 ...
Страница 2: ...eering units the reported position is divided by 4095 and then multiplied by the span of the sensors 69 7mm or 2 75 If we call the reported position x then the position in engineering units would be N 0 5 1 5 moving object stationary sensor card Position in mm x 4095 69 6 Position in inches x 4095 2 75 The above example shows a magnet oriented in what is called the radial mode where the magnetic p...
Страница 3: ...0 1 spacing Analog Interface Analog Output D A output 0 2 5 VDC Update Rate 10 30 Hz Signaling Level TTL levels 1 0 3 5 0 3 5 0 1 5 VDC VDC Connector In Line 4 Pin Block 0 1 spacing Physical Dimensions Circuit Board Assembly including connectors 40 0 x 80 0 x 12 0 mm Weight HMR4007 16 5 grams Environment Temperature Operating Storage 40 55 70 125 C Note 1 The standoff distance between the sensor b...
Страница 4: ...ached to the moving part of a device under test These sensors are supplied power by a constant voltage source and the use of an array of sensors helps to maintain accuracy over temperature and run out The sensor outputs are routed to a multiplexed Analog to Digital Converter ADC integrated circuit A microcontroller integrated circuit periodically queries the multiplexed ADC and performs sensor off...
Страница 5: ... Bit x Sensor Board J2 pin uP pin function 1 Vcc power input 5 28VDC 2 RA4 status TTL output Logic 0 output not valid Logic 1 output valid 3 D A Output analog output 0 2 25V 4 GND power ground x x Not used leave all OPEN 4 40NF mounting holes connected to ground plane USB port not used Sensed axis x x x x 1 2 3 JP1 W here 1 J3 USB 2 J2 Analogoutput 3 J1 digitalcommunications shownabove Figure 1 Se...
Страница 6: ...put J2 pin 3 represents the position of the magnet along the long axis of the sensor board as seen in Figure 2 below In the given example the center of the magnet lies between sensors 3 and 4 The resulting output voltage is 1 20 volts which corresponds to a position of 33 4 mm N S 0 0 1 25 2 50 O utput volts D C 34 8 69 6 position mm 1 20 vdc 33 4 m m Figure 2 Position sensing example An effort sh...
Страница 7: ...ts operation HMR4007 dll is a dynamic link library that performs low level communications between the host PC s parallel port and the sensor board to query the current measured position and support operating mode changes Several functions are visible to the user using the following Visual Basic header formats Declare Function InitPort Lib HMR4007 dll ByVal ADD As Integer ByVal TOut As Long As Inte...
Страница 8: ...terial a magnet has two dimensions to consider its physical material length and its apparent magnetic length The heart of the HMR4007 is Honeywell s HMR1501 magnetoresistive MR sensor that responds to the angle between the chips sensitive axis and the magnetic field The HMR1501 has a maximum response when this angle is 45 degrees We can therefore define the magnet s apparent length as the distance...
